Open-issue triage: reproduction evidence and draft fixes (2026-09-11)

# Open-issue reproduction and fix tracker

Snapshot: **2026-09-11**, **68 open issues**, baseline `c472d6f` (`master`).

Triage covers issue bodies, available comments, current source and existing PRs. **“Unverified” is not “not reproducible.”** Static evidence and reporter evidence are distinguished from tests executed here. Runtime environment: Linux, mpv 0.41.0, mpv-linked FFmpeg 9.0.1 and FFmpeg CLI 8.1; Windows/macOS and AMD/NVIDIA hardware reports require their respective environments.

Draft fixes are linked below after reviewing before/after regression evidence. No issues are closed by this triage. Existing log-cleanup PR #211 is tracked rather than duplicated.

## Draft PRs

| Draft PR | Issue | Change |
|---|---|---|
| #218 | #139 | Add 10 fps to the options menu |
| #219 | #157 | Skip incompatible x264/x265 constant-quality two-pass |
| #220 | #172 | Render GIF subtitles before palette generation |
| #221 | #140 | Include right/bottom edges in crop selection |
| #222 | #163; related #135/#188/#202/#77 | Document executable PATH and codec requirements |
| #223 | #48 (partial) | Use correct video/audio strict min/max bitrate |
| #224 | #156 | Honor disabled current filters for color adjustments |
| #225 | #167 | Support numbered output filenames and collision checks |

All eight initial draft PRs passed GitHub build and test checks. #219 has since been narrowed to x264/x265; its five focused regressions pass. See the PRs for current CI status.

## Issue-by-issue status

| Issue | Reproduction status | Fixability / disposition | Evidence / next step |
|---|---|---|---|
| #208 — how to always delete x264_2pass.log.mbtree and x264_2pass.log | Reported / static | Existing PR | Log cleanup already covered by #211; review that PR rather than duplicate it. |
| #205 — Output Template, Property Expansion | Unverified | Needs focused reproduction | Property-expansion support question; validate nested syntax and current mpv expression support. |
| #203 — Cannot find the cut clip file after crop/encode: is it working? | Unverified | Needs reproduction / diagnosis | Windows report has no encoder log or resulting path. Request verbose log, webm.conf and output-directory writability. |
| #202 — Can Webm used in IINA, are there other convenient methods for video editing? | Environment / support | Packaging / docs | mpv-linked libavcodec must include requested encoders. Installing a separate ffmpeg does not establish mpv codec availability. Documentation improvement in #222; environment issue remains separate. |
| #199 — Cropping video not working, but can preview with crop | Unverified | Needs reproduction / diagnosis | Preview crop reportedly works but encoded NVENC/WebM output does not. Need current log, saved region and source sample before choosing a filter fix. |
| #198 — Quality settings do nothing | Unverified | Needs reproduction / diagnosis | Compare resolved CRF/target_filesize/strict settings and output bitrate on one source; report lacks a verified cause. |
| #197 — Any way to preserve video effects in output clip? (Speed, Pitch, ect.) | Feature / partial support | Needs precise effect requirements | Current code forwards playback speed and selected vf; not every playback effect is preserved. |
| #195 — Encoding occasionally stuck at 0% and never finishes | Unverified / intermittent | Needs lifecycle investigation | Progress reader is synchronous; streaming stall/cancellation reports need a live reproduction. Related #132. |
| #188 — Encode fails when MP4 or MP3 codes are selected on MacOS | Environment / support | Packaging / docs | mpv-linked libavcodec must include requested encoders. Installing a separate ffmpeg does not establish mpv codec availability. Documentation improvement in #222; environment issue remains separate. |
| #187 — Encode fails if source video file is located on a NAS and display_progress=yes | Platform-blocked | Needs Windows validation | Progress shell/quoting or two-pass path report; cannot establish root cause from Linux alone. |
| #186 — del | Empty report | No actionable fix | No body or reproduction steps. |
| #185 — Subtitles are missing when watching the preview | Unverified | Needs reproduction / diagnosis | One-line preview subtitle report: need selected track, sub-visibility, style/config and a subtitle sample. |
| #182 — active fork or alternative | Support / maintenance | No defect established | Discussion of forks and existing capabilities. |
| #172 — There are no subtitles in the generated GIF | Reproduced on baseline | Draft PR #220 | SRT/ASS decoded-frame checks fail baseline, pass fix across both dither modes; parent verified. |
| #171 — webm conversion fails when going from 4:2:2 to 4:2:0 subsampling | Unverified | Needs reproduction / diagnosis | Old mpv 0.35 crop/autoconvert assertion for yuv422p→yuv420p. Retest current mpv with exact dimensions/source before treating as script defect. |
| #168 — [Request] Update the FFMPEG branch to contain the new features | Feature request | Requires branch maintenance | Request to update legacy FFmpeg branch, not a reproduced defect. |
| #167 — %04n output_template naming | Reproduced on baseline | Draft PR #225 | Three real-mpv tests fail baseline and pass fix: sequential counters, collision/gap reuse and literal source names; existing output bytes preserved. |
| #166 — Slightly off colors in generated webm | Unverified | Needs reproduction / diagnosis | Color screenshots do not establish conversion error. Need source color metadata and measured output; inspect VP8 colormatrix conversion. |
| #165 — [Request] Apply GLSL shaders to output | Feature request | Requires rendering design | GLSL playback shaders are not ordinary encoding vf filters; forwarding flags alone is not a verified solution. |
| #163 — coding error when displaying progress (revision of the installation instructions) | Documentation gap confirmed | Draft PR #222 | Documents Windows/macOS/Linux PATH and mpv codec requirements; platform setup steps not newly executed. |
| #161 — [Request] Encode speed option | Feature request | Needs option design | Per-codec encoding-speed/preset settings requested. |
| #160 — Crop error on videos containing landscape-rotated iOS screen recordings | Unverified; sample supplied | Needs rotation reproduction | Use linked iOS sample; investigate displayed crop coordinates versus encoded orientation. |
| #158 — add hevc_amf and h264_amf encoding profiles | Feature / hardware-specific | Needs AMD hardware validation | AMF profiles and bitrate behavior need codec-specific settings and hardware tests. |
| #157 — error when selecting (h264/AAC), twopass=yes and target_filesize=0 | Reproduced on baseline | Draft PR #219 | x264/x265 constant-quality second passes fail. Codec-specific guard passes five real-encode checks and preserves VP8/AV1 and bitrate-targeted x264 two-pass behavior. |
| #156 — Contrast and Saturation are kept when "Apply Current Video Filters: no" is set | Reproduced through real mpv output | Draft PR #224 | Real encodes verify disabled adjustments equal neutral pixels and enabled adjustments differ; fails baseline, passes fix. |
| #155 — When using MP4 (h264/AAC) preset, first few frames are always gray and corrupted | Unverified | Needs reproduction / diagnosis | Initial gray/corrupt MP4 frames: need reproducible source/trim timestamps and decoded GOP analysis. |
| #154 — Failed to encode ani-cli output | Unverified | Needs reproduction / diagnosis | ani-cli-specific URL report while local/YouTube worked; requires current resolved URL and verbose log. |
| #153 — Issues with HLS stream Webm Encoding | Unverified | Needs reproduction / diagnosis | HLS/Streamlink reports include a later --no-config reproduction and log attachment; current cache-dump/live-stream behavior needs a live retest. |
| #152 — WebM audio of encoded clip is always much lower than the original audio | Unverified | Needs reproduction / diagnosis | Reported ~50% lower WebM loudness. Need measured source/output loudness, channel layout and replaygain/volume settings; bitrate alone does not establish cause. |
| #149 — dolby vision to sdr with the right colors | Feature request | Needs color pipeline validation | HDR/Dolby Vision to SDR; #94 comments provide libplacebo workaround, not a universal validated conversion. |
| #147 — Stupid question about key remapping | Feature / support | Bounded config enhancement | Crop-key remapping workaround confirmed in comments; configurable crop binding remains requested. |
| #146 — Progress Bar for Encode Process | Unverified / intermittent | Needs lifecycle investigation | Progress reader is synchronous; streaming stall/cancellation reports need a live reproduction. Related #132. |
| #145 — Encode fails if file is hosted on a remote drive (ex: samba) | Unverified | Needs fresh NAS reproduction | Comments involve subtitle selection; do not infer that NAS failure is resolved. |
| #144 — Set VP9 as default | Feature / policy | Needs codec tradeoffs | VP9 default request; comments also describe VP9 tuning/two-pass issues needing independent verification. |
| #143 — mpv-webm makes corrupted file when exporting in 2x speed | Unverified | Needs reproduction / diagnosis | 2x playback-speed output corruption needs exact trim/source and timestamp/A-V sync comparison; get_speed_flags already exists. |
| #142 — output_directory and output_template arguments don't work with relative paths | Static behavior confirmed | Needs path semantics design | Templates strip separators; relative directory is passed through. Need policy for media-relative paths and directory creation. |
| #140 — Unable to fully select right/bottom edges of frame when cropping | Reproduced through real Xvfb mouse input | Draft PR #221 | Real Xvfb edge selections fail baseline (639x359 instead of 640x360). Four GUI tests pass with fix, including downscaling, letterboxing and interior encoded crop. |
| #139 — fps:10 option | Static omission confirmed | Draft PR #218 | 10 fps added to preset list; build passed. |
| #138 — output video color in 8 bit and srt hardsub style | Support / configuration | No defect established | Use available vf, subtitle styling, and additional encoder flags; requested settings need a concrete configuration example. |
| #136 — Output is getting horizontally flipped | Unverified | Needs reproduction / diagnosis | Sintel/YouTube reproduction and logs are attached in comments. Retest current versions before inferring transform/flip cause. |
| #135 — sh: mpv: command not found | Environment / support | PATH / executable discovery | Child process invokes mpv by name. Reports identify Windows PATH / Apple Silicon Homebrew PATH; platform validation needed. Documentation improvement in #222; environment issue remains separate. |
| #134 — Subprocess call failed when `--vf-add` contains space in Windows | Platform-blocked | Needs Windows validation | Progress shell/quoting or two-pass path report; cannot establish root cause from Linux alone. |
| #133 — Console output is red | Support / UX | Docs / presentation | mpv writes encoding status to stderr; red output alone is not an encoding failure. |
| #132 — cancel/stop an encoding task | Feature request | Requires async process lifecycle | Cancellation needs child ownership, progress, cleanup and UI design; related streaming stalls. |
| #131 — Source FPS is not preserved (CFR → VFR) | Upstream/container hypothesis | Needs current timing validation | Maintainer analyzed MOV sample-table/average-fps reporting; do not force CFR without proving frame timing loss. |
| #123 — Allow for target bitrate instead of target filesize | Feature request | Needs bitrate-mode design | Explicit target bitrate separate from filesize/CRF requested. |
| #121 — Change subtitle font for srt subtitles? | Support / configuration | No defect established | Use available vf, subtitle styling, and additional encoder flags; requested settings need a concrete configuration example. |
| #120 — Is there a way to edit the x264 settings this plugin uses? | Support / configuration | No defect established | Use available vf, subtitle styling, and additional encoder flags; requested settings need a concrete configuration example. |
| #113 — two pass MP4 fails: can't open stats file | Platform-blocked | Needs Windows validation | Progress shell/quoting or two-pass path report; cannot establish root cause from Linux alone. |
| #105 — [Feature Request] Appending Segments | Feature request | Requires workflow design | Segment concatenation / encode queue needs lifecycle and UI design. |
| #94 — HDR -> SDR tonemapping | Feature request | Needs color pipeline validation | HDR/Dolby Vision to SDR; #94 comments provide libplacebo workaround, not a universal validated conversion. |
| #91 — [suggestion] encodes job queue | Feature request | Requires workflow design | Segment concatenation / encode queue needs lifecycle and UI design. |
| #90 — Webm maker no longer opens | Unverified | Needs reproduction / diagnosis | Comments include a malformed Lua output_directory edit (extra bracket) that prevented script loading; no general startup defect established. |
| #87 — Encode freezes with certain files when audio is enabled | Reported upstream issue | Needs current media retest | Related audio-enabled freezes; tagged/diagnosed upstream historically. Revalidate with supplied/problematic media. |
| #86 — Encoding freezes on problematic videos if audio is enabled | Reported upstream issue | Needs current media retest | Related audio-enabled freezes; tagged/diagnosed upstream historically. Revalidate with supplied/problematic media. |
| #77 — MP4 encode failing? | Environment / support | Packaging / docs | mpv-linked libavcodec must include requested encoders. Installing a separate ffmpeg does not establish mpv codec availability. Documentation improvement in #222; environment issue remains separate. |
| #76 — Preset settings | Feature request | Needs preset design | Saved option presets; related requests. |
| #75 — Using twopass with libvpx (VP8) degrades quality | Known upstream limitation | No verified local fix | Maintainer attributes quality regression to real libvpx two-pass path; disabling two-pass is historical workaround. |
| #68 — Subs formatting | Unverified | Needs subtitle sample | Subtitle formatting report; compare source style, selected track and output. |
| #67 — low bitrate when using hevc_amf | Feature / hardware-specific | Needs AMD hardware validation | AMF profiles and bitrate behavior need codec-specific settings and hardware tests. |
| #62 — [Suggestion] Option to copy video instead of encoding it | Feature request | Prior design limitation | Stream-copy request; comment points to earlier #8 discussion. |
| #61 — Nothing happen after Started encode | Unverified | Needs reproduction / diagnosis | Live-stream “started encode” stall needs current playable source and cache/progress logs; related #153/#195. |
| #60 — Nothing happens after pressing E | Environment / historical | No current defect established | Maintainer diagnosed old mpv lacking mp.utils.file_info. |
| #58 — I can't use my mouse to click on the osc anymore if this is in my scripts. | Reporter-resolved configuration | No code fix needed | Comments identify duplicate script loading. |
| #50 — NUL-video-pass1.log | Reported / static | Existing PR | Log cleanup already covered by #211; review that PR rather than duplicate it. |
| #49 — Encode presets? | Feature request | Needs preset design | Saved option presets; related requests. |
| #48 — Fails to encode | Malformed strict-rate flags reproduced | Partial fix: draft PR #223 | AVC/MP3 emit nilk on baseline. Fixed real encodes use numeric rates and complete. Separate speed/sync report remains open. |
| #45 — Fix stream order | Upstream behavior / support | Needs muxer-level investigation | Stream order request involves mpv/muxer ordering, not a verified script mapping fix. |

## Verification notes

- Baseline full suite: **5 tests, 4 passed / 1 existing skip** (131.6s). The local harness's unread verbose stdout pipe blocked mpv; rerun passed with a temporary launcher redirecting that unused pipe to `/dev/null`. This launcher is not shipped in the PRs.
- Combined verification worktree with the initial eight changes (before the codec-specific #219 revision): **30 tests, 29 passed / 1 existing skip**. Uses the same temporary stdout-draining workaround, limited to the IPC player process. All fixes merged together cleanly.
- Focused regressions are recorded per PR, with baseline failures distinguished from fixed results.
- All task commits use author and committer **ekisu <dts.ramon@gmail.com>**. Published branches were checked after the attribution correction.
- Windows/macOS runtime reports, GPU-specific encoders, missing samples and streaming failures remain explicitly unverified. No speculative fixes or bulk issue closures.



## Harness update — 2026-09-12

#226 adds reliable real-mpv IPC/process/log handling, deterministic ranges, generated media and real Xvfb/xdotool GUI input. Compiler-fragment tests were removed and replaced with actual mpv regressions. #220, #221, #223, #224 and #225 are stacked on #226. #219 has been merged; its harness migration is a follow-up PR. Current per-branch pinned-Nix results supersede historical aggregate counts above:

- #221: Four real Xvfb GUI tests cover full-frame/reverse selection, downscaling, letterboxing, and interior cropping with encoded dimensions. Unfixed script yields 639x359 instead of 640x360; edge regressions fail before the fix and pass afterward. Pinned Nix: 18 tests, 17 passed, 1 existing audio skip.
- #224: Real mpv brightness/contrast/saturation properties and three actual encodes: disabled filters decode identically to neutral; enabled filters change pixels. Regression fails on the unfixed script. Pinned Nix: 15 tests, 14 passed, 1 existing audio skip.
- #219: Five real-encode cases now use the shared harness: x264/x265 constant-quality guards, VP8/AV1 pass preservation, and bitrate-targeted x264. All five pass locally. Pinned Nix: 19 tests, 17 passed, existing audio skip plus explicit optional libaom-av1-unavailable skip.
- #225: Three real-encode regressions cover padded sequential names, preserving existing files and filling gaps, and literal counter-looking source filenames. All three fail on the unfixed script. Pinned Nix: 17 tests, 16 passed, 1 existing audio skip.
- #220: Actual embedded SRT and ASS subtitles are encoded to GIF with two dithering settings. Decoded pixels verify visible captions and hidden/disabled equivalence. All four subtitle/dither subcases fail on the unfixed script. Pinned Nix: 15 tests, 14 passed, 1 existing audio skip.
- #223: Real AVC and audio-only MP3 encodes now use shared process/log/range helpers. Tests inspect output media and numeric b/minrate/maxrate arguments. Pinned Nix: 16 tests, 15 passed, 1 existing audio skip.

#226: 14 tests, 13 passed and 1 existing audio skip; GitHub build/test checks passed. All commits retain ekisu author and committer identity.


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Open-issue triage: reproduction evidence and draft fixes (2026-09-11) #217

Open-issue reproduction and fix tracker

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Harness update — 2026-09-12

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Draft PR	Issue	Change
#218	#139	Add 10 fps to the options menu
#219	#157	Skip incompatible x264/x265 constant-quality two-pass
#220	#172	Render GIF subtitles before palette generation
#221	#140	Include right/bottom edges in crop selection
#222	#163; related #135/#188/#202/#77	Document executable PATH and codec requirements
#223	#48 (partial)	Use correct video/audio strict min/max bitrate
#224	#156	Honor disabled current filters for color adjustments
#225	#167	Support numbered output filenames and collision checks

Issue	Reproduction status	Fixability / disposition	Evidence / next step
#208 — how to always delete x264_2pass.log.mbtree and x264_2pass.log	Reported / static	Existing PR	Log cleanup already covered by #211; review that PR rather than duplicate it.
#205 — Output Template, Property Expansion	Unverified	Needs focused reproduction	Property-expansion support question; validate nested syntax and current mpv expression support.
#203 — Cannot find the cut clip file after crop/encode: is it working?	Unverified	Needs reproduction / diagnosis	Windows report has no encoder log or resulting path. Request verbose log, webm.conf and output-directory writability.
#202 — Can Webm used in IINA, are there other convenient methods for video editing?	Environment / support	Packaging / docs	mpv-linked libavcodec must include requested encoders. Installing a separate ffmpeg does not establish mpv codec availability. Documentation improvement in #222; environment issue remains separate.
#199 — Cropping video not working, but can preview with crop	Unverified	Needs reproduction / diagnosis	Preview crop reportedly works but encoded NVENC/WebM output does not. Need current log, saved region and source sample before choosing a filter fix.
#198 — Quality settings do nothing	Unverified	Needs reproduction / diagnosis	Compare resolved CRF/target_filesize/strict settings and output bitrate on one source; report lacks a verified cause.
#197 — Any way to preserve video effects in output clip? (Speed, Pitch, ect.)	Feature / partial support	Needs precise effect requirements	Current code forwards playback speed and selected vf; not every playback effect is preserved.
#195 — Encoding occasionally stuck at 0% and never finishes	Unverified / intermittent	Needs lifecycle investigation	Progress reader is synchronous; streaming stall/cancellation reports need a live reproduction. Related #132.
#188 — Encode fails when MP4 or MP3 codes are selected on MacOS	Environment / support	Packaging / docs	mpv-linked libavcodec must include requested encoders. Installing a separate ffmpeg does not establish mpv codec availability. Documentation improvement in #222; environment issue remains separate.
#187 — Encode fails if source video file is located on a NAS and display_progress=yes	Platform-blocked	Needs Windows validation	Progress shell/quoting or two-pass path report; cannot establish root cause from Linux alone.
#186 — del	Empty report	No actionable fix	No body or reproduction steps.
#185 — Subtitles are missing when watching the preview	Unverified	Needs reproduction / diagnosis	One-line preview subtitle report: need selected track, sub-visibility, style/config and a subtitle sample.
#182 — active fork or alternative	Support / maintenance	No defect established	Discussion of forks and existing capabilities.
#172 — There are no subtitles in the generated GIF	Reproduced on baseline	Draft PR #220	SRT/ASS decoded-frame checks fail baseline, pass fix across both dither modes; parent verified.
#171 — webm conversion fails when going from 4:2:2 to 4:2:0 subsampling	Unverified	Needs reproduction / diagnosis	Old mpv 0.35 crop/autoconvert assertion for yuv422p→yuv420p. Retest current mpv with exact dimensions/source before treating as script defect.
#168 — [Request] Update the FFMPEG branch to contain the new features	Feature request	Requires branch maintenance	Request to update legacy FFmpeg branch, not a reproduced defect.
#167 — %04n output_template naming	Reproduced on baseline	Draft PR #225	Three real-mpv tests fail baseline and pass fix: sequential counters, collision/gap reuse and literal source names; existing output bytes preserved.
#166 — Slightly off colors in generated webm	Unverified	Needs reproduction / diagnosis	Color screenshots do not establish conversion error. Need source color metadata and measured output; inspect VP8 colormatrix conversion.
#165 — [Request] Apply GLSL shaders to output	Feature request	Requires rendering design	GLSL playback shaders are not ordinary encoding vf filters; forwarding flags alone is not a verified solution.
#163 — coding error when displaying progress (revision of the installation instructions)	Documentation gap confirmed	Draft PR #222	Documents Windows/macOS/Linux PATH and mpv codec requirements; platform setup steps not newly executed.
#161 — [Request] Encode speed option	Feature request	Needs option design	Per-codec encoding-speed/preset settings requested.
#160 — Crop error on videos containing landscape-rotated iOS screen recordings	Unverified; sample supplied	Needs rotation reproduction	Use linked iOS sample; investigate displayed crop coordinates versus encoded orientation.
#158 — add hevc_amf and h264_amf encoding profiles	Feature / hardware-specific	Needs AMD hardware validation	AMF profiles and bitrate behavior need codec-specific settings and hardware tests.
#157 — error when selecting (h264/AAC), twopass=yes and target_filesize=0	Reproduced on baseline	Draft PR #219	x264/x265 constant-quality second passes fail. Codec-specific guard passes five real-encode checks and preserves VP8/AV1 and bitrate-targeted x264 two-pass behavior.
#156 — Contrast and Saturation are kept when "Apply Current Video Filters: no" is set	Reproduced through real mpv output	Draft PR #224	Real encodes verify disabled adjustments equal neutral pixels and enabled adjustments differ; fails baseline, passes fix.
#155 — When using MP4 (h264/AAC) preset, first few frames are always gray and corrupted	Unverified	Needs reproduction / diagnosis	Initial gray/corrupt MP4 frames: need reproducible source/trim timestamps and decoded GOP analysis.
#154 — Failed to encode ani-cli output	Unverified	Needs reproduction / diagnosis	ani-cli-specific URL report while local/YouTube worked; requires current resolved URL and verbose log.
#153 — Issues with HLS stream Webm Encoding	Unverified	Needs reproduction / diagnosis	HLS/Streamlink reports include a later --no-config reproduction and log attachment; current cache-dump/live-stream behavior needs a live retest.
#152 — WebM audio of encoded clip is always much lower than the original audio	Unverified	Needs reproduction / diagnosis	Reported ~50% lower WebM loudness. Need measured source/output loudness, channel layout and replaygain/volume settings; bitrate alone does not establish cause.
#149 — dolby vision to sdr with the right colors	Feature request	Needs color pipeline validation	HDR/Dolby Vision to SDR; #94 comments provide libplacebo workaround, not a universal validated conversion.
#147 — Stupid question about key remapping	Feature / support	Bounded config enhancement	Crop-key remapping workaround confirmed in comments; configurable crop binding remains requested.
#146 — Progress Bar for Encode Process	Unverified / intermittent	Needs lifecycle investigation	Progress reader is synchronous; streaming stall/cancellation reports need a live reproduction. Related #132.
#145 — Encode fails if file is hosted on a remote drive (ex: samba)	Unverified	Needs fresh NAS reproduction	Comments involve subtitle selection; do not infer that NAS failure is resolved.
#144 — Set VP9 as default	Feature / policy	Needs codec tradeoffs	VP9 default request; comments also describe VP9 tuning/two-pass issues needing independent verification.
#143 — mpv-webm makes corrupted file when exporting in 2x speed	Unverified	Needs reproduction / diagnosis	2x playback-speed output corruption needs exact trim/source and timestamp/A-V sync comparison; get_speed_flags already exists.
#142 — output_directory and output_template arguments don't work with relative paths	Static behavior confirmed	Needs path semantics design	Templates strip separators; relative directory is passed through. Need policy for media-relative paths and directory creation.
#140 — Unable to fully select right/bottom edges of frame when cropping	Reproduced through real Xvfb mouse input	Draft PR #221	Real Xvfb edge selections fail baseline (639x359 instead of 640x360). Four GUI tests pass with fix, including downscaling, letterboxing and interior encoded crop.
#139 — fps:10 option	Static omission confirmed	Draft PR #218	10 fps added to preset list; build passed.
#138 — output video color in 8 bit and srt hardsub style	Support / configuration	No defect established	Use available vf, subtitle styling, and additional encoder flags; requested settings need a concrete configuration example.
#136 — Output is getting horizontally flipped	Unverified	Needs reproduction / diagnosis	Sintel/YouTube reproduction and logs are attached in comments. Retest current versions before inferring transform/flip cause.
#135 — sh: mpv: command not found	Environment / support	PATH / executable discovery	Child process invokes mpv by name. Reports identify Windows PATH / Apple Silicon Homebrew PATH; platform validation needed. Documentation improvement in #222; environment issue remains separate.
#134 — Subprocess call failed when `--vf-add` contains space in Windows	Platform-blocked	Needs Windows validation	Progress shell/quoting or two-pass path report; cannot establish root cause from Linux alone.
#133 — Console output is red	Support / UX	Docs / presentation	mpv writes encoding status to stderr; red output alone is not an encoding failure.
#132 — cancel/stop an encoding task	Feature request	Requires async process lifecycle	Cancellation needs child ownership, progress, cleanup and UI design; related streaming stalls.
#131 — Source FPS is not preserved (CFR → VFR)	Upstream/container hypothesis	Needs current timing validation	Maintainer analyzed MOV sample-table/average-fps reporting; do not force CFR without proving frame timing loss.
#123 — Allow for target bitrate instead of target filesize	Feature request	Needs bitrate-mode design	Explicit target bitrate separate from filesize/CRF requested.
#121 — Change subtitle font for srt subtitles?	Support / configuration	No defect established	Use available vf, subtitle styling, and additional encoder flags; requested settings need a concrete configuration example.
#120 — Is there a way to edit the x264 settings this plugin uses?	Support / configuration	No defect established	Use available vf, subtitle styling, and additional encoder flags; requested settings need a concrete configuration example.
#113 — two pass MP4 fails: can't open stats file	Platform-blocked	Needs Windows validation	Progress shell/quoting or two-pass path report; cannot establish root cause from Linux alone.
#105 — [Feature Request] Appending Segments	Feature request	Requires workflow design	Segment concatenation / encode queue needs lifecycle and UI design.
#94 — HDR -> SDR tonemapping	Feature request	Needs color pipeline validation	HDR/Dolby Vision to SDR; #94 comments provide libplacebo workaround, not a universal validated conversion.
#91 — [suggestion] encodes job queue	Feature request	Requires workflow design	Segment concatenation / encode queue needs lifecycle and UI design.
#90 — Webm maker no longer opens	Unverified	Needs reproduction / diagnosis	Comments include a malformed Lua output_directory edit (extra bracket) that prevented script loading; no general startup defect established.
#87 — Encode freezes with certain files when audio is enabled	Reported upstream issue	Needs current media retest	Related audio-enabled freezes; tagged/diagnosed upstream historically. Revalidate with supplied/problematic media.
#86 — Encoding freezes on problematic videos if audio is enabled	Reported upstream issue	Needs current media retest	Related audio-enabled freezes; tagged/diagnosed upstream historically. Revalidate with supplied/problematic media.
#77 — MP4 encode failing?	Environment / support	Packaging / docs	mpv-linked libavcodec must include requested encoders. Installing a separate ffmpeg does not establish mpv codec availability. Documentation improvement in #222; environment issue remains separate.
#76 — Preset settings	Feature request	Needs preset design	Saved option presets; related requests.
#75 — Using twopass with libvpx (VP8) degrades quality	Known upstream limitation	No verified local fix	Maintainer attributes quality regression to real libvpx two-pass path; disabling two-pass is historical workaround.
#68 — Subs formatting	Unverified	Needs subtitle sample	Subtitle formatting report; compare source style, selected track and output.
#67 — low bitrate when using hevc_amf	Feature / hardware-specific	Needs AMD hardware validation	AMF profiles and bitrate behavior need codec-specific settings and hardware tests.
#62 — [Suggestion] Option to copy video instead of encoding it	Feature request	Prior design limitation	Stream-copy request; comment points to earlier #8 discussion.
#61 — Nothing happen after Started encode	Unverified	Needs reproduction / diagnosis	Live-stream “started encode” stall needs current playable source and cache/progress logs; related #153/#195.
#60 — Nothing happens after pressing E	Environment / historical	No current defect established	Maintainer diagnosed old mpv lacking mp.utils.file_info.
#58 — I can't use my mouse to click on the osc anymore if this is in my scripts.	Reporter-resolved configuration	No code fix needed	Comments identify duplicate script loading.
#50 — NUL-video-pass1.log	Reported / static	Existing PR	Log cleanup already covered by #211; review that PR rather than duplicate it.
#49 — Encode presets?	Feature request	Needs preset design	Saved option presets; related requests.
#48 — Fails to encode	Malformed strict-rate flags reproduced	Partial fix: draft PR #223	AVC/MP3 emit nilk on baseline. Fixed real encodes use numeric rates and complete. Separate speed/sync report remains open.
#45 — Fix stream order	Upstream behavior / support	Needs muxer-level investigation	Stream order request involves mpv/muxer ordering, not a verified script mapping fix.

Open-issue triage: reproduction evidence and draft fixes (2026-09-11) #217

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Harness update — 2026-09-12

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