[WIP] Add language detection features to CLI and GUI scripts

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Problem Statement

Add features to both the CLI script (1_Improved_REMUX_Script.py) and GUI script (remux_gui.py) to detect and display available languages in MKV files before prompting the user for language selection.

Changes Required for REMUX Python Scripts/1_Improved_REMUX_Script.py:

1. Add a new function get_available_languages() after the identify_tracks() function (around line 43):

   • This function should scan all MKV files in the provided list
   • Extract all unique audio and subtitle languages from the tracks
   • Return two sorted lists: audio languages and subtitle languages
   • Display a scanning message using console.print()

2. Add a new function prompt_language_selection() after get_available_languages():

   • Display the available audio languages found
   • Display the available subtitle languages found
   • Prompt user to enter desired audio languages (comma-separated)
   • Prompt user to enter desired subtitle languages (comma-separated)
   • Validate that entered languages exist in the available languages (show warning if not)
   • Return the selected audio and subtitle language lists

3. Modify the main() function (starting at line 391):

   • After collecting mkv_files (around line 431), call get_available_languages(mkvmerge_path, mkv_files) to scan files
   • If no audio languages are found, print error and return
   • Call prompt_language_selection() with the available languages to get user's choice
   • Remove the manual input prompts for audio_langs and sub_langs (lines 407-414)
   • The selected languages should be passed to remux_file_and_update() as before
   • Update the log file to include selected audio and subtitle languages (around line 452)

Changes Required for REMUX Python Scripts/remux_gui.py:

1. Add the same get_available_languages() function after identify_tracks() (around line 37):

   • Same functionality as CLI version but without console.print statements

2. Add a new method scan_languages() to the RemuxApp class (after browse_output() method around line 220):

   • Check if input directory is valid
   • Get list of MKV files from input directory
   • Show warning if no files found
   • Update status label to show scanning progress
   • Disable the scan button during scanning
   • Run get_available_languages() in a separate thread to avoid freezing GUI
   • Call display_scan_results() when done

3. Add a new method display_scan_results() to the RemuxApp class:

   • Create a popup window (Toplevel) to display results
   • Show available audio languages in a scrollable Text widget
   • Show available subtitle languages in a scrollable Text widget
   • Add a "Use These Languages" button that populates the language entry fields
   • Add a "Close" button
   • Re-enable the scan button and update status label

4. Modify the UI in __init__() method (around line 157-164):

   • Add a "Scan Languages" button after the language entry fields
   • This button should call self.scan_languages()
   • Add tooltip or label indicating users can scan files to see available languages
   • Ensure the scan button is disabled if mkvmerge is not found

5. Update the start_remux() method:

   • Disable the scan button when remuxing starts
   • Re-enable it when finished (in the process_queue method around line 283)

Expected Behavior:

CLI Script:

• After user selects input/output directories, script scans all MKV files
• Displays: "Available audio languages: eng, jpn, ger" (example)
• Displays: "Available subtitle languages: eng, ger, fre" (example)
• Prompts user to select which languages to keep
• Shows selected languages before processing begins

GUI Script:

• User selects input directory
• User clicks "🔍 Scan Available Languages" button
• Popup shows all available languages found in the files
• User can click "Use These Languages" to auto-populate the entry fields
• User can manually edit the fields before starting remux
• Scan button is disabled during scanning and remuxing

Important Notes:

• Keep all existing functionality intact
• Language codes should be normalized to lowercase
• Handle the case where language is "und" (undefined)
• The remux logic already accepts audio_langs and sub_langs parameters, so that doesn't need to change
• Maintain the existing Rich UI formatting for the CLI script
• Maintain the existing tkinter UI structure for the GUI script

This pull request was created as a result of the following prompt from Copilot chat.

Problem Statement

Add features to both the CLI script (1_Improved_REMUX_Script.py) and GUI script (remux_gui.py) to detect and display available languages in MKV files before prompting the user for language selection.

Changes Required for REMUX Python Scripts/1_Improved_REMUX_Script.py:

1. Add a new function get_available_languages() after the identify_tracks() function (around line 43):

   • This function should scan all MKV files in the provided list
   • Extract all unique audio and subtitle languages from the tracks
   • Return two sorted lists: audio languages and subtitle languages
   • Display a scanning message using console.print()

2. Add a new function prompt_language_selection() after get_available_languages():

   • Display the available audio languages found
   • Display the available subtitle languages found
   • Prompt user to enter desired audio languages (comma-separated)
   • Prompt user to enter desired subtitle languages (comma-separated)
   • Validate that entered languages exist in the available languages (show warning if not)
   • Return the selected audio and subtitle language lists

3. Modify the main() function (starting at line 391):

   • After collecting mkv_files (around line 431), call get_available_languages(mkvmerge_path, mkv_files) to scan files
   • If no audio languages are found, print error and return
   • Call prompt_language_selection() with the available languages to get user's choice
   • Remove the manual input prompts for audio_langs and sub_langs (lines 407-414)
   • The selected languages should be passed to remux_file_and_update() as before
   • Update the log file to include selected audio and subtitle languages (around line 452)

Changes Required for REMUX Python Scripts/remux_gui.py:

1. Add the same get_available_languages() function after identify_tracks() (around line 37):

   • Same functionality as CLI version but without console.print statements

2. Add a new method scan_languages() to the RemuxApp class (after browse_output() method around line 220):

   • Check if input directory is valid
   • Get list of MKV files from input directory
   • Show warning if no files found
   • Update status label to show scanning progress
   • Disable the scan button during scanning
   • Run get_available_languages() in a separate thread to avoid freezing GUI
   • Call display_scan_results() when done

3. Add a new method display_scan_results() to the RemuxApp class:

   • Create a popup window (Toplevel) to display results
   • Show available audio languages in a scrollable Text widget
   • Show available subtitle languages in a scrollable Text widget
   • Add a "Use These Languages" button that populates the language entry fields
   • Add a "Close" button
   • Re-enable the scan button and update status label

4. Modify the UI in __init__() method (around line 157-164):

   • Add a "Scan Languages" button after the language entry fields
   • This button should call self.scan_languages()
   • Add tooltip or label indicating users can scan files to see available languages
   • Ensure the scan button is disabled if mkvmerge is not found

5. Update the start_remux() method:

   • Disable the scan button when remuxing starts
   • Re-enable it when finished (in the process_queue method around line 283)

Expected Behavior:

CLI Script:

• After user selects input/output directories, script scans all MKV files
• Displays: "Available audio languages: eng, jpn, ger" (example)
• Displays: "Available subtitle languages: eng, ger, fre" (example)
• Prompts user to select which languages to keep
• Shows selected languages before processing begins

GUI Script:

• User selects input directory
• User clicks "🔍 Scan Available Languages" button
• Popup shows all available languages found in the files
• User can click "Use These Languages" to auto-populate the entry fields
• User can manually edit the fields before starting remux
• Scan button is disabled during scanning and remuxing

Important Notes:

• Keep all existing functionality intact
• Language codes should be normalized to lowercase
• Handle the case where language is "und" (undefined)
• The remux logic already accepts audio_langs and sub_langs parameters, so that doesn't need to change
• Maintain the existing Rich UI formatting for the CLI script
• Maintain the existing tkinter UI structure for the GUI script

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