The recording file hear crackle and fast

[TechGuyVN]

i got the issued that sound play by
switch_buffer_write(tech_pvt->write_sbuffer, ptr, chunk);
User still hear normal but when record file by uuid_record the recording file will hear crackle sound about 1-2s each time play audio
Can you help me solve this

[eschmidbauer]

i rebased code with latest libswc which has some significant updates. Can you please retest with latest code? Also, can you tell me how to reproduce the issue?

[TechGuyVN]

Thanks @eschmidbauer

I tried new code but it still happend.

Here is step to reproduce

• Using Phone number call into a SIP Number setting in Freeswitch
• Using this Mod to fork audio to socket server
• Socket server send WAV answer audio encode base64 like Voice BOT
• Call will have only one channel
• Mod receive in ProcessMessage and Write to buffer -> thread write_frame_thread read buffer and write frame to session by function switch_core_session_write_frame -> Audio
• In the mobile Phone hear clearly sound from VoiceBOT
• using luascript trigger session_record function or uuid_record to record the call
• End call and play recording file -> sound from user talk to BOT is OK, Sound from VoiceBOT hear crackle and fast, duration of recording file = 1/2 real duration call

I have notice that if we use function playback or uuid_broadcast -> sound of recording normal, it happend when use switch_core_session_write_frame to write frame only

I have log tha variable like "sample rate"/"recording rate" all have the same value = 8000
Pls help

[TechGuyVN]

hello did you re-check this issued

[eschmidbauer]

@TechGuyVN yes - i am not able to reproduce the issue. I've update the echo.py app to playback audio and lua script to record the session. the audio recorded from the playback seemed fine.