matham
Audio thread error for version >= 4.4: Channel layout change is not supported
Hi there,
and first of all thanks for ffpyplayer! It's very powerful to have these bindings :)
I noticed an issue with the latest version (4.5) of ffpyplayer relating to playing the audio streams from certain video files: When starting to play the video, no audio can be heard and the following error is logged:
[ffpyplayer_abuffersink @ 0x600003f30210] Channel layout change is not supported
Audio thread error: Not yet implemented in FFmpeg, patches welcome
As hinted upon in this reddit thread, downgrading to 4.3.5 indeed helped: The audio plays as expected, emitting only the following log message in place of the one above:
[ffpyplayer_abuffersink @ 0x600002fe8790] Removing channel layout 0x3, redundant with 2 channels
The video plays fine via ffplay, including audio, so I would have expected ffpyplayer to also play it without issues.
Is there something between v4.3.5 and 4.5 that might have caused this error? Was this a deliberate change?
I don't know the codebase really, but I'm happy to dive into this, if it helps.
Python 3.10.12, macOS 13.4.1
ffpyplayer.player.MediaPlayer(
video_url,
lib_opts={},
ff_opts=dict(sync="audio", ss=0, infbuf=True),
)
$ ffprobe video.mp4
ffprobe version 6.0 Copyright (c) 2007-2023 the FFmpeg developers
built with Apple clang version 14.0.3 (clang-1403.0.22.14.1)
configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.0 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
libavutil 58. 2.100 / 58. 2.100
libavcodec 60. 3.100 / 60. 3.100
libavformat 60. 3.100 / 60. 3.100
libavdevice 60. 1.100 / 60. 1.100
libavfilter 9. 3.100 / 9. 3.100
libswscale 7. 1.100 / 7. 1.100
libswresample 4. 10.100 / 4. 10.100
libpostproc 57. 1.100 / 57. 1.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x13c804ae0] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1000
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x13c804ae0] st: 0 edit list 1 Cannot find an index entry before timestamp: 1000.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
Metadata:
major_brand : XAVC
minor_version : 16785407
compatible_brands: XAVCmp42iso2
creation_time : 2023-05-16T22:35:07.000000Z
Duration: 00:02:23.04, start: 0.000000, bitrate: 98555 kb/s
Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/iec61966-2-4, progressive), 3840x2160 [SAR 1:1 DAR 16:9], 96812 kb/s, 25 fps, 25 tbr, 25k tbn (default)
Metadata:
creation_time : 2023-05-16T22:35:07.000000Z
handler_name : Video Media Handler
vendor_id : [0][0][0][0]
encoder : AVC Coding
Stream #0:1[0x2](und): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
Metadata:
creation_time : 2023-05-16T22:35:07.000000Z
handler_name : Sound Media Handler
vendor_id : [0][0][0][0]
Stream #0:2[0x3](und): Data: none (rtmd / 0x646D7472), 204 kb/s (default)
Metadata:
creation_time : 2023-05-16T22:35:07.000000Z
handler_name : Timed Metadata Media Handler
timecode : 14:54:11:01
Unsupported codec with id 0 for input stream 2
Have the same issue when i used ffpyplayer 4.3.5 it printed:
[ffpyplayer_abuffersink @ 0x600002fe8790] Removing channel layout 0x4, redundant with 1 channels
downgrading to 4.3.5 not very good. it fixes the issue but video frames on the left shows some short lines like confusion in frames I'm using kivy for video showing
@blsqr the audio codec i think of this video isn't mp3 or ogg i tried to play wav on 4.5 and gave the same error but works fine when convert it to mp3 the change between 4.3.5 and 4.5 is ability to play wav and other codecs change the audio codec of your video to be mp3
Thanks for sharing this, @IVAN-QX! Unfortunately, I don't have the option of changing audio codecs, I need to work with the existing videos and cannot re-encode them.
Also, the fact that ffplay has no issues with playing the audio and it previously working suggests that something else might be going on 🤔