audio goes silent after skipping/fast forward/fast backward

[mitzsch]

mpv Information

[   0.001][v][cplayer] mpv v0.39.0-24-g53f2619d Copyright © 2000-2024 mpv/MPlayer/mplayer2 projects
[   0.002][v][cplayer]  built on Sep 27 2024 00:12:05
[   0.002][v][cplayer] libplacebo version: v7.349.0 (v7.349.0-13-ga018ab0-dirty)
[   0.002][v][cplayer] FFmpeg version: N-117212-g01c47dd23
[   0.002][v][cplayer] FFmpeg library versions:
[   0.002][v][cplayer]    libavcodec      61.20.100
[   0.002][v][cplayer]    libavdevice     61.4.100
[   0.002][v][cplayer]    libavfilter     10.5.100
[   0.002][v][cplayer]    libavformat     61.8.100
[   0.002][v][cplayer]    libavutil       59.40.100
[   0.002][v][cplayer]    libswresample   5.4.100
[   0.002][v][cplayer]    libswscale      8.4.100

Other Information

- Windows version: Windows 11 - Microsoft Windows NT 10.0.22631.0/22631.4169
- GPU model, driver and version: RTX3060 TI - Game Ready - 565.90
- Source of mpv: shinchiro
- Introduced in version: not known

Reproduction Steps

Open a movie file fast forward/fast backward many times, and/or click randomly in the OSD at different spots in the timeline. After doing this multiple times the audio goes silent.

In the log, these lines get printed:

[  30.381][v][cplayer] delaying audio start 2231.376979 vs. 2230.061000, diff=1.315979
[  30.424][v][cplayer] delaying audio start 2231.376979 vs. 2230.103000, diff=1.273979
[  30.466][v][cplayer] delaying audio start 2231.376979 vs. 2230.145000, diff=1.231979
[  30.507][v][cplayer] delaying audio start 2231.376979 vs. 2230.186000, diff=1.190979
[  30.548][v][cplayer] delaying audio start 2231.376979 vs. 2230.228000, diff=1.148979
[  30.590][v][cplayer] delaying audio start 2231.376979 vs. 2230.270000, diff=1.106979
[  30.633][v][cplayer] delaying audio start 2231.376979 vs. 2230.311000, diff=1.065979
[  30.673][v][cplayer] delaying audio start 2231.376979 vs. 2230.353000, diff=1.023979
[  30.715][v][cplayer] delaying audio start 2231.376979 vs. 2230.395000, diff=0.981979
[  30.757][v][cplayer] delaying audio start 2231.376979 vs. 2230.437000, diff=0.939979
[  30.799][v][cplayer] delaying audio start 2231.376979 vs. 2230.478000, diff=0.898979
[  30.840][v][cplayer] delaying audio start 2231.376979 vs. 2230.520000, diff=0.856979
[  30.883][v][cplayer] delaying audio start 2231.376979 vs. 2230.562000, diff=0.814979
[  30.925][v][cplayer] delaying audio start 2231.376979 vs. 2230.603000, diff=0.773979
[  30.965][v][cplayer] delaying audio start 2231.376979 vs. 2230.645000, diff=0.731979
[  31.008][v][cplayer] delaying audio start 2231.376979 vs. 2230.687000, diff=0.689979
[  31.049][v][cplayer] delaying audio start 2231.376979 vs. 2230.729000, diff=0.647979
[  31.091][v][cplayer] delaying audio start 2231.376979 vs. 2230.770000, diff=0.606979
[  31.133][v][cplayer] delaying audio start 2231.376979 vs. 2230.812000, diff=0.564979
[  31.174][v][cplayer] delaying audio start 2231.376979 vs. 2230.854000, diff=0.522979
[  31.216][v][cplayer] delaying audio start 2231.376979 vs. 2230.895000, diff=0.481979
[  31.257][v][cplayer] delaying audio start 2231.376979 vs. 2230.937000, diff=0.439979
[  31.300][v][cplayer] delaying audio start 2231.376979 vs. 2230.979000, diff=0.397979
[  31.341][v][cplayer] delaying audio start 2231.376979 vs. 2231.020000, diff=0.356979
[  31.383][v][cplayer] delaying audio start 2231.376979 vs. 2231.062000, diff=0.314979
[  31.425][v][cplayer] delaying audio start 2231.376979 vs. 2231.104000, diff=0.272979
[  31.467][v][cplayer] delaying audio start 2231.376979 vs. 2231.146000, diff=0.230979
[  31.508][v][cplayer] delaying audio start 2231.376979 vs. 2231.187000, diff=0.189979
[  31.549][v][cplayer] delaying audio start 2231.376979 vs. 2231.229000, diff=0.147979
[  31.591][v][cplayer] delaying audio start 2231.376979 vs. 2231.271000, diff=0.105979
[  31.633][v][cplayer] delaying audio start 2231.376979 vs. 2231.312000, diff=0.064979
[  31.680][v][cplayer] delaying audio start 2231.376979 vs. 2231.354000, diff=0.022979
[  31.716][v][cplayer] starting audio playback
[  31.716][v][cplayer] audio draining
[  31.716][d][ao/wasapi] Thread Resume
[  31.716][d][ao/wasapi] Thread Reset
[  31.716][d][ao/wasapi] Thread Pause
[  31.716][v][cplayer] audio EOF reached

Sometimes the audio comes back after the diff= goes to zero but in my testing, most of the time, the audio stays silent after the diff counter goes to zero. The log also indicates "audio EOF reached" which is not true.

I tested an older version of mpv that I had lying around on my PC. That does not exhibit this behavior. (mpv v0.37.0-766-ge42a8d53)

Expected Behavior

Fast forward/fast backward as many often as you want, without losing audio.

Actual Behavior

Fast forward/fast backward very often, audio playback is lost.

Log File

mpv-scrub-audio-out_new.txt

Snipped of a log on a different file with a DTS-HD track

audio-delay-after-skip.txt

Log of old mpv that does not show this issue:

mpv-scrub-audio-out_olderV.txt

Sample Files

No response

I carefully read all instruction and confirm that I did the following:

• I tested with the latest mpv version to validate that the issue is not already fixed.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.

[llyyr]

Can you upload the audio track?

[mitzsch]

unfortunately, I'm not allowed to upload that track... copyright. I will do some more testing, maybe I can find the version that introduced that behavior.

[fir05]

I have a similar problem, after adjusting the progress, the video stutters, the audio is fine, and sometimes the video is fine but there is no sound. Error reported:
Audio/Video desynchronisation detected! Possible reasons include too slow
hardware, temporary CPU spikes, broken drivers, and broken files. Audio
position will not match to the video (see A-V status field).
Consider trying --profile=fast and/or --hwdec=auto-safe as they may help.

There is no problem with the hardware
The cpu is not occupied
Files are played using PotPlayer without this problem
The parameter “profile=fast,hwdec=auto-safe” was use

I use mpv.dll from this page
https://github.com/shinchiro/mpv-winbuild-cmake/releases
When I switch to the old 20240720 version of mpv.dll there is also no problem

I only found this problem on a highly compressed 4K mkv video.