[FFmpeg-trac] #10114(ffmpeg:new): audio sync lags while recording x11grab

[FFmpeg]

#10114: audio sync lags while recording x11grab
-------------------------------------+-------------------------------------
             Reporter:  betlog       |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  ffmpeg
              Version:  unspecified  |               Resolution:
             Keywords:  x11grab      |               Blocked By:
  pulseaudio                         |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by betlog):

 * keywords:  x11grab => x11grab pulseaudio


Old description:

> Summary of the bug:
> When recording desktop using x11grab the audio is several seconds behind
> the video
> -effects Kubuntu 22.04
> -does not effect Kubuntu 20.04
> How to reproduce:
> {{{
> ffmpeg -v 9 -loglevel 99 \
>          -hwaccel cuvid \
>          -c:v h264_cuvid \
>          -f pulse \
>                  -acodec pcm_f32le  \
>                  -probesize 32 \
>                  -i $(pactl list sources short|grep
> 'analog.*stereo.*monitor'|awk '{print $2}') \
>          -f x11grab \
>                  -framerate 60.00 \
>                  -video_size 1920x1080 \
>                  -i :0.0+0,0 \
>                  -g 60 \
>          -map 1:v \
>          -map 0:a \
>          -c:v h264_nvenc -qp 18 \
>          -c:a aac -ac 2 -channel_layout stereo -b:a 128k -r:a 48000  \
>          "/media/user/video12/$(date +%Y-%m-%d--%H-%M-%S)_TEST.mkv"
>

> ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg
> developers
>   built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
> }}}

New description:

 ffmpeg version 4.4.2-0ubuntu0.22.04.1

 Summary of the bug:
 When recording desktop using x11grab the audio is several seconds behind
 the video
 -effects Kubuntu 22.04
 -does not effect Kubuntu 20.04
 How to reproduce:
 {{{
 ffmpeg -v 9 -loglevel 99 \
          -hwaccel cuvid \
          -c:v h264_cuvid \
          -f pulse \
                  -acodec pcm_f32le  \
                  -probesize 32 \
                  -i $(pactl list sources short|grep
 'analog.*stereo.*monitor'|awk '{print $2}') \
          -f x11grab \
                  -framerate 60.00 \
                  -video_size 1920x1080 \
                  -i :0.0+0,0 \
                  -g 60 \
          -map 1:v \
          -map 0:a \
          -c:v h264_nvenc -qp 18 \
          -c:a aac -ac 2 -channel_layout stereo -b:a 128k -r:a 48000  \
          "/media/user/video12/$(date +%Y-%m-%d--%H-%M-%S)_TEST.mkv"
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/10114#comment:1>
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