#11330: -f pulse cuts last 2 secodns of audio
-------------------------------------+-------------------------------------
Reporter: | Type: defect
chuckwoodchuck |
Status: new | Priority: important
Component: ffmpeg | Version:
| unspecified
Keywords: pulseaudio | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
-f pulse cuts last 2-3 seconds of audio when stopped by hitting "q"
How to reproduce:
I observed the behavior by recording screen with x11grab for video and
pulse for audio. Last 2 seconds of audio are missing in every file.
{{{
$ ffmpeg -y -f x11grab -i "$DISPLAY" -f pulse -i alsa_output.pci-
0000_05_00.6.analog-stereo.monitor /tmp/recording.mp4
}}}
I decided to split video and audio with -map to separate files to measure
the stream length, and indeed audio is shorter:
{{{
$ ffmpeg -y -f x11grab -i "$DISPLAY" -f pulse -i alsa_output.pci-
0000_05_00.6.analog-stereo.monitor -map 0:v /tmp/foo.mp4 -map 1:a
/tmp/foo_audio.mp4
$ ffprobe /tmp/foo_audio.mp4 |& grep Duration
Duration: 00:00:02.08, start: 0.000000, bitrate: 135 kb/s
$ ffprobe /tmp/foo.mp4 |& grep Duration
Duration: 00:00:04.37, start: 0.000000, bitrate: 912 kb/s
}}}
It's not an issue with x11grab. Passing an arbitrary file in its place (-i
something/mp4) produces the same effect with the audio being 2-3 seconds
shorter.
The audio is not cut when total recording length is specified beforehand,
with -t 15. It happens only when "q" is hit.
The issue occurs on ffmpeg versions 5.1, 7.1 (Debian stable/sid) and
recent builds, too. There's no difference between the pulseaudio or
pipewire-pulse as the backend.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11330>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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