Opened 2 years ago

Last modified 2 months ago

#4703 new defect

Audio cut off in screencast

Reported by: hendry Owned by:
Priority: normal Component: undetermined
Version: unspecified Keywords:
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Summary of the bug: Last second or two of audio is cut off during a screencast: http://s.natalian.org/2015-07-08/cutoff.mp4

How to reproduce:

% ffmpeg -v warning -f x11grab -video_size 1920x1080 -i :0 -f alsa -i pulse -acodec pcm_s16le -c:v libx264 /tmp/cutoff.mkv &>> /tmp/r2d2.log &
ffmpeg version 2.7.1
built on Archlinux

When i kill ffmpeg during a screencast, my voice is cut off http://s.natalian.org/2015-07-08/cutoff.mp4
Here is the log http://s.natalian.org/2015-07-08/cutoff.txt

Regular kill and kill -INT $pid has the same problem.

Source of my script: https://github.com/kaihendry/recordmydesktop2.0/blob/master/x11capture

Change History (8)

comment:1 Changed 2 years ago by hendry

I can confirm the bug with the pulse audio line from https://trac.ffmpeg.org/wiki/Capture/Desktop ffmpeg -video_size 1024x768 -framerate 25 -f x11grab -i :0.0+100,200 -f pulse -ac 2 -i default output.mkv

comment:2 Changed 2 years ago by cehoyos

First steps to make this a valid ticket are to test current FFmpeg git head and provide the command line that allows to reproduce the issue together with the complete, uncut console output here on the bug tracker.
Is the issue also reproducible if you press "q"?

comment:3 Changed 2 years ago by hendry

I just built from git head ffmpeg version N-73452-g80e4238 and the problem exists. http://s.natalian.org/2015-07-08/1to5.mkv

Yes, I pressed "q" to stop the video after saying five.

comment:4 Changed 2 years ago by richardpl

Does it also happens if you only record audio without video?

comment:5 Changed 2 years ago by hendry

It does not happen when I record just with audio: http://s.natalian.org/2015-07-09/sound-only.mkv with ffmpeg -f pulse -i default sound-only.mkv.

I believe this to be a fairly recent (last two months?) regression, but I don't have time to bisect atm.

comment:6 Changed 2 years ago by copypaste

This is happening to me as well. The last few seconds of my voice get cut off. Arch Linux as well.

comment:7 Changed 13 months ago by richardpl

Happens also on Fedora 23, as reported by rhn on irc.

comment:8 Changed 2 months ago by zarac

Same on Arch x86_64 Linux 4.12.8.

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