Audio cut off in screencast

[Kai Hendry]

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

[Kai 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

[Carl Eugen Hoyos]

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"?

[Kai 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.

[Elon Musk]

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

[Kai 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.

[Fredrick Brennan]

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

[Elon Musk]

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

[zarac]

Same on Arch x86_64 Linux 4.12.8.

[Neven Sajko]

There's more info that seems like it could be useful if someone tries to tackle this bug here: ​https://trac.ffmpeg.org/ticket/9199

In that case the last 15 seconds of audio are cut off (instead of just the last two), and pulseaudio isn't used, just ALSA directly.

There's also a large ffreport.log attached to that bug report (which is now closed as a duplicate).