[FFmpeg-trac] #5900(undetermined:new): alsa/pulse grab cuts last 2 seconds of audio
FFmpeg
trac at avcodec.org
Thu Oct 20 14:23:56 EEST 2016
#5900: alsa/pulse grab cuts last 2 seconds of audio
-------------------------------------+-------------------------------------
Reporter: tsg1zzn | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: screencast, | Blocked By:
sound | Reproduced by developer: 0
Blocking: |
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
I have spent probably 10 hours trying to record the screen _losslessly_ in
linux, and I simply cannot get it to work.
The commandline in the wiki for this is wrong, it does a lossy conversion
rgb->yuv. Someone should note this and give a lossless option.
Currently I am pretty close, but the sound cuts 2 seconds before the end
of the recorded file.
How to reproduce:
{{{
$ ffmpeg -thread_queue_size 2048 -f alsa -i pulse -f x11grab -s 1280x720
-i :0 -acodec libvorbis -ab 256k -vcodec libx264rgb -r 30 -pix_fmt rgb24
"file $(date --rfc-3339=seconds).mkv" -report
^C
}}}
ffprobe shows the video stream and audio stream durations resp. like this:
DURATION : 00:00:07.103000000
DURATION : 00:00:05.399000000
Attached: ffmpeg -report
Attached: ffprobe output
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5900>
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