#8377: Using kmsgrab + h264_vaapi with audio causes stutter
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Reporter: asineth | Owner:
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Changes (by 0x53ee71ebe11e):
* version: unspecified => git-master
Comment:
I have the very same problem. I added a short video demonstrating the
stuttering. If you step through the video frame by frame, you can see that
the frames are in an incorrect order. The stuttering only happens when
also recording audio.
Ubuntu 19.10
kernel 5.6.7-050607-generic
gpu: RX 5600 XT
gpu drivers from https://launchpad.net/~oibaf/+archive/ubuntu/graphics-
drivers
ffmpeg from git master
$HOME/ffmpeg/ffmpeg \
-v 9 -loglevel 99 \
-threads 8 \
-thread_queue_size 512 \
-f kmsgrab -framerate 59.4 -i - \
-f pulse -i default \
-map 0 \
-map 1 \
-vf 'hwmap=derive_device=vaapi,scale_vaapi=1920:1080:nv12' -c:v
h264_vaapi -qp 40 \
-c:a libmp3lame -ab 128k \
-t 2 \
/tmp/output.mp4 >/tmp/ffmpeglog.txt 2>&1
video and debug output added as attachment
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8377#comment:5>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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