ffmpeg crash when transcoding with vpp_qsv and pad filters

[applemax82]

Summary of the bug:
How to reproduce:

% ffmpeg -hwaccel qsv -c:v h264_qsv -i football_avc_600p_24fps_1000k.flv -an -c:v h264_qsv -r 15/1 -vb 1000000 -minrate 1000000 -maxrate 1500000 -bufsize 2000000 -preset fast -profile:v main -vf "vpp_qsv, pad='1280:720:128:64'" -f flv football_avc_600p_24fps_1000k_output.flv
ffmpeg 4.0.1
built on ...

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.

[Carl Eugen Hoyos]

Please test current FFmpeg git head and provide the command line you tested together with the complete, uncut console output to make this a valid ticket.
And please see https://ffmpeg.org/bugreports.html for the necessary information for a crash report.

[applemax82]

I use the following command, and ffmpeg 4.0 will crash.

[Zhong,Li]

IIRC, vpp_qsv can't support pad, just support crop, so the "pad" here is a software filter, thus means you need to use hwdownload from video memory to system memory, but probably the performance is slow.

Please try:
ffmpeg -hwaccel qsv -c:v h264_qsv -i bbb_sunflower_1080p_30fps_normal_2000frames.h264 -an -c:v h264_qsv -r 15/1 -preset fast -profile:v main -vf "hwdownload, format=nv12, pad='1920:1080:128:64', hwupload=extra_hw_frames=64,format=qsv" -f flv avc_600p_24fps_1000k_output.flv