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Motivation¶

See #68923

Acceptance criteria¶

• AC1: One worker runs with an external video encoder configured
• AC2: The configured external video encoder provides significantly smaller video files instead of the default ones
• AC3: The worker is not overstressed by the external video encoder, i.e. not more jobs failing or incompleting due to an overstressed worker

Suggestions¶

• DONE: Install ffmpeg on the worker -> done on imagetester
• DONE: Try to find a good encoder setting -> done with VP9 with ffmpeg -hide_banner -nostats -r 24 -f image2pipe -vcodec ppm -i - -pix_fmt yuv420p -c:v libvpx-vp9 -crf 35 -b:v 1500k -cpu-used 0, see https://progress.opensuse.org/issues/68923#note-17
• DONE: Check whether the resulting videos work (including seeking) -> imagetester works fine, e.g. following https://openqa.opensuse.org/admin/workers/41 we find jobs like https://openqa.opensuse.org/tests/1469967#downloads showing .webm instead of .ogv with size 2.8MB instead of 6.9MB on an older job in the same scenario running on a different machine recorded in .ogv , i.e. only 41% of the original size
• DONE: Monitor the CPU usage of ffmpeg e.g. via htop and also the overall performance of the worker, e.g. check for incomplete jobs due to performance issues. -> mkittler already did the original analysis and it was ok and no reports by users have been raised