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eca82eee4a
This is an attempt to improve video performance when encoding does not keep up with frames. This situation can be reproduced by running multiple encoders at the same time. Added `utils/video_stress.js` to manually reproduce this issue. Observing ffmpeg logs, it does not do any encoding initially and instead does "input analysis / probing" that detects fps and other parameters. By the time it starts encoding (launches vpx and creates the video file), we already have many frames in the buffer. Reducing probing helps: `-avioflags direct -fpsprobesize 0 -probesize 32 -analyzeduration 0` Another issue observed is questionable default `-threads` value. We compile without threads support, so logs say "using emulated threads". For some reason, setting explicit `-threads 1` (or any other value) makes it better when cpu is loaded.