Has anybody noticed conversions getting slower over time?

[iragsdale]

Hi, I'm curious if other people are experiencing this. I''m using Ffmpeg.wasm to convert a recording in Chrome from webm to mp4 (I think without changing the encoded data, my command looks like ffmpeg.exec(['-i input.webm' '-threads', '4', 'output.mp4']).

On Chrome, I'm watching the progress and it starts really fast - the progress updates say it's doing 50+ fps, but it starts getting slower the longer it processes. On a short clip it stays up well into double digits, on longer clips it just gets slower & slower until it's doing single digit frames per second, so longer clips are way way slower than short clips. (As in a 60 second clip takes significantly more than twice as long than a 30 second clip).

Has anybody else seen this? Any suggestions?

[studio4evr]

did you ever figure this out? i'm getting same thing