Yes, I always specified the FPS when importing the YUV. I was unaware it would take Y4M, so I may try going that route.
I think at some point I even tried throwing a framerate declaration on the YUV file during creation as well.
basically if I create a YUV file it'll come out as 23.98 fps. SVT will encode it as 23.98fps if I specify framerate as 24000/1001 IIRC
At that point I cannot get the IVF file muxed into a webm because ffmpeg would throw an error IIRC about invalid framerate.
I tried using mkvtoolnix (through the provided GUI) and it would always error out as well but not really give info on why it failed. I have only been able to successfully mux a file encoded by SVT when the framerate was a solid 23 or 24 fps.
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it's my day off, so I will prepare and do some more tests and post my workflow here so i can provide a better and more accurate picture.
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