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Re: Problem with beginning of 2-pass encoded video

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Michael Rampe
Re: Problem with beginning of 2-pass encoded video
on Jul 4, 2011 at 10:42:12 pm

[William Lipinski] "Can anyone diagnose the cause of this problem at the beginning of the first video? I would love to switch to 2-pass, but I'm stuck on single-pass until I find out what I'm doing wrong."

I have also experienced this. My advice would be to use 1pass encoding with -crf rate control. This is AS GOOD as a 2pass encode using -b rate control. As you are going to youtube and do not have to deliver a set bitrate, this would be your best option. In libx264, -crf ranges from 1 (best) to 51 (poorest). Do some experimentation to find the best results for your needs.

If you really are dead set on the -b rate control, try experimenting with different values for -g. This represents the GOP size and smaller values might be another solution to the youtube wierdness.

Michael


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