• Compression Techniques

  How to get ffmpeg/x264 to use same parameters as input?

  Posted by Gyan Doshi on November 11, 2014 at 5:32 am

  I’m trying to accomplish a smart rendering workflow using ffmpeg/x264, which goes like this: get ffmpeg to segment the input file at keyframes. Locate the segment(s) with changes to be made. Re-encode altered segments with same parameters as source. Concatenate altered + original segments.

  Problem: the resulting video turns garbage when it first traverses from an original to altered segment or vice-versa. Most likely, because the altered chunks and original chunks differ in some bitstream parameters, or possibly some GOP boundary issues are at play.

  I’ve provided an illustration at https://ffmpeg.gusari.org/viewtopic.php?f=11&t=1793

  So,

  1) is there a way to tell ffmpeg/x264 to generate a concat-with-source-compliant output?

  2)If it’s GOP related, what do I look for in the source and what do I tell the encoder?

  Thanks,

  Gyan

  Gyan Doshi replied 11 years, 7 months ago 1 Member · 0 Replies
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