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Re: Converting mkv to Prores - Streamclip is duplicating frames

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Jeff Greenberg
Re: Converting mkv to Prores - Streamclip is duplicating frames
on May 15, 2013 at 2:24:04 pm

Sreekuma - it's because he has Perian installed.

Chris, I'd suggest just getting the h.264 content out of the mkv container. There's a utility I haven't used in a while called MKVtools (and MP4 tools) that should let you copy the h.264 into a different container (rather than re-encoding it.)

MPEG Streamclip is using Perian (built on FFMPEG) to handle the media. The problem is that Perian is dead...and the MKV container wasn't ever really meant for anything other than distribution.

>Is it a timecode or drop frame issue?

Perhaps - the person who encoded it (or their encoder) may have incorrectly encoded the frame rate. And it's the frame rate interpretation that's an issue (I believe). An easy way to test it would be to take a section and output it as a series of stills. Depending on what happens you can tell if it's duplicating frames.

So, I'll ask: where did you get the MKV files, can you get the originals and what was the original encoder software?

Best,

Jeff I. Greenberg
Author/Master Instructor/Speaker/Consulting
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