hey, if i wanted to add a short 30-second clip to an hour-long video encoded in h.264...
is there a way to do that without spending 80 minutes exporting the whole entire video in Premiere all over again?
asking for a friend 
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i'm actually 90% done now - i've got two files (one 0:49:35 long, another 0:04:12 long) that i need to concatenate. i wanna use avidemux, but it seems like avidemux outputs files as .MKV, which YouTube can't take... what should i do next? (thanks for yall's help btw!!)
(i'm sliding in an extra 30-second clip near the end but BEFORE the annotation end slate, so it's sadly not just straightforward concatenation)
shit, actually - i found the avidemux setting to use the mp4 muxer. was terrified it would just recompress the entire thing, but it's going lightning fast... i think we're okay...?!?pic.twitter.com/zrP8b0wXyF
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If you need to transform between mkv and mp4 without a reencode that one is a simple ffmpeg command at least `ffmpeg -i filename.mkv -vcodec copy -acodec copy 1.mp4`
End of conversation
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Check the final product for multiple encoding artifacts during quick transitions and/or smoke/etc... but if you’re not getting anything than I’d say we’re ready to not know what time it is.
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Avidemux crapped out at the 11th hour on the export - i'm gonna try one more time using the MKV muxer, check the final product to make sure it didn't re-encode, and then just surrender if that fails
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