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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Personal opinion still: you’ll spend more than 80 minutes figuring out the ffmpeg command to do it, once you do if your encoding settings put much timing info into the file ffmpeg will just reencode anyway (all premiere encoder / media encoder is is a wrapper around ffmpeg)
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using avidemux GUI would avoid the need to know the ffmpeg command line,it also tells you which frames are I frames so you can just cut at the I frame and insert the desired clip without the need to reencode so it would be quicker,only limitation is needing to cut on the I frame
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damb. i guess i'll just opt for a full re-export, seems like the least painful option

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(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)