All other settings for the pre-edited export can stay the same.Ī video at 7x speed sounds a lot like a time lapse. This reduces double-degradation by the time these clips hit the final export. Since the pre-edited video is going to be re-encoded again for the final export, it helps to have higher-than-usual quality settings for the pre-edited video, such as 68% quality (CRF 16). And a Canon camera doesn’t have any better formats than what you’re already using unless it’s a newer RF-mount model, or an external recorder is used. There isn’t much we can do about this because we would have to change the format written by the Canon camera itself in order to improve decode time further. This only makes the pre-edited video faster to work with on the final timeline. These changes probably won’t speed up the export of the pre-edited video. Note this will create a noticeably larger file. If you want the pre-edited video to seek and playback and export on your final timeline even faster, then change GOP to 1 and B-frames to 0. This will make the exported file equally efficient to your Canon EOS clips, and probably around the same file size. If using H.264 for speed changes like you’re doing, it can be made more efficient to decode by going to the Export tab > Advanced button > Codec tab, then change GOP to 30 and B-frames to 0. You’re free to use other formats or fancy settings up until the final export. Device compatibility isn’t a concern at this point of the process because only your computer sees the pre-edited video format. I’m sure that this is the reason why the file-size, and hence processing time, does not decrease linearly with the speedup. So even though you are throwing away 4 fifths of the frames for 5x and 9 tenths of the frames for 10x, the frames that you do process are a lot different from each other consecutively, hence a lot more compression needs to be done. In 10x the changes between consecutive frames would be huge (h), as you would actually be comparing the 1st I-frame with the 3rd I-frame etc… (F=full frame processing) Frame 0 1 2 3 4 5 6 7 8 9 10 In 5x the changes between consecutive frames would be large (l), as you would actually be comparing the 1st I-frame with the 2nd I-frame etc. 1 I-frame followed by 4 B-frames then in 1x speed the changes from frame to frame would be small (s), hence a small amount of processing. It the original video had a GOP that looked something like that shown in the “GOP row below” i.e. I suspect it is I-frame and B-frame processing.
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