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Old 2nd December 2017, 12:56   #14541  |  Link
tebasuna51
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Cut all tracks of a container without recode (VideoReDo or similar can recode only boundaries) at a exact point need:

- The time point is a exact multiple of audio framelength. Here, with AC3 48 Khz, 8000 ms are 250 x 32 ms, then cut the first 250 frames.

- The time point is a exact multiple of video framelength. If video have 25 fps you can cut the first 8000 / 25 = 320 frames, but you need than the 321ª frame was a Keyframe.
With other fps or without a Keyframe at exact point you can't cut exactly without recode.
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Old 2nd December 2017, 13:10   #14542  |  Link
LigH
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But the problem of mtamimi here is not cutting at an arbitraty timecode. It is cutting at the audio frame where the channel layout changes. And it is knowing the position of that audio frame, not in milliseconds, but in audio frame number. And you already suggested SplitAc3 for this job. All is fine.
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Old 2nd December 2017, 13:45   #14543  |  Link
mtamimi
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Quote:
Originally Posted by tebasuna51 View Post
Cut all tracks of a container without recode (VideoReDo or similar can recode only boundaries) at a exact point need:

- The time point is a exact multiple of audio framelength. Here, with AC3 48 Khz, 8000 ms are 250 x 32 ms, then cut the first 250 frames.

- The time point is a exact multiple of video framelength. If video have 25 fps you can cut the first 8000 / 25 = 320 frames, but you need than the 321ª frame was a Keyframe.
With other fps or without a Keyframe at exact point you can't cut exactly without recode.
"VideoReDo or similar can recode only boundaries" << Does this make a difference?

"you can't cut exactly without recode."
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Old 2nd December 2017, 19:54   #14544  |  Link
tebasuna51
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Quote:
Originally Posted by mtamimi View Post
"VideoReDo or similar can recode only boundaries" << Does this make a difference?
Recode always lose quality, but it's the best choice if you need that cut.

If you need more info please open a thread in video subforum, is off topic here.
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Old 2nd December 2017, 20:14   #14545  |  Link
mtamimi
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Recode always lose quality, but it's the best choice if you need that cut.
Does not worth it. I prefer the 8s silence...
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Old 5th December 2017, 17:59   #14546  |  Link
ashlar42
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Is there any up to date GUI available?
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