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> The cuts are usually slightly off from where I'd ideally like them to be That is (probably) because the editor uses certain marks in the video (I don't remem

by ericol 4y ago

> The cuts are usually slightly off from where I'd ideally like them to be That is (probably) because the editor uses certain marks in the video (I don't remember how they are called) that "group" the frames together, and you can't use simple editors to re encode the video. I had this issue some time I tried to cut videos from my gf. Then I moved to ShotCut, that cuts the videos exactly where you want, although the walkthrough is a little longer.

TreeRingCounter 4y ago
CharlesW 4y ago
> …the editor uses certain marks in the video (I don't remember how they are called) that "group" the frames together… You almost had it! https://en.wikipedia.org/wiki/Group_of_pictures https://en.wikipedia.org/wiki/Group_of_pictures
xienze 4y ago
Right, it will (by default) align the cut to the nearest I frame, which allows the cut to be "lossless." Doing the cut anywhere else requires re-encoding part of the video.
QuantumGood 4y ago
But ShotCut isn't lossless, is it? e.g "“lossless” in Shotcut export does not imply the image goes through the engine untouched. It simply means that the codec is lossless or in lossless mode. The engine does not support every pixel format and color space in existence – only a few. Often sources get converted going through the engine. In your case, the source is RGB, but the engine defaults to yuv422 unless it has an mlt_image_format specified in Export > Other. For your 6SrK4.mp4, you would need mlt_image_format=rgb24 Also, in order to avoid image changes, you must use a Video Mode that matches the source and must not use any effecs (multiple video tracks, transitions, filters). (A mismatching video mode can cause automatic deinterlace, colorspace conversion, scaling, and padding)." –source: https://forum.shotcut.org/t/lossless-annoyances/18344 https://forum.shotcut.org/t/lossless-annoyances/18344

by ericol 4y ago

TreeRingCounter 4y ago

CharlesW 4y ago

> …the editor uses certain marks in the video (I don't remember how they are called) that "group" the frames together… You almost had it! https://en.wikipedia.org/wiki/Group_of_pictures https://en.wikipedia.org/wiki/Group_of_pictures

xienze 4y ago

Right, it will (by default) align the cut to the nearest I frame, which allows the cut to be "lossless." Doing the cut anywhere else requires re-encoding part of the video.

QuantumGood 4y ago

But ShotCut isn't lossless, is it? e.g "“lossless” in Shotcut export does not imply the image goes through the engine untouched. It simply means that the codec is lossless or in lossless mode. The engine does not support every pixel format and color space in existence – only a few. Often sources get converted going through the engine. In your case, the source is RGB, but the engine defaults to yuv422 unless it has an mlt_image_format specified in Export > Other. For your 6SrK4.mp4, you would need mlt_image_format=rgb24 Also, in order to avoid image changes, you must use a Video Mode that matches the source and must not use any effecs (multiple video tracks, transitions, filters). (A mismatching video mode can cause automatic deinterlace, colorspace conversion, scaling, and padding)." –source: https://forum.shotcut.org/t/lossless-annoyances/18344 https://forum.shotcut.org/t/lossless-annoyances/18344