Hello,
I am having repeated issues when reversing clips in my project timeline. It is happening with multiple projects all using different source material, so it’s not one isolated incident with a single wonky file.
I take a small clip in my timeline and copy/paste it next to itself. I then want to reverse the copied clip, so that when they’re both played together it creates a “back and forth loop.” That part I have no problems with. The reversed copy, however is always different in appearance; shifts in white balance, contrast, color and skin tones. Obviously when played together with its counterpart, there is a sudden and jarring shift in overall appearance.
I ran a controlled experiment of sorts to try and figure this out on my own. The source video is 2160p 25fps and the default info in “Properties” when I load it into Shotcut are:
- Codec: H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
- Format: yuv420p
- Color Space: ITU-R BT.709
- Color Transfer: NA
- Color Range: Broadcast Limited (MPEG)
I added the video to my timeline, then cut out a 10-second clip and made five copies of it to try the following. All reverse conversions were done using the “Best” method.
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Clip 1: Original clip
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Clip 2: Reversed, Convert to BT.709 OFF
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Clip 3: Reversed, Convert to BT.709 ON
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Clip 4: Color Range changed to “Full (JPG)”
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Clip 5: Reversed, Convert to BT.709 OFF
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Clip 6: Reversed, Convert to BT.709 ON
Results were that clips 2-6 all had the same appearance, which was different than Clip 1. The most noticeable change was a shift toward cooler blue in overall color tone. The histogram for clip 1 fluctuated between 0 and 6 for a minimum. Clips 2-6 all bounced around between 16 and 22.
Version 25.01.25
Mac OS 15.2 Sequoia