Someone probably wondered whether the length of the SCART cable matters.
I used good Tech+link WiresCR cables to check.
0.5m - flat
1m - standard
MP4 files attached.
The last file is a comparison:
- top row: 0.5m and 1m with highly enhanced contrast
- bottom row: 0.5m and 1m unchanged
Everything was captured to the H265 codec with a 12mbit bit rate (yes, I know, lossless would be better), and then recompressed to H264 with CRF 17.
The difference can be seen in the size of the H264 file - for a 0.5m cable the file is 10% larger, which would mean a higher noise level.
Maybe someone will find it useful
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Length and screening/shielding basically matters, yes.
Not sure about your case though: Maybe noise, maybe different dotcrawl, maybe the non-deterministic encoder .... ?
Some observations:
The bitrate diverges increasingly over time between the tests
I,P,B frames were allocated differently
x264 has a setting for 'deterministic encoding' (or similar, I don't remember now). Try the deterministic setting.
Was the environment the same? Has an electric appliance been switched on/off between or during the tests, causing noise?Last edited by Sharc; 17th Apr 2024 at 09:06.
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Capturing 10 minutes with a 0.5 m cable, turning off the equipment and changing the cable, Recording 10 minutes with a 1 m cable, then selecting 1 minute from the middle of the recordings and recompressing the source from H265 to H264.
The only downside is the use of ffms2. Only LWLibavVideoSource handles VFR correctly, ffms2 loses 1 frame per 20000 frames. -
Use good cables - i have 20 meter long VGA cables and VGA signal bandwidth is at least twice higher than SCART (usually way more than twice).
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