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alexVS · 19th November 2011, 19:19

Trying to cut several fragments from AVC-h264-720p video. DSS2() opening filter works fine, but when I use trim function, about 10 first frames go with artifacts.

v1=DSS2("video.mkv",FPS=25)
v2=v1.trim(12345,23456)++v1(34567,45678)
return v2

I understand that frames 12345 and 34567 are not keyframes, but p or b frames, so directshow codec produces 12345-12355 frames (or so) incorrectly (with artifacts) and next frames go all right. The same is with the second fragment starting from frame 34567.

Is there a solution to this?

[small]When clip is small, I can write it uncompressed with lagarith or huffyuv from start through, then work with any frame, but it's not convenient with large files and take more time[/small]

19th November 2011, 19:19	#1 \| Link
alexVS Registered User Join Date: Sep 2004 Posts: 147	Correct opening HD AVC with Avisynth Trying to cut several fragments from AVC-h264-720p video. DSS2() opening filter works fine, but when I use trim function, about 10 first frames go with artifacts. v1=DSS2("video.mkv",FPS=25) v2=v1.trim(12345,23456)++v1(34567,45678) return v2 I understand that frames 12345 and 34567 are not keyframes, but p or b frames, so directshow codec produces 12345-12355 frames (or so) incorrectly (with artifacts) and next frames go all right. The same is with the second fragment starting from frame 34567. Is there a solution to this? [small]When clip is small, I can write it uncompressed with lagarith or huffyuv from start through, then work with any frame, but it's not convenient with large files and take more time[/small]