FFmpeg video split frame missing

[mrahmet]

I got a problem with ffmpeg video cutting. Videos not cut properly. 1 second between the first and second video is lost. Shred files from different servers to handle. Processed want to merge the files again. I know very little english.


part1.avi split code:

ffmpeg -i input.avi -ss 00:00:00 -t 00:01:00 -vcodec copy -acodec copy part1.avi

part2.avi split code

ffmpeg -i input.avi -ss 00:01:00 -t 00:01:00 -vcodec copy -acodec copy part2.avi

ffmpeg -i part1.avi = 00:01:00.02

ffmpeg -i part2.avi = 00:01:00.02


Part1 console output:tny.cz/ebf2cc00
Part2 console output:tny.cz/f1076518
Part1 mediainfo(mplayer):tny.cz/d34a2cf9
Part2 mediainfo(mplayer):tny.cz/bf4b56b4

[poisondeathray]

ffmpeg can only cut on keyframes (I-frames) .

So if your source xvid video used typical settings, that might be anywhere from 1-300 frames accuracy (that's the typical GOP size) . For a 24p framerate that is 0-12.5 seconds accuracy

Tools like vdub, avidemux can smart render xvid (meaning they re-encode the frames inbetween I-frames if you cut within a GOP, not at the end of a GOP, directly preceding an I-frame), so they are frame accurate, but it's more difficult to batch process . They do have CLI interface options, but not sure how to do it with them

[mrahmet]

ffmpeg can only cut on keyframes (I-frames) .

So if your source xvid video used typical settings, that might be anywhere from 1-300 frames accuracy (that's the typical GOP size) . For a 24p framerate that is 0-12.5 seconds accuracy

Tools like vdub, avidemux can smart render xvid (meaning they re-encode the frames inbetween I-frames if you cut within a GOP, not at the end of a GOP, directly preceding an I-frame), so they are frame accurate, but it's more difficult to batch process . They do have CLI interface options, but not sure how to do it with them

Thank you. must follow a guide on how to ffmpeg?