When opened with avidemux2.6, the file begin with a I-Frame at time 0:00.00.400 Quote from: eumagga0x2a on June 22, 2017, 11:47:18 AMįor more in-depth analysis of a particular case: please provide a sample with steps to reproduce.Īs requested, I ve provided a sample of what I am trying to do and what doesn't work like I would like. Unfortunately, I already deleted the file that could be used for testing. But if anyone else had such a problem, it's interesting if it's a bug in Avidemux selection routines or in the codec or what. I don't know what was wrong with it because it was an ordinary I-frame somewhere in the middle of the video and the source video was generated by Avidemux and could be played with MPC-HC without corruption. I've cut many files that day without such problems and saw this problem only once in one I-frame, but it could be repeated as many times as I tried. It seems there are rare faulty I-frames that make Avidemux go mad. I have no idea why that happened exactly in that place, but it's not the first time when I notice this problem. Finally I gave up and moved the marker to the previous I-frame and the selection was saved without corruption from the first try. I thought it was a bug in 2.7 and installed 2.6, repeated exactly the same selection and got the same result. This is why I decided that the first I-frame was not saved. MPC-HC didn't want to open the resulting file saying it was corrupted and some players allowed to play it showing the corruption from the beginning to the second I-frame. The saved selection lacked the initial I-frame (that was "kind of" selected in Avidemux). First I thought I made some mistake with the selection and tried again, but got the same result. In most cases, if I move the marker with UP/DN keys to I-frames, the cropping is made correctly, but in one case it was made wrong. Then I decided to divide these videos into sections and I found a strange thing. A couple of days ago I converted many videos of my bike trips in Avidemux into MP4, H264, rate factor 29, "super fast" preset. The start point of every segment must be an intra (I-frame). The end point of every segment (if you save from A to B, then B if you delete from A to B, then A) may be a P-frame (in most cases this will work), but with I-frames you are on safe ground (unless a bug in software steps into action -)).
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