Avidemux cutting

[techmot]

Anyone know why Avidemux will cut at random points in a video file (an MP4 at 30fps from my Samsung camera), yet isn't Avidemux only meant to cut at keyframes?. If it will cut anywhere on a video file then why, when I import a video that has been captured from an analogue source it won't cut and remux the file where it says it's not on a keyframe? yet the MP4 file I mentioned it seemed to cut at any point in the video even when there was no cut or keyframe cut. Also, when I exported the edited file and saved as an MP4 remuxed file, the outputted file read "30.1fps". Why is the outputted file reading 30.1fps and not 30fps?.

[sipho]

You're not really giving enough information. What exactly are you trying to do with Avidemux? You have to cut on a key-frame at the beginning of the video or else you'll get corruption. If you cut at the end you don't have to use a key-frame.

[techmot]

You're not really giving enough information. What exactly are you trying to do with Avidemux? You have to cut on a key-frame at the beginning of the video or else you'll get corruption. If you cut at the end you don't have to use a key-frame.

I was cutting in the middle of the video at a random point. It was one continuous video playing for about 5 mins and I was cutting it down to about 2 minutes.

[Secoast]

You have to cut on a key-frame at the beginning of the video or else you'll get corruption. If you cut at the end you don't have to use a key-frame.

Not quite correct. Frame seeking can be both backwards, and forwards. However, it is mostly backwards. Also, not all frames being referenced are keyframes. Generally speaking, you must always start on a keyframe, but you can often (not always) end on an intermediate frame, even if it is not the exact frame you selected.

Different files have different keyframe intervals, and as such will produce different results. Comparing the behavior of one file to another, particularly when they are not the same format, is misguided. The behavior of one is not relevant to the behavior of another.

The above assumes you are cutting in copy mode.

[blud7]

You can cut anywhere (without keyframe) if you are re-encoding.
Otherwise if you are just splitting the video (no re-encode) you need cut at a keyframe.

[techmot]

You can cut anywhere (without keyframe) if you are re-encoding.
Otherwise if you are just splitting the video (no re-encode) you need cut at a keyframe.

I have been able to cut in the middle of a particular video from one of my analogue captured videos, but if I try and cut where one scene ends and another begins (ie when the tape stopped recording and then resumed - though with analogue recorded videos there was always some kind of interfering from the tape and not a straight cut like with digital video recording would produce), Avidemux will say it can't cut because it's not on a keyframe. And why does the file outputted at 30.1fps and not 30fps even when I used copy mode?.

[butterw]

If you are using a semi-recent Avidemux: in copy mode, it always cuts starting on a keyframe.

[techmot]

If you are using a semi-recent Avidemux: in copy mode, it always cuts starting on a keyframe.

I just downloaded the recent version from this site.