Avidemux Message

[Jay123210599]

Does Avidemux use FFmpeg for remuxing and cutting videos without reencoding them? Does it also tell me when and if I have to reencode the video so it can precisely cut frame by frame without using keyframes? If not, it otherwise just cuts losslessly regardless of frame?

[DB83]

Avidemux does not use ffmpeg for encoding. It uses a built-in libavcodec.

If you are cutting/trimming with 'copy' selected, you MUST cut at a keyframe/iframe otherwise any video before the next iframe will be corrupt.


If you do not have 'copy' selected you can choose any frame but the whole video is re-encoded.


There are no messages within the program as far as I am aware.

[jagabo]

AviDemux shows you the frame type at the bottom of the window:


[Attachment 74558 - Click to enlarge]

It will show I, B, or P.

[Secoast]

If you make a selection (that is not on keyframes) and save in copy mode (no reencoding), Avidemux will automatically trim to the nearest keyframes without informing you.
This isn't quite true, because whilst your selection must always start on a keyframe, you can often end on an intermediate frame.

If you trim/delete a section from the middle of a stream that is not on keyframes (whilst in copy mode), Avidemux will warn you that errors are likely in the exported video.

Edit....The above occurs even with alerts enabled.

[butterw]

Newer versions always start the cut on keyframe in Copy mode.

There are warning messages, unless disabled.

[Jay123210599]

But Avidemux does use FFmpeg for remuxing and cutting videos without reencoding them, right? How do I activate the warning messages?

[butterw]

No. Avidemux has it's own demuxers/muxers, the cutting isn't done by ffmpeg.

You set Copy mode if you don't want to reencode, it will always cut starting on a keyframe. What is there to warn about ?

[Jay123210599]

No. Avidemux has it's own demuxers/muxers, the cutting isn't done by ffmpeg.

You set Copy mode if you don't want to reencode, it will always cut starting on a keyframe. What is there to warn about ?

But Shutter Encoder and LosslessCut does use FFmpeg for those things?

[Secoast]

But Avidemux does use FFmpeg for remuxing and cutting videos without reencoding them, right?

https://www.avidemux.org/admWiki/doku.php?id=general:common_myths

[Secoast]

How do I activate the warning messages?

Edit/Preferences/User Interface/Message level