Can anyone recommend an editor to do this? Basically I want to combine pieces of two videos but keep the original encoding in the output. I know you can edit a single file with Avidemux and not change the original encoding but that's not adequate in my case.
Thanks for any help.
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Did you mean composite multiple tracks and layers ? If so , it's not possible without re-encoding
If you meant end to end, ie. appending videos as-is in a single track, but +/- multiple audio tracks then it's possible -
I may have misstated my requirement; I just mean two videos where each has just one video and audio track. For example, insert a short clip in the middle of a long one. I already use Blender for this kind of stuff but why can't it be combined without re-encoding if both files were encoded identically? It's basically just splitting and joining multiple times which could probably be done using a cumbersome script.
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Basically you're asking to append 3 videos -
This is discussed frequently in other threads.
The short version is you need to cut on keyframes ( GOP boundaries) then join them. If you need frame accuracy (if where you want to cut does not occur on a keyframe), then you need to re-encode the few frames around a cutsite up to the next keyframe - this is known as "smart rendering" . Some programs that can do this are videoredo, tmpgenc smart renderer, solveigmm video splitter -
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What type of video ?
There are NLE's that can do this, mix/match and only render frames that involve effects/ transitions , other frames are stream copied or passed through untouched - but it's more source format dependent
e.g most professional NLE' s can do it with I-frame formats such as DV, DNxHR, DNxHD, AVC-Intra. Vegas can do it with some times of MPEG2 including long GOP XDCam . FCP/FCPX can do it with prores, same with the mac version of Premiere.
If you're using generic long GOP AVC or HEVC, none will proper have smart rendering support , or they will be very buggy. e.g. PowerDirector claims to be able to do it with SRVT, but it's very buggy and frames get glitched or mixed up -
why can't it be combined without re-encoding if both files were encoded identically?
1. Segment Must start with an 'I' frame and end with a 'P' frame if a segment is joined at the end.
2. Timing at the end must be consistent, i.e. The last few frames of 0.04ms for 25fps should have 0.04ms between each otherwise a glitch is introduced
as 0.04 - 0.04 - 0.08. Videos like these are caused by many programs (FFMpeg or FFMpeg based) that cut at a 'B' frame and introduce a 'P' frame with
the duration time equal to the missing 'B' frames in the original before the actual original ending 'P' frame.
[Attachment 54920 - Click to enlarge]
[Attachment 54921 - Click to enlarge]
3. Audio time of all segments must be almost equal to the video or a 'Freeze' frame with be shown at the join point.
[Attachment 54922 - Click to enlarge]
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