[Feature] Segment Splitting

[Ichisich]

Most videos I re-encode are AVC Videos (MPEG-4 Part 10) and given, they were encoded with x264, their key-frames make for proper cutoff points already.
Thankfully, FFmpeg has an inbuilt segment muxer:
https://ffmpeg.org/ffmpeg-formats.html#segment_002c-stream_005fsegment_002c-ssegment

For example, I use the following line and use the output files in a batch folder for NEAV1E as a parallel encode:
ffmpeg -i input.mp4 -c copy -f segment split%d.mp4
No prior re-encode needed and, depending on the video, can be more reliable than even PySceneDetect.

Segment splitting would be a useful third splitting option for NEAV1E.

[Alkl58]

Thats equivalent to:

See:

NotEnoughAV1Encodes/NotEnoughAV1Encodes/Video/VideoSplitter.cs

Line 183 in 6415c86

ffmpegCommand += " -segment_time " + queueElement.ChunkLength.ToString() + " -f segment \"";

[Ichisich]

Nice, I assumed it only would change the encoder to utvideo and the sort and didn't bother touching it.
Additionaly, key frame segment splitting almost never results in equal chunks.

[Alkl58]

Technically you are correct, however it's mostly close enough (within a few seconds), so I didn't put it in a separate category.

[Ichisich]

Personally, I would rearrange it as third option and call it:
Splitting Mehtod: Key Frames

Neither the current arrangement, nor calling it segmenting, would be as expressive.