Lossless video cut/trim/splice (stretch goal - subtitles?)

[Someone7272]

Sorry if it's a silly question.

I would like to find out if it can do lossless cut/trim/splice of video files (specifically MP4 AVC H.264).
This only includes files encoded by the same encoder and settings, I wouldn't be splicing streams from multiple different encoded sources.
For example, take a single H.264 encoded MP4 file, cut parts out, then join it all up again without re-encoding. I'm aware that H.264 can only be cut/trimmed/joined at keyframe intervals due to the way it's encoded.

I have already tried (and struggled with) several open source softwares:

• LosslessCut, but I couldn't get it to work.
• Avidemux, it did do a good job with cutting/trimming, but it couldn't join files.
• FFmpeg, it's all command line, and I'm not pro enough for that.

A simple interface that can do this without re-encoding is what I'm looking for.

And now for my stretch goal - not a dealbreaker, but I'll ask anyway:
Togglable subtitle/CC streams (not part of the video image).
Fully formatted (custom positioning, font color etc.) formats include "Line 21"/CEA-608 and VTT. Not counting the garbage (but for some strange reason, widely used) SubRip/SRT format, because it has no formatting possibility. Or if it does, support varies by vendor due to poor standards enforcement.
There are others, but it's not clear what formats are allowed on iOS devices, I'm still researching this.

Thanks,
Dan

[Spoon]

Sorry we do not support lossless splicing.

[Someone7272]

Sorry we do not support lossless splicing.

Aw damn, thanks for confirming. Maybe it's just not possible yet, at least - not with H.264.
Hopefully H.265 will change this...