MP4 tag information lost after output

[V-Toll]

Hey! Thanks for the great app. I love the minimalistic design and the overall speed.
I just have a problem with some lost tag information in mp4 files. Thinks like cover, publisher, etc. get lost after cutting a mp4 file.

Here you see the original tag information in the mp4 file, created via MusicBrainz Picard:

And after putting it through LosslessCut the following happens:

I didn't test ist with any other video file formats.
I hope this get's fixed sometime in the near feature. Thanks!

[mifi]

LosslessCut offloads all this conversion to ffmpeg, so we need to figure out how to make ffmpeg do this. Seems like ffmpeg has an option -map_metadata
If you can try with ffmpeg and confirm this works, then I could add an option for preserving metadata. (maybe not safe to do it by default)

See also:
https://ffmpeg.org/ffmpeg.html

[V-Toll]

Hey, this seems to work for me. Any chance of getting this function as an additional option?

[mifi]

What do you mean works for you? where does it work for you?

[V-Toll]

Sorry, it's been a while ;-)

I tried the -map_metadata option with ffmpeg and all metadata was saved.

[mifi]

Which arguments are you using for -map_metadata?

Looking at ffmpeg docs, it seems that global metadata is copied by default. is not MP4 tag information global metadata?

By default, global metadata is copied from the first input file, per-stream and per-chapter metadata is copied along with streams/chapters. These default mappings are disabled by creating any mapping of the relevant type. A negative file index can be used to create a dummy mapping that just disables automatic copying.

[mifi]

I have added -map_metadata 0 and it seems to be working. 61a13ce