MP4 Edit List

[Lupurus]

Hi,
I'm trying to trim some mp4-videos with Quicktime in Mac OS. These files include the h264-codec, so it's great to trim them this way, because a new encoding is not necessary anymore. BUT:
If I trim between two keyframes, Quicktime adds an EditListEntry into the mp4-file. So this should tell the player: Don't play the GOP-part before the cut. Quicktime itself plays those files great, but not VLC. There I'm getting worse artefacts.
Is this a bug or a missed feature? Any chance to add this option? Would be great, because it would make Software with 'Smart Rendering' obsolete.

[Jean-Baptiste Kempf]

Missing feature. But seriously, we are bored of implementing QuickTime undocumented extensions to the mp4 format.

[Lupurus]

Thanks for your answer!

Is this maybe the right documentation? https://developer.apple.com/library/mac ... 4-BBCCFBEF (search for Edit List Atoms)

[Jean-Baptiste Kempf]

Probably. Patches welcome.

[craigpratt]

To be fair, the MP4 Edit List Box is defined as part of ISO/IEC 14496-12 (the MP4/ISO base media file format specification).

I can't say if Apple is using it in strange ways. But DLNA CVP-2 requires its presence in some cases. (which is why I've stumbled into this thread...)

[Jean-Baptiste Kempf]

Patches still welcome