Add support for MPEG-4 Part 2 video codec (ISO 14496-2).

[dreamaniajp]

Hi,
Since current mp4parse-rust doesn't handle MPEG-4 Part 2 video codec(video/mp4v-es, ISO 14496-2),
I tried to add some codes for it.

Is there any concern that I would like to file a pull request to enable it?
And which branch should I work on? master?

Thanks a lot!

[baumanj]

It's fine if you want to submit a PR for adding this support. Just put it behind a feature flag, as we did with the 3gpp work. When accepted, it will merge into master, but that shouldn't matter for where you do your work. When submitting the PR, it should be as a diff against mozilla:master.

[dreamaniajp]

I created a PR#296 for this.
I use "mp4v" as the feature flag.

Many thanks!!