
There are two ways to write editable tracks samples. 1. In the embedded edit data MP4. 2. Interleaved with primary tracks samples. Initial plan was to support only option 1 but then the decision is to support both ways. To identify between these two an additional key will be required. Option 2 is yet to be implemented in Mp4Muxer. PiperOrigin-RevId: 658791214
Test data module
Provides sample data for media unit and instrumentation tests.