0acf6902e5
As per MP4 spec ISO 14496-12: 8.7.5 Chunk Offset Box, Both "stco" and "co64" can be used to store chunk offsets. While "stco" supports 32-bit offsets, "co64" supports 64-bit offsets. In non fragmented MP4, the mdat box can be extremely large, hence muxer uses "co64" box. But for fragmented MP4, muxer does not write any data in this chunk offset box (present in "moov" box) because all sample related info is present in "moof" box. Technically, "co64" box should also work in fragmented MP4because its empty only but QuickTime player fails to play video if "co64" box is present in fragmented MP4 output file. Testing: Verified that QuickTime player does not play video when "co64" box is present but is able to play when "stco" box is present. #minor-release PiperOrigin-RevId: 601147046
Muxer module
Provides functionality for producing media container files.
Getting the module
The easiest way to get the module is to add it as a gradle dependency:
implementation 'androidx.media3:media3-muxer:1.X.X'
where 1.X.X is the version, which must match the version of the other media
modules being used.
Alternatively, you can clone this GitHub project and depend on the module locally. Instructions for doing this can be found in the top level README.