mirror of
https://github.com/androidx/media.git
synced 2025-04-30 06:46:50 +08:00
ecb0024a0b
- Added logic to parse media duration from the `mdhd` box for accurate frame rate calculation. - Fallbacks to track duration from `tkhd` when `mdhd` contains invalid or missing data. - Avoids incorrect frame rate calculations in MP4 files with an edit list (`elst`) box. - Adds frame rate calculations for partially fragmented MP4 files. - Verified accuracy with tools like `mediainfo` and `ffprobe`. Issue: androidx/media#1531 **Note**: The slight difference in frame rate values in dump files that aren’t MP4s with an edit list or fragmented MP4s isn’t due to differences in `tkhd` and `mdhd` duration values (which should be identical for non-edited or non-fragmented files). Rather, it’s because they are calculated using different timescales. The `mvhd` box defines a global movie timescale, which is used for the track's `tkhd` duration. Meanwhile, each track’s `mdhd` box defines its own timescale specific to its content type, which we now use for more accurate frame rate calculation. PiperOrigin-RevId: 676046744
Test data module
Provides sample data for media unit and instrumentation tests.