|hFile||Specifies the mp4 file to which the operation applies.|
|index||Specifies which track is desired from matching tracks.|
|type||Specifies the type of track to be matched. A NULL value implies any type of track. See MP4GetTrackType() for predefined values.|
|Specifies the subtype of the track to be matched. Subtypes are only defined for audio and video tracks, see MP4GetAudioTrackType() and MP4GetVideoTrackType() for predefined values. A zero value implies any subtype.|
Upon success, the track id of the specified track. Upon an error, MP4_INVALID_TRACK_ID.
MP4FindTrackId gets the track id associated with the indexth track of the specified track type. For example, to get the track id of the first video track:
MP4FindTrackId(hFile, 0, MP4_VIDEO_TRACK_TYPE);
For audio and video tracks, a subtype can be specified to find a track of a particular encoding. For example, to get the track id of the first audio track encoded with MPEG-1 audio:
MP4FindTrackId(hFile, 0, MP4_AUDIO_TRACK_TYPE, MP4_MPEG1_AUDIO_TYPE);
Caveat: The track ids do not imply anything about the ordering of the track information within the mp4 file.
|Cisco Systems Inc.||MP4 (3)||Version 0.9|