A-PC anon # mkvinfo a.mp4
+ EBML head
|+ EBML version: 1
|+ EBML read version: 1
|+ EBML maximum ID length: 4
|+ EBML maximum size length: 8
|+ Doc type: matroska
|+ Doc type version: 4
|+ Doc type read version: 2
+ Segment, size unknown
|+ Seek head (subentries will be skipped)
|+ EbmlVoid (size: 164)
|+ Segment information
| + Timecode scale: 1000000
| + Muxing application: Lavf56.36.100
| + Writing application: Lavf56.36.100
| + Segment UID: 0x4a 0x70 0xe2 0x96 0x2d 0xd5 0x9a 0x3f 0xd0 0x9d 0x66 0x4f 0x72 0x0d 0xba 0xb1
| + Duration: 1293.060s (00:21:33.060)
|+ Segment tracks
| + A track
|  + Track number: 1 (track ID for mkvmerge & mkvextract: 0)
|  + Track UID: 1
|  + Lacing flag: 0
|  + Language: eng
|  + Codec ID: V_MPEG4/ISO/AVC
|  + Track type: video
|  + Default duration: 41.708ms (23.976 frames/fields per second for a video track)
|  + Video track
|   + Pixel width: 1280
|   + Pixel height: 720
|   + Display width: 1280
|   + Display height: 720
|  + CodecPrivate, length 92 (h.264 profile: High @L3.1)
| + A track
|  + Track number: 2 (track ID for mkvmerge & mkvextract: 1)
|  + Track UID: 2
|  + Lacing flag: 0
|  + Language: eng
|  + Codec ID: A_AAC
|  + Track type: audio
|  + Audio track
|   + Channels: 2
|   + Sampling frequency: 48000
|   + Bit depth: 32
|  + CodecPrivate, length 5
|+ Tags
| + Tag
|  + Targets
|  + Simple
|   + Name: PLEX.DURATION
|   + String: 1293.06
|  + Simple
|   + Name: PLEX.TOTAL_DURATION
|   + String: 1293.06
|  + Simple
|   + Name: ENCODER
|   + String: Lavf56.36.100
| + Tag
|  + Targets
|   + TrackUID: 1
|  + Simple
|   + Name: LANGUAGE
|   + String: eng
| + Tag
|  + Targets
|   + TrackUID: 2
|  + Simple
|   + Name: LANGUAGE
|   + String: eng
|  + Simple
|   + Name: ENCODER
|   + String: Lavc56.41.100 aac
|+ Cluster