mau@garlach:~/Video/video_editing$ LANG=C mkvinfo trans.slideshow.webm
+ EBML head
|+ EBML version: 1
|+ EBML read version: 1
|+ EBML maximum ID length: 4
|+ EBML maximum size length: 8
|+ Doc type: webm
|+ Doc type version: 2
|+ Doc type read version: 2
+ Segment, size 75215
|+ Seek head (subentries will be skipped)
|+ EbmlVoid (size: 163)
|+ Segment information
| + Timecode scale: 1000000
| + Muxing application: Lavf53.21.0
| + Writing application: Lavf53.21.0
| + Segment UID:0xa1 0xfd 0xf6 0x05 0x41 0xb4 0x94 0xd4 0xfe 0x04 0x4e 0x7c 0xe7 0xe5 0xcc 0xfa
| + Duration: 121.000s (00:02:01.000)
|+ Segment tracks
| + A track
|  + Track number: 1
|  + Track UID: 1
|  + Lacing flag: 0
|  + Language: und
|  + Codec ID: V_VP8
|  + Track type: video
|  + Default duration: 1000.000ms (1.000 fps for a video track)
|  + Video track
|   + Pixel width: 320
|   + Pixel height: 240
|+ Cluster
mau@garlach:~/Video/video_editing$