[Bug 1323822] Re: Firefox can not play some WebM videos generated by avconv on Trusty

[Mossroy]

Mkvinfo for the WebM file generated on Trusty :
$ mkvinfo P5270914-trusty.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 217051
|+ Seek head (subentries will be skipped)
|+ EbmlVoid (size: 163)
|+ Segment information
| + Timecode scale: 1000000
| + Muxing application: Lavf54.20.4
| + Writing application: Lavf54.20.4
| + Segment UID: 0x3e 0x93 0xba 0x8b 0xfd 0xdf 0xd6 0xff 0xd9 0x02 0xc0 0xaa 0xbd 0x1a 0x95 0xd2
| + Duration: 4.772s (00:00:04.772)
|+ Segment tracks
| + A track
|  + Track number: 1 (track ID for mkvmerge & mkvextract: 0)
|  + Track UID: 1
|  + Lacing flag: 0
|  + Language: eng
|  + Codec ID: V_VP8
|  + Track type: video
|  + Default duration: 0.033ms (30000.300 frames/fields per second for a video track)
|  + Video track
|   + Pixel width: 1920
|   + Pixel height: 1080
|   + Display width: 1920
|   + Display height: 1080
|   + Display unit: 3 (aspect ratio)
| + A track
|  + Track number: 2 (track ID for mkvmerge & mkvextract: 1)
|  + Track UID: 2
|  + Lacing flag: 0
|  + Language: eng
|  + Codec ID: A_VORBIS
|  + Track type: audio
|  + Audio track
|   + Channels: 2
|   + Sampling frequency: 48000
|   + Bit depth: 32
|  + CodecPrivate, length 3949
|+ Cluster


** Attachment added: "WebM file generated on Trusty"
   https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1323822/+attachment/4120903/+files/P5270914-trusty.webm

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https://bugs.launchpad.net/bugs/1323822

Title:
  Firefox can not play some WebM videos generated by avconv on Trusty

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