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

[Mossroy]

I tested to convert my video with ffmpeg instead of libav.
For that, I installed ffmpeg (version 1.2.6-1~trusty1) from this PPA : ppa:jon-severinsson/ffmpeg , on Trusty

The result is attached, and works correctly with Firefox.

So this gives at least a workaround on Trusty

$ mkvinfo P5270914-trusty-ffmpeg.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 271445
|+ Seek head (subentries will be skipped)
|+ EbmlVoid (size: 163)
|+ Segment information
| + Timecode scale: 1000000
| + Muxing application: Lavf54.63.104
| + Writing application: Lavf54.63.104
| + Segment UID: 0x86 0xd8 0xad 0xa2 0x7d 0x9b 0xb3 0x23 0x7d 0x91 0x40 0x58 0xe7 0x22 0xb6 0x78
| + Duration: 4.775s (00:00:04.775)
|+ 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: 33.367ms (29.970 frames/fields per second for a video track)
|  + Video track
|   + Pixel width: 1920
|   + Pixel height: 1080
|   + Display width: 1920
|   + Display height: 1080
| + 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 3951
|+ Cluster

** Attachment added: "WebM file generated with FFMPEG on Trusty"
   https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1323822/+attachment/4121477/+files/P5270914-trusty-ffmpeg.webm

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

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