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

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On 2014-05-31T12:33:04+00:00 Mossroy wrote:

Created attachment 8432087
P5270914-trusty.webm

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0 (Beta/Release)
Build ID: 20140428193813

Steps to reproduce:

Open the attached WebM video file with Firefox


Actual results:

The video does not play at all : the cursor seems to jump at the end.
Seeking anywhere inside the video does not help.
This same file can be played without issues on Chromium, VLC and Totem (on Ubuntu)

See original bug report on Ubuntu :
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1323822


Expected results:

Either the file is "corrupted" in the sense that it does not comply to the expected format. In this case, I would expect to have an error message somewhere.
Either it is correct, and it should be played by Firefox.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1323822/comments/12

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On 2014-05-31T12:39:58+00:00 Mossroy wrote:

Here is the mkvinfo of the attached file :

$ 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

Please notice that the "default duration" value seems strange to me

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1323822/comments/13

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On 2014-05-31T13:00:13+00:00 Mossroy wrote:

Please note that this video has been generated with libav 9.13-0ubuntu0.14.04.1 on Ubuntu Trusty, by converting from a H.264 source video. It can be reproduced very easily with other source videos.
When converting with some other versions of libav (at least the one of Ubuntu Precise), or the latest version of ffmpeg, the generated video file can be played by Firefox.
See the details on Launchpad issue.

So it looks like a "misunderstanding" between this libav version and Firefox.
Maybe there is an issue in libav itself.
I created this issue on Buzilla because the video works on several other implementations, and because the issue is the same with Firefox on W7 (not ubuntu-specific)

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1323822/comments/14


** Changed in: firefox
       Status: Unknown => New

** Changed in: firefox
   Importance: Unknown => Medium

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

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