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I used standard webm settings in VLC player 2.2.1 (the latest) to convert a 4-minute mp4 made in Handbrake. In the conversion panel it says "Streaming 04:00" but the end result is "03:49:15" and, on two further attempts, "03:56:28" and "04:04:23". The file size is almost the same as the mp4 (4MB).

The length of the webm video - i.e. more than 4 hours - is confirmed by MediaInfo and by Firefox native player, videojs player, and VLC player. In VLC player, I tried clicking on the progress bar to explore exactly what takes up 4 hours, but on-click it closes the video. In Firefox, the same test returns the video to frame 1.

Update (30 August)

I did a test on this "generic mp4": http://download.wavetlan.com/SVV/Media/HTTP/H264/Talkinghead_Media/H264_test1_Talkinghead_mp4_480x360.mp4. Do not know if it was done with Handbrake. Then converted it to webm, using default settings, with VLC 2.2.1.

Results: The mp4 is 00:00:14s, the webm is 22:40:00s. But the webm is not really 22 hours long, it plays for 14s just like the mp4. However, in a html5 player, Firefox and Chrome native players and VLC player, the progress bar gives the length as 22:40:00.

  • Can you post the source mp4? – Gyan Aug 29 '15 at 13:40
  • @Mulvya - see update in the question above. It does not seem to be a problem of the mp4 source - the new file I tested on I found at random and it has the same problem in webm as my own mp4 files. To test, see link in my question. – plugincontainer Aug 30 '15 at 5:20
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+50

Yes, it seems to be a problem of generated timecode. See https://trac.videolan.org/vlc/ticket/12713#no1

Switch to ffmpeg (with a GUI like Avanti) to avoid this issue. My answer to an earlier webm question may guide you on settings.

  • if the ticket is 10 months old and they didn't fix it, probably means I shouldn't be holding my breath over it? – user3453281 Sep 1 '15 at 23:24
  • Yeah. Use ffmpeg instead. – Gyan Sep 2 '15 at 8:31

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