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It's not just ability to use flac - there's a bunch of other restrictions on the MKV format for webm. These include chapters & menus (and ability to use separat

by sparkie 14y ago

It's not just ability to use flac - there's a bunch of other restrictions on the MKV format for webm. These include chapters & menus (and ability to use separate media streams for each), support for variety of subtitle/closed caption formats, plus the ability to add attachments like fonts, textures and images for use in those streams. Some of these features have been re-invented in the webvtt format, which is inferior to what was already available.

ZeroGravitas 14y ago
If they have good reason to break compatability with WebM, then they might want to use Opus (Xiph's follow-up to Vorbis) as the audio codec. It's possible that its combination of voice and wideband audio could be ideal for video soundtracks. http://opus-codec.org/ http://opus-codec.org/
- makomk 14y ago
  Opus is optimised for low-delay, relatively-low-bandwidth audio for stuff like VOIP. It doesn't make much sense for recorded media where you can quite easily hide a few hundred milliseconds of latency.
  - ZeroGravitas 14y ago
    Opus is actually designed to span from low to high bandwidth (see the diagram here http://www.opus-codec.org/comparison/ http://www.opus-codec.org/comparison/) and since it performed surprisingly well against aac and vorbis the developers are currently working on tuning the encoder for standard music/soundtrack type workloads at higher bitrates. I was thinking that the mixed speech mode of Opus might be excellent for documentaries and such with lots of dialogue at Youtube or web bitrates but you're right, I forgot in this case we're talking Blu-ray size video, in which case you can just play it safe and ramp up the vorbis bitrate instead and it'll be a drop in the ocean compared with the video bitrate.
  - deleted 14y ago
    [deleted]
jkn 14y ago
Ah I thought these features would be implemented outside of the WebM files, like on DVDs where menus and subtitles are separate from the mpeg2 files that contain the movie.

by sparkie 14y ago

ZeroGravitas 14y ago

If they have good reason to break compatability with WebM, then they might want to use Opus (Xiph's follow-up to Vorbis) as the audio codec. It's possible that its combination of voice and wideband audio could be ideal for video soundtracks. http://opus-codec.org/ http://opus-codec.org/

makomk 14y ago
Opus is optimised for low-delay, relatively-low-bandwidth audio for stuff like VOIP. It doesn't make much sense for recorded media where you can quite easily hide a few hundred milliseconds of latency.
- ZeroGravitas 14y ago
  Opus is actually designed to span from low to high bandwidth (see the diagram here http://www.opus-codec.org/comparison/ http://www.opus-codec.org/comparison/) and since it performed surprisingly well against aac and vorbis the developers are currently working on tuning the encoder for standard music/soundtrack type workloads at higher bitrates. I was thinking that the mixed speech mode of Opus might be excellent for documentaries and such with lots of dialogue at Youtube or web bitrates but you're right, I forgot in this case we're talking Blu-ray size video, in which case you can just play it safe and ramp up the vorbis bitrate instead and it'll be a drop in the ocean compared with the video bitrate.
- deleted 14y ago
  [deleted]

jkn 14y ago

Ah I thought these features would be implemented outside of the WebM files, like on DVDs where menus and subtitles are separate from the mpeg2 files that contain the movie.