[FFmpeg-devel] [PATCH] WebM mux/demux

David Conrad lessen42
Wed May 19 23:22:00 CEST 2010

On May 19, 2010, at 5:10 PM, David Conrad wrote:

> On May 19, 2010, at 3:07 PM, Ronald S. Bultje wrote:
>> Hi,
>> On Wed, May 19, 2010 at 3:05 PM, David Conrad <lessen42 at gmail.com> wrote:
>>> On May 19, 2010, at 3:02 PM, Ronald S. Bultje wrote:
>>>> On Wed, May 19, 2010 at 2:51 PM, James Zern <jzern at google.com> wrote:
>>>>> Related thread: '[PATCH] VP8 de/encode via libvpx'
>>>>> VP8 and associated WebM container made public today [1].
>>>>> The attached adds WebM de/muxing to matroska.
>>>>> For both some extra ifdef's/checks were added to only allow VP8/vorbis
>>>>> as that is the current supported configuration in web browsers. If
>>>>> these are too busy in this respect they be cleaned up.
>>>> Why is the "webm demuxer" separate? Our quicktime demuxer, for
>>>> example, demuxes mp4 and 3gp also. The same could be done for
>>>> matroska. After all, it's a regular subset and thus any matroska
>>>> demuxer understanding the "webm" ID could demux webm files also. (I
>>>> know this isn't true for the muxer.)
>>> Agreed, it should be something like the attached
>> Almost, right now it uses sizeof(doctype), you make that strlen, which
>> is a little slower (don't forget you loop it many times). You could
>> probably calculate that once outside the loop and then use that
>> (static, unchangeable) value in the loop every iteration.
>> Other than that, yes that's what I had in mind.
> Fixed

(for certain definitions of fixed...)

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