Comprehensive documentation for WebM file specification

[Nick Adams]

Hello, I am creating a video and audio editor in Java on Android and would like to support WebM files. Where can I find comprehensive documentation for the WebM file specification? Preferably something like this specification for Wav files where I can see the field size, offset, name, endianness, and a description of each field. 

Thank you hope everyone is well!

[James Zern]

Hi Nick,

On Fri, Oct 1, 2021 at 7:39 AM Nick Adams <nickc.a...@gmail.com> wrote:

Hello, I am creating a video and audio editor in Java on Android and would like to support WebM files. Where can I find comprehensive documentation for the WebM file specification? Preferably something like this specification for Wav files where I can see the field size, offset, name, endianness, and a description of each field. 

The WebM container [1] is based on Matroska [2]. You should be able to find what you are looking for on those pages.

As far as Android is concerned the platform supports the format via MediaParser [3]. libwebm, libmatroska and ffmpeg's muxer/demuxer are good examples of native parsing.

 If you have any other questions please let us know.

[1] https://www.webmproject.org/docs/container/

[2] https://matroska.org/

[3] https://developer.android.com/reference/android/media/MediaParser

 

Thank you hope everyone is well!

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[Matthew Heaney]

https://matroska.org/index.html

https://docs.fileformat.com/video/webm/

On Fri, Oct 1, 2021 at 7:39 AM Nick Adams <nickc.a...@gmail.com> wrote:

--

[Steve Lhomme]

On 2021-10-01 23:05, 'James Zern' via WebM Discussion wrote:
> Hi Nick,
>
> On Fri, Oct 1, 2021 at 7:39 AM Nick Adams <nickc.a...@gmail.com
> <mailto:nickc.a...@gmail.com>> wrote:
>
> Hello, I am creating a video and audio editor in Java on Android and
> would like to support WebM files. Where can I find comprehensive
> documentation for the WebM file specification? Preferably something
> like this specification for Wav files where I can see the field
> size, offset, name, endianness, and a description of each field.
>
>
> The WebM container [1] is based on Matroska [2]. You should be able to
> find what you are looking for on those pages.

Also supporting WebM won't be as straightforward as supporting AVI with
fixed sizes. WebM/Matroska is based on EBML RFC8794 [4] which is more
like XML than RIFF. You can't deduce positions of elements that easily.

A proper specification of Matroska (on which WebM is based) is being
written at the IETF [5]. It will end up being the official specification
for the format.

> As far as Android is concerned the platform supports the format via
> MediaParser [3]. libwebm, libmatroska and ffmpeg's muxer/demuxer are
> good examples of native parsing.
>
>  If you have any other questions please let us know.
>
> [1] https://www.webmproject.org/docs/container/
> <https://www.webmproject.org/docs/container/>

> [2] https://matroska.org/ <https://matroska.org/>
> [3] https://developer.android.com/reference/android/media/MediaParser
> <https://developer.android.com/reference/android/media/MediaParser>

[4] https://www.rfc-editor.org/info/rfc8794
[5] https://datatracker.ietf.org/doc/draft-ietf-cellar-matroska/

>
> Thank you hope everyone is well!
>

> wavformat.png
>
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>
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