[FFmpeg-devel] [PATCH 0/3] WebM in dashenc

Jan Ekström jeebjp at gmail.com
Thu May 3 19:41:13 EEST 2018

On Fri, Apr 27, 2018 at 3:51 AM, Jan Ekström <jeebjp at gmail.com> wrote:
> Personally I would be for removal of the WebM muxing feature in dashenc
> altogether, since the dashenc feature has never seemingly worked, and
> since there is a whole separate WebM-specific DASH meta muxer in
> webmdashenc.
> But these patches should at least make the thing not crash, and put it
> under FF_COMPLIANCE_EXPERIMENTAL strictness. That way nobody should be
> accidentally utilizing it.

For the record, I wrote this at around 4AM under the impression that
the "WebM DASH" muxer was actually what you would expect from its
name.. (and by quickly checking that it seemed to be writing a DASH

It most certainly is not that, it just writes a DASH manifest. Does
not actually mux anything. So yes, dashenc is the thing to poke for
both ISOBMFF and WebM DASH.

Accordingly, I have found out that someone actually utilized WebM dash
for audio, and they mentioned that it worked for them on Chromium,
Firefox and Edge. The muxer seems to have worked without crashing at
least during release/3.4. I asked them to verify some video as well,
and if it works then the FF_COMPLIANCE_EXPERIMENTAL limitation can be

Kind of glad adding that made someone notice something, and report
that they were actually utilizing the feature. They seemed to be happy
about the thing no longer crashing, as well as the pass-through of
compliance mode to the sub-muxer.

Best regards,

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