[Icecast] Webm files written without duration in header

[Sytze Visser]

Hi Marvin

I followed this advice for updating moov flags in mp4 and it "streams"
directly from the file location on the server with html5 video:
https://rigor.com/blog/optimizing-mp4-video-for-fast-streaming.

Progressive downloading, seeking and video time all works 100% on a 195MB
file.

Regards

On Wed, May 1, 2019 at 10:19 PM Marvin Scholz <epirat07 at gmail.com> wrote:

>
>
> On 1 May 2019, at 22:06, Sytze Visser wrote:
>
> > Hi Fred.
> >
> > Appreciate your response.
> >
> > Maybe in my explanation I have some red and green apples, but I can
> > agree that my understanding is as you explained it. 😊
> >
> > The point is that if I can successfully stream mp4 with H.264 and AAC
> > encoding without any issues to icecast, I can then use ffmpeg to
>
> Hi,
> just a quick thing to clarify before you waste too much time on this:
>
> MP4 is not streamable due to the way the format works. The header/trailer
> that a valid mp4 files needs to have, requires "knowledge" of the whole
> file which makes it impossible to stream it.
>
> What HLS or DASH does is not "streaming" in the "traditional" sense of
> streaming but rather it is downloading small complete file chunks that
> nowadays mostly use fragmented MP4.
>
> You can't stream MP4 with Icecast.
> If you for some reason have to stream H.264 you could use MPEG TS.
> Note that this might have licensing implications as MPEG TS is not
> royalty-free.
>
> > turn it into HLS which then solves my iOS support issue. The CPU
> > cost of repackaging MP4 into HLS architecture should be minimal
> > because at the core it’s all H.264. No transcoding! Low CPU objective
> > achieved!
> > Additional bonus is that I already use Apach2 with icecast and
> > integrating the whole lot into my existing infrastructure is easy.
> >
> > My question remains
> > If webm/ogv is supported but mp4 not, what are the technical differences
> > in how icecast handles the one and not the other? What does icecast
> > manage/do for supported formats as opposed to unsupported ones?
> >
> > Kind regards
> >
> > On Wed, 2019-05-01 at 19:56 +0200, Sytze Visser wrote:
> >> I read somewhere that MP4 is not supported on icecast, which is a
> >> pity. I have invested a lot in an icecast based audio solution and
> >> want expand it with video.
> >
> > It all depends on what one means by 'MP4' (which is more a marketing
> > term than a technical one). AAC+ (aka 'high efficiency' AAC) works very
> > well on IceCast, albeit that only covers the audio side on the
> > equation.
> >
> >> So my question is now:
> >> MP4 (H.264) is a close relative of HLS (can also be H.264) which
> >> brings me very close to a solution.
> >
> > You're mixing apples and oranges here (pun accidental). H.264 is a
> > content encoding, like MPEG Layer III (so-called 'MP3') or OggVorbis.
> > HLS OTOH is a streaming architecture, and as such is largely orthogonal
> > to the content encoding used. It works by segmenting the media stream
> > into discrete files and then distributing them via HTTP(S). The big
> > advantage of this approach is that standard 'garden variety' web
> > servers (think Apache) can be used to serve the streams, which makes it
> > play particularly well with CDNs, at the cost of significantly greater
> > complexity in the encoder and player components. No specialized
> > 'streaming server' (such as Icecast) is required in the HLS ecosystem
> > at all.
> >
> > Cheers!
> >
> >
> > |---------------------------------------------------------------------|
> > | Frederick F. Gleason, Jr. |             Chief Developer             |
> > |                           |             Paravel Systems             |
> > |---------------------------------------------------------------------|
> > |  An expert is a person who avoids the small errors while he sweeps  |
> > |  on to the grand fallacy.                                           |
> > |                                                                     |
> > |                                              -- Benjamin Stolberg   |
> > |---------------------------------------------------------------------|
> >
> > _______________________________________________
> > Icecast mailing list
> > Icecast at xiph.org
> > http://lists.xiph.org/mailman/listinfo/icecast
> >
> > _______________________________________________
> > Icecast mailing list
> > Icecast at xiph.org
> > http://lists.xiph.org/mailman/listinfo/icecast
> _______________________________________________
> Icecast mailing list
> Icecast at xiph.org
> http://lists.xiph.org/mailman/listinfo/icecast
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.xiph.org/pipermail/icecast/attachments/20190502/e406576a/attachment.htm>