[gst-devel] MP4: Endless stream impossible?

[Wim Taymans]

On Fri, 2010-08-27 at 11:03 +0200, Andres Gonzalez wrote:
> On 27/08/10 10:21, beast wrote:
> > Hi,
> >
> > I have the general question about MP4 and streaming. Given are two raw data
> > streams (h264 and aac) for input, which should be muxed into a streamable
> > format. The input streams are potentially endless; those are real streams
> > and not files. The scenario is similar to streaming from a web cam. The
> > (muxed) output stream should be available as soon as some raw input data is
> > available.

Did you check this?

https://bugzilla.gnome.org/show_bug.cgi?id=596321

Wim

> >
> > To my current understanding, this cannot be done using MP4. For the given
> > receiver, it is necessary to have the moov box before the mdat box. However
> > the moov box must contain index information for the entire stream. This
> > information is not available when streaming is started. Is this correct?
> > Some confirmation would be highly appreciated, I am no expert in this field.
> > Are there any workarounds?
> Hi,
> I am working in a similar problem. As far as I know, all players and 
> processors require the moov atom being present to work with a MP4 file.
> I don't have a deep understanding of MP4 format, but I think this index 
> information is generated as the video is being produced, but written all 
> together at the end. As I said, players require the information being 
> present explicitly to play a MP4. What I am not sure is if this index 
> information could be deduced from raw data by some "intelligent" processing.
> 
> This is not an easy task. I have been working on it for a while, but 
> achieved no results, yet. If you want to do something like this, maybe 
> you want to look at this project, from a person who tried to rebuild 
> index information in a tuncated video:
> 
> http://vcg.isti.cnr.it/~ponchio/life/code/untrunk_readme.html
> 
> Regards,
> Andrés
> 
> > For the given receiver, 3GP would be an alternative container format. But
> > since it's also an ISO format similar to MP4 it has probable the same issue,
> > right? I haven't looked at the details yet, so if someone would tell be the
> > opposite, I would be very pleased.
> >
> > Thanks,
> > beast
> 
> 
> 
> 
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