[vlc-devel] [PATCH 3/3] demux/mp4: Add fragmented MP4 support

[Frederic YHUEL]

2012/4/24 Frédéric Yhuel <fyhuel at viotech.net>:
> TODO:
> - add support for (DASH) multiplexed content (only video track is played
>  for now).
> - add support for resolution switches for DASH (needs modification in
>  DASH client)
>

PS: I already did the second task (see attached patch). It works well,
as long as DASH put a new initialization segment in its pipeline
whenever segment N+1 has a resolution different than segment N 's one.

Chris (or I) will patch DASH module, but in the meantime you can test
with a fake MPD like below, where URLs to appropriate init segments
are put in the middle of a "Representation".

<?xml version="1.0" encoding="UTF-8"?>
<MPD xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="urn:mpeg:DASH:schema:MPD:2011"
     xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011"
     profiles="urn:mpeg:dash:profile:isoff-main:2011"
     type="static"
     mediaPresentationDuration="PT0H10M53.79S"
     minBufferTime="PT15.0S">
     <BaseURL>http://www-itec.uni-klu.ac.at/ftp/datasets/mmsys12/ElephantsDream/ed_15s/</BaseURL>
     <Period start="PT0S">
          <AdaptationSet bitstreamSwitching="true">
<Representation id="0" codecs="avc1" mimeType="video/mp4" width="320"
height="240" startWithSAP="1" bandwidth="89324">
<SegmentBase>
    <Initialization sourceURL="ed_15sec_100kbit/ed_1080p24_100kbit_dash.mp4"/>
</SegmentBase>
<SegmentList duration="15">
    <SegmentURL media="ed_15sec_100kbit/ed_15sec1.m4s"/>
    <SegmentURL media="ed_15sec_100kbit/ed_15sec2.m4s"/>
    <SegmentURL media="ed_15sec_400kbit/ed_1080p24_400kbit_dash.mp4"/>
    <SegmentURL media="ed_15sec_400kbit/ed_15sec3.m4s"/>
    <SegmentURL media="ed_15sec_400kbit/ed_15sec4.m4s"/>
    <SegmentURL media="ed_15sec_600kbit/ed_1080p24_600kbit_dash.mp4"/>
    <SegmentURL media="ed_15sec_600kbit/ed_15sec5.m4s"/>
    <SegmentURL media="ed_15sec_600kbit/ed_15sec6.m4s"/>
    <SegmentURL media="ed_15sec_900kbit/ed_1080p24_900kbit_dash.mp4"/>
    <SegmentURL media="ed_15sec_900kbit/ed_15sec7.m4s"/>
    <SegmentURL media="ed_15sec_900kbit/ed_15sec8.m4s"/>
   </SegmentList>
</Representation>
          </AdaptationSet>
    </Period>
</MPD>


-- 
Frédéric
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