[FFmpeg-devel] [PATCH v14] avformat/dashdec: add dash demuxer base version

[Steven Liu]

2017-04-11 22:27 GMT+08:00 Andy Furniss <adf.lists at gmail.com>:

> Steven Liu wrote:
>
>> ffmpeg need a dash demuxer for demux the dash formats base on
>> https://github.com/samsamsam-iptvplayer/exteplayer3/blob/mas
>> ter/tmp/ffmpeg/patches/3.2.2/000001_add_dash_demux.patch
>>
>>  TODO: 1. support multi bitrate dash
>>
>
> v14 fixed: 1. fix bug: TLS connection was non-properly terminated 2.
>> fix bug: No trailing CRLF found in HTTP header
>>
>
> Thanks.
>
> They are pretty much gone now, though I did see one TLS out of about 3
> hours running (3.84s chunks)
>
> Another user who is testing the same live stream saw eight
> TLS @ 0xae75700" referring to TLS packets of unexpected length.
> over a 3 hour run.
>
> One issue that I guess is not really a bug, but on a live stream you
> really need to have your clock either spot on or slow.
>
> Ok, so maybe I should run ntpd "properly" - though not running it does
> offer a workaround of setting clock back a bit (the stream mpd below has
> a 10 minute buffer).
>
> This issue = even if set my clock with ntpd -q only a small amount of
> too fast drift will lead to (after a couple of hours)
>
> [https @ 0x365e580] HTTP error 404 Not Found
> [dash @ 0x3657360] Failed to open fragment of playlist 0
>
> ntpd -q showed I was 0.2 sec fast at that point - for the purpose of
> testing just setting one sec fast will quickly start getting 404s which
> are not retried, so break the stream.
>
> I notice there is a time url in the mpd - but even if that were used
> initially vs clock, I still think drift would break things.
>
>
> Here's the .mpd (same as link I gave before - pasting as I suspect it's
> geo restricted).
>

The result is: you want to say: use the UTCTimeing's value, if it show in
mpd file, do i misunderstand you?

>
> <?xml version="1.0" encoding="UTF-8"?>
> <MPD type="dynamic" xmlns="urn:mpeg:dash:schema:mpd:2011"
> xmlns:dvb="urn:dvb:dash-extensions:2014-1" profiles="urn:dvb:dash:profile
> :dvb-dash:2014,urn:dvb:dash:profile:dvb-dash:isoff-ext-live:2014"
> minBufferTime="PT2.034S" maxSegmentDuration="PT3.84S"
> timeShiftBufferDepth="PT10M" minimumUpdatePeriod="PT1H"
> availabilityStartTime="1970-01-01T00:01:00Z"
> publishTime="2017-02-01T15:13:36Z">
>         <!-- MPEG DASH ISO BMFF test stream -->
>         <!-- Lossless audio using FLAC -->
>         <!-- BBC Research & Development -->
>         <!-- For more information see http://rdmedia.bbc.co.uk -->
>         <!-- Email dash at rd.bbc.co.uk -->
>         <!-- (c) British Broadcasting Corporation 2017.  All rights
> reserved.-->
>         <ProgramInformation>
>                 <Title>Radio 3 lossless</Title>
>                 <Source>BBC Research and Development</Source>
>                 <Copyright>British Broadcasting Corporation
> 2017</Copyright>
>         </ProgramInformation>
>     <UTCTiming schemeIdUri="urn:mpeg:dash:utc:http-xsdate:2014" value="
> http://time.akamai.com/?iso"/>
>         <Period start="PT0S">
>                 <AdaptationSet startWithSAP="2" segmentAlignment="true"
> id="1" codecs="flac" audioSamplingRate="48000" lang="eng"
> mimeType="audio/mp4">
>                         <AudioChannelConfiguration
> schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011"
> value="2"/>
>                         <Role schemeIdUri="urn:mpeg:dash:role:2011"
> value="main"/>
>                         <SegmentTemplate timescale="48000"
> duration="184320" media="$RepresentationID$/$Number%06d$.m4s"
> initialization="$RepresentationID$/IS.mp4" startNumber="1"
> presentationTimeOffset="0"/>
>                         <Representation id="A1" bandwidth="365000"/>
>                 </AdaptationSet>
>         </Period>
>         <Metrics metrics="DVBErrors">
>                 <Reporting schemeIdUri="urn:dvb:dash:reporting:2014"
> value="1" dvb:reportingUrl="http://rdmedia.bbc.co.uk/dash/errorreporti
> ng/reporterror.php" dvb:probability="50"/>
>         </Metrics>
> </MPD>
>
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