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Collections - Formulaire de création rapide

19 février 2013, par kent1

Mis à jour : Février 2013

Langue : français

Type : Image

Tags : plugin, collection, MediaSPIP 0.2

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Les Miserables

4 juin 2012, par kent1

Mis à jour : Février 2013

Langue : English

Type : Texte

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Ne pas afficher certaines informations : page d’accueil

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The Great Big Beautiful Tomorrow

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Richard Stallman et la révolution du logiciel libre - Une biographie autorisée (version epub)

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Rennes Emotion Map 2010-11

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FFMPEG, Creating an MPEG-DASH stream with existing inputs

10 septembre 2019, par kitensei

I am trying to generating a DASH .mpd file from multiple inputs (2 videos, 1 audio) without any success..

What I’d like to do it’s simple getting the streams and create an mpd file without any re encoding since I’ve already my sources ready.

The output seems to work in rxplayer, but I do get a lot of errors (see log below).

Here are my 3 sources (taken from http://dash-mse-test.appspot.com/media.html) :

➜  test-dash $ ffprobe -hide_banner ../test-sources/car/car-20120827-89.mp4

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../test-sources/car/car-20120827-89.mp4':

  Metadata:

    major_brand     : dash

    minor_version   : 0

    compatible_brands: iso6avc1mp41

    creation_time   : 2012-08-24T03:04:15.000000Z

  Duration: 00:03:01.39, start: 0.000000, bitrate: 4202 kb/s

    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080, 171 kb/s, 23.97 fps, 23.97 tbr, 90k tbn, 47.95 tbc (default)

    Metadata:

      creation_time   : 2012-08-24T03:04:15.000000Z

      handler_name    : VideoHandler



➜  test-dash $ ffprobe -hide_banner ../test-sources/car/car-20120827-88.mp4

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../test-sources/car/car-20120827-88.mp4':

  Metadata:

    major_brand     : dash

    minor_version   : 0

    compatible_brands: iso6avc1mp41

    creation_time   : 2012-08-27T01:01:28.000000Z

  Duration: 00:03:01.43, start: 0.000000, bitrate: 2076 kb/s

    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 1280x720, 81 kb/s, 23.97 fps, 23.97 tbr, 90k tbn, 47.95 tbc (default)

    Metadata:

      creation_time   : 2012-08-27T01:01:28.000000Z

      handler_name    : VideoHandler



➜  test-dash $ ffprobe -hide_banner ../test-sources/car/car-20120827-8b.mp4 

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../test-sources/car/car-20120827-8b.mp4':

  Metadata:

    major_brand     : dash

    minor_version   : 0

    compatible_brands: iso6mp41

    creation_time   : 2012-08-27T01:19:23.000000Z

  Duration: 00:03:01.63, start: 0.000000, bitrate: 31 kb/s

    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 1 kb/s (default)

    Metadata:

      creation_time   : 2012-08-27T01:19:23.000000Z

      handler_name    : SoundHandler

And here how I am "muxing" them together with an .mpd manifest :

ffmpeg  \

-re \

-i ../test-sources/car/car-20120827-88.mp4 \

-i ../test-sources/car/car-20120827-89.mp4 \

-i ../test-sources/car/car-20120827-8d.mp4 \

-map 0:0  \

-map 1:0 \

-map 2:0 \

-c copy \

-bf 1 -keyint_min 120 -g 120 -sc_threshold 0 \

-b_strategy 0 -use_timeline 1 -use_template 1 \

-adaptation_sets "id=0,streams=v id=1,streams=a" \

-f dash out.mpd

The generated mpd file :

&lt;?xml version="1.0" encoding="utf-8"?>

<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediapresentationduration="PT3M1.3S" minbuffertime="PT10.0S">

    <programinformation>

    </programinformation>

    <period start="PT0.0S">

        <adaptationset contenttype="video" segmentalignment="true" bitstreamswitching="true" lang="und">

            <representation mimetype="video/mp4" codecs="avc1.4d401f" bandwidth="81397" width="1280" height="720" framerate="45000/1877">

                <segmenttemplate timescale="24000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">

                    <segmenttimeline>

                        <s t="0" d="120128"></s>

                        <s d="120120" r="34"></s>

                        <s d="29023"></s>

                    </segmenttimeline>

                </segmenttemplate>

            </representation>

            <representation mimetype="video/mp4" codecs="avc1.640028" bandwidth="171953" width="1920" height="1080" framerate="45000/1877">

                <segmenttemplate timescale="24000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">

                    <segmenttimeline>

                        <s t="0" d="121129"></s>

                        <s d="239239"></s>

                        <s d="120120" r="32"></s>

                        <s d="29023"></s>

                    </segmenttimeline>

                </segmenttemplate>

            </representation>

        </adaptationset>

        <adaptationset contenttype="audio" segmentalignment="true" bitstreamswitching="true" lang="und">

            <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="13976" audiosamplingrate="44100">

                <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>

                <segmenttemplate timescale="44100" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="1">

                    <segmenttimeline>

                        <s t="0" d="219136"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184" r="1"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184" r="1"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184" r="1"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="221184"></s>

                        <s d="220160"></s>

                        <s d="63488"></s>

                    </segmenttimeline>

                </segmenttemplate>

            </representation>

        </adaptationset>

    </period>

</mpd>

But I get a lot of errors :

➜  test-dash git:(0.1) ✗ ffmpeg  \

-re \

-i ../test-sources/car/car-20120827-88.mp4 \

-i ../test-sources/car/car-20120827-89.mp4 \

-i ../test-sources/car/car-20120827-8d.mp4 \

-map 0:0  \

-map 1:0 \

-map 2:0 \

-c copy \

-bf 1 -keyint_min 120 -g 120 -sc_threshold 0 \

-b_strategy 0 -use_timeline 1 -use_template 1 \

-adaptation_sets "id=0,streams=v id=1,streams=a" \

-f dash out.mpd

ffmpeg version n4.2.1 Copyright (c) 2000-2019 the FFmpeg developers

  built with gcc 9.1.0 (GCC)

  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3

  libavutil      56. 31.100 / 56. 31.100

  libavcodec     58. 54.100 / 58. 54.100

  libavformat    58. 29.100 / 58. 29.100

  libavdevice    58.  8.100 / 58.  8.100

  libavfilter     7. 57.100 /  7. 57.100

  libswscale      5.  5.100 /  5.  5.100

  libswresample   3.  5.100 /  3.  5.100

  libpostproc    55.  5.100 / 55.  5.100

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../test-sources/car/car-20120827-88.mp4':

  Metadata:

    major_brand     : dash

    minor_version   : 0

    compatible_brands: iso6avc1mp41

    creation_time   : 2012-08-27T01:01:28.000000Z

  Duration: 00:03:01.43, start: 0.000000, bitrate: 2076 kb/s

    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 1280x720, 81 kb/s, 23.97 fps, 23.97 tbr, 90k tbn, 47.95 tbc (default)

    Metadata:

      creation_time   : 2012-08-27T01:01:28.000000Z

      handler_name    : VideoHandler

Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '../test-sources/car/car-20120827-89.mp4':

  Metadata:

    major_brand     : dash

    minor_version   : 0

    compatible_brands: iso6avc1mp41

    creation_time   : 2012-08-24T03:04:15.000000Z

  Duration: 00:03:01.39, start: 0.000000, bitrate: 4202 kb/s

    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080, 171 kb/s, 23.97 fps, 23.97 tbr, 90k tbn, 47.95 tbc (default)

    Metadata:

      creation_time   : 2012-08-24T03:04:15.000000Z

      handler_name    : VideoHandler

Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '../test-sources/car/car-20120827-8d.mp4':

  Metadata:

    major_brand     : dash

    minor_version   : 0

    compatible_brands: iso6mp41

    creation_time   : 2012-08-27T00:59:44.000000Z

  Duration: 00:03:01.58, start: 0.000000, bitrate: 255 kb/s

    Stream #2:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 13 kb/s (default)

    Metadata:

      creation_time   : 2012-08-27T00:59:44.000000Z

      handler_name    : SoundHandler

[dash @ 0x55b464bb1240] Opening 'init-stream0.m4s' for writing

[dash @ 0x55b464bb1240] Opening 'init-stream1.m4s' for writing

[dash @ 0x55b464bb1240] Opening 'init-stream2.m4s' for writing

Output #0, dash, to 'out.mpd':

  Metadata:

    major_brand     : dash

    minor_version   : 0

    compatible_brands: iso6avc1mp41

    encoder         : Lavf58.29.100

    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 1280x720, q=2-31, 81 kb/s, 23.97 fps, 23.97 tbr, 24k tbn, 23.98 tbc (default)

    Metadata:

      creation_time   : 2012-08-27T01:01:28.000000Z

      handler_name    : VideoHandler

    Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080, q=2-31, 171 kb/s, 23.97 fps, 23.97 tbr, 24k tbn, 23.98 tbc (default)

    Metadata:

      creation_time   : 2012-08-24T03:04:15.000000Z

      handler_name    : VideoHandler

    Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 13 kb/s (default)

    Metadata:

      creation_time   : 2012-08-27T00:59:44.000000Z

      handler_name    : SoundHandler

Stream mapping:

  Stream #0:0 -> #0:0 (copy)

  Stream #1:0 -> #0:1 (copy)

  Stream #2:0 -> #0:2 (copy)

Press [q] to stop, [?] for help

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00001.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream1-00001.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00001.m4s.tmp' for writing

[mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 119119 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00002.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Non-monotonous DTS in output stream 0:1; previous: 119127, current: 119119; changing to 119128. This may result in incorrect timestamps in the output file.

[dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing

[mp4 @ 0x55b464c425c0] Application provided duration: -1000 / timestamp: 119128 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream1-00002.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00002.m4s.tmp' for writing

[mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 120120 is out of range for mov/mp4 format

[mp4 @ 0x55b464c425c0] pts has no value

[mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 239239 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00003.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00003.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing74 bitrate=N/A speed=   1x    

[mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 359359 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00004.m4s.tmp' for writing

[mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 359359 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream1-00003.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00004.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing81 bitrate=N/A speed=   1x    

[mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 479479 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00005.m4s.tmp' for writing

[mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 479479 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream1-00004.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00005.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing86 bitrate=N/A speed=   1x    

[mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 599599 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00006.m4s.tmp' for writing

[mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 599599 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream1-00005.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00006.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing95 bitrate=N/A speed=   1x    

[mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 719719 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00007.m4s.tmp' for writing

[mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 719719 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream1-00006.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00007.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing53 bitrate=N/A speed=   1x    

[mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 839839 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00008.m4s.tmp' for writing

[mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 839839 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream1-00007.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00008.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing59 bitrate=N/A speed=   1x    

[mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 959959 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00009.m4s.tmp' for writing

[mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 959959 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream1-00008.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00009.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing66 bitrate=N/A speed=   1x    

[mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 1080079 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00010.m4s.tmp' for writing

[mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 1080079 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream1-00009.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00010.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing73 bitrate=N/A speed=   1x    

[mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 1200199 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00011.m4s.tmp' for writing

[mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 1200199 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream1-00010.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00011.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing82 bitrate=N/A speed=   1x    

[mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 1320319 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream0-00012.m4s.tmp' for writing

[mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 1320319 is out of range for mov/mp4 format

[dash @ 0x55b464bb1240] Opening 'chunk-stream1-00011.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'chunk-stream2-00012.m4s.tmp' for writing

[dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing90 bitrate=N/A speed=   1x    

...

    [mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 3962959 is out of range for mov/mp4 format

    [dash @ 0x55b464bb1240] Opening 'chunk-stream1-00033.m4s.tmp' for writing

    [dash @ 0x55b464bb1240] Opening 'chunk-stream2-00034.m4s.tmp' for writing

    [dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing06 bitrate=N/A speed=   1x    

    [mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 4083079 is out of range for mov/mp4 format

    [dash @ 0x55b464bb1240] Opening 'chunk-stream0-00035.m4s.tmp' for writing

    [mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 4083079 is out of range for mov/mp4 format

    [dash @ 0x55b464bb1240] Opening 'chunk-stream1-00034.m4s.tmp' for writing

    [dash @ 0x55b464bb1240] Opening 'chunk-stream2-00035.m4s.tmp' for writing

    [dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing10 bitrate=N/A speed=   1x    

    [mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 4203199 is out of range for mov/mp4 format

    [dash @ 0x55b464bb1240] Opening 'chunk-stream0-00036.m4s.tmp' for writing

    [mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 4203199 is out of range for mov/mp4 format

    [dash @ 0x55b464bb1240] Opening 'chunk-stream1-00035.m4s.tmp' for writing

    [dash @ 0x55b464bb1240] Opening 'chunk-stream2-00036.m4s.tmp' for writing

    [dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing67 bitrate=N/A speed=   1x    

    [mp4 @ 0x55b464c3d840] Application provided duration: -8 / timestamp: 4323319 is out of range for mov/mp4 format

    [dash @ 0x55b464bb1240] Opening 'chunk-stream0-00037.m4s.tmp' for writing

    [mp4 @ 0x55b464c425c0] Application provided duration: -8 / timestamp: 4323319 is out of range for mov/mp4 format

    [dash @ 0x55b464bb1240] Opening 'chunk-stream1-00036.m4s.tmp' for writing

    [dash @ 0x55b464bb1240] Opening 'chunk-stream2-00037.m4s.tmp' for writing

    [dash @ 0x55b464bb1240] Opening 'out.mpd.tmp' for writing18 bitrate=N/A speed=   1x    

    frame= 4350 fps= 24 q=-1.0 Lq=-1.0 size=N/A time=00:03:01.55 bitrate=N/A speed=   1x    

    video:138926kB audio:5621kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

Playing 'aes-256-ctr' encrypted DASH stream with FFMPEG/FFPLAY

9 mars 2020, par michalSolarz
I try to play that stream with following command ffplay -allowed_extensions ALL -loglevel debug -decryption_key "***" -encryption_scheme aes-256-ctr https://*** but I receive following output :
```
 Error when loading first fragment, playlist 0

[AVIOContext @ 0x7f6a60647600] Statistics: 55123 bytes read, 0 seeks

****/stream.mpd: Invalid data found when processing input
```
Is it possible to do it at all ?

How to correctly calculate which segments are ready to be downloaded using MPEG-DASH

24 avril 2019, par igal k

What i’m trying to do ?

Write a simple MPEG-DASH client using the SegmentTemplate pattern to calculate which segments are ready to be downloaded for a live source.

A picture taken using chrome’s debugging tools at a moment X showing an mpd request(8af651fd747.....mpd) and the actual segments fetched respectfully to that request.

Given the following MPD

<mpd availabilitystarttime="2019-04-24T06:43:32Z" maxsegmentduration="PT4.096S" minbuffertime="PT4.096S" minimumupdateperiod="PT15.835S" profiles="urn:mpeg:dash:profile:isoff-live:2011" publishtime="2019-04-24T11:14:01Z" suggestedpresentationdelay="PT11.878S" timeshiftbufferdepth="PT65.536S" type="dynamic" xmlns="urn:mpeg:dash:schema:mpd:2011">

  <location>https://content-aaps1.uplynk.com/channel/8af651fd7473474f86a05ffb0a1c8972.mpd?rmt=wv&amp;amp;cid=8af651fd7473474f86a05ffb0a1c8972&amp;amp;oid=600e5c27541344a1bf3818617ad712ce&amp;amp;prettydash=1&amp;amp;exp=1556091088&amp;amp;rn=4138683939&amp;amp;tc=1&amp;amp;ct=c&amp;amp;sig=5fb7f0c18f3f1d2ad4fdee53c02c1e1ed904bc5e8474f4ebf886d209ff7f21c9&amp;amp;pbs=05b6594bcf4b4728ac1094976a80194d</location>

  <period start="PT2826.240S">

    <adaptationset maxframerate="30" maxheight="720" maxwidth="1280" mimetype="video/mp4" segmentalignment="true" startwithsap="1">

      <representation bandwidth="2604473" codecs="avc1.64001e" framerate="30" height="360" scantype="progressive" width="640">

        <baseurl>https://x-default-stgec.uplynk.com/aapm/slices/8c1/600e5c27541344a1bf3818617ad712ce/8c1027496a964b049f1bd5895f8f0412/</baseurl>

        <segmenttemplate duration="368640" initialization="https://x-default-stgec.uplynk.com/aapm/slices/8c1/600e5c27541344a1bf3818617ad712ce/8c1027496a964b049f1bd5895f8f0412/$RepresentationID$_init.mp4?pbs=05b6594bcf4b4728ac1094976a80194d&amp;amp;_jt=l&amp;amp;chid=8af651fd7473474f86a05ffb0a1c8972" media="$RepresentationID$$Number%08d$.m4f?pbs=05b6594bcf4b4728ac1094976a80194d&amp;amp;_jt=l&amp;amp;chid=8af651fd7473474f86a05ffb0a1c8972" presentationtimeoffset="254361599" startnumber="690" timescale="90000"></segmenttemplate>

      </representation>

    </adaptationset>

  </period>

  <utctiming schemeiduri="urn:mpeg:dash:utc:http-iso:2014" value="https://content-aaps1.uplynk.com/misc/utcservertime"></utctiming>

</mpd>

I see that the next segment request should be #3955

What i have tried so far

    period.end = 1556104456;

    period.start = 2826;

    availability_start_time = 1556088212;

    max_segment_duration = 4;

    time_shift_buffer_depth = 65

So, first of all, i read DASH-IF-IOP 4.3 section 4.3.4.2 page #82 and implemented the following code :

   int k1 = 1;

int period_duration = period.end - (period.start + data_.availability_start_time);

int k2 = ceil((float)period_duration / (float)data_.max_segment_duration);

double duration = ((float)representation.duration / (float)representation.timeScale);

size_t live_edge = std::min(

    (int)floor((float)((data_.publish_time - data_.availability_start_time - period.start) / duration)), k2);



size_t oldest = std::max(k1, (int)floor((float)((data_.publish_time - data_.availability_start_time - period.start -

                                                    data_.time_shift_buffer_depth) /

                                                duration)));

after calculating everything : k1=1, k2=3355, live_edge=3272 and oldest=3256

Also tried using ffmpeg’s dashdec.c

for min_segment :

if (c->is_live &amp;&amp; pls->fragment_duration)

    {

        num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->time_shift_buffer_depth) * pls->fragment_timescale) / pls->fragment_duration;

    }

for max_segment :

num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time)) * pls->fragment_timescale) / pls->fragment_duration;

after a small modification :

size_t pmax = (((data_.publish_time - data_.availability_start_time))) / duration;

size_t pmin = ((data_.publish_time - data_.availability_start_time) - data_.time_shift_buffer_depth) / duration;

pmin=3946 pmax=3961

in the ffmpeg example, i had to manually remove the first_seq_no variable because it looked like i doubled added the SegmentTemplate@StartNumber.

even after succeeding in this task, how do i exactly build the request list of Segment(NOW) ----> Segment(LIVE_EDGE)

1 | ... | 418 | 419 | 420 | 421 | 422 | 423 | 424 | 425 | 426 | ... | 2951

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Playing 'aes-256-ctr' encrypted DASH stream with FFMPEG/FFPLAY

How to correctly calculate which segments are ready to be downloaded using MPEG-DASH

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