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Exemple de boutons d’action pour une collection collaborative
27 février 2013, par
Mis à jour : Mars 2013
Langue : français
Type : Image
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Exemple de boutons d’action pour une collection personnelle
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Mis à jour : Février 2013
Langue : English
Type : Image
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Administration > Configuration des masques de formulaire.
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Sur d’autres sites (9115)
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FFMPEG, Creating an MPEG-DASH stream with existing inputs
10 septembre 2019, par kitenseiI am trying to generating a
DASH .mpdfile 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 : SoundHandlerAnd 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.mpdThe generated
mpdfile :<?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 -
mpeg dash on wowza server not working, status error 404 Not Found
10 septembre 2015, par jobinadaptives links for mpeg dash on wowza server not working with me, the following are the steps that I used to publish video on wowza :
- I install and configure Wowza server, and I tested it and it is working fine.
-
Transcode this video using ffmepg (I bring these command from wowza documentation)
-
I test the files and all of them workig fine then I moved these files to wowza content folder and create the smil file as following :
<?xml version="1.0" encoding="UTF-8"?>
<smil title="sintel">
<switch>
<video width="320" height="180" src="sintel_320p.mp4" systemlanguage="eng">
</video>
<video width="640" height="360" src="sintel_640p.mp4" systemlanguage="eng">
</video>
<video width="320" height="180" src="sintel_400p.mp4" systemlanguage="eng">
</video>
<video width="420" height="270" src="sintel_700p.mp4" systemlanguage="eng">
</video>
<video width="720" height="406" src="sintel_1100p.mp4" systemlanguage="eng">
</video>
<video width="1024" height="576" src="sintel_1300p.mp4" systemlanguage="eng">
</video>
<video width="1080" height="608" src="sintel_1500p.mp4" systemlanguage="eng">
</video>
</switch>
</smil>- I use the mpd file (http://191.237.26.137:1935/vod/smil:sintel.smil/manifest.mpd) with http://www.jwplayer.com/innovation/roadmap/mpeg-dash/
Result : the video work for first few seconds the stop
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Live streaming : node-media-server + Dash.js configured for real-time low latency
7 juillet 2021, par MaorationWe're working on an app that enables live monitoring of your back yard.
Each client has a camera connected to the internet, streaming to our public node.js server.



I'm trying to use node-media-server to publish an MPEG-DASH (or HLS) stream to be available for our app clients, on different networks, bandwidths and resolutions around the world.



Our goal is to get as close as possible to live "real-time" so you can monitor what happens in your backyard instantly.



The technical flow already accomplished is :



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ffmpeg process on our server processes the incoming camera stream (separate child process for each camera) and publishes the stream via RTSP on the local machine for node-media-server to use as an 'input' (we are also saving segmented files, generating thumbnails, etc.). the ffmpeg command responsible for that is :



-c:v libx264 -preset ultrafast -tune zerolatency -b:v 900k -f flv rtmp://127.0.0.1:1935/live/office -
node-media-server is running with what I found as the default configuration for 'live-streaming'



private NMS_CONFIG = {
server: {
 secret: 'thisisnotmyrealsecret',
},
rtmp_server: {
 rtmp: {
 port: 1935,
 chunk_size: 60000,
 gop_cache: false,
 ping: 60,
 ping_timeout: 30,
 },
 http: {
 port: 8888,
 mediaroot: './server/media',
 allow_origin: '*',
 },
 trans: {
 ffmpeg: '/usr/bin/ffmpeg',
 tasks: [
 {
 app: 'live',
 hls: true,
 hlsFlags: '[hls_time=2:hls_list_size=3:hls_flags=delete_segments]',
 dash: true,
 dashFlags: '[f=dash:window_size=3:extra_window_size=5]',
 },
 ],
 },
},



} ;
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As I understand it, out of the box NMS (node-media-server) publishes the input stream it gets in multiple output formats : flv, mpeg-dash, hls.
with all sorts of online players for these formats I'm able to access and the stream using the url on localhost. with mpeg-dash and hls I'm getting anything between 10-15 seconds of delay, and more.











My goal now is to implement a local client-side mpeg-dash player, using dash.js and configure it to be as close as possible to live.



my code for that is :







 
 
 
 
 
 <div>
 <video autoplay="" controls=""></video>
 </div>
 <code class="echappe-js"><script src="https://cdnjs.cloudflare.com/ajax/libs/dashjs/3.0.2/dash.all.min.js"></script>

<script>&#xD;&#xA; (function(){&#xD;&#xA; // var url = "https://dash.akamaized.net/envivio/EnvivioDash3/manifest.mpd";&#xD;&#xA; var url = "http://localhost:8888/live/office/index.mpd";&#xD;&#xA; var player = dashjs.MediaPlayer().create();&#xD;&#xA; &#xD;&#xA; &#xD;&#xA;&#xD;&#xA; // config&#xD;&#xA; targetLatency = 2.0; // Lowering this value will lower latency but may decrease the player&#x27;s ability to build a stable buffer.&#xD;&#xA; minDrift = 0.05; // Minimum latency deviation allowed before activating catch-up mechanism.&#xD;&#xA; catchupPlaybackRate = 0.5; // Maximum catch-up rate, as a percentage, for low latency live streams.&#xD;&#xA; stableBuffer = 2; // The time that the internal buffer target will be set to post startup/seeks (NOT top quality).&#xD;&#xA; bufferAtTopQuality = 2; // The time that the internal buffer target will be set to once playing the top quality.&#xD;&#xA;&#xD;&#xA;&#xD;&#xA; player.updateSettings({&#xD;&#xA; &#x27;streaming&#x27;: {&#xD;&#xA; &#x27;liveDelay&#x27;: 2,&#xD;&#xA; &#x27;liveCatchUpMinDrift&#x27;: 0.05,&#xD;&#xA; &#x27;liveCatchUpPlaybackRate&#x27;: 0.5,&#xD;&#xA; &#x27;stableBufferTime&#x27;: 2,&#xD;&#xA; &#x27;bufferTimeAtTopQuality&#x27;: 2,&#xD;&#xA; &#x27;bufferTimeAtTopQualityLongForm&#x27;: 2,&#xD;&#xA; &#x27;bufferToKeep&#x27;: 2,&#xD;&#xA; &#x27;bufferAheadToKeep&#x27;: 2,&#xD;&#xA; &#x27;lowLatencyEnabled&#x27;: true,&#xD;&#xA; &#x27;fastSwitchEnabled&#x27;: true,&#xD;&#xA; &#x27;abr&#x27;: {&#xD;&#xA; &#x27;limitBitrateByPortal&#x27;: true&#xD;&#xA; },&#xD;&#xA; }&#xD;&#xA; });&#xD;&#xA;&#xD;&#xA; console.log(player.getSettings());&#xD;&#xA;&#xD;&#xA; setInterval(() => {&#xD;&#xA; console.log(&#x27;Live latency= &#x27;, player.getCurrentLiveLatency());&#xD;&#xA; console.log(&#x27;Buffer length= &#x27;, player.getBufferLength(&#x27;video&#x27;));&#xD;&#xA; }, 3000);&#xD;&#xA;&#xD;&#xA; player.initialize(document.querySelector("#videoPlayer"), url, true);&#xD;&#xA;&#xD;&#xA; })();&#xD;&#xA;&#xD;&#xA; </script>
 








with the online test video (https://dash.akamaized.net/envivio/EnvivioDash3/manifest.mpd) I see that the live latency value is close to 2 secs (but I have no way to actually confirm it. it's a video file streamed. in my office I have a camera so I can actually compare latency between real-life and the stream I get).
however when working locally with my NMS, it seems this value does not want to go below 20-25 seconds.



Am I doing something wrong ? any configuration on the player (client-side html) I'm forgetting ?
or is there a missing configuration I should add on the server side (NMS) ?


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