Nginx-rtmp 模块和 mpeg-dash(Dash 行业 dash.js)

Question

Mpeg 短跑流媒体

我正在写关于直播的论文。我使用带有 rtmp 模块的 ffmpeg,ngix 服务器和来自 Dash industry 的 dash.js .我通过 ffmpeg 开始流到服务器，并通过破折号播放，播放器运行良好，但出现了一些问题。

播放器仅在 mpd-dash 播放列表仍然有 block t=0 时播放，因此每当用户请求播放器和 *.mpd 更新时没有 block t=0 播放器都不会运行。

我将我的 *.mpd 文件上传到 Dash Validator并得到错误:“Schematron 验证不成功 – DASH 无效!”。但是播放器是由 nginx - rtmp 模块而不是我生成的。

在搜索了一些论坛后，我得到了一些信息，表明 nginx-rtmp 模块生成错误的破折号播放列表 *.mpd Nginx rtmp module -bug ，并且可能是该错误已修复并合并到github中的master(我认为是Mered - report)。但是我尝试下载最新的 nginx 和 rtmp 模块，播放器也播放不正确。

如果我在 2 年前玩过 dash.all.js 版本:如果播放列表 *.mpd 中存在 block t=0，视频只能播放良好(播放到结束)，或者播放器不播放(在流媒体中间播放)
如果我使用 dash.all.js 持续版本:视频播放并很快停止播放或循环播放。

我真的需要一些帮助，我的截止日期快到了。

这是我的 nginx 配置(主配置):

    rtmp {

    server {
        listen 1935;
        ping 30s;
        notify_method get;
        chunk_size 4000;
        allow play all;

        application myapp {
            live on;
            dash on;
            dash_path /tmp/dash;

            hls on;
            hls_cleanup on;
            hls_sync 100ms;
            hls_fragment 2s;
            hls_path /tmp/hls;

            allow play all;


        }
    }
}

and some others config:

location /hls {
        # Serve HLS fragments
        types {
            application/vnd.apple.mpegurl m3u8;
            video/mp2t ts;
        }
        root /tmp;
        add_header Cache-Control no-cache;
        add_header Access-Control-Allow-Origin *;
    }
    location /dash.js {
        root /usr/share/nginx/html;
    }

    location /streaminghls {
        root /usr/share/nginx/html;
    }

    location /dash {
        # Serve DASH fragments
        root /tmp;
        add_header Access-Control-Allow-Origin *;            

    }

and in html player :

 <script src="dash-old.all.js"></script>

        <script>
            function getUrlVars() {
                var vars = {};
                var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m,key,value) {
                    vars[key] = value;
                });
                return vars;
            }
            function startVideo() {
                var vars = getUrlVars(),
                    url = "http://192.168.100.107:80/dash/Screen.mpd",
                    video,
                    context,
                    player;
                if (vars && vars.hasOwnProperty("url")) {
                    url = vars.url;
                }
                video = document.querySelector(".dash-video-player video");
                context = new Dash.di.DashContext();
                player = new MediaPlayer(context);
                player.startup();
                player.attachView(video);
                player.setAutoPlay(true);
                player.attachSource(url);
            }
        </script>

Hls play excellently but not dash. I tried changing dash config in nginx config and C-source of rtmp-module with recompiling but not thing changed.

My mpd play list :

    <MPD xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:xsi="http://www.w3.org/2011/XMLSchema-instance" type="dynamic" availabilityStartTime="2015-12-17T03:17:07+07:00" availabilityEndTime="2015-12-17T03:18:23+07:00" minimumUpdatePeriod="PT5S" minBufferTime="PT5S" timeShiftBufferDepth="PT0H0M0.00S" suggestedPresentationDelay="PT10S" profiles="urn:hbbtv:dash:profile:isoff-live:2012,urn:mpeg:dash:profile:isoff-live:2011" xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011 DASH-MPD.xsd">
<Period start="PT0S" id="dash">
<AdaptationSet id="1" segmentAlignment="true" maxWidth="320" maxHeight="240" maxFrameRate="20">
<Representation id="Screen_H264" mimeType="video/mp4" codecs="avc1.64000c" width="320" height="240" frameRate="20" sar="1:1" startWithSAP="1" bandwidth="192000">
<SegmentTemplate presentationTimeOffset="0" timescale="1000" media="Screen-$Time$.m4v" initialization="Screen-init.m4v">

<SegmentTimeline>
<S t="0" d="12500"/>
<S t="12500" d="12500"/>
<S t="25000" d="10550"/>
<S t="35550" d="15700"/>
<S t="51250" d="12500"/>
<S t="63750" d="12500"/>
</SegmentTimeline>
</SegmentTemplate>
</Representation>
</AdaptationSet>
<AdaptationSet id="2" segmentAlignment="true">
<AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="1"/>
<Representation id="Screen_AAC" mimeType="audio/mp4" codecs="mp4a.40.2" audioSamplingRate="22050" startWithSAP="1" bandwidth="62000">
<SegmentTemplate presentationTimeOffset="0" timescale="1000" media="Screen-$Time$.m4a" initialization="Screen-init.m4a">
<SegmentTimeline>
<S t="0" d="12500"/>
<S t="12500" d="12500"/>
<S t="25000" d="10550"/>
<S t="35550" d="15700"/>
<S t="51250" d="12500"/>
<S t="63750" d="12500"/>
</SegmentTimeline>
</SegmentTemplate>
</Representation>
</AdaptationSet>
</Period>
</MPD>

I really need help.

Thanks for reading, and am so sorry about my bad english.

Answer 1

虽然此问题已在 nginx-rtmp 中修复，但看起来原始存储库已过时 - 该修复仅在某些 fork 中可用。尝试从 https://github.com/sergey-dryabzhinsky/nginx-rtmp-module 编译 nginx-rtmp或 https://github.com/mattpepin/nginx-rtmp-module - 两者似乎都有修复它的提交。