94 lines
3.3 KiB
Markdown
94 lines
3.3 KiB
Markdown
---
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title: RTMP ATC
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sidebar_label: RTMP ATC
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hide_title: false
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hide_table_of_contents: false
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---
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# ATC Deploy
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How to deploy RTMP fault backup? When origin for edge restart, edge will
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switch to another origin, so it is easy to config fault tolerance for edge,
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only need to specifies multiple origin servers.
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How to deploy HLS fault backup? When edge can not got a piece of ts, it
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will fetch from another origin server, so the ts in these two server must
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be absolutely equals. We must use atc for HLS/HDS which over http file stream.
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For the deploy of HDS/HLS, read [Adobe: HDS/HLS fault backup](http://www.adobe.com/cn/devnet/adobe-media-server/articles/varnish-sample-for-failover.html):
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```bash
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+----------+ +----------+
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+--ATC->-+ server +--ATC->-+ packager +-+ +---------+
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+----------+ | RTMP +----------+ RTMP +----------+ | | Reverse | +-------+
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| encoder +->-+ +->-+ Proxy +-->-+ CDN +
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+----------+ | +----------+ +----------+ | | (nginx) | +-------+
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+--ATC->-+ server +--ATC->-+ packager +-+ +---------+
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RTMP +----------+ RTMP +----------+
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```
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The RTMP is in ATC, the absolute time, so server or other tools can output
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HLS in multiple tools.
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## Config ATC on SRS
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ATC of SRS is default off, the RTMP timestamp to client always start at 0.
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```bash
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vhost __defaultVhost__ {
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# for play client, both RTMP and other stream clients,
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# for instance, the HTTP FLV stream clients.
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play {
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# vhost for atc for hls/hds/rtmp backup.
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# generally, atc default to off, server delivery rtmp stream to client(flash) timestamp from 0.
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# when atc is on, server delivery rtmp stream by absolute time.
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# atc is used, for instance, encoder will copy stream to master and slave server,
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# server use atc to delivery stream to edge/client, where stream time from master/slave server
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# is always the same, client/tools can slice RTMP stream to HLS according to the same time,
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# if the time not the same, the HLS stream cannot slice to support system backup.
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#
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# @see http://www.adobe.com/cn/devnet/adobe-media-server/articles/varnish-sample-for-failover.html
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# @see http://www.baidu.com/#wd=hds%20hls%20atc
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#
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# default: off
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atc off;
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}
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}
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```
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## ATC for Adobe Flash Player
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When ATC is on, flash will start play ok when:
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* sequence header: The timstamp of sequence header must equals to the first packet.
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* metadata: The timstamp of metadata must equals to the first packet.
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We test the flash player, it ok to play the RTMP stream with or without ATC.
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## ATC for encoder
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The encoder can control the atc of SRS, when encoder write a field
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"bravo_atc":"true".
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We can disable this feature:
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```bash
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vhost atc.srs.com {
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# for play client, both RTMP and other stream clients,
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# for instance, the HTTP FLV stream clients.
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play {
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# whether enable the auto atc,
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# if enabled, detect the bravo_atc="true" in onMetaData packet,
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# set atc to on if matched.
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# always ignore the onMetaData if atc_auto is off.
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# default: off
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atc_auto off;
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}
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}
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```
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Winlin 2014.11
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