# SRS学习-配置DVR
# 介绍
硬盘录像机（Digital Video Recorder，简称DVR），即数字视频录像机，相对于传统的模拟视频 (opens new window)录像机，采用硬盘录像 (opens new window)，故常常被称为硬盘录像机，也被称为DVR。
它是一套进行图像存储 (opens new window)处理的计算机系统 (opens new window)，具有对图像/语音进行长时间录像、录音 (opens new window)、远程监视 (opens new window)和控制的功能。DVR采用的是数字记录技术，在图像处理、图像储存、检索 (opens new window)、备份 (opens new window)、以及网络传递、远程控制 (opens new window)等方面也远远优于模拟监控设备，DVR代表了电视监控系统 (opens new window)的发展方向，是市面上电视监控系统的首选产品。
之前介绍了如何配置SRS服务，现在需要将摄像头数据存储到硬盘中，作为历史数据方便后续查看。
SRS服务中已经集成了DVR功能，我们可以进行简单的配置来开启服务。
# 配置DVR
SRS-DVR官方文档 (opens new window)
DVR的配置文件：
vhost your_vhost {
# DVR RTMP stream to file,
# start to record to file when encoder publish,
# reap flv/mp4 according by specified dvr_plan.
dvr {
# whether enabled dvr features
# default: off
enabled on;
# the filter for dvr to apply to.
# all, dvr all streams of all apps.
# <app>/<stream>, apply to specified stream of app.
# for example, to dvr the following two streams:
# live/stream1 live/stream2
# default: all
dvr_apply all;
# the dvr plan. canbe:
# session reap flv/mp4 when session end(unpublish).
# segment reap flv/mp4 when flv duration exceed the specified dvr_duration.
# @remark The plan append is removed in SRS3+, for it's no use.
# default: session
dvr_plan session;
# the dvr output path, *.flv or *.mp4.
# we supports some variables to generate the filename.
# [vhost], the vhost of stream.
# [app], the app of stream.
# [stream], the stream name of stream.
# [2006], replace this const to current year.
# [01], replace this const to current month.
# [02], replace this const to current date.
# [15], replace this const to current hour.
# [04], replace this const to current minute.
# [05], replace this const to current second.
# [999], replace this const to current millisecond.
# [timestamp],replace this const to current UNIX timestamp in ms.
# @remark we use golang time format "2006-01-02 15:04:05.999" as "[2006]-[01]-[02]_[15].[04].[05]_[999]"
# for example, for url rtmp://ossrs.net/live/livestream and time 2015-01-03 10:57:30.776
# 1. No variables, the rule of SRS1.0(auto add [stream].[timestamp].flv as filename):
# dvr_path ./objs/nginx/html;
# =>
# dvr_path ./objs/nginx/html/live/livestream.1420254068776.flv;
# 2. Use stream and date as dir name, time as filename:
# dvr_path /data/[vhost]/[app]/[stream]/[2006]/[01]/[02]/[15].[04].[05].[999].flv;
# =>
# dvr_path /data/ossrs.net/live/livestream/2015/01/03/10.57.30.776.flv;
# 3. Use stream and year/month as dir name, date and time as filename:
# dvr_path /data/[vhost]/[app]/[stream]/[2006]/[01]/[02]-[15].[04].[05].[999].flv;
# =>
# dvr_path /data/ossrs.net/live/livestream/2015/01/03-10.57.30.776.flv;
# 4. Use vhost/app and year/month as dir name, stream/date/time as filename:
# dvr_path /data/[vhost]/[app]/[2006]/[01]/[stream]-[02]-[15].[04].[05].[999].flv;
# =>
# dvr_path /data/ossrs.net/live/2015/01/livestream-03-10.57.30.776.flv;
# 5. DVR to mp4:
# dvr_path ./objs/nginx/html/[app]/[stream].[timestamp].mp4;
# =>
# dvr_path ./objs/nginx/html/live/livestream.1420254068776.mp4;
# @see https://github.com/ossrs/srs/wiki/v4_CN_DVR#custom-path
# @see https://github.com/ossrs/srs/wiki/v4_CN_DVR#custom-path
# segment,session apply it.
# default: ./objs/nginx/html/[app]/[stream].[timestamp].flv
dvr_path ./objs/nginx/html/[app]/[stream].[timestamp].flv;
# the duration for dvr file, reap if exceed, in seconds.
# segment apply it.
# session,append ignore.
# default: 30
dvr_duration 30;
# whether wait keyframe to reap segment,
# if off, reap segment when duration exceed the dvr_duration,
# if on, reap segment when duration exceed and got keyframe.
# segment apply it.
# session,append ignore.
# default: on
dvr_wait_keyframe on;
# about the stream monotonically increasing:
# 1. video timestamp is monotonically increasing,
# 2. audio timestamp is monotonically increasing,
# 3. video and audio timestamp is interleaved monotonically increasing.
# it's specified by RTMP specification, @see 3. Byte Order, Alignment, and Time Format
# however, some encoder cannot provides this feature, please set this to off to ignore time jitter.
# the time jitter algorithm:
# 1. full, to ensure stream start at zero, and ensure stream monotonically increasing.
# 2. zero, only ensure stream start at zero, ignore timestamp jitter.
# 3. off, disable the time jitter algorithm, like atc.
# apply for all dvr plan.
# default: full
time_jitter full;
# on_dvr, never config in here, should config in http_hooks.
# for the dvr http callback, @see http_hooks.on_dvr of vhost hooks.callback.srs.com
# @read https://github.com/ossrs/srs/wiki/v4_CN_DVR#http-callback
# @read https://github.com/ossrs/srs/wiki/v4_CN_DVR#http-callback
}
}
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DVR的计划即决定什么时候关闭flv文件，打开新的flv文件，主要的录制计划包括：
- session：按照session来关闭flv文件，即编码器停止推流时关闭flv，整个session录制为一个flv。
- segment：按照时间分段录制，flv文件时长配置为dvr_duration和dvr_wait_keyframe。注意：若不按关键帧切flv（即dvr_wait_keyframe配置为off），所以会导致后面的flv启动时会花屏。
- time_jitter: 时间戳抖动算法。full使用完全的时间戳矫正；zero只是保证从0开始；off不矫正时间戳。
- dvr_path: 录制的路径
示例
vhost __defaultVhost__ {
rtc {
enabled on;
bframe discard;
}
dvr {
enabled on;
dvr_path /home/srs/[app]/[stream]/[2006]/[01]/[02]/[15].[04].[05].[999].flv;
dvr_plan segment;
dvr_duration 600;
dvr_wait_keyframe on;
}
http_remux {
enabled on;
mount [vhost]/[app]/[stream].flv;
}
}
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我这里设置的是10分钟记录一次
记录效果如下所示（tmp是临时文件）
保存成功后的文件为flv格式视频
# 总结
- SRS配置DVR后默认会对所有的视频流进行记录（后面看看能不能指定流进行记录）
- 如果文件存储的太多，可以设置一个定时清理的方法（只保留一个月的视频）