9.6 0818 2019
1. Change src/device default H5_ALWAYS to H5_ONDEMAND.
2. Add stream=main and stream=sub for ONVIF and HIVISION SDK/DAHUA SDK.
3. Add stream select(main sub) in h5sconsole.
4. Add GetSrcWithoutDevice API to get all camera which added to h5s.
5. Add autoplay in pbconf for playback from device without call start() after connect().
6. Cloud mode support dynamic  channel change.
7. Device SDK  channel support cloud push.
8. Fix playback playtime callback can't work issue.

9.5 0805 2019
1. SearchDeviceRecordByTime from HIKVISION SDK time range split by 15mins
2. Add a configure to force load all the channel of Device.
3. Fix some time Linux Media SDK for GPU transcoding crash issue.
4. Fix ManualRecordStart with alwayscreate can't stop issue.
5. Fix RTMP push some time already publishing issue.
6. Fix Archive doesn't have audio issue.

9.4 0720 2019
1. Fix HIKVISION SDK playback pasue close lock issue.
2. Add file extension to the strFileName in the record reply.
3. Add Archive speed control parameter, max is x16. Support 1 2 4 8 16.
5. Record and Archive support H.265 in mp4.
6. H5S server playback support by filename, and support H.265 transcoding.
7. Add H265 snapshot and Getimage JPEG support.
8. Change DAHUA SDK playback time to ISO8601 format.
9. Fix some time GB28181 callid changed when there no reboot online/offline issue.

h5stream 提供了抓图功能，但该抓图是在h5stream 服务端进行，并且为了不影响h5stream 的运行性能，h5s只读取了I帧，所以有一定的时延，能不能在浏览器端直接抓一个png图片么，答案是可以的，新的版本已经把该功能集成到了h5sconsole, 并在h5splayerhelper.js 中加入了该函数。

可以参考如下代码, 也可以参考h5sconsole 的代码 https://github.com/linkingvision/h5sconsole/blob/master/src/components/widgets/liveplayer.vue