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FAQ: DVS-200

Last Updated: Jan 18, 2018 04:37PM PST
DVS-200 FAQ




Getting Started

Download the Installation Guide from the DVS-200 product page to get started with DVS-200 for free, by setting up a cloud server droplet and installing the free DVS-100 Mode version of the software.


Bandwidth and Audience Size

Page 2 of the Installation Guide provides guidelines for creating a server to accommodate your audience size, but please keep these additional things in mind:

 
  • Bandwidth is more of a limiting factor that CPU and RAM. All Digital Ocean droplets are connected via a shared 1Gbps pipe. Single droplets that exceed 300Mbps may have their speed throttled.
     
  • If using HLS, it works by downloading "chunks" of video (small video files) as quickly as it can. While a single 2.5Mbps RTMP stream will consume 2.5Mbps constantly, a single 2.5Mbps HLS will consume much more for a short period of time and then nothing until it needs the next chunk.
     
  • HLS makes staying under the 300Mbps limit tricky, so Digital Ocean is not recommended for large audiences, it is ideal for distributing to small audiences, or decoders and external CDN's.
     
  • Most cloud providers perform similarly. Even a dedicated server is not the best solution, because if you have a dedicated server with a 1Gbps connection in the United States, it may not give viewers in other countries the same performance.
     
  • The best solution for large audiences is a CDN like Amazon Cloud Front, where the scale is potentially limitless.


Channel Settings Page Issues

If the channel page does not appear to load correctly and you had set your channel to auto-record, delete some recordings and try again. If you stream 24/7, it is recommend to set your recorder settings to manual start and stop to avoid running out of server disk space.


Delayed Event Playback

The DVS-200 will support this in a future update.


Disabling Pause on the Embedded Player

Set the minimum DVR length greater than the HLS playlist length to disable the player's pause function.


Flashing Stream Name From Red to White in the Live Tab

This means that the incoming RTMP connection is connecting and disconnecting.



Hardware Card Support (for NVS-200 and Custom server builds)

The latest support information for Blackmagic and Datavideo PCIe input cards is located on the last page of the Installation Guide. The Linux Blackmagic drivers are located on their website, and the Datavideo drivers have a download link in the guide.

Please note that the Installation Guide recommends Decklink drivers version 10.8.4, but it is no longer available on the Blackmagic support site. Please use 10.8.5.


Hardware Encoding (for NVS-200 and Custom server builds)

DVS-200 encoding is mostly software based, even when using Blackmagic Decklink cards.

It does not support third-party hardware encoding (Intel Quick Sync, GPUs, etc.) at this time.

If you are using Datavideo's own input cards, they have on board H.264 hardware encoding. They are available in 4x SDI, 8x SDI, and 4x HDMI configurations. Please contact sales@datavideo.com for more information.


HLS Auto-play on Apple Devices

Devices with iOS and MacOS use Apple's native HLS decoder. Buffering and playback cannot be controlled on these devices, so auto-play is not supported.


HTTPS Support

If you embed the DVS-200 web player on a website encrypted with HTTPS, you may have playback issues.

To resolve this, you need to install a SSL certificate on your DVS-200 server; this can be uploaded in the system settings.

Assistance with purchasing a SSL certificate is not provided by Datavideo support.



Third Party Embedded Players

The DVS-200 does not directly support third party web players beyond the one included with the web interface.

If you host a third party player on your own site, you can use the HLS URL from your channel with it.


VOD Upload Error

If you try to upload a MP4 or FLV video file and get the following error message:


[File Name] is an invalid file. Only .FLV and .MP4 files are accepted
 

Go to Settings > Server Settings > Media Storage Directory and change it to a valid location on your server. Please see pages 23-24 of the Configuration Guide for more information about this as well as information on setting up another disk for storage.


Web Player Buffers Frequently

Try setting the HLS Fragment Size to 10 sec. This may increase latency but improve stability.


Web Player Will Not Play

It's possible the server is low on disk space due to the size of the system log files. Run the following command via SSH in Terminal:

 
sudo rm/opt/nginx-dvss/logs/*.log

Then click the Restart All Services butting from the DVS-200 settings page.
 

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