Thumbnail

OvenMediaEngine can generate thumbnails from live streams. This allows you to organize a broadcast list on your website or monitor multiple streams at the same time.

Configuration

Bind

Thumbnails are published via HTTP(s). Set the port for thumbnails as follows. Thumbnail publisher can use the same port number as HLS and DASH.

<Bind>
    <Publishers>
      ...
        <Thumbnail>
            <Port>20080</Port>
            <!-- If you need TLS support, please uncomment below:
            <TLSPort>20081</TLSPort>
            -->
        </Thumbnail>
    </Publishers>
</Bind>

Encoding

To publish thumbnails, you need to set up an encoding profile. You can choose JPG, PNG and WEBP as the format. You can set the Framerate and Resolution. Please refer to the sample below.

<OutputProfiles>
    <OutputProfile>
        <Name>default_stream</Name>
        <OutputStreamName>${OriginStreamName}_preview</OutputStreamName>
        <Encodes>
            <Image>
                <Codec>jpeg</Codec>
                <Framerate>1</Framerate>
                <Width>1280</Width>
                <Height>720</Height>
            </Image>
            <Image>
                <Codec>png</Codec>
                <Framerate>1</Framerate>
                <Width>1280</Width>
                <Height>720</Height>
            </Image>
            <Image>
                <Codec>webp</Codec>
                <Framerate>1</Framerate>
                <Width>1280</Width>
                <Height>720</Height>
            </Image>            
        </Encodes>
    </OutputProfile>
</OutputProfiles>

Property	Description
Codec	Specifies the image codec to use
Width	Width of resolution
Height	Height of resolution
Framerate	Frames per second

Support image codecs

Encode Type	Codec	Codec of Configuration
Image	JPEG	jpeg
	PNG	png
	WEBP	webp

The image encoding profile is only used by thumbnail publishers. and, bypass option is not supported.

Publisher

Declaring a thumbnail publisher. Cross-domain settings are available as a detailed option.

<Publishers>
    ...
    <Thumbnail>
        <CrossDomains>
            <Url>*</Url>
        </CrossDomains>	
    </Thumbnail>
</Publishers>

Get thumbnails

When the setting is made for the thumbnail and the stream is input, you can view the thumbnail through the following URL.

Method	URL Pattern
GET	http(s)://<ome_host>:<port>/<app_name>/<output_stream_name>/thumb.<jpg|png|webp>

Advanced

Keyframes Decoding Only

For use cases without video (re)encoding, OME can be set to only decode the keyframes of incoming streams. This is a massive performance increase when all you are using the encoder for is generating thumbnails.

Supported since OvenmediaEngine version 0.17.2

<OutputProfiles>
<!-- Common setting for decoders. Decodes is optional. -->
	<Decodes>
	<!-- 
	By default, OME decodes all video frames. 
	With OnlyKeyframes, only keyframes are decoded,
	massively improving performance.
	Thumbnails are generated only on keyframes,
	they may not generate at your requested fps!
	-->
		<OnlyKeyframes>true</OnlyKeyframes>
	</Decodes>

    <OutputProfile>
       <Encodes>
           <Video>
                <Bypass>true</Bypass>	
  		   </Video>
           <Image>
               <Codec>jpeg</Codec>
               <Width>1280</Width>
               <Height>720</Height>
               <Framerate>1</Framerate>
          </Image>
       </Encodes>
    </OutputProfile>
</OutputProfiles>

CrossDomains

For information on CrossDomains, see CrossDomains chapter.