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Version: 2.11

Video Codecs

In this guide, we’ll explain how to use H.264, VP8, and H.265 (HEVC) video codecs in Ant Media Server.

Currently WebRTC relies on specific codecs for video streaming, and Ant Media Server supports H.264 and VP8 for it.

Protocols like HLS, LL-HLS, and CMAF (Dash) support H.265 codec to provide maximum compatibility and quality options. The WebRTC does not officially support H265 codec for now.

  • While H.264 & VP8 codecs can be enabled directly from the basic application settings, the H.265 codec needs to be enabled from the Advanced settings.

codec-support

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VP8 and H.264 are mandatory in WebRTC as per RFC 7742. However, not all browsers support these codecs at the same time.

  • Each codec can be enabled or disabled based on your requirements. This guide will cover how to enable and configure these codecs in different scenarios.

Enable and Configure H.264 & VP8 Codecs​

In this section, learn about the H264 and VP8 video codecs.

Enable H.264 and VP8 Codec Together​

Both H.264 & VP8 can be enabled in the basic application settings.

h264andvp8

  • SFU Mode (No adaptive bitrate): Ant Media Server can ingest a WebRTC stream in either H.264 or VP8; if both are available, H.264 is prioritized. In this mode, no transcoding occurs, so the original stream is forwarded to players.

  • Adaptive Bitrate Mode (if you have at least one adaptive bitrate): Ant Media Server ingests the stream. It transcodes it into multiple bitrates for both H.264 and VP8 codecs if Adaptive streaming is enabled. This ensures compatibility across devices that support either codec.

Enable Only H.264 Codec​

h264

  • SFU Mode:: Only H.264 streams are ingested and forwarded without transcoding.
  • Adaptive Bitrate Mode: The stream is ingested and transcoded into various H.264 bitrates for adaptive streaming. Devices that support H.264 can then play the stream.

You can check if your device supports H264 at this link.

Enable Only VP8 Codec​

vp8

  • SFU Mode: Only VP8 streams are ingested and forwarded to players.
  • Adaptive Bitrate Mode: VP8 is ingested and transcoded to different bitrates. Note that HLS streaming and MP4 recording will not work if only VP8 is enabled.
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HLS and MP4 recording require H.264 codec. Enabling only VP8 will limit recording (WebM) and playback (WebRTC) options.

Enable and Configure H.265 (HEVC) Codec​

HEVC, also known as H.265, provides better video quality at the same bitrate, making it ideal for bandwidth-sensitive environments.

  1. Enable H.265 in Configuration

H.265 codec support is disabled by default. To enable it, follow these steps:

  • Go to the advanced application settings & set

    "h265Enabled": true,

  • If you set H.264 & VP8 true as well, then AMS will accept the incoming streams with all the video codecs.

  • If H.264 & VP8 are set to false, then AMS will only accept the incoming streams with H.265 codec.

"h264Enabled": false,
"vp8Enabled": false,
"h265Enabled": true,

h265

  • Scroll down & save the settings after making changes.
  1. Send an RTMP Stream to Ant Media Server
  • Use a tool like OBS to send an RTMP stream to the Ant Media Server with H.265 video codec. Check out Enhanced RTMP document for more details.
  1. Play H.265 Stream
  • Most Android devices natively support H.265 playback, so you can play the HLS, LL-HLS, and Dash directly in supported video players. You can use player like VLC or integrate third-party players in your applications to play the H265 encoded stream.
  1. Play H.265 Stream on browsers

The majority of the browsers do not support H.265 playback yet. You can check the H.265 supported browsers.

  • Like H.264 & VP8, H.265 can also be used in both SFU & Adaptive bitrate mode.
  1. Play H.265 transcoded streams with H.264

  • Since H.265 support is limited for browsers and WebRTC, a workaround solution is to enable H.264 & make use of Adaptive streaming to transcode the H.265 ingested stream with H.264.

  • To do this, along with H.265, enable H.264:

"h264Enabled": true,
"h265Enabled": true,
  • Enable at least one adaptive bit rate

h265andh264

  • This will transcode the incoming H.265 coded stream to H.264 codec then browsers and AMS SDKs will be able to play the stream.