ABR and Transcoding
OvenMediaEngine has a built-in live transcoder. The live transcoder can decode the incoming live source and re-encode it with the set codec or adjust the quality to encode at multiple bitrates.
Supported Video, Audio and Image Codecs
OvenMediaEngine currently supports the following codecs:
Type | Decoder | Encoder |
---|---|---|
Video | VP8, H.264, H.265 | VP8, H.264, H.265(GPU only) |
Audio | AAC, OPUS | AAC, OPUS |
Image | JPEG, PNG |
OutputProfiles
OutputProfile
The <OutputProfile>
setting allows incoming streams to be re-encoded via the <Encodes>
setting to create a new output stream. The name of the new output stream is determined by the rules set in <OutputStreamName>
, and the newly created stream can be used according to the streaming URL format.
According to the above setting, if the incoming stream name is stream
, the output stream becomes stream_bypass
and the stream URL can be used as follows.
WebRTC
ws://192.168.0.1:3333/app/stream_bypassLLHLS
http://192.168.0.1:8080/app/stream_bypass/llhls.m3u8
Encodes
Video
You can set the video profile as below:
The meaning of each property is as follows:
Property | Description |
Codec* | Specifies the |
Bitrate* | Bit per second |
Name | Encode name for Renditions |
Width | Width of resolution |
Height | Height of resolution |
Framerate | Frames per second |
Preset | Presets of encoding quality and performance |
ThreadCount | Number of threads in encoding |
Table of presets
A table in which presets provided for each codec library are mapped to OvenMediaEngine's presets. Slow presets are of good quality and use a lot of resources, whereas Fast presets have lower quality and better performance. It can be set according to your own system environment and service purpose.
Presets | openh264 | libvpx | h264/265 NVC | h264/265 QSV |
slower | Quantizer(10-41) | best | hq | - |
slow | Quantizer(10-41) | best | llhq | - |
medium | Quantizer(10-51) | good | bd | - |
fast | Quantizer(25-51) | realtime | hp | - |
faster | Quantizer(25-51) | *realtime | *llhp | - |
References
https://trac.ffmpeg.org/wiki/Encode/VP8
https://docs.nvidia.com/video-technologies/video-codec-sdk/nvenc-preset-migration-guide/
Audio
You can set the audio profile as below:
The meaning of each property is as follows:
Property | Description |
Codec* | Specifies the |
Bitrate* | Bits per second |
Name | Encode name for Renditions |
Samplerate | Samples per second |
Channel | The number of audio channels |
It is possible to have an audio only output profile by specifying the Audio profile and omitting a Video one.
Image
You can set the Image profile as below:
The meaning of each property is as follows:
Property | Description |
Codec | Specifies the |
Width | Width of resolution |
Height | Height of resolution |
Framerate | Frames per second |
The image encoding profile is only used by thumbnail publishers. and, bypass option is not supported.
Bypass without transcoding
You can configure Video and Audio to bypass transcoding as follows:
You need to consider codec compatibility with some browsers. For example, chrome only supports OPUS codec for audio to play WebRTC stream. If you set to bypass incoming audio, it can't play on chrome.
WebRTC doesn't support AAC, so if video bypasses transcoding, audio must be encoded in OPUS.
Keep the original with transcoding
If you want to transcode with the same quality as the original. See the sample below for possible parameters that OME supports to keep original. If you remove the Width, Height, Framerate, Samplerate, and Channel parameters. then, It is transcoded with the same options as the original.
Rescaling while keep the aspect ratio
To change the video resolution when transcoding, use the values of width and height in the Video encode option. If you don't know the resolution of the original, it will be difficult to keep the aspect ratio after transcoding. Please use the following methods to solve these problems. For example, if you input only the Width value in the Video encoding option, the Height value is automatically generated according to the ratio of the original video.
Adaptive Bitrates Streaming (ABR)
From version 0.14.0, OvenMediaEngine can encode same source with multiple bitrates renditions and deliver it to the player.
As shown in the example configuration below, you can provide ABR by adding <Playlists>
to <OutputProfile>
. There can be multiple playlists, and each playlist can be accessed with <FileName>
.
The method to access the playlist set through LLHLS is as follows.
http[s]://<domain>[:port]/<app>/<stream>/
<FileName>
.m3u8
The method to access the Playlist set through WebRTC is as follows.
ws[s]://<domain>[:port]/<app>/<stream>/
<FileName>
Note that <FileName>
must never contain the playlist
and chunklist
keywords. This is a reserved word used inside the system.
To set up <Rendition>
, you need to add <Name>
to the elements of <Encodes>
. Connect the set <Name>
into <Rendition><Video>
or <Rendition><Audio>
.
In the example below, three quality renditions are provided and the URL to play the abr
playlist as LLHLS is https://domain:port/app/stream/abr.m3u8
and The WebRTC playback URL is wss://domain:port/app/stream/abr
Supported codecs by streaming protocol
Even if you set up multiple codecs, there is a codec that matches each streaming protocol supported by OME, so it can automatically select and stream codecs that match the protocol. However, if you don't set a codec that matches the streaming protocol you want to use, it won't be streamed.
The following is a list of codecs that match each streaming protocol:
Protocol | Supported Codec |
WebRTC | VP8, H.264, Opus |
LLHLS | H.264, AAC |
Therefore, you set it up as shown in the table. If you want to stream using LLHLS, you need to set up H.264 and AAC, and if you want to stream using WebRTC, you need to set up Opus.
Also, if you are going to use WebRTC on all platforms, you need to configure both VP8 and H.264. This is because different codecs are supported for each browser, for example, VP8 only, H264 only, or both.
However, don't worry. If you set the codecs correctly, OME automatically sends the stream of codecs requested by the browser.
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