The Ultimate Guide to VOD Video Renditions & Bitrates on Dacast
What is Bitrate?
Bitrate is the measure of how many bits per second are transferred. A video with a higher bitrate would transfer more data at one time than a video with a lower bitrate. When it comes to broadcasting, bitrate is often measured in megabits per second (Mbps). Faster internet connections can handle larger bitrate streams. Please keep in mind that the higher the bitrate you use, the more bandwidth your stream will consume. In order to create multiple renditions of your video, which would be copies that are a variety of sizes, you must transcode the video. Dacast uses cloud transcoding on uploaded videos.
What is Multi-Bitrate Streaming?
As we mentioned, higher internet speeds can handle streaming at a higher bitrate. On the flip side, lower internet speeds may destroy the quality of a high bitrate stream. A solution to varying internet speeds is multi-bitrate streaming. Multi-bitrate streaming uses multiple video renditions at different bit-rates. Some video players that use multi-bitrate streaming allow users to choose the rendition they’d like to stream. There are also adaptive bitrate video players that automatically choose the best rendition for each viewer based on their internet speed.
Suggested Video Rendition Settings
Below is a table that documents the full details of the output for each VOD rendition.
|Name||Description||Long||Short||FPS (Round Down)||Max Video Bitrate||Max Audio Bitrate||Container||Video Codec||Profile||Audio Codec|
|4k – 2160p||UHD (Ultra High Definition)||3480||2160||25/30/50/60||20 Mbps||128||MP4||H264||High||AAC|
|2k – 1440p||QHD (Quad High Definition)||2560||1440||25/30/50/60||15 Mpps||128||MP4||H264||High||AAC|
|FHD – 1080p||FHD (Full HD)||1920||1080||25/30/50/60||7 Mbps||128||MP4||H264||High||AAC|
|HD – 720p||SHD (Standard HD)||1280||720||25/30/50/60||5 Mbps||128||MP4||H264||High||AAC|
|SD – 480p||FWVGA (Full Wide Video Graphics Array)||854||480||25/29.97/30/50/59.54/60||2 Mbps||128||MP4||H264||Main||AAC|
|LD – 360p||nHD (Ninth of High Definition)||640||360||25/30/50/60||1.5 Mbps||128||MP4||H264||Main||AAC|
|ULD – 240p||WQVGA (Wide Quarter Video Graphics Array)||426||240||25/30/50/60||0.5 Mbps||128||MP4||H264||Main||AAC|
|Magic Encoding||Magic Encoding||N/A||N/A||25/30/50/60||5 Mbps||N/A||MP4||H264||Main||AAC|
|DNE – Do not encode||Do Not Encode||N/A||N/A||N/A||N/A||N/A||N/A||N/A||N/A||N/A|
Other Required Live Encoder Settings
Since bitrate goes and in hand with some other aspects of videos, now is a good time to touch upon encoder settings for streaming on Dacast. The following live encoder settings are required for live streaming with Dacast, regardless of your selected resolution and bitrate:
|VIDEO CODEC||H.264 (x264 may work)|
|FRAME RATE||25 or 30|
|KEYFRAME INTERVAL||2 secs (or 2x frame rate)|
|ENCODING BITRATE||Constant (CBR)|
|AUDIO BITRATE||128 kbps|
|AUDIO CHANNELS||2 (Stereo)|
|AUDIO SAMPLE RATE||48 kHz (48,000 Hz)|
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