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How can I determine the minimum constant internet bandwidth that is theoretically needed for smooth streaming in each video quality levels for Youtube: 480p, 720p and 1080p?
Karolinger
Posted 2012-10-15T02:30:54.493
Reputation: 861
How can I determine the minimum theoretical internet speed needed for smooth streaming in each Youtube video quality?
Answers
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Wikipedia gives bitrate for audio and video for each format, of which there are multiple for a given video resolution. Sum those, add about 20kbit/s to compensate for jitter and encapsulation overhead, and you'd have a decent ballpark.
For example, itag 22, 720p mp4 takes up to about 3 Mbit/s for audio and video together.
Jeremy Sturdivant
Posted 2012-10-15T02:30:54.493
Reputation: 2 108
So I just sum the video bitrate with the audio one and add about 20kbps and voila...? – Karolinger – 2012-10-15T03:35:23.100
1@Karolinger yes, total bandwidth required is video bitrate + audio bitrate. – Mxx – 2012-10-15T06:09:40.823
Youtube might also send some additional information, like ads, video annotations, captions etc., but the bandwidth required for those is mostly negligible compared to the actual video stream. So yes, video and audio bitrates added together is a good enough approximation. – Indrek – 2012-10-15T15:38:31.530
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See this list of Youtube codecs on Wikipedia, it gives the video and audio bitrate for each supported codec and resolution.
– Indrek – 2012-10-15T02:37:05.000