Optimizing streaming quality of my encodes... so confused

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markc9

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Hey guys, I'm trying to maximize the quality of my Youtube uploads and find myself struggling. I have no idea what there criteria is when they re-encode your videos; it seems random.

http://support.google.com/youtube/bin/static.py?hl=en&guide=1728585&topic=1728573&page=guide.cs

At first it lists 8,000kbps max bit rate. Anything more than that and it starts compressing. Yet it then lists 50,000kbps as "high quality".

What exactly should I be doing here? If I upload at 15k vs 12k, will the video quality be better? Or does it really not matter between 8-49k, and only matters once you pass 50?

So confused.
 

truegenius

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for uncompressed video at 1920x1080@30fps you need 177mbytesps to maximize the quality, anything higher than that will be useless at specified resolution and fps.
that is for uncompressed format,

but many compressed formats can compress a 100mb video to 10mb with very less quality loss.

Means for compresed video (like mpeg4) you need 18-30 mbytesps for 1920x1080@30fps

for exact answer tell me resolution and recorded fps of your uncompressed recorded video.

(if you are waiting for my reply then my reply can take some time as my email notification is not working and i visit this section rarely)
 

hang-the-9

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Keep stuff at the suggested bit rates, not the high quality ones, unless you want people with normal connections to have issues. Note that it states "for enterprise connections" which is well over the speeds that most people have. Remember that people need to play back the videos, someone with a slower PC and connection will get stuttering during playback.
 

markc9

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My source is 1920x1080@60fps, bitrate is almost 750 mbytes/s

Thanks guys, I'm looking for maximum quality. Main audience will mostly have good connections.

Also, any idea what's a good bit rate to maximize quality on Vimeo?
 

truegenius

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formula to get maximum quality (quality like a uncompressed video)

bitrate required = F x H x W x D.
Where
F for fps captured
H for height of recorded video (in pixels)
W for width of video (in pixels)
D for depth of every frame generally 3 bytes (24bit) (in bytes, i.e, 24bit = 3bytes)

for example
a video at 1920x1080x24bit@60fps will need 1920x1080x24/8x60 bytes = ~356 mega bytes per second of bit rate.

that means if you want to convert that uncompresed video into another format (like mpeg4) then max bitrate required to get max quallity is 356mbps.
 
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