Video-bitrate quality..

[lurk00]

I wonder if anyone have a theory or a link to a site where
there is information about bitrate vs TV. What I'm thinking
about is how high bitrate does a normal TV (50Hz/100Hz)
show. Is there a limit or does the picture get better and better
all the way to the top ? There is a maximum of 9.8Mbit/sek for
DVD-video and there are many movies that are encoded in
bitrates above 9000Mbit/sek. The same question goes for
projectors..

Earlier DTS had a maximum bitrate of 1536 kbps but then they
went back to the lab and decided that you don't here any bigger
difference between 1536 and 764 (or somewhere near).
Maybe it's the same considering the videobitrate.. where is the
limit for seeing any improvments !??

// lurk

[DVO]

I happened to read an old article in Computer Video Magzine last night and it said something about TV-broadcast fit 0,5 minutes in 1GB. But it didnt tell how they calculated it.

I'm no expert in the field, but you can calculate the bitrate by (in digital form/sorce) height x with x framerate. This is the uncompressed bitrate/second. The quality of the video depends on the compressor mpeg-1 or mpeg-2, or divx etc.

Adobe has a little guide bout video.
http://www.adobe.com/motion/primers.html

Hope this helps you.

[Craig Tucker]

It depends a lot on the broadcast channel, particularly I notice with cable TV. some of the channels I recieve are obviously starved of bitrate causing obvious macroblocks (worse than VCD). Others are fine

[lordsmurf]

I wonder if anyone have a theory or a link to a site where
there is information about bitrate vs TV. What I'm thinking
about is how high bitrate does a normal TV (50Hz/100Hz)
show. Is there a limit or does the picture get better and better
all the way to the top ? There is a maximum of 9.8Mbit/sek for
DVD-video and there are many movies that are encoded in
bitrates above 9000Mbit/sek. The same question goes for
projectors.. Earlier DTS had a maximum bitrate of 1536 kbps but then theywent back to the lab and decided that you don't here any bigger
difference between 1536 and 764 (or somewhere near).
Maybe it's the same considering the videobitrate.. where is the
limit for seeing any improvments !??
// lurk

Playback and source bit-rate are unrelated. Read the UNDERSTANDING YOUR SOURCE and AVI VS. MPEG pages at www.lordsmurf.com to gain a greater understanding of bitrate needs/limitation (including bloated bitrates) as well as information on analog and digital formats, as well as their interaction as played back on various devices.

Read both of those pages, then post back here if you still need questions answered.

[lurk00]

LordSmurf: cruel site *adding a favorite*

Thank you guys for your fast respons.
I will make a test and re-encode a bit from a movie
and decrease the bitrate and see the transformation
into ugly big pixels.

// lurk