Average bitrate??

[lilhobo]

Whats the av bitrate is viewable for a 700Mb file?


also how big is an AC3 soundtrack from a av 90min film?

[setarip_old]

Hi!

Your first question is not answerable...

Your second question is a duplicate of the one you posted in the "General" sub-forum...

[lilhobo]

well whats a reasonable bitrate for the 700-1000 range?

[nurbs]

Your question can not be answered. Filsize = Bitrate * Runtime. 1 equation with 2 unknown elements can't be solved. What bitrate will give good quality also depends on the resolution you encode to, the codec you use and the complexity of the source.

[citanuL]

IMHO?,
Maybe avg runtime for movies is somewhere around 80-120min? So 700MB/100min=7MB/min=955.73kbps video+audio [7 x 1024 x 8 / 60]. Quality of output will depend alot on chosen resolution.
AC3 [spectacular audio] seems to tend to be 224kbps for 2 channel and 448kbps for 5.1 [spectacular surround sound audio]? So 224kbps x 60sec per min / 1024kilo per mega / 8bits per Byte x 90min = 147.66MB [almost 2x larger than 128kbps MP3 [avg audio]]
Maybe good/above avg resolutions are?:
4:3 1.33 512x384
14:9 1.55 544x352
16:9 1.77 624x352 or 640x352[or x368]
1.85 704x384
2.35 720x304
Maybe good avg video bitrates are 850-1050kbps for XviD mpeg-4 ASP
Maybe good avg audio bitrates are 112-160kbps for ABR MP3
A movie like Transformers [144min] with complex video scenes can use alot of bitrate [1200[mp3]-1600MB[original DTS] range]

Thoughts/corrections/advice/additions anyone?