pbee

I need to work out the mega bits per second of a mpeg file which is Mega bytes in size.

the size is 73,469 MB and is 9:12 (minutes) long. I need to know the Mb/s

anyone good with that as the numbers i keep coming up with are way off. I know there is overheads in the raw filesize but that isnt important at the moment.

thanks


Peter

Brun

Does 133.0960145mb/s sound anywhere near?

suprabeast

1064.76mb per sec

milo

ok... i think you might be confusing things here which is why your numbers are off.

are you saying that the file takes 9 mins 12 seconds to download, or are you saying it is that long in length?

to work out Mb/s you need to know the *download time*. if it really is 9 mins 12 seconds, it works out like this:

1 MBps = 8 Mbps

so.. your 73,469MB is 587752Mb... which in 552 seconds is around 1064Mbps

suprabeast

beat ya to it milo!!!!

Brun

Guess i should stick to normal maths - non IT related

pbee

nope i would be expecting figure around 5.0Mb/s or maybe less.

9:12 is the length of the mpeg 2 file mpeg is measure in mega bits per second not bytes.

I have found a unix tool for getting the date

bitrate=4573600 bits/second
presentation rate=1000
frames/sec(* 1000)=25000
274 tags in tag file.
width: 720, height: 576, pel aspect ratio (* 10000): 9375
MPEG2 Tagfile version: 1.3
Current MPEG2 code is version 1.3, back-compatible to 1.1
PAT is 16 bytes starting at offset 0 of compression data
PMT is 26 bytes starting at offset 16 of compression data
sequence header is 86 bytes starting at offset 42 of compression data
video PID = 4130, audio PID = 4131
video elementary stream = 224
PCR's are found on PID 4130

so that makes it 4.57Mb/s.

thanks anyways I couldnt figure out the calcualtor maths behind it either