Re: One last time: MP4 bitrate calculator?

With a little use of Windows Calculator you can calculate any bitrate.
The basics are;
1. The size of video files sitting on your hard drive or this upload limit you have in question are measured in kilobytes, megabytes and gigabytes. Emphasizing BYTES.

2. The amount of data in one second of video or audio (or both) is measured in kilobits or megabits. Emphasize BITS.

3. 8 bits equals 1 byte.
4. Kilo=1,000 Mega=1,000,000

Note; bitrate is expressed as mbps megabits per second) or kbps (kilbits per second). Example; a good DVD bitrate might be 7 mbps or 7000 kbps (both are the same).

Ok, now for real life calculations. Your limit of 500 megabytes weekly involves plugging in one of 2 unknown values- the length of video in seconds OR the amount of data per second.

Lets begin with the unknown bitrate and plug it in as 500 kbps (which is ok for folks on a cable connection and half resolution-480x360). At some point in any of these calculation one must convert bits to bytes. 500 kilobits equals 62 kilobytes.

500 megabytes (500,000,000) (your limit) divided by 62 kilobytes (62,000) equals 8064 seconds OR/134 minutes.

So we can say if your total bitrate (video+audio) is 500 kbps, your 500 megabyte limit equals 134 minutes.

Now it does not make much sense to plug in duration as the unknown because the longer duration is, the lower the bitrate is and I guess you would like to have decent looking video.

In conclusion and in general, a good place to start is 500 kbps= 134 minutes. Twice that (1000 kbps) would be good for full resolution video and audio and half of 134 minutes.