On the research of the compression settings good for send clips

Hi all

I want an easy way to send something I usually work no matter what, up to 60 seconds.

Some settings of copy editing using wizards to send customers here is that I have:

Target for the size of the end of the clip to be close to, but not more than 5MB.

Use the Sor 3 426 x 240 (for 16:9)

22,050 16-bit mono audio

I thought I could use these settings for all the clips, then I could limit the size of different lengths by changing the data rate.

I thought that if I divide 5000 the number of seconds of the clip he would give me a K/sec data rate, which would then keep the size about 5 MB.

I was wondering if I have all this right? or if anyone has any other advice?

Do some testing, I found 60 sec @85 K/sec gave 4.9 MB which sounds right.

But 60 sec @ 250 K/s has given 8.3 MB which is less than I thought. (edition assistants say they often use 250 K/sec for 60 s and get 5MB!)

Can someone explain this to me?

As I say, the whole point of this is to able to quickly work settings allowing to produce QT.

Cheers

Forget it... I know that sounds harsh, but it's the only honest answer. CoDecs that use their share variable bitrate, time variable extends on and several levels of spatial compression are literally mathematically unpredictable - you do not know the result until you have run the clip through the algorithm. The effective data rate depends on too much of the content of the image. That is why in the encoders, we always call him 'target bitrate' exit not final bitrate. Only CoDecs that use fixed matrices, at regular intervals and clearly structured video compression algorithms can be calculated as MPEG-2 and H.264, but still there is always a minor variability and uncertainty. It may not be practical, but test the settings for each clip is about the only way, if you need to reach a file size. As a general rule, you can base your rough estimates of the lower third to size / data rate, i.e. If you need 5 MB files, target your settings to 3.5 MB.

Mylenium

Tags: After Effects

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