Footage time

[Ruude]

Is there some way of accurately calculating how long (in minutes) an mpeg can be to fit on 4.37GB DVD-R when resolution and average bitrate is known? This so that I can place just enough video in a Studio9 project without having it to be re-rendered.

[Arky]

Is there some way of accurately calculating how long (in minutes) an mpeg can be to fit on 4.37GB DVD-R when resolution and average bitrate is known? This so that I can place just enough video in a Studio9 project without having it to be re-rendered.

Unless I have misunderstood your question, it is impossible to estimate permissible length in the absence of a value for average bitrate. It's like saying how far can I go on a tank of fuel in a Mercedes SLK 230 if I don't know the car's fuel consumption rate.

I'd like to be able to give you the answer you appear to be reuesting, but I don't see how this is possible.


Arky ;o)

[jimmalenko]

Arky,

...and average bitrate is known?

he knows the bitrate.

I can't remeber the exact formula, but try doing a forum seach on bitrate formula.

[Arky]

Arky,

...and average bitrate is known?

he knows the bitrate.

I can't remeber the exact formula, but try doing a forum seach on bitrate formula.

Ooops! my sincere apologies, Ruude - I read your post too quickly and misread 'known' as 'unknown'. I was wrong, hands down

The following may help you:

http://www.dvddemystified.com/files/DVDcalc.xls

Again, please accept my apologies

If this calculator does not help you, then please repost and I'll do my best to help further.

Regards,


Arky ;o)

[johns0]

90 minutes at 6500 kbps=4.37gb with 224 kbps audio
120 minutes at 4800 kbps=4.37gb with 224 kbps audio
150 minutes at 3800 kbps=4.37gb with 224 kbps audio

[Ruude]

90 minutes at 6500 kbps=4.37gb with 224 kbps audio
120 minutes at 4800 kbps=4.37gb with 224 kbps audio
150 minutes at 3800 kbps=4.37gb with 224 kbps audio

What about resolution in this estimate?

[Tommyknocker]

Sorry, resolution is not computed in this formula. It has nothing to do with how big space an MPEG will be versus how long it is.

[Ruude]

Sorry, resolution is not computed in this formula. It has nothing to do with how big space an MPEG will be versus how long it is.

OK, then what about this:

a 4 hour video capped at 480x576 with 4.5 bitrate gives about 11gig
--------- -320x576- -------- 7gig

so resolution is definately a factor no?

[Craig Tucker]

Sorry, resolution is not computed in this formula. It has nothing to do with how big space an MPEG will be versus how long it is.

OK, then what about this:

a 4 hour video capped at 480x576 with 4.5 bitrate gives about 11gig
--------- -320x576- -------- 7gig

so resolution is definately a factor no?

Either the video is shorter or the bitrate is lower. Resolution is not a factor. Bitrate is exactly as the name suggests. The amount of bits of data over time, resolution does not effect this.

[BJ_M]

https://www.videohelp.com/calc

[Ruude]

https://www.videohelp.com/calc

This is nice, but I want to go the other way round.

[BJ_M]

https://www.videohelp.com/calc

This is nice, but I want to go the other way round.

you can use it to figure out either way -- its not hard at all