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| kesohombre |
| Posted: Sep 3 2002, 11:57 PM |
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is there a tutorial or guide on calculating bitrate when setting up compression?  |
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| SillKotscha |
| Posted: Sep 4 2002, 12:39 AM |
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smart Moderator
Group: Moderators
Posts: 146
Member No.: 6
Joined: 7-July 02
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use GKnot
go to 'Bitrate tab':
- enter the length of your movie
- choose your audio bitrate by using the dropp-down button (or even better: first transcode your audio stream and then load your encoded stream into GKnot)
- calculate your frame overhead by hitting the right spot
- and finally look over to the line: Average Bitrate
that's it...
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"Have you ever noticed that whenever Microsoft calls something 'Smart', it's definitely a feature you want to disable!" |
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| Morcok |
| Posted: Sep 4 2002, 12:06 PM |
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and in case of bidirectionnal encoding ? (i think it isn't constant, but maybe...) |
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| SillKotscha |
| Posted: Sep 4 2002, 12:14 PM |
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smart Moderator
Group: Moderators
Posts: 146
Member No.: 6
Joined: 7-July 02
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good point but a miscalculation of ~1MB is acceptable 
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"Have you ever noticed that whenever Microsoft calls something 'Smart', it's definitely a feature you want to disable!" |
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| ProfDrMorph |
| Posted: Sep 4 2002, 09:10 PM |
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| QUOTE (Morcok @ Sep 4 2002, 02:06 PM) | | and in case of bidirectionnal encoding ? (i think it isn't constant, but maybe...) |
B-Frames have nothing to do with the bitrate ( or at least they shouldn't have in theory; a bad B-Frame implementation may influence the bitrate though )
it's VBR what causes "miscalculation" but modern VBR algorithms work precisly enough so even VBR shouldn't be a problem. Like Sill said: 1mb shouldn't really matter. |
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