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Originally Posted by thetrueavatar
Btw that's a pity that avstodvd doesn't yet support multi page since there is a next page arrow(in grey) in their tools...
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Where did you see this next page arrow?
The menu capabilities of AVStoDVD rely on BatchMux. The latest version just came out a few weeks ago, and this version does support chapter menus. But it will take some time until MrC will incorporate these new features into AVStoDVD,
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EDIT: with your parameter and a v:qscale:1 I have indeed a bigger file with an overal of 6 363 Kbps which is a little bit to big for my DVD.
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If you use qscale 1 your encode will be purely quality based, you have absolutely no control over the output size. To fill a DVD you must first calculate your desired video bitrate and then use the bitrate and maxbitrate parameters like this:
-b:v 6050000 -maxrate:v 8500000
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BTW do we agree that 2 pass VBR is not better for quality but just to fit the bitrate/size asked ?
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This depends on the kind of 1-pass VBR...
There is a 1-pass VBR method which first does a couple of sample encodes (typically 5% to 10% of the source) to determine the compressibility. Then a CQ (Constant Quality) encode is performed using the quantizer which has been determined by the sample passes. The method was known under the name "Robshot Bach". If you succeed to fill the DVD using this method, then yes, the quality will be very close to a 2-pass VBR encode.
The 1-pass VBR method used by FFMpeg is more like an Average Bitrate method. There are no sample passes. The encode starts with a certain quantizer, and then the quantizer is dynamically adjusted during the encode to achieve the desired bitrate. With this method the bitrate distribution will not be as good, but the method is much faster.
HCenc uses a different 1-pass VBR method. Basically it works like a 2-pass method, but the first pass only encodes a percentage of the source, and the the compression curve which results from this first pass gets smoothed. Bitrate distribution will be less precise than a real 2-pass VBR.
Cheers
manolito