BEST DVD BITRATE?

I have problems with Mac and stand-alone DVD players 'pixellating', stopping, starting etc when playing discs showing max bitrate (9000+ kbps), especially if autolooping for a while. Nevertheless, some experts claim higher is better.

Using Toast 8 from, say, an iMovie project often produces an average DVD bitrate of only 6500 - 7000 kbps but the discs play OK. Can someone clarify the pros and cons of preferred bitrates (difficult to find anything on the web)?

Though one site says:
"...it's often best to use a low bitrate and generally-speaking, when recording to DVD-R/RW or DVD+R/RW you should keep the video bitrate below 7Mbps.... Some experts on DVD production even suggest keeping the maximum MPEG-2 bitrate at 6Mbps..."

Intel iMac 24" 2.16Ghz 2GB, Mac OS X (10.4.10), G4 OS9

Posted on Aug 21, 2007 7:31 AM

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11 replies

Aug 22, 2007 4:27 AM in response to David S.

Thanks.
What's the best bitrate for over 60 minutes then? (though I rarely have anything that long).

I use Toast 8 Titanium set to Automatic encoding with Video Quality set to Best. It seems to come up with variable 6 - 8 Mbits on most discs.
And, by the way, VLC info tells me these Toast discs are video codec 'mpgv', and audio: 'ac52' (Dolby). Is this good or not so good..?

I am pretty impressed with the results so far but wonder how these discs will look projected.

Why is it some 'experts' insist the highest bitrate is best? (I see most commercial pressed DVDs are 8 - 9+ bitrate)

Maybe I should start playing around with Toast's Custom settings? ..huh, too scary.

Message was edited by: prof d hall

null

Aug 22, 2007 5:18 AM in response to prof d hall

Hi:

I don't know if you'll get too much info here about creating your DVDs using Toast as encoder, this is the DVD Studio pro forum and most of us use Compressor to encode movies and DVDSP to author our discs.

Why is it some 'experts' insist the highest bitrate is best? (I see most commercial pressed DVDs are 8 - 9+ bitrate)


Probably they refer to the total bitrate: audio + video bitrate.

Hope that helps !

User uploaded file
Alberto

Aug 22, 2007 5:28 AM in response to prof d hall

Why is it some 'experts' insist the highest bitrate is best? (I see most commercial pressed DVDs are 8 - 9+ bitrate)


That's because those are, as you mention, commercial, pressed discs - those same rules do not apply to DVD-Rs (which are more prone to making players choke).

And, just to clarify, the post that Silal pointed you to mentions that is you go Variable Bit Rate, you should keep at a 1.5 Mbps difference (otherwise, go CBR) but that is not actually the sweet spot, per se, when it comes to encoding. The sweet spot - at least as far as Compressor is concerned - is to have a 3 Mbps difference. The theory behind VBR is that average should be about ½ of the Max Bit Rate. If you did that with most software encodes meant for DVD-R output, that would mean a 3.7 Mbps average, a touch too low in most instances (too much information is thrown out).

Personally, I use 4.5/7.5 has my average/max but I also use Compressor exclusively. Not sure how - or even if - this translates to Toast.

Aug 22, 2007 5:59 AM in response to hanumang

Thanks both - of course I maybe shouldn't be asking questions here, but hey, I need the experts advice.

I've saved your first post on this hanumang - invaluable! But when you say 1.5 difference you mean at least, or at most, in VBR? I Guess at least because of your 'sweet' spot 3 Mbps?

I don't think Toast on 'Automatic' is far off your preferred av. max.

(I really have a bone to pick with some non-forum 'expert' advisor!)

Aug 22, 2007 6:26 AM in response to prof d hall

Hey, I'm happy to help. 🙂 Let me clarify the whole VBR thing.

Just like you, many folks get advice that more is better when it comes to bitrate. That's good advice, but bad if taken too far. Another piece of advice that gets misconstrued is that VBR is better. It usually is, but not always.

Combining the two, you'll come across well-intentioned folks who do 8.0/8.5 average/max encodes. That's a bad idea, in my book.

1.5 Mbps is the bare minimum difference that you should be using if you do a VBR encode. In other words, if someone is doing a 6.5/7.5 encode, they really should be doing a 6.5 constant bit rate encode.

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