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New MMBforums • View topic - Optimum settings for authoring

Optimum settings for authoring

DVD-lab, DVD-lab Studio and DLP2

Re: Optimum settings for authoring

Postby Vapymid » Thu Oct 28, 2010 12:46 pm

What size is you subtitle stream? Usually they are too small to worry about...

Regards
Vapymid
 
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Re: Optimum settings for authoring

Postby neilwilkes » Mon Nov 15, 2010 12:57 pm

Mpeg audio is something that should ideally never be used - it's horrible beyond the power of mere words to describe!

For bit budgeting, I have an excellent XLS format spreadsheet that will do everything you need with regard to planning & encoding.
Please send me a PM to get a copy....
http://www.opusproductions.com
http://www.so-audio.com
high resolution and surround sound specialists
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Re: Optimum settings for authoring

Postby riredale » Sun Jan 09, 2011 4:39 pm

Coming late to this thread, but wanted to mention that it's really easy to calculate bitrates.

For a DVD-5 blank, just use the formula "600 / X = bitrate" where X is the length of the video in minutes and "bitrate" is the combined video and audio bitrate.

So for example if I have a 90 minute project, 600 / 90 = 6.67. That means my maximum bitrate has to be 6.67 or under. Assuming I use AC-3 audio (192 kb/sec or roughly .2 mb/sec) then my maximum video bitrate has to be 6.67- 0.2 = 6.47 mb/sec.

At that rate one should use a good MPEG2 encoder with VBR. CBR at 6.5 mb/sec will show motion artifacts in fast-moving scenes. I would use min=0.5, max=9, avg=6.5.

I've done maybe a hundred DVD projects using CinemaCraft and MainConcept encoders and this simple formula works great.
riredale
 
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Re: Optimum settings for authoring

Postby neilwilkes » Wed Jan 26, 2011 6:44 am

http://www.opusproductions.com
http://www.so-audio.com
high resolution and surround sound specialists
neilwilkes
 
Posts: 73
Joined: Mon Nov 15, 2010 12:50 pm
Location: London, England

Re: Optimum settings for authoring

Postby Vapymid » Wed Jan 26, 2011 7:25 am

:)

Actually, we don't differ at all. For music.

For home movie projects though, which I assume is what Ian was working on, LPCM is just a wasted space on DVD.

Regards
Vapymid
 
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Location: London, UK

Re: Optimum settings for authoring

Postby Ian Bell » Thu Jan 27, 2011 8:52 am

Hi guys,

I think I started something with my original post. Great to get all the comments which I have taken on board. While I'm here I thought I would ask something else.

I have downloaded an 8 minute MP4 file. It is in HD (1920 x 1080). What would be the best way to convert it to burn to a DVD. I first tried to convert it to .avi by using software called ' Pazera Video Converter Suite' which has a Free MP4 to AVI converter section, by using MPG - DVD PAL: MPEG2 AC3 but it went from 1920 x 1080 to 720 x 576. Consequently I was not happy with it as I want to retain the Widescreen aspect.

I then tried a conversion to MPG using a custom setting of MPEG1, Auto bitrate, auto FPS, and a resolution of 1920 x 1080 - HD 1080. This resulted in a jerky playback in Windows Media Player - still not happy. :(

Then tried a conversion to MPG using a custom setting of MPEG2, Auto bitrate, auto FPS, and a resolution of 1920 x 1080 - HD 1080. This resulted in a very bad pixellating playback in Windows Media Player - consequently still not happy. :(

Any suggestions, as I would like to retain the original format and clarity? Thanks in advance for any suggestions.
Ian Bell
 
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Location: Melbourne, Victoria, Australia

Re: Optimum settings for authoring

Postby Vapymid » Thu Jan 27, 2011 1:26 pm

Well, first you need to find out what is the MP4's frame-rate.

If it's 25 or 12.5 fps you will convert it to PAL, if it's anything else - (15, 23.976, 24, 29.97, 30 or multiples of it), you will need to convert to NTSC.

PAL widescreen will be 720x576, NTSC widescreen - 720x480. Note that the resolution for 4:3 video would be the same - the aspect ratio of the end-result will be determined by the encoder setting the widescreen flag in the output file. However, the video editor/converter which will feed the frames into the encoder must recognize that the source aspect is 16:9 (otherwise it may try to crop/pad the picture).

If you use EditStudio6 (I don't know if ES5 will read MP4 files) you need to install Quicktime and then ES6 should be able to load the MP4 without conversion.

Set the project properties to 16:9 and encode to MPEG2 as usual except if the MP4 is 23.something or 24fps. In the latter case you need to set both the project properties and the video encoding parameters to "MPEG2 NTSC frame-rate" @23.976fps. When the encoding is done and you import the file into DVDLab it will show up an error and will offer to do a "pulldown", which you should accept.

Regards
Vapymid
 
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