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Originally Posted by shovon With regards to choosing the best bit rates when transferring footage to DVD, has anybody got any links to simple online tutorials that might explain this.
Also, online tutorials for using Adobe Premiere pro/elements and Adobe Encore 1.5 would be much appreciated.
Thanks in advance. |
The maximum bitrate is 9.8 Mbps for DVD
You want to use as high a bitrate as you can, but sometimes going to the max can cause problems itself, as some players may choke on the high bitrate as you are right at the limits of performance. (Hollywood DVDs average bitrate is nowhere near max.)
To work out what bitrate you can encode at for a 4.7Gb disc (DVD-5) it is a simple matter of adding up how many minutes of footage you have to go on the disc (if you are adding motion menus add the minutes for them as well).
Then do 600/number of minutes. (For a dual layer 8.5Gb disc (DVD-9) it's 1088/number of minutes)
That will give you the average bitrate you can use for your disc.
i.e.
600/90 minutes = 6.6Mbps
That 6.6Mbps must include the video & audio tracks, so make sure you know when you are encoding exactly what bitrate both the video & audio are being encoded at & if you have more than one audio track (i.e. a AC3 5.1 option & an AC3 2.0 option on the same disc) that you count both of them. (Dolby 5.1 is typically 448kbs , Dolby stereo 192kbs)
That 6.6Mbps is what the "average" maximum bitrate can be. If you use "VBR" (Variable bitrate encode) you can set the average to 6.6Mbps & the encoder will use more than that in complex scenes with high movement & a lower rate in less complex scenes to best utilise the space on the disc.
With "CBR" it will use a constant rate irresepective of how complex the scene is & the space will not be best utilised. However if you say only wanted to fit 45 mins on a 4.7Gb disc (600/45 = 13.3) you couldn't do a 13.3Mbps bitrate to DVD spec so you could encode at say 9.5Mbps CBR (as you can use the maximum rate available because saving space with a VBR encode is not required.)
Generally CBR encoding is quicker than VBR, as with VBR the most efficient encodes require several passes of the file to estimate most effecient bitrate management.
As far as online guides go, they will be very dependent on what parameters are adjustable in your particular encoder.
Here is one that explains TMPGEnc pretty well though.
http://dvd-hq.info/Compression.html
I have a little bitrate utility that when you enter the disc size & the minutes of video etc, it tells you what the optimum average bitrate is for your project.
If you want a copy PM me.