Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Editing › Questions about bit rates › I can help to answer a few
I can help to answer a few of your questions. As far as bit rates go for dvd, I believe it is a codec thing so… Since you are capturing DV from tape uncompressed it doesn’t have a bitrate. Mpeg2 bitrate however for a dvd does depend on a couple of factors.. first, it depends on how much video you need to fit onto a dvd. It also depends on your audio format. If you use AC3 encoding, you can have a larger video bitrate than if you use uncompressed pcm audio, because the uncompressed audio uses up some of the dvd players available bitrate.
I would agree that you shouldn’t go over 8000 for video bitrate or you could start running into some problems with certain dvd players.
If you are converting analog tapes, it is best to capture them to dv tape and save that as your master since it is the highest quality available as uncompressed.
When your video editor encodes to mpeg2 it has to compress the uncompressed file. To do this most efficiently and effectively there are a couple of considerations you should know about. First you asked about variable bit rate VBR and constant bit rate CBR. VBR scans your video for motion, in areas where there is little motion it can use less bitrate, in areas where there is a lot of motion it must use the highest bitrate available to get the best quality overall. Generally, in most cases it is best to use VBR. Also you must consider using multipass encoding.. It takes twice as long to encode the file, but basically it uses the first pass to scan the video for motion, and the second pass to encode. This assures the highest possible quality when compressing the video.
Hopefully some of that helped.