-
4700 kbps bitrate good enough?
After some calculations and bit budgeting, I’ve come up with 4700 kbps for my main video to fit on a 4.7GB DVD. This main video is about 2 hours of on-stage performance dancing in an auditorium. I know source footage quality matters very much in determining how the compressed MPEG-2 will look.
So here are the details: I shot the video with a Sony PD-150 with pretty good lighting, and I didn’t use video gain at all, so not really grainy.(good!) The performances are sometimes zoomed in, other times zoomed out. The motion of the dances are medium paced, but sometimes fast paced.
I’m wondering if 4700 kbps is too low to avoid any artifacts and “blockiness” in this type of video.
Thanks.
-
2 Replies
-
If you encode using a VBR (Variable Bit Rate) setting, with an average bit rate of 4700Kb/s and a maximum bit rate of 7000Kb/s the quality of the MPEG-2 video will probably be okay.
With VBR the average setting determines the filesize (as you calculated), but the encoder uses less bits per second where possible and more bits where needed. The 7000Kb/s maximum recommendation is for a DVD-R or DVD+R. Should your project end up as replicated/pressed DVDs, you could raise the maximum to 9000Kb/s.
(All rates assuming that you will let Encore convert the audio to Dolby Digital at 192 or 224Kb/s.)
-
I had already accounted for audio as well as motion menus and other audio tracks. I had a lot of those, so that’s why I ended up with only 4700 kbps available for the video part only. By the way, you said Dolby Stereo 192 for audio. I actually planned to use Dolby Stereo 128 kbps for my stereo track, and Dolby Mono 80 kbps for my commentary track. Is 128kbps good enough for stereo, and 80kbps good enough for mono speech?
Reply to this Discussion! Login or Sign Up