I have several DVDs of home videos which were transferred from a VHS recorder to a standalone DVD recorder, with over 2 hrs of video on them (strangely whoever did the recs copied them onto what appears to be have been DVD media that I thought could only be used on a PC using a DVD writer drive as the discs appear to be designed only for above 1x speed, no idea how that was done. But anyway, the video quality is terrible as you can see every pixel.The bitrate is dependant on the length of video. Unlike music CD, DVD do not use fixed bitrate and its pretty easy to work out.
Say your DVD holds 4.5GB and you have 2 hours of video.
4.5GB = 36,846 Mbits
Divide by number of seconds of video = 5,11 Mbits per second.
If you double the length of video then you have halve the bitrate, etc
Commercial DVD that you buy are usually between 3 and 9 MBits / sec
My VHS to DVD recorder can do 8 hours of VHS (long play 4 hour tape) onto a single sided DVD-R with no noticeable loss in quality, that is around 1.28 MBit/sec and I'm sure it would even manage 10 hour (5 hour tape in LP).
I have just done another attempt at converting a 2 hr 33 min video in Handbrake to get the video to fit to a standard DVD. I set to to MP4 and lowered the quality right down to 30 (according to Handbrake is the lowest quality setting). After the conversion I played the video and it looked like VCD quality in MPEG-1, which I suppose is expected (the size read 246MB). But when I dropped the video into Nero Video the video still exceeded past 4GB to 5GB. How the hell can a video be compressed so much yet still not fit to a DVD?. I understand that Nero reencodes the video, but how much compression does this file need to fit?. I can rip a 8GB movie to a 4GB DVD and the quality won't be that bad. I suspect whatever the file size is on this particular video it must be enormous, or the version of Nero I have is the problem.