![]() Simplest method is to use a bitrate calculator, find the bitrate at various lengths, then encode a 5 minute segment as these bitrates and see what it looks like. But at least it is an informed decision and you haven't wasted hours to find it isn't watchable. If these are screen based tutorials, you need to keep the resolution at full-D1 to preserve the detail, and keep the bitrate reasonably high to ensure you can still read everything. ![]() ![]() However the three are intrinsically and inseparably linked. So yes, time is not the factor, size is and bitrate are. Personally, I believe four and a half hours is too much for a DVD unless you are willing to go to half-D1 resolution, and if you do that, you will find that the resolution is too low for the details required. If the bitrate is too low, then either encode and burn to a DVD9, or split the files into two discs. If you need to fit into a DVD5, then encode for a DVD5. And never encode for DVD9 and transcode for DVD5. So never encode for DVD9 if you need DVD5. The more you encode with a lossy codec, the more damage you do. Therefore, the longer the running time, the lower the bitrate, and consequently, the lower the quality. Up to a point - 90 - 120 minutes, the difference is tolerable. The lower the bitrate, the lower the quality. Quality is derived from the quality of the surce, the quality of the encode, and the bitrate allocated.
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