DVD Spec says no more than 9848Kbps combined for all audio/video/subtitle tracks and interleaving data. If you have a PCM audio track, that's 1534Kbps already, leaving a little over 8000Kbps for video, which is where that rule of thumb comes from. Video alone is limited to 9800Kbps (with no audio tracks, of course), with the remaining 48Kbps going to interleaving data.Scintilla wrote:And for those reading this thread who want to know but haven't figured it out:
None: the bitrate is controlled not by the script, but by your TMPGEnc settings themselves. If you're using VBR or ABR, one of the bitrate settings should be "Maximum bitrate" -- make this no higher than 8000 Kbps (this is what I was always told, but apparently according to TsunamiX's DVD Author, you can go as high as 9800 Kbps). If you're using CBR, set the bitrate no higher than 8000 Kbps.TsunamiX wrote:What setting is needed in the avs script before running it through TMPGEnc so that the mpg will come out to a playable bitrate?
My usual method is to pick 2-pass VBR, set the maximum bitrate to (9800 - (audio bitrate, 1534 for PCM, usually 448 for AC3)) and the average bitrate about 1500 below that.