Q: Encoding at CQ (not VBR or CBR)

[jansb000]

I have experimented with both CBR and VBR encoding and I have a general idea of how these work. Yesterday I tried to encode with the setting CQ (Constant Quality). The encodingprocess was so completely different (and probably buggy) that I want to ask here how it should work...

In my case DVS2SVCD started TMPG in the normal way, but TMPG reported an estimated processing time of approximately 8 minutes! (where 8 hours is normal for VBR). Indeed the complete movie was handled in just 8 minutes but then TMPG was started again, again, and again. Ultimately I stopped the process and set DVD2SVCD to the old known VBR that I knew would work.

Is the process that I described here OK or is there a bug somewhere? (Or did I maka a mistake?) In other words: how would a normal CQ encoding process proceed?

I used DVD2SVCD 1.1.0a.

PS: I saw a bug reported about problems with the last image-file generated by D2S 1.1.0.a. Could that be the bug that I experienced?

[Boulder]

I think that D2S did the CQ value prediction at that point to fill the CDs to max capacity.

[ux-3]

I'd like to tune into this question, cause I share the starting position (familiar with CBR and VBR) and recently tried CQ in order to test something quickly, without waiting three times as long. I used CCE and wanted to have an encode within 300 - 3500 with 2100 avrg. Apparently, the program was did set the max bitrate to about 2200, despite me alloting far more in the bitrate tab. Since I figured that I was doing something wrong, I tried to gather more info, but to my surprise found little. The tutorial says that a value of five will fill up a CD pretty well, but little extra info is available. At a value of 50, it used only half a CD, which struck me as odd. Since this thread looks like it might be hit frequently in searches, perhaps someone can supply a link/thread that contains relevant info to controlling the QC cce encoder. Roba is surely not helpfull, since CQ will likely be tried by newbies, who's P3 500 will not allow much else speedwise. And I got so frustrated that I tried my stuff at 2pass - which to me looked much better than CQ.