Bitrate viewer aided encoding?

[bolix999]

I'm just wondering if there is a quick way of getting near 2 pass VBR encoding. Is there a way of taking the output from a Bitrate Viewer log (scanning your VOBs), scaling down the figures and banging the info into CCE (such as convert the log to a VAF file) or TMPGEnc as the desired bitrates to use during encoding? EG Bitrate Viewer shows min 1200, max 9000 avg 6000 -> scale down to min 400, max 3000 avg 2000. Specific EG: at 1:00:01 the bitrate of the VOB is 4803 so at 1:00:01 in the mpg encode use a bitrate of 1601.

This way the time taken would be just a one pass plus the BV scan (very fast).

Just a thought,

Bolix

[adam]

No it doesnt work like that. Bitrate viewers simply look at the bitrate and the resulting Q value. Some can analyze other aspects of the video as well but nothing like what a multipass mpg encoder does. The first pass of a multipass encode analyzes the actual pictures in your video and determines how the bitrate should be allocated.

The closest thing I can think of to implement your idea is to use 1 pass manual vbr and just go and add or subtract bitrate according to how the source is encoded, as viewed in Bitrate viewer.

[bolix999]

Cheers Adam,

Now I'm not saying you're wrong, I'm just trying to understand this. The bitrate viewer can show you how the bitrate has been allocated in a VOB, so why can't this log be used to determine the bitrate of the encoded mpeg (at lower levels say take log and divide all numbers by 3). Now I realise that the first pass in a VBR must do more than this otherwise it would be a damn sight quicker, but if the bitrate was determined by the bitrate viewer log, then surely you would get half decent encodes - better quality than CBR, more measurable file size than CQ, faster than 2 pass VBR (though probably not quite as good quality).

Bolix