Huffyuv + Vdub question =)

[sungey]

what's the difference between Normal Recompress and Fast Recompress ?

If i want to recompress Huffyuv avi (encoded using ConvertToYuy2) into Huffyuv again without applying any filters ... which one should i use ? Normal of Fast Recompress ? Also should i use ConvertToYuy2 when reencoding ? Will there be any quality loss ?

Thanks in advance .. :)

[fisix]

fast recompress is used when you are starting out in YUY color space (as opposed to rgb) and your output is in YUY. the fast part is referring to NOT having to convert to rgb and then back to yuy for the output. the only reason why you would convert to rgb is to use virdub's filters (all written assuming rgb in). in fact, virdub won't let you fast recompress if you have applied any vdub filters.

so, if you are starting out in yuy, AND you don't want to use any of the filters, then you definitely should use fast recompress. dvd rips start out in yuy, and while avisynth can be used for rgb work, the reason why it is used so extensively is it can do most of the same filtering virdub can do without having to convert to rgb and back (speed baby speed).

also, the type of compression has nothing to do with whether you f-recomp or full proc. just make sure you select huffy as your compression before you try to save the avi, otherwise i think it defaults to uncompressed and the file sizes are huge.

ps you might want to read through some of the guides (all the way through) to get a better handle on things, also the glossary doom9 put together is muy bueno for beginners.

-fisix

[Leuf]

Okay I'm stumped.. Why would you want to reencode a huffyuv file back to huffyuv without doing anything to it? But yes you can use fast recompress for that, it doesn't matter what you have huffyuv set internally for the RGB compression in this situation, since it won't be receiving RGB.

[sungey]

thanks for the explanation ...

the reason why i recompress Huffyuv avi back into Huffyuv avi without filters is because i want to decimate the original Huffyuv using Avisynth .... =)

thanks alot ^^

[fisix]

hmm, you don't have to save the avi after each step. hopefully, before you are saving the avi, you are setting the compression to the final format (divx?) and just processing it all in a go. if you are doing all the processing in one step then the encoding in another, then it's possible you are going to get a slight time decrease if you are doing multipass encoding. but remember you are still spending time recompressing into huffy. 'recompress' does't mean you have to compress back into the same compression format. you can reompress into any compression format. and if you are going to use some other encoder like tmpg, you can frameserve directly into it without having to save the avi after each program is done with its processing.

if you have it all worked out, then just say you're fine and i'll shut up. otherwise maybe you should reply with a discription of what you are starting with and what you want to end up with.. we might be able to save you some steps.

-fisix

[sungey]

Im planning to recompress the lossless avi into Divx using Nandub ...
I use lossless avi so I dun have to spend alot of time reencoding (since Decimate() is quite slow) when something bad happen to the Divx encode ... and now evrything works fine ^^ ... thank you .. :)