Originally posted by RD Hey everybody,I know we have some mpeg audio experts out there so I am curious to see if my answers to these questions are correct.Please tell me if my guesses are wrong...1. Because .mp2 is a subband encoder (and not a transformation encoder) encoding higher frequency content puts more strain on cbr encoding (e.g., 224 kbps). In fact, as you increase from 16 Khz to 17, 18, 19 and 20 Khz the strain increases exponentially.So question 1:I have a .wav file that goes up to 20 Khz, and have to encode it in mpeg 1 layer II (.mp2) at cbr 224 stereo. CRC needs to be on for SVCD so the effective bitrate is 208 kbps... WHAT lowpass value should I use to minimize strain on the encoder (Qdesign mpeg acm codec) and minimize artifacts?Is 18Khz the best bang for the buck? 19Khz?Its a movie soundtrack by the way, not music...Question 2:The .wav file I want to encode is already encoded in Dolby Surround sound, If I perform an 18 Khz lowass in Cool Edit 2000 will this destroy or damage the surround sound information?My guess is that it will not destroy the surround sound info...Question 3:What type of lowpass should I use in Cool edit 2000?Hanning window, Hamming? Blackman?My guess is that Hanning is the best for my movie soundtrack...Thanks
Originally posted by RD the encoder (Qdesign mpeg acm codec)
Originally posted by AgentMil it looks like I choose the right encoder for my VCDs encodes
Originally posted by RD rjamorimWhich .wav files should I test to see that toolame is superior to qdesign?
In my limited tests qdesign sounds very good for movie soundtracks, and it encodes the WHOLE bandwith 20-20Khz.Toolame with psymodel 2 never goes above 16Khz....Toolame with psymodel 1, which Frank and Ivan say is not as good as psymodel 2, does occaisionally go above 16Khz.Since exploding glass and other things sound nice above 16Khz,qdesign seems very attractive.The only thing I am afraid of is that 224 kbps in qdesign mp2 cannot handle full bandwith without some artifacts, henc I am trying to decide on when to lowpass it.... no one has told me if this point is correct yet :
Btw, rjamorim, qdesign did get some praise:QDesign's MPEG Layer 2 gets a critical assessment and is compared with other codecs, in a two part series "Lossy Compression" in the May and June 2000 editions of the "Hi-Fi" Magazine."Codec B (MPEG Layer 2)...better on vocals and speech, providing more expressive vocals and more realistic ambience and reverb." "Codec B (MPEG Layer 2)...among the best again, sounding more expressive musically.I know this may not mean much, but...
Qdesign Imedia 2 has the most natural and open soundof them all and compared best with the wav file, but all theothers were quite good also. I cant rate the individual encodersand even choosing a "winner" wasnt too easy.
Originally posted by RD Nik: How noticable would the "ringing and transient smearing" be if I used blackman windowing? Is it very subtle?
Originally posted by rjamorim Which MPEG1 encoder do you use?I personally prefer Panasonic (Slightly better than Tsunami, IMO)Regards;Roberto.
Originally posted by AgentMil Yah, I sometimes use (way too complex encoder, I have no time to learn about it) the Standalone Panasonic Encoder to encode, I am learning how to multiplex the audio and video stream, cause I wanna use toolame for the audio stream.
rjamorim, what settings do you use on the Panasonic encoder, for fast motion sections on a movie? If you teach which settings you use for encoding fast motion sections and if they encode reasonably fast, I would be very greatful!CheersAgentMil
Originally posted by 2Bdecided To those testing the quality of Q-design MPEG - you have found the speed/quality switch, haven't you?
Originally posted by AgentMil Thanks rjamorim!!!
You are a great help! Ok it seems the Panasonic Encoder is the way to go then. It just that I got a program that does all the above in one step and in a point and click format But it seems doing it the way you have said doesn't sound too hard and hopefully provide better quality!
What do you mean not configurable? I was reading that the Panasonic Encoder was configurable to the extent of choosing how the images look on the screen and how the encoder post processed them? Do you have another version? Yours sounds much easier to learn, I think I have version 2.5.
Originally posted by 2Bdecided At the risk of teaching my grandmother to suck eggs...To those testing the quality of Q-design MPEG - you have found the speed/quality switch, haven't you?Cheers,David.
Originally posted by RD Um.... I have the 79 dollar acm mpeg layer ii codec and there are no speed / quality switch modes...
Originally posted by rjamorim BTW: The guru's name is Kirsten Madsen
Originally posted by YouriP That's from km's website... There should be enough people around here knowing you shouldn't believe a thing it says on that website. It was meant for TAC promotion (a proprietary codec, now discontinued).