search for: interchannel

On 1/2/07, Josh Coalson <xflac@yahoo.com> wrote: > I'm not sure I understand... I think the INDEPENDENT you are referring > to means the interchannel decorrelation method. this stage is before > and independent of LPC analysis. Correct. > I'm not sure why "independent" frames would not decode correctly > though. more info on exactly how it is not working would help. Ignoring the fact that I am not doing anything speci...

Hello, I am new to the list, to FLAC and to FLAC development but I am having a problem in trying to make FLAC work with MediaMVP based the mvpmc project (ref. http://www.wvpmc.org) that hopefully someone can help me with. This device is possibly minimum spec. for a FLAC decoder. In any case, I have had some success cross-compiling libFLAC (without the ogg or metadata modules).for the embedded

Hey everyone, I have a few questions about FLAC that aren't answered in the FAQ or the documentation. Maybe someone knows about these details. 1. What exactly is meant by "reference encoder"? 2. Concerning interchannel decorrelation, what is the point of creating separate signals, why not just keep the channels you have? For example, you might create "mid" and "side" channels, but you still end up with 2 so what's the point? The only reason I can think of is maybe a couple of bits are sa...

Hi Opus list. I subscribed because your discussion on the IETF draft ("Ambisonics in an Ogg Opus Container") was mentioned on the sursound list. I tried Opus for ambisonics more than a year ago. It does works with uncoupled channels (I had to patch the encoder). I don't know what else could be done to optimize support for ambisonics, as I'm not a codec expert. So I think that

...ty for > interleaving multiple channels, though I'm not sure whether FLAC > operates on > each channel individually (does it?). > In FLAC the framing and synchronization is not done at the individual channel level. If such is done in Ogg I'm not sure how they take advantage of interchannel correlation unless maybe a stereo channel is treated as one 'super- channel'. In this case, a FLAC stream could, like you said, be treated as one super-channel and encapsulated. FLAC's framing overhead is pretty small, usually 6-10 bytes per frame. Josh ____________________________...

...ible to build a local copy supporting more > channels by simply increasing FLAC__MAX_CHANNELS in > include/FLAC/format.h? > > Either of these would greatly help in reducing the storage > requirements for recording sessions. the channel grouping is mainly to take advantage of interchannel correlations. see also the FAQ: http://flac.sourceforge.net/faq.html#general__channels you could hack the code to make non-standard FLAC with more channels but you will also have to change how the number is stored in the frame header. Josh __________________________________ Do you Yahoo!...

...floating point on this device) > which would explain how to transform the INDEPENDENT sample frames > to LPC. Obviously preserving lossless is important for this logic too. > > Thanks in advance. I'm not sure I understand... I think the INDEPENDENT you are referring to means the interchannel decorrelation method. this stage is before and independent of LPC analysis. for stereo data, the encoder chooses whether to encoder the L R channels as is, or to compute mid (M) and side (S) channels and send M/S L/S or R/S. after that, each of the 2 channels can be encoded with LPC or other met...

--- MVallevand <mvallevand@gmail.com> wrote: > On 1/2/07, Josh Coalson <xflac@yahoo.com> wrote: > > I'm not sure I understand... I think the INDEPENDENT you are > referring > > to means the interchannel decorrelation method. this stage is > before > > and independent of LPC analysis. > > Correct. > > > I'm not sure why "independent" frames would not decode correctly > > though. more info on exactly how it is not working would help. > > Ignorin...

when i encode i multi channel file, does flac encode every channel seperatly or does is look for similarities between channels? the documentation says: INTER-CHANNEL DECORRELATION In the case of stereo input, once the data is blocked it is optionally passed through an inter-channel decorrelation stage. The left and right channels are converted to center and side channels through the following

...patch the encoder). I don't know what else > could be done to optimize support for ambisonics, as I'm not a codec > expert. I agree. We are decoupling channels and setting the bitrate allocation to give progressively fewer bits to higher order channels. We have also explored dynamic interchannel bitrate allocations based on a worst case analysis (over all head rotations) of rendered binaural masking levels. We did not find dynamic allocations to improve subjective quality enough to explore that potential encoder optimization in depth. > The allowed number of channels should not be rest...

...the reference encoder, then it means your decoder is broken. However, there are now other encoders besides the FLAC reference encoder, and if you can't decode those, then it's not clear which one is wrong. I'm not sure that I answered your question, though. > 2. Concerning interchannel decorrelation, what is the point of > creating separate signals, why not just keep the channels you > have? For example, you might create "mid" and "side" channels, but > you still end up with 2 so what's the point? The only reason I can > think of is m...

Hi folks, I'm doing a merge of my current branch onto the mainline (for testing) today. I believe it to be stable. Just a little more vorbisfile testing. After the merge, I have a few more patches to apply, then onto cascading/coupling. New stuff: Floor backend 1 and residue backend 1; both are present, but the mainline modes won't use either yet. Naturally, both are enabled for

...;t know what > > else could be done to optimize support for ambisonics, as I'm not a > > codec expert. > > I agree. We are decoupling channels and setting the bitrate > allocation to give progressively fewer bits to higher order channels. > We have also explored dynamic interchannel bitrate allocations based > on a worst case analysis (over all head rotations) of rendered > binaural masking levels. We did not find dynamic allocations to > improve subjective quality enough to explore that potential encoder > optimization in depth. So, channels will stay uncoupled f...