Support and General Use > Audio Playback, Database and Playlists
Support for 24 bit / 192 Khz FLAC?
Kitlope:
I have been ripping some DVD Audio discs of mine to 24 / 96 and 24 / 192. I can play the 24 / 96 on my Rockboxed iRiver iHP-120 but the 24 / 192 just skips through the songs real quick with no audio.
Just wondering if its supported or if I need to downsample to 24 / 96.
Thanks
Kit
Llorean:
You should actually downsample all of it to 16/44. Rockbox is going to play them back at that anyway, and your resampler is going to be better than the built in one.
Kitlope:
ahhh yes I remember that now. Ok thanks.
Packgrog:
I've been rummaging around in the forums trying to find more concrete info on this, but is there any reason why 16/44 is always set as the hard limit? I've seen it written that everything is upscaled to 32-bit before being run through all of the various effects, then downscaled (and dithered if enabled) to redbook. Why is 16/48 not even an option? Don't most of the targets support that (iPods certainly do)? I know that's the upper limit for any MP3 files I've encoded in the past (I stick with FLAC nowadays).
Is it simply a matter of too much effort required to determine the maximum possible output of each build target that prevents higher bit depth and sampling rates? Sure, the DAC in the iRiver H1xx has some lower limits than desired, but if using spdif exclusively (like most people still using the H1xx at this point, I would assume), why not just pass it through?
Also, is there no means for bit-exact throughput? If you're always upscaling everything that gets played to 32-bit and downscaling it back to 16-bit, even if the source files are already at 16/44, there's not really any benefit in doing the dithered transcode from 24/96 to 16/44 before loading an album onto the player. No matter what, you're still stuck with whatever algorithms Rockbox uses for dithering and downsampling, so you may as well still use the highest supportable resolution (24/96 at the moment).
Sorry if this is rambling. Too many interruptions. One way or another, the player sounds better with my external DAC (iBasso D1 with upgraded opamps to a Denon AH-D2000 with JMoney pads) than any other source I have available at the moment. I'm not trying to troll or make demands or anything, I just wish I could squeeze that last drop of quality out of the best source I own. :)
saratoga:
--- Quote from: Packgrog on June 16, 2010, 01:16:06 PM --- Why is 16/48 not even an option? Don't most of the targets support that (iPods certainly do)?
--- End quote ---
Because the DSP system only works at 44.1khz. You can playback files at other sample rates on most targets, but not through the playback system (only plugins) since the sample rate would be wrong for all the effects and filters.
--- Quote from: Packgrog on June 16, 2010, 01:16:06 PM ---Also, is there no means for bit-exact throughput?
--- End quote ---
I think the one rockbox player with digital out can. Obviously no other device can do it.
--- Quote from: Packgrog on June 16, 2010, 01:16:06 PM --- If you're always upscaling everything that gets played to 32-bit and downscaling it back to 16-bit, even if the source files are already at 16/44, there's not really any benefit in doing the dithered transcode from 24/96 to 16/44 before loading an album onto the player. No matter what, you're still stuck with whatever algorithms Rockbox uses for dithering and downsampling, so you may as well still use the highest supportable resolution (24/96 at the moment).
--- End quote ---
I think you're confusing resampling (which means changing the sample rate) with changing the bit depth (which means converting from 32 bit to 16 bit in the case of rockbox's audio drivers. Rockbox's decoders all operate at 32 bit precision (because we run on 32 bit CPUs), but they do not automatically convert sample rate unless the source is not already 44.1khz.
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