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Topic: foo_truepeak True Peak Scanner (Read 57994 times) previous topic - next topic - Topic derived from Re: Resampling Hi-Res...
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Re: foo_truepeak True Peak Scanner

Reply #250 –
I don't have an estimate, I need to find the time. The biggest obstacle is that people want TPS to also handle HDCD, but I don't want to add any special decoders to this component. Which means I first need to finalize HDCD component so the two can interact properly.

Re: foo_truepeak True Peak Scanner

Reply #251 –
Ah that's fine, I just thought you have forgotten about it.

Re: foo_truepeak True Peak Scanner

Reply #252 –
Truepeak Scanner Beta with Bitspersample detection.

For some mysterious reason, since a while the scanner now always returns 24 bps on my FLACs. In a test case, I made them 20,18,16 - I can clearly see the differences in file sizes and bitrates. But plugin measures 24. It worked perfectly a while ago. With mda dither and the noise shaping algo.

The only thing that changed is that I now create FLAC 1.5, maybe that's the reason?

Re: foo_truepeak True Peak Scanner

Reply #253 –
Newer FLAC can't be a problem, it is a lossless compressor after all. But it sounds like something goes wrong with your file creation though as the scanner does not invent data that isn't there.

Are you certain there is no additional processing going on after bitdepth reduction? Note that the dither DSPs don't do clipping. If I interpreted your post on Flex DSP correctly, you do resampling, bitdepth reduction and then advanced limiter. You should do the bitdepth reduction and dithering as the last step.

PS: If you have Adobe Audition you could use its Amplitude Statistics tool to get another opinion about actual bitdepth. For FLAC you could also use the commands or scripts from this old thread: https://hydrogenaud.io/index.php/topic,97746.0.html.
Though the FLAC's wasted_bits doesn't seem to be entirely reliable tool for this. I just tested with a 20 bit file that is reported as 20 bits both by TPS and Adobe Audition and a single FLAC frame reports wasted_bits=3, causing the fbits script to think the file is 21 bit track.
 

Re: foo_truepeak True Peak Scanner

Reply #254 –
Quote from: Case on
Are you certain there is no additional processing going on after bitdepth reduction? Note that the dither DSPs don't do clipping. If I interpreted your post on Flex DSP correctly, you do resampling, bitdepth reduction and then advanced limiter. You should do the bitdepth reduction and dithering as the last step.
Perfect, that's the cause and change I forgot about, I have put Advanced Limiter last. Thank you!
Nah, no Audition here, Ocenaudio for Wave edit and Reaper as a DAW. Ocen has good stats, but no bitdepth info.