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8th April 2021, 02:16 | #2 | Link |
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Lossy compressed audio has no bitdepth anymore.
One can read 32bit float reported but that gives no safe way to conclude any source resolution. The reported values can depend on the decoders, their implementations, and possibly embedded metadata.
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8th April 2021, 02:30 | #3 | Link |
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Hello,
thank you for the reply but i have compressed lossy audio in DTS which has 24 bit, so there should be some easy way to keep it. Audio #2 ID : 3 Format : DTS Format/Info : Digital Theater Systems Codec ID : A_DTS Duration : 1 h 30 min Bit rate mode : Constant Bit rate : 768 kb/s Channel(s) : 6 channels Channel layout : C L R Ls Rs LFE Sampling rate : 48.0 kHz Frame rate : 93.750 FPS (512 SPF) Bit depth : 24 bits Compression mode : Lossy Stream size : 496 MiB (5%) Language : Chinese Default : Yes Forced : No |
8th April 2021, 09:08 | #4 | Link |
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There is no real loss in going down to 16b.
In fact, having 24b and encoding "lossy" was already a bad decision to start with. Keeping proportions it is like having an MP3 off a CD that has been encoded in 24b (I am not sure MP3 allowes 24b, but it's a fictional argument anyway) which then "has to be kept" 24b while re-encoding lossy again into another format.
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8th April 2021, 20:55 | #5 | Link | |
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While lossy audio has no bit-depth, DTS comes in a lossless flavour. In order for it to be truly lossless, there must be a reference bitdepth for decoding, and it appears they chose 24. Before DTS could be lossless, there was DTS 96/24. I assume the same 24 bit principle applies to DolbyTrueHD.
latigular, Most programs would decode to 16 bit for re-encoding losslessly (flac or wave file etc) because the file sizes can get silly at 24 bit. Can you clarify this? Quote:
If the output is lossless you'll have huge files at 24 bit. As a quick comparison I encoded 1 hour and 36 min of 5.1ch audio as flac. Once at 16 bit and again at 24 bit. The 16 bit version was 658 MB. The 24 bit version was 1.7 GB. If the output format is lossy such as AAC.... it has no bitdepth. |
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9th April 2021, 08:22 | #6 | Link | |
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I wish that the MediaInfo developers would remove (or suppress by default) that stupid field from the program's output for lossy DTS. It causes nothing but trouble. |
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9th April 2021, 13:25 | #7 | Link |
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A reliable way to test for an encoding's effective dynamic range is to feed it a very quiet signal, decode with a known good player, then boost both up to audible levels and compare. Lossy encoding (mp3, ac3, dts) will only exceed 16 bits during very quiet sections that are usually inaudible, and usually never in VBR mode, because the bitrate will be automatically decreased as the levels drop below the threshold of hearing. Some encoders will also use less precision to be fast.
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10th April 2021, 16:37 | #8 | Link | |
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10th April 2021, 18:02 | #9 | Link | |
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