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13th January 2015, 09:20 | #1 | Link | |
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SACD - gapless playback
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13th January 2015, 10:17 | #2 | Link |
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It's actually not too difficult to create your own .cue files
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13th January 2015, 10:28 | #4 | Link | |
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Gapless discs, if compressed, will always be problematic to "rejoin", because of the buffer size differences (read padding) on both coding and decoding steps. Yes, I know that DSD to PCM are lossy, however I am confident that the losses are not that great, in particular with titles that are available only as SACD (and are, according to Sony, processed in PCM then converted to DSD). On the other hand, HiRes FLACs or WAVs can be played on most of my players.
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13th January 2015, 10:36 | #5 | Link |
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So you want to take individual tracks from different SACD/DSD sources and join them all together into one long track. And create a cue file that allows you to navigate to each individual track?
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13th January 2015, 10:58 | #6 | Link | ||
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13th January 2015, 16:06 | #8 | Link | |
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Indeed, I 'pre-ordered' some new SACD disc releases yesterday
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Last edited by SeeMoreDigital; 13th January 2015 at 21:42. |
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13th January 2015, 19:22 | #9 | Link | |
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Are you sure gapless discs are problematic with the method I gave ? |
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13th January 2015, 20:17 | #10 | Link | ||
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But not exactly I want to have a huge file that should have cue points or indexes. I don't want to join files for the reason I already gave and is repeated below. Quote:
So while not technically an issue of the format, it still is related to the compression algorithm, and since a compression algorithm is related to a format (like MPEG to .MPG, MPEG1 layer 3 to .MP3 etc etc). I might be worring too much, since I don't know the frame sizes for FLAC nor the indexing system of the SACD. I hope it's clear now. If it's not possible, then it's Ok. Thanks for input.
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13th January 2015, 21:06 | #11 | Link |
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Ghitulescu,
As far as I'm aware Foobar offers a few DSD tools that might be able to help you. Not that I use it myself... Sufficed to say, if you're project is related to any other audio formats types, then it's outside the scope of this topic. Cheers
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13th January 2015, 21:23 | #12 | Link | |
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But perhaps my impression of gapless playback is different than Yours. Sample padding/aligning seem to be less important. |
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13th January 2015, 21:27 | #13 | Link | |
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Concept of 1 bit delta sigma stream with strong noiseshaper sounds odd but lot of people believe that this format is superior to DVD Audio... |
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13th January 2015, 22:08 | #14 | Link | |
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The player should work like Nero Burning Rom(e), using a buffer, and concatenate the files seamlessly. Padding is very important.
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14th January 2015, 10:11 | #15 | Link |
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In random mode you need to have capability to decode 2 streams and to perform fading between them - padding may help but real gapless playback assume that concatenation points (splices) overlap (at least partially). Buffering may work but can't provide random access and latency is unavoidable...
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14th January 2015, 12:06 | #16 | Link | |
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I'm not sure to understand what you mean ; is there a way (something to do at the authoring step or when burning the Sacd) to avoid the "pop" (or "glitch") sound that we hear between some tracks on some Sacd players ?
I have 3 Sacd players and the only one that does not have this problem is the Oppo. I found this explanation on Oppo's website concerning a firmware ; Quote:
And I'm astonished you talk about Nero Burning Rom because I believed it was not Sacd compatible, Imgburn or UltraIso are generally used. |
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14th January 2015, 14:39 | #17 | Link | |
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Since DSD is a stream of bits, and SACD/DSD does not allot a fixed number of bits/bytes (it depends on the music) ie VBR, but the SACD sector is 2048 bytes, I am not sure how the track boundaries are set (they should be at sector boundaries - but this does not correspond to a fixed/foreseable place in the stream). On the other hand, PCM has a fixed bitrate (CBR) and it's easier to "scrub"/cue to a position, knowing any of size and time. I was not talking about SACD in relationship with Nero, just mentioning Nero for its ability to create gapless tracks from separate files. I never used ImgBurn for audio.
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14th January 2015, 14:46 | #18 | Link | |
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I don't want padding. I only explained why I don't want padding. Gapless playback does not require two streams. It simply requires that once a stream ends, the next one should be in line to be processed. No player I know avoids a buffer - therefore indeed the content of two separate streams coexist temporarily, but the files themselves should have been processed one at a time. This is how all hardware players (should) work. CD players work this way, if pure audio players (not MP3 players with computer drives) Now, if the tracks/files are gapless, but the player pauses each time it loads the next one, this is IMHO due to two main causes 1. track boundaries (VBR) do not match sector boundaries - this way the player disregards the padded real bits and starts with the next track (which should have included the discharged bits) 2. track boundaries match sector boundaries but the player is programmed to read the tracks sequentially as tracks, and not to process the stream as a stream (ie ignoring indexes and stuff - but updating the information on display like TRACK 03 TIME 15:45.73) I think the first case is the most common case.
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14th January 2015, 15:07 | #19 | Link | |
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Yes, I know two (yes, only two) movies whose reels are designed to be played in a random order and still tell a coherent story. But these movies are the exception.
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15th January 2015, 12:48 | #20 | Link | |
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How to know if they match before exporting, burning, and listening Sacd ? I'd like to avoid conversion in PCM, otherwise remake a Sacd would be a nonsense (after conversion, I would let PCM in PCM and make a dvd-audio). And I wonder how did Oppo to remove these "pop" sounds, because I guess that if it can be done in real time by a standalone player, it can be done with some audio tools on a pc, but I may be wrong. Last edited by Music Fan; 15th January 2015 at 12:51. |
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