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laserbite34
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Post subject: Re: Preserving LD AC3 and DTS Soundtrack Posted: 13 Apr 2016, 20:33 |
Confirmed Padawan |
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Joined: 10 Oct 2006, 17:10 Posts: 3742 Location: United Kingdom Has thanked: 5 times Been thanked: 4 times
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sdraper wrote: Technically I can't tell you for sure other than I'd like to do similar things myself. Ac3 is able to be captured but currently no one knows how to capture the encoded dts LD stream. Goldeneye has heavier LFE on the ac3 and prologic matrix track and the first DVD which uses the LD 5.1. This was either corrected or simply not present on the DTS LD. Wouldn't it have to be captured in real time from the bit stream of the LD or maybe use an outboard encoder and use record in real time from analouge 6ch outputs and store on the harddrive of the pc and sync it up later on with video picture and encode it, burn it all into dts onto DVD RW or recordable bluray. So the Dolby AC-3 has a higher LFE.1 level over the dts. Gosh always thought the LFE.1 on my dts pressing was stellar dynamic! Don't own it on any other format as its a film I only watch now and than.
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lion_thongchat
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Post subject: Re: Preserving LD AC3 and DTS Soundtrack Posted: 14 Apr 2016, 09:40 |
Shows curiousity |
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Joined: 11 Aug 2015, 19:50 Posts: 20 Location: Thailand Has thanked: 0 time Been thanked: 0 time
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sdraper wrote: Goldeneye has heavier LFE on the ac3 and prologic matrix track and the first DVD which uses the LD 5.1. This was either corrected or simply not present on the DTS LD. So what the main difference between LD 5.1, LD DTS and Special Edition DVD?
_________________ My Player: DVL-909 (Current), CLD-D606, CLD-S270 Gear: Yamaha APD-1 (AC3RF-DeMo), VSX-329K (Receiver)
Lion ライオン (LD Thailand)
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little-endian
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Post subject: Re: Preserving LD AC3 and DTS Soundtrack Posted: 01 May 2016, 06:47 |
Shows curiousity |
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Joined: 25 Jun 2015, 01:53 Posts: 29 Has thanked: 1 time Been thanked: 1 time
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sdraper wrote: Technically I can't tell you for sure other than I'd like to do similar things myself. Well "technically" all you need is a sound card or onboard sound able to record from S/PDIF sources at 44.1/48 kHz and 16-Bit without screwing things up by performing resampling or other nonsense. Same goes for operating systems and audio editors. The chain is long and apparently there seems to be a latent desire of stupid programmers to mangle around with the bitstream all the time. From a technical standpoint, the approach of recording PCM via S/PDIF and storing it in a file, should be well considered to be trivial. After all, it's 2016 already. Personally, after a lot of frustration, I eventually had success with a cheap though internal (!) Terratec Aureon 5.1 PCI soundcard (around 15€ in Germany) with the CMI8738-Chipset, using "d0gbert's" custom drivers and Goldwave (setting "PCM 16 bit" in the options and Core Audio/WASAPI) under Windows 7. sdraper wrote: Ac3 is able to be captured but currently no one knows how to capture the encoded dts LD stream. A bold statement considering that I already recorded several DTS LDs without any issue. Let "no one" state the following then: Technically, you aren't capturing either AC3 or DTS but PCM audio which actually carries the former formats. All the sound card has to do is to receive the 44.1 kHz / 16 Bit PCM (DTS) or 48 kHz / 16 Bit PCM (AC3) and pass it to the driver without alteration. Then it's up to the user to retrieve the pure AC3 or DTS stream by using tools like bsconvert (part of ac3 filter tools) or dtsconvert, stripping the unnecessary stuff data.
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schorman
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Post subject: Re: Preserving LD AC3 and DTS Soundtrack Posted: 24 Jan 2017, 03:02 |
Third post and above |
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Joined: 06 Feb 2011, 05:47 Posts: 5 Location: United States Has thanked: 0 time Been thanked: 0 time
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sdraper wrote: Ac3 is able to be captured but currently no one knows how to capture the encoded dts LD stream.
DTS capture is definitely possible. See: http://originaltrilogy.com/topic/SUCCES ... e/id/15988 The truth is that editing AC3 or DTS captures to match them with other video formats is the more difficult part of the process, as it is not trivial to do without transcoding. It is doable, but very tedious, as both formats are frame based and can only be cut at frame boundaries. This limits the accuracy of any synced audio to half the frame length of the format at worst. Add to that that the LD DTS format cannot be decoded by software DTS decoders without altering the frame headers of each and every frame, and it makes true, bit-identical LD DTS tracks a rarity in fan edit/preservation/restoration community. When editing, small sections of audio may need to be re-encoded at the edit points, but the vast majority of the audio will remain bit identical to the LD. However, one must be careful that all re-encoded portions of audio are encoded using the exact same settings as the original LD track. I have completed a preservation of the Jurassic Park LD DTS track, which is with the exception of a few milliseconds, bit identical to the LD and is synced to the current Blu Ray. I also plan to work on The Lost World as well.
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laserdisc.ws
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Post subject: Re: Preserving LD AC3 and DTS Soundtrack Posted: 05 Feb 2017, 02:35 |
Serious fan |
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Joined: 05 Mar 2012, 03:43 Posts: 178 Location: Italy Has thanked: 16 times Been thanked: 10 times
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First of all, a so-called bit-perfect capture card is needed to capture AC3 and DTS, and is highly reccomended to capture PCM as well.
AC3 could be used "as is", untouched, for DVD/BD/AVCHD project (if the video is in sync, of course), while PCM and DTS should be converted to 48KHz if used for such projects, or left untouched if used in a file format like MKV. MP4 and so on.
_________________ FanRes - restoring wrong movies, one title at the time! blog.spoRv.com - a blog about video restoration…
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admin
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Post subject: Re: Preserving LD AC3 and DTS Soundtrack Posted: 24 Feb 2017, 03:24 |
Site Admin |
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Joined: 07 Aug 2002, 23:37 Posts: 4551 Location: Tokyo Has thanked: 295 times Been thanked: 1147 times
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nems wrote: Since I use a laptop only (and therefore unable to add an internal soundcard), I had to look high and low for an external device capable of sending SPDIF to USB. With my DELL XPS 15 laptop slowly showing that it won't last very much longer (7 years), I was asking myself exactly the same question: how do I output to TOSLINK/Coax from a laptop that has no more optical outputs like mine did. In theory HDMI fixes that problem but my A/V Amp doesn't do HDMI, I need to split outputs: video to Projector and audio to Amp. Mainly I need to be able to output Digital Stereo/DD/DTS from my laptop. If this can ALSO acquire digital signal from an external source, or even record AC3 or DTS from LDs, then it's even better. Just ordered this little baby to give it a try! If successful, then my laptop upgrade will get easier. Julien
_________________ HARDWARE DATABASE HLD-X0/9 LD-S9 OPPO 105/205 SL-1200G LDD-1 MSC-4000 R2144 PONTUS II C45 MC257
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admin
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Post subject: Re: Preserving LD AC3 and DTS Soundtrack Posted: 02 Mar 2017, 13:48 |
Site Admin |
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Joined: 07 Aug 2002, 23:37 Posts: 4551 Location: Tokyo Has thanked: 295 times Been thanked: 1147 times
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admin wrote: Just ordered this little baby to give it a try! If successful, then my laptop upgrade will get easier. Just received today and it's quite plug'n'play (no need to install drivers). However, I can get it to output stereo over the SPDIF/Toslink but, and that's was my primary reason to buy it, I can't make it output AC3 or DTS over SPDIF in VLC. Back to my laptop internal digital out => DTS 6.1 is back. What am I doing wrong !?! Is the box reformatting everything to stereo bitstream? Julien
_________________ HARDWARE DATABASE HLD-X0/9 LD-S9 OPPO 105/205 SL-1200G LDD-1 MSC-4000 R2144 PONTUS II C45 MC257
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admin
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Post subject: Re: Preserving LD AC3 and DTS Soundtrack Posted: 06 Mar 2017, 18:58 |
Site Admin |
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Joined: 07 Aug 2002, 23:37 Posts: 4551 Location: Tokyo Has thanked: 295 times Been thanked: 1147 times
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signofzeta wrote: It seems like a nice product. I love the case. There are hundreds of USB things that do this though, I have to say. If you have a list of candidates, I'm interested I will have to send back the UX1 and ask for a refund because this baby is just totally unable to pass through AC3 and DTS. It's neat for 44.1-96Khz 16/24bit stereo replay, but it can't handle multichannel 48KHz formats. Since my internal laptop SPDIF already handles 16/24bit for 44.1-192Khz bitrates, as well as AC3/DTS, using the UX1 would be a step backwards and I really need an external USB device to let me upgrade my laptop, loosing the internal SPDIF. I'm back in the market then! Julien
_________________ HARDWARE DATABASE HLD-X0/9 LD-S9 OPPO 105/205 SL-1200G LDD-1 MSC-4000 R2144 PONTUS II C45 MC257
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admin
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Post subject: Re: Preserving LD AC3 and DTS Soundtrack Posted: 09 Mar 2017, 17:56 |
Site Admin |
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Joined: 07 Aug 2002, 23:37 Posts: 4551 Location: Tokyo Has thanked: 295 times Been thanked: 1147 times
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admin wrote: I will have to send back the UX1 and ask for a refund because this baby is just totally unable to pass through AC3 and DTS. I'm back in the market then! Fixed that problem today by realizing that my Radiance 2144 came with a COAX OUT able to split the sound from an HDMI IN and send it back to my A/V Amp. It supports 2ch/DD 5.1/DTS 5.1 (everything you can push on a SPDIF basically) and it's exactly what I was trying to achieve. Case closed. Added bonus: all I need is a HDMI cable from laptop to Radiance instead of my initial plan of having video over HDMI and sound over SPDIF (splitting on the laptop) while it's much more convenient to make the split after the HDMI output. HiFimeDIY was nice and refunded me the UX1+shipping after troubleshooting everything we could together, and finally giving up. Julien
_________________ HARDWARE DATABASE HLD-X0/9 LD-S9 OPPO 105/205 SL-1200G LDD-1 MSC-4000 R2144 PONTUS II C45 MC257
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