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Which tool can mux LPCM in MPEG-2 for DVD-R
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Konran
Junior Member
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18. February 2004 @ 05:59 |
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Hi all,
I'm looking for a program that is able to multiplex Linear PCM audio files (WAV, 2-ch, 16 bit, 48 kHz) and video-only MPEG-2 files into one MPEG system stream without any conversion of audio into MPEG or AC3 format.
TMPGEnc always gives the following message in its MPEG-Tools (Simple multiplex):
"Multiplexing Linear PCM stream to system stream is not supported.", so this one doesn't work. MPEG-VCR converts audio without commenting it into the MPEG format, so this one does also not work. Up to now I didn't find any tool that is capable to keep the PCM format in the resulting MPEG-2 file even if DVD standards say that PCM is one of the obligatory audio format for DVD-R.
Background of my question is that I need best sound quality for some video clips because MPEG audio clips max. out frequency at approx. 15 kHz (even if encoding at 384 kbps) and AC3 has a cutoff between 19 - 20,5 kHz depending on the encoder used (I've tried encoding rates of 192 - 384 kbps).
The following method works but is absolutly uncomfortable: Creating a VOB file with a DVD authoring programm that is capable to mux LPCM audio, then renaming the VOB into MPG.
Does someone know a way much simpler than that or a tool that can mux directly? I appreciate any help.
Regards, Konran
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Staff Member
2 product reviews
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18. February 2004 @ 10:33 |
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I guess I don't understand why you're trying to do this. If you're making a DVD, why do you need to do anything else to it after muxing the audio and video?
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Konran
Junior Member
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18. February 2004 @ 17:18 |
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One aspect of doing that is that I very often cut out commercials from TV sampled MPEG-2. While editing I of course have to cut the audio also. As there is no known MPEG editor that preserves LPCM, I edit the audio stream separately with a wave editor. I store some of the short clips until I've got enough for a whole DVD. So I don't want to keep audio and video files separately I want to remux each pair to store a single MPEG system stream for each clip.
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Staff Member
2 product reviews
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18. February 2004 @ 17:57 |
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Why not just store them as VOBs?
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Konran
Junior Member
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18. February 2004 @ 22:49 |
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Because it's a stupid action of creating a whole DVD project, deleting all the stuff that is not needed only to multiplex two files into one.
I'm just wondering if this should be really possible that most of the MPEG editors and cutters can Demux an MPEG with LPCM in it but none of it can remux the same stuff.
So please, no discussion about why I want it this way or don't go here and there. If there is no tool to mux LPCM, please anybody tell me so ... then I'll make my own tool.
But if there is already such a tool, don't hesitate to tell me. It would save a lot of work. Thanks.
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Staff Member
2 product reviews
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19. February 2004 @ 04:49 |
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I've looked through all the programs I have or could find, and I'm not aware of such a tool. That doesn't surprise me since the only application I can think of for muxing LPCM and MPEG is DVDs, and that's normally not done until the authoring stage. If you either find or make one I'd love to see it. I don't know that I've ever had a need for it, but there's always room on my computer for a tool that may come in handy in the future.
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Konran
Junior Member
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20. February 2004 @ 04:56 |
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That's really surprising me if there is no tool because that is the only way to preserve lossless audio in an MPEG. MPEG audio is pretty bad and AC3 audio not editable ... and AC3 cause dramatic manipulation if converted to PCM and back to AC3 after editing.
I think it will take a while to make a tool by myself. First I keep on my research.
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phuong61
Newbie
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20. February 2004 @ 05:28 |
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try IFOEdit, use create dvd, load your video and wav file in, it might work.
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Staff Member
2 product reviews
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20. February 2004 @ 05:44 |
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I guess I don't find it that surprising. There aren't a lot of people who have any need for lossless audio in their video files unless they're going to be playing them on a CD or DVD player. If the files are staying on a computer most people are looking for more compression vs. higher quality.
I certainly don't disagree that lossless is the best way to go, but when I store my captures to be put on DVD I'm perfectly happy either keeping separate audio and video files until I'm ready to author the DVD or creating VOBs for future use. If I had the right sound card and speakers I can see why it might be useful, but I think most people who are as concerned about quality as you obviously are wouldn't consider it an issue unless they had a serious HTPC.
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Konran
Junior Member
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21. February 2004 @ 10:51 |
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phuong61: Thanks - I've got problems with IFOEdit because it stops processing my input files with "two much frame drops" caused by the bitrate rating which of course can be to high for DVD standard. As the MPEG files to edit are temporary in most cases they have quite high video bandwith (~ 8000 kbps avg.) and LPCM has 1536 kbps which exceeds 9500 kbps. So this is only usable on video files which are already transcoded into the final bitrate resolution.
vurbal: Mayabe it is really a good idea for the moment using VOB files. DVD-lab can even handle high bitrates after ignoring the warning that it will exceed DVD standard limits. BTW, is a VOB file renamed to MPG a real standard conforming MPEG file that will be usable by any other MPEG editor?
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Staff Member
2 product reviews
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21. February 2004 @ 12:46 |
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A VOB is a standard MPEG-2 file with some additional information added. A standard decoder will just ignore the extra stuff and play it normally. I've never tried editing it as an MPEG so I can't say for sure about that, but I'm guessing it shouldn't be a problem.
Since you say you are starting out with MPEG files that have bitrates too high for DVD compliance, I'm curious if you're re-encoding the files before authoring or if you have some way of playing them that will allow you to use non-standard bitrates. If you're re-encoding, you might want to look into using AviSynth for your editing. Then you could open use VirtualDubMod to save the edited audio.
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