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Thread: MPEG audio not compliant

  1. #1
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    MPEG audio not compliant

    When creating a DVD using DVDWS, it allows me to select LPCM or MPEG as my audio type. Since this video came from a non-AC3 source (SA), I selected MPEG. It then displayed a message saying that it is a non-standard audio type. The disc plays fine on my Apex player, but has no audio on my friend's Sony.

    If I choose LPCM instead, will DVDWS convert it to a compliant format when compiling the disc?
    Alternatively, can I convert the audio to AC3 using BeSweet and mux it using TyMplex or TMPGEnc?

  2. #2
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    You don't need to use besweet, tystudio can convert to AC3.
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  3. #3
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    I believe LPCM is an uncompressed PCM format (like WAV on windows). It should be avoided unless you are trying to fill your DVD full with audio data.

    I always trancode to 2 channel AC3 audio when my target is a DVD. Most players will deal with mp2 audio, but its not in the official DVD spec (AC3 AKA dolby digital is part of the spec).

  4. #4
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    Originally posted by FreydNot
    I always trancode to 2 channel AC3 audio when my target is a DVD. Most players will deal with mp2 audio, but its not in the official DVD spec (AC3 AKA dolby digital is part of the spec).
    Freyd, got a dumb question maybe, but do you add the MPEG video and AC3 audio as elemental streams to DVD WS, or do you remux the MPEG video with the AC3 audio before you load it into DVD WS?

    Thanks
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  5. #5
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    Actuall, I make elemental streams and feel those to DVD Meastro. But same difference

  6. #6
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    Thanks

    Thanks to all who responded. I will convert to AC3 from now on to ensure compliancy.

    AFAIK, it shouldn't matter if you remux and import the muxed stream, or use elemental streams in your DVD authoring program. If you can use the elementals, great. One less step to worry about. In my case, I need to edit out commercials and therefore need to remux before editing.

  7. #7
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    Hey brett63,

    What was the final resolution to this?

    I also have a Sony and it does not like MPEG II audio - only Dolby Digital...

    Did you figure out an easy way to get these to play on the Sony?

    Thanks!


    -Mike

  8. #8
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    I ended up using tyStudio to process the audio. It has an excellent transcoding engine that converted it to 2 channel 48k AC3 @ 192 kbps.

    Besweet does a great job as well, but to use it you have to first split the streams, convert and then remux. I wrote a batch file to leverage the tyProcess executable to do the conversion in a single step.

    I'm sure that Josh's update will yield similar results.

  9. #9
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    Interesting!

    Now for a really stupid question (as I am used to tytools doing everything for me)

    What exactly do I do with the MPEG files after TyStudio is done with them?

    -Mike

  10. #10
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    That depends on whether you created mpeg files or split them into elemental streams. Using a compatible authoring program, you can import the elemental streams (SpruceUp & DVD Maestro) or the mpegs (DVD Movie Factory & DVD Workshop) and create a compilation that can be burned to DVD. You can add menus with graphics and add chapter stops to make it easier to navigate throught he disc. This is what the whole extraction process is all about. The end result of extraction is to be able to copy your favorite shows to DVD and play them back on a set top player.

    For those of you having problems getting your DVDs to play in a Sony, I'd recommend getting a newer model. I have a Sony DVP-NS715P and it does a great job of playing my ty DVDs without a problem (the vast majority of them have mpeg layer II audio).
    Last edited by captain_video; 06-28-2003 at 06:54 AM.
    Please don't PM me or any other members looking for personal assistance. You'll do better by posting (after you've exhausted the search feature, of course) and taking advantage of the collective expertise of the membership instead of a single individual that may or may not be able to help you. Thank you and enjoy your stay at DDB!

  11. #11
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    Originally posted by jmhenry5150
    Hey brett63,

    What was the final resolution to this?

    I also have a Sony and it does not like MPEG II audio - only Dolby Digital...

    Did you figure out an easy way to get these to play on the Sony?

    Thanks!


    -Mike
    The strange thing is that my Sony PS2 doesn't seem to have a problem with the MPEG2 audio...

  12. #12
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    brett63 -

    Can you share your workflow as well as the batch process that you have?

    I'm considering buying a new SONY DVD player - but I would like to try other options first...

    -Mike

  13. #13
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    captain_video -

    Can you confirm, once again, that the SONY DVP-NS715P plays TyDVD's that have MPEG II audio?

    I think I will bit the bullet and sell the DVP-NS700P and upgrade - but before I do it, I need a little hand holding

    BTW - I will be using TyTools to create my TyDVD's...

    Thanks!

    -Mike

  14. #14
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    Originally posted by jmhenry5150
    captain_video -

    Can you confirm, once again, that the SONY DVP-NS715P plays TyDVD's that have MPEG II audio?

    I think I will bit the bullet and sell the DVP-NS700P and upgrade - but before I do it, I need a little hand holding

    BTW - I will be using TyTools to create my TyDVD's...

    Thanks!

    -Mike
    I can confirm that, mine plays TyTool_DVD's fine.
    ~Hi8

    (4) Hughes SD DVR40
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  15. #15
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    Mar 2003
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    Mike,

    Here is what I am doing right now:
    1. Extract video using TyTool7R3: VSplit mode, Patch Audio Holes.

    2. Use tyStudio tools (tyTranscode, tyMplex) to convert audio to
    AC3 and multiplex into single MPEG file (see batch file below).

    3. Edit commercials using MPEG2VCR.

    4. Create DVD with DVD Workshop.

    Now, here is why I do it this way:
    1. I use TyTool instead of TyStudio because it doesn't require me to install an indexing daemon on the TiVo. Hopefully future versions will allow me to disable the resource-hungry TiVo side editing feature.

    2. tyStudio gives a nifty console for doing all types of processing, but it takes a couple of minutes to load each file (creates a frame index). This wouldn't be a big deal if I was using it to edit, but I'm not. So, I wrote 2 batch files to process the stuff:

    File #1: process.bat
    if exist "%~dpn1.mpg" goto end
    "C:\Program Files\tyStudio\typrocess.exe" -iv %1 -ia "%~dpn1.m2a" -o "%~dpn1.mpg" -mplex { -f 8 } -demux -tcode { -b 192000 -s 48000 -a }
    :end

    File #2: allfiles.bat
    for %%1 in (c:\mpegsrc\*.m2v) do call c:\temp\process.bat "%%1"

    To process all of the files in my source directory (c:\mpegsrc), I just double-click on the allfiles.bat file. To process a single file, I drag and drop the .m2v on the process.bat file.

    3. What can I say? I'm a sucker for frame-accurate editing. MPEG2VCR does this very well.

    4. My streams are already 720x480 (SA), so no need to patch the header. Pr.Sinister created an excellent Flash demo on using DVD Workshop. Always worked well for me.

    My suggestion would be to wait until the next release of TyTool before tossing away your DVD player. Audio is relatively simple to fix, compared to video issues. There are several ways to accomplish the results you want, depending on what tools you have access to.

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