LPCM indicated, but no audio

[Grandpa Simpson]

I recently captured an HDTV MPG. The MPG played fine with audio in Media Player. I made a DVD from the MPG with Power Producer. THe result had fine video, but no sound in either a DVD player or my PC. File
information for the VOB files shows it has LPCM 2.0 audio(just a wave file?) but I hear nothing. How can I fix?

[yoda313]

Hello,

You could try converting the lpcm to .ac3. Ac3 is the main audio spec for dvd. It might work better. Though I don't have direct experience with hdtv.

Kevin

[J3M]

A lot of times the LPCM audio is headerless, which seems to cause some problems with some players. I usually use an audio converter to make it a WAV file with header. As already stated, converting it into AC3 would make it more compatible.

[tedkunich]

Hello,

You could try converting the lpcm to .ac3. Ac3 is the main audio spec for dvd. It might work better. Though I don't have direct experience with hdtv.

Kevin

EVERY DVD player MUST play PCM audio to be compatible with the DVD specifications. AC3 support is also required on NTSC systems while MP2 is required on PAL systems. In either case, PCM should play on every player - as long as the specifications are adhered to.

@ Grandpa Simpson

Not sure, but have you tried a different authoring program? Also, is the PCM @ 48KHz? Most PC's capture 44kHz by default. Most SA players will not play 44kHz PCM.

T

[Grandpa Simpson]

Hi,
Well I tried converting the audio to Ac3 and remuxing the files. I got another movie with no audio. I tried doing it twice to make sure, no luck.
I wonder if I totally lost the audio some whow, but why would it be indicated as being there? Can't be.

Tried another DTV (not HD) MPG. It played in Media PLayer OK, but not in PowerDVD. Attempts to create a DVD of this movie using Power Producer caused the software to crash. It also has LPCM audio. Am I maybe just missing something on my system? 48khz was the bit rate fot the audio.

I used Power Producer for a lot of other projects with no problem.

I have roxio available to try - but it sucks for many reasons.

[Grandpa Simpson]

More info on this.... Roxio and Nero Ultra also failed to produce audio. DVDSanta and AuroraMPG2DVD produced a dvd with audio.

Anybody know what the differences and maybe where the problem might be???? Cyberlink support has been "trying" - nothing to resolve the problem.....

[Nelson37]

Since the video in question came from a capture, don't you think it might be relevant to include some info on capture hardware, capture software and settings used??????

Try loading the cap in VdubMod and see what info it gives about audio types. The time-honored solution of saving the audio as a WAV file, then re-muxing and/or converting to AC-3 fixes most such problems. I note you unsuccessfully tried a similar process, using what software??? Did you try to play the resulting AC3 file by itself? Did you play the WAV before that?

You state "48k was the bitrate for the audio". Do you mean the bitrate specified for the (unknown) capture software, or the bitrate given by some examination tool? These are not necessarily the same.

When you give information about the file, it is helpful to state clearly how this information was derived. Different programs can react differently to the same file, as you are already discovering.

Capped files are often non-standard in some (or several) ways. Most can be overcome fairly simply, once it is determined what they are.

[Grandpa Simpson]

Whoa dude, 'scuse my freakin' ignorance. Sorry I don't sit in front of my pc 25 hours a day while Star Trek is on in the background.

1. My DTV captures came from DVICO fusion II. The most recent s/w allows "capture native file" instead of the transport stream. There are no adjustments to be made to this. The MPGs appear to be "standard" enough to play in media players.

2. I get the same results if I capture a transports stream and convert it with HDTV2MPEG. No audio - except in DVD Santa, and aurora so far.

3. My bit rate info came from AVICodec, I think or another tool.

4. My unsuccessfull remuxing attempts were done following a procedure a found on this site. WHat did I use...IFOEDIT, Besweet, VobEdit....

[Nelson37]

Instructions were given for some procedures to help in identifying and solving your problem. If you wish to follow them and report back on results, I and most likely others will assist in solving your problem. I personally have no need for attitude.

DVD playback in a standalone calls for specific format of MPEG file. These are detailed in the What is DVD section on this site. Media player requires no such specific format. Stating a file is "standard" enough for media player means absolutely nothing, there are very few files media player will not play.

Resolution numbers on file? Bitrate?

There are probably dozens of De/Re Muxing guides on this site. In order to diagnose a problem, precise information is needed else we are just guessing.

To repeat - load the capped file in VdubMod. Recommend starting with a standard resolution file. Check playability. Save the audio as a WAV file. Check playability. Convert audio to AC3 with BeSweet. Check playability. Run MPEG thru TMPGENC Merge and Cut. Check playability. Demux video. Remux with AC3. Check playability. Create DVD folder with authoring program. Check playability. Burn to DVD. Check playability on PC. Insert into standalone. If errors, report exact error message and at what stage it occurred.

[offline]

tedkunich,

MP2 is NOT required on PAL systems, it is
SUPPORTED. Just a pedantic point

[Nelson37]

Offline - to be equally pedantic, I understand your statement but do not see how it applies to me as I have not referred to PAL/MP2 at all.

[offline]

Nelson37, see edit