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creating mpeg-2 - why no audio?

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J. Tad Newberry
creating mpeg-2 - why no audio?
on May 21, 2010 at 4:18:47 pm

A network wants our show delivered via ftp as an mpeg-2, but whether i tried it out of an FCP timeline via Compressor, or make a QT them drop it onto a droplet, i get a video with no audio. Any help?


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Michael Sacci
Re: creating mpeg-2 - why no audio?
on May 21, 2010 at 4:48:44 pm

and all you compressor settings are?

Have you setting Multiplexing in the Extras tab?


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J. Tad Newberry
Re: creating mpeg-2 - why no audio?
on May 21, 2010 at 6:13:27 pm

settings are all default mpeg-2 (Program stream) Compressor settings

Extras / Multiplexed MPEG-1/Layer 2 Audio is checked and Program Stream selected (both of these by default)

thanks for the attention

Thanks again!

J. Tad Newberry
Big Ya Productions
Mac Pro 2.66 GHz Quad-Core
3 GB RAM
http://www.bigya.tv


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Chris Babbitt
Re: creating mpeg-2 - why no audio?
on May 22, 2010 at 7:36:47 pm

Try Transport Stream. That's what I use, and I get audio every time.



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Dave LaRonde
Re: creating mpeg-2 - why no audio?
on May 21, 2010 at 5:29:22 pm

[J. Tad Newberry] "A network wants our show delivered via ftp as an mpeg-2.."

Do you happen to have the delivery specs for that mpeg2 file? I'd look them over very carefully.

Mpeg2's for broadcast typically have a much higher bitrate than the files you can make using standard Apple products. You may need a specialized -- and pricey -- ecryption application specifically for broadcast.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Michael Cheung
Re: creating mpeg-2 - why no audio?
on May 21, 2010 at 5:56:29 pm

If you're using the Elementary Stream setting in Compressor I don't think it'll export audio.

Michael Cheung

Editor/Assistant Editor/DIT

http://www.filmcutter.co.uk


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J. Tad Newberry
Re: creating mpeg-2 - why no audio?
on May 21, 2010 at 6:15:55 pm

delivery specs specify "CBR Bitrate: 8Mbs" and the default Compressor setting was two pass VBR, avg 15Mbps and Max at 20Mbps, so it seems to be making the video at a high enough quality, though on playback, it sure doesn't look like something i would want to air! : )

Thanks again!

J. Tad Newberry
Big Ya Productions
Mac Pro 2.66 GHz Quad-Core
3 GB RAM
http://www.bigya.tv


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Dave LaRonde
Re: creating mpeg-2 - why no audio?
on May 21, 2010 at 6:19:05 pm

[J. Tad Newberry] "...delivery specs specify "CBR Bitrate: 8Mbs""

Wow, that IS low. I've seen 'em as high as 35Mbs, hence my concern.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Steve Eisen
Re: creating mpeg-2 - why no audio?
on May 21, 2010 at 7:47:18 pm

Episode Pro from Telestream!

Steve Eisen
Eisen Video Productions
Vice President
Chicago Final Cut Pro Users Group


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Michael Gissing
Re: creating mpeg-2 - why no audio?
on May 22, 2010 at 1:00:15 am


8Mbs is normal for SD if that is what is required. If the specs ask for CBR 8Mbs, why are you using VBR at higher bit rates?


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Rafael Amador
Re: creating mpeg-2 - why no audio?
on May 23, 2010 at 2:26:45 am

Hi Tad,
The audio is there, but QT can not play it.
Play the file with MPGStreamclip to check that.
rafael

http://www.nagavideo.com


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Roy Stewart
Re: creating mpeg-2 - why no audio?
on Sep 1, 2010 at 2:45:10 pm

I am trying to make an MPEG-2 file from a quicktime movie using Compressor and the video is fine but there is no audio. I have tried to make it exporting straight from Final Cut Pro and also just as a self contained quicktime movie - and no joy either way. Anyone any ideas? All suggestions very, very welcome.


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Dave LaRonde
Re: creating mpeg-2 - why no audio?
on Sep 1, 2010 at 3:45:43 pm

What preset did you use in Compressor? Did it have audio? What kind of audio?

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Roy Stewart
Re: creating mpeg-2 - why no audio?
on Sep 1, 2010 at 4:45:19 pm

Hi Dave

I used both Programme and Transport Streams, both unsuccessfully. Video in MPEG2 fine - but no audio.

The audio is just part of the preset MPEG audio @ 48kHz.

To give the full background. I filmed on XDCAM HD and made the movie in final Cut Pro an an HD movie. I have tried making self contained and reference qt movie files and imported them to Compressor - and also exported direct from FC Pro into Compressor. Nothing works. The resultant MPEG2 video is fine - but the audio just disappears. HELP!!!!!!!!!


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Dave LaRonde
Re: creating mpeg-2 - why no audio?
on Sep 1, 2010 at 5:11:26 pm

Eliminate the obvious: make sure the files you esport from FCP actually HAVE audio. If they don't, you can looks elsewhere for the problem.

And you might give MPEG Streamclip a shot, too.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Roy Stewart
Re: creating mpeg-2 - why no audio?
on Sep 1, 2010 at 5:19:52 pm

Yep. The files I am exporting do have audio. I'll try MPEG Streamclip as you suggest. Thank you.


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Roy Stewart
Re: creating mpeg-2 - why no audio?
on Sep 1, 2010 at 5:26:40 pm

Yep. The files I am exporting do have audio. I'll try MPEG Streamclip as you suggest. Thank you. I have just had a look at MPEG Streamclip but it doesn't seem to export to MPEG-2, just MPEG-4.


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David Roffman
Re: creating mpeg-2 - why no audio?
on Mar 14, 2012 at 5:17:29 pm

Funny running across this now, a year later.
I was having the exact same problem, but once I tried program stream, the audio came with it. I have no idea why.

Now I'm trying to figure out how to get my MPEG-2 files authored to a DVD.
Any suggestions?


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