[access-uk] Re: For Dean: digiTV and demuxing the AD channel

  • From: Dean Wilcox <wilcoxdean@xxxxxxxxxxx>
  • To: access-uk@xxxxxxxxxxxxx
  • Date: Tue, 27 May 2008 13:23:22 +0100

Thanks, that all worked great. The MP3 I created in GoldWave now plays fine and I'm sure this will come in handy in the future for a few on list list.


At 11:22 27/05/2008, you wrote:
Hi Dean

Before I start, you won?t find this problem with radio shows as they never contain an AD track. Here?s how to demultiplex DigiTV TV recordings to strip apart the normal soundtrack and the audio description soundtrack.

First, open DigiTV as normal ? you may want to mute the sound by pressing the M key so that you can hear the prompts with Jaws or other screen reader.

Go into the file menu and down cursor four times to the tools item and press enter.

Right cursor twice to get onto the demultiplex tab.

Tab four times until you hear browse after the input file prompt. Press the spacebar to get to a normal windows open dialog box.

Press shift+tab to get into the file list of your recordings. Cursor down until you hear the name of the file you want to demultiplex. Now tab four times until you land on the open button and press the spacebar. You should hear jaws counting up towards 100%.

Now, here?s where things get interesting.

You are suddenly thrown back to the main DigiTV screen and wonder where the heck the demultiplex page has gone. However, don?t worry this is a bug in the software and all that has happened is that jaws has lost focus on the page. To return it to the focus, just press alt+tab and the windows will swap around
and you?re back in the demultiplex dialog box.

Now press tab until you land on the start demux button. Pres the spacebar and you will hear jaws reporting the percentage that DigiTV has demultiplexed the file. This may take one or two minutes depending on the size of the file. However the count never actually reaches 100%, it always appears to end at 99%. Now tab ten times until you land on the exit button and press spacebar and you will get back to the main DigiTV screen.

Close down DigiTV.

Now open your recordings folder and you will find that there are 3 new files, these will be the name of your recording plus 00c0.mp2, 00c1.mp2 and 00e0.m2v.

The file ending in 00c0.mp2 is the normal soundtrack, the file ending in 00c1.mp2 is the audio description soundtrack, which in your case should be silent.

You can play the 00c0.mp2 file in win amp or you can edit it in goldwave after it has converted it into an mp3.

HTH

Steve Green

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