how to make a blank MPEG2 video stream ?

[mrbruno]

hi !

I need to author a DVD with AC3 sound only (no video).

I guess the best way to achieve this is to mux
a 90 minute blank MPEG2 video stream with an AC3 soundtrack .

The problem is : I don't know how to make this blank video stream !

Can someone help me please ? How can I generate a 90 minute blank
MPEG2 video stream with minimal size ?

Thanks !

[Krismen]

I don't know how to make this blank video stream !
You can use blankvob:
http://www.iespana.es/jsoto

[Pato]

You can try a Slide show with a blank still and set it´s duration to whatever your ac3 file has.

[mudda_t]

Sony has an app (or did) called AC3 DVDBurn (i think), it would burn a dvd with ac3 (you supplied) just like an audio cd.
.
I don't know if they support it any more, I did a quick search and came up empty.

[Matthew]

I think Pato's suggestion is what you should be looking at, but avisynth's BlankClip function will produce what you originally asked.

e.g. BlankClip(length=1000,width=720,height=576,fps=25)

[jorel]

Originally posted by mrbruno
hi !

I need to author a DVD with AC3 sound only (no video).

I guess the best way to achieve this is to mux
a 90 minute blank MPEG2 video stream with an AC3 soundtrack .

The problem is : I don't know how to make this blank video stream !

Can someone help me please ? How can I generate a 90 minute blank
MPEG2 video stream with minimal size ?

Thanks !
do you need to encode the AC3 track or was using from some source?

if you need to encode the AC3 and in 2 channels(not 5.1), maybe that program( not free) help:
"Audio Format:
Select the audio encoding format: PCM (48kHz/16bits) has high quality which is similar with Audio CDs, the total playing time is up to 6 hours. PCM (96hHz/24bits) has the best quality, but total play time is only 2 hours.
---> AC3 (192kbps) has high quantity, the total playing time is up to 45 hours, and the quality is still good. If your DVD player supports, you can select AC3 (128kbps) to hold more audio files on one Audio DVD."

and you can do
"Theme:

Select the theme to customize how your Audio DVD looks like. It consists of a DVD menu and a title background image which will be displayed through the whole audio playback. You can click "Customize" to create your own theme."

---> more details: http://www.audio-dvd-creator.com/guide.htm

is one more option to your job! :)

[eb]

May be my case described in http://forum.doom9.org/showthread.php?s=&threadid=75255 can help you.
Make 1 frame video ,blank,black or interesting picture and mux it using Rejig program /DVD Author section/ with your AC3 audio stream.

eb

[mrbruno]

Thanks for all the replies , but...

I'll explain in detail what I need
to do...

In fact I can't use the slide show trick
because I need to add subtitles to the blank
video...

I ripped AC3 tracks from movies and I want
to re-author the DVDs just as the original ones
but with a black screen + subtitles instead of
the original video.

This may sound crazy but this is what I need to do...

Maybe someone can help me ? There must be a solution...

[2COOL]

@mrbruno

I concur with eb. This works. I created a blank VOB (VOB ID 1 and Cell ID 1) with BlankVOB (http://www.posunplugged.com/jsoto/). Demux the M2V out of this blank VOB with VobEdit (http://www.ifoedit.com/). Remuxed M2V and AC3 files with ReJig's (http://www.rejig.org/download.asp) DVD Author option. Simple. ;)

Originally posted by eb
May be my case described in http://forum.doom9.org/showthread.php?s=&threadid=75255 can help you.
Make 1 frame video ,blank,black or interesting picture and mux it using Rejig program /DVD Author section/ with your AC3 audio stream.

eb

[mrbruno]

OK, I've just tried blankvob and vobedit !

This is fine but one big problem : I get a 70 MB M2V
file for only 7 minutes of black video screen !
For a 100 min files, this will mean 1 GB !
I don't want to waste so much space...
Maybe I need to tweak the number of vob ids and cell ids in
blankvob ? But I don't know anything about it...

[2COOL]

Originally posted by mrbruno
This is fine but one big problem : I get a 70 MB M2V
file for only 7 minutes of black video screen !:eek::eek: 70 MB M2V from a single 10KB blank VOB? In your case, don't change the default VOB and Cell IDs.

[mrbruno]

yes... I messed with the settings...
I've tried again and now i get a 10Kb vob file.

Then I demuxed it with vobedit.

OK. So I got a 7 Kb M2V file.

Then I authored it in rejig with a 52 minute AC3 track
+ a xxxx.sup file for subtitles.

Result : I tried to play it in Powerdvd and ... problems :

1 : Can't use the navigation slider (this is very important for me)
2 : Subtitles aren't displayed (although I switched them on)

[eb]

you must change your timebase from video to audio timebase.
I don't remember however how i was doing this in the past but sure it is possible.

eb