Pko
9th February 2002, 00:49
I've found that a stream that contains NO VIDEO, just audio, is interpreted by the player as NTSC or PAL!
I've created a menu with audio. I did that with 2 menus; first one has only a still image in high resolution (720x576, PAL), just 1 loop (so the image is displayed and immediately goes to the option in timeout) and the timeout leads to another menu
That other menu has an MPG that is just audio, and also is where the "real" options are chosen (the first menu is "operative" for as long as takes display the still image on screen, so the user has no time to press a key)
But it did not work! the image appeared, immediatley the screen went blank and the sound started. The options in the menu worked OK... I noticed a small glitch in my TV (is multisystem, NTSC/PAL) and that gave me a clue... I went to the configuration of the DVD player and I specified not a multisystem TV, but a PAL TV... Doing so, the menu worked OK! but it will not work for anyone that has a multisystem TV and a correctly configured DVD player, so that was not a good solution.
So what I did was encode my menu image in NTSC; that worked regardless the setting in TV system, but I am not satisfied because:
1) the image quality is slighty worst (720x480 instead of 720x576)
2) I still has a small glitch when the system changes, going from menu to movie (PAL) or returning from movie to menu
Do somebody know how to force the audio to be interpreted as PAL? perhaps a setting or a hack in the MPEG headers or perhaps an option in VCDImager (I use VCDImager, editing the XML file by hand, form a template I did once with VCDcomposer, an excelent tool not covered in the otherwise very good Doom9's guides)
I've created a menu with audio. I did that with 2 menus; first one has only a still image in high resolution (720x576, PAL), just 1 loop (so the image is displayed and immediately goes to the option in timeout) and the timeout leads to another menu
That other menu has an MPG that is just audio, and also is where the "real" options are chosen (the first menu is "operative" for as long as takes display the still image on screen, so the user has no time to press a key)
But it did not work! the image appeared, immediatley the screen went blank and the sound started. The options in the menu worked OK... I noticed a small glitch in my TV (is multisystem, NTSC/PAL) and that gave me a clue... I went to the configuration of the DVD player and I specified not a multisystem TV, but a PAL TV... Doing so, the menu worked OK! but it will not work for anyone that has a multisystem TV and a correctly configured DVD player, so that was not a good solution.
So what I did was encode my menu image in NTSC; that worked regardless the setting in TV system, but I am not satisfied because:
1) the image quality is slighty worst (720x480 instead of 720x576)
2) I still has a small glitch when the system changes, going from menu to movie (PAL) or returning from movie to menu
Do somebody know how to force the audio to be interpreted as PAL? perhaps a setting or a hack in the MPEG headers or perhaps an option in VCDImager (I use VCDImager, editing the XML file by hand, form a template I did once with VCDcomposer, an excelent tool not covered in the otherwise very good Doom9's guides)