[TriLUG] myth tv question

[Joel Ebel]

Wow... 5 messages from me in one day to the list.  Must be a personal 
record.

Joel

Joel Ebel wrote:
> You are mistaken.  NTSC DVDs and PAL DVDs are encoded differently.  NTSC 
> DVDs are encoded at 29.97 fps interlaced video, and PAL DVDs are encoded 
> at 25 fps interlaced video.  In addition, PAL has more 576 scan lines as 
> opposed to 480 for NTSC.
> 
> However, many DVDs are created from film which is at 24 fps, and DVDs 
> can contain the data at 24 fps progressive.  They also contain MPEG-2 
> repeat_first_field flags in the video to tell the decoder to perform a 
> 2-3 pulldown on an NTSC dvd.  In the case of a PAL DVD, the flags tell 
> the decoder to perform a 2-2 pulldown which results in a 4% speedup at 
> 50 Hz.  Even though the source is the same, the flags are different for 
> NTSC and PAL discs.  Again, the resolution is also higher on the PAL 
> discs as well, so they take up more space.
> 
> The dvd faq at dvddemystified.com has some good information on this.
> 
> As for encoders that can translate, I'm not certain, but you might try 
> out ffmpeg or mencoder.  Maybe VLC could do something like this.
> 
> Joel
> 
> Tarus Balog wrote:
>>
>> On Oct 13, 2005, at 1:40 PM, Greg Brown wrote:
>>
>>>> Speaking of which, does anyone know of a tool (or set of tools) on
>>>> Linux which can "reencode" (or whatever the correct term is) a PAL DVD
>>>> to NTSC. In other words, I'd like to be able to rip a PAL DVD so that
>>>> I could watch it on a regular DVD player and not just on a computer.
>>
>> I didn't think there was a difference at the DVD level between PAL and 
>> NTSC - that would depend on your DVD player and the output signal it 
>> creates. The DVDs should be the same except for region codes (and you 
>> might be able to turn your DVD player regionless with the right hack).
>>
>> Am I off base here?
>>
>> -T
>>
>> -----
>>
>> Tarus Balog
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