[TriLUG] myth tv question

[Joel Ebel]

Wow... 6 messages from me in one day to the list.  Must be a ..... ok, 
I'll stop. :(  ...at 7.

Joel

Joel Ebel wrote:
> 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
>>> The OpenNMS Group, Inc.
>>> Main  : +1 919 545 2553   Fax:   +1 503-961-7746
>>> Direct: +1 919 647 4749   Skype: tarusb
>>> Key Fingerprint: 8945 8521 9771 FEC9 5481  512B FECA 11D2 FD82 B45C
>>>
>>> --TriLUG mailing list        : 
>>> http://www.trilug.org/mailman/listinfo/trilug
>>> TriLUG Organizational FAQ  : http://trilug.org/faq/
>>> TriLUG Member Services FAQ : http://members.trilug.org/services_faq/