[TriLUG] myth tv question
jbebel at ncsu.edu
Thu Oct 13 14:47:20 EDT 2005
Wow... 6 messages from me in one day to the list. Must be a ..... ok,
I'll stop. :( ...at 7.
Joel Ebel wrote:
> Wow... 5 messages from me in one day to the list. Must be a personal
> 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.
>> 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
>>> Am I off base here?
>>> Tarus Balog
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