[FFmpeg-user] Glossary: d-NTSC & d-PAL
Mark Filipak (ffmpeg)
markfilipak at bog.us
Thu Oct 1 20:50:40 EEST 2020
On 10/01/2020 01:03 PM, Jim DeLaHunt wrote:
> On 2020-10-01 06:27, Mark Filipak (ffmpeg) wrote:
>
>> On 09/30/2020 11:56 PM, Jim DeLaHunt wrote:
>>> On 2020-09-30 20:36, Mark Filipak (ffmpeg) wrote:
>>>
>>>> Continuing with relatively non controversial entries:
>>>>
>>>> d-NTSC [noun]: 1, The digital equivalent of NTSC distinguished by
>>>> binary metadata:
>>>> 720 samples/row: 'horizontal_size_value' = 0010 1101 0000
>>>> 'horizontal_size_extension' = 00
>>>> 480 rows: 'vertical_size_value' = 0001 1110 0000
>>>> 'vertical_size_extension' = 00
>>>> 4:3 DAR: 'aspect_ratio_information' = 0010
>>>> 30/1.001 FPS: 'frame_rate_code' = 0100
>>>> 'progressive_sequence' = 0 & 'progressive_frame' = 0
>>>>
>>>> d-PAL [noun]: 1, The digital equivalent of PAL distinguished by binary
>>>> metadata:
>>>> 720 samples/row: 'horizontal_size_value' = 0010 1101 0000
>>>> 'horizontal_size_extension' = 00
>>>> 576 rows: 'vertical_size_value' = 0010 0100 0000
>>>> 'vertical_size_extension' = 00
>>>> 4:3 DAR: 'aspect_ratio_information' = 0010
>>>> 25 FPS: 'frame_rate_code' = 0011
>>>> 'progressive_sequence' = 0 & 'progressive_frame' = 0
>>>
>>>
>>> It seems to me that these are no longer glossary entries — or, only the first line of each is a
>>> glossary entry. ...
>>
>> …The sentence is a statement followed by a list of metadata that distinguishes the subject...
>> Do you have any suggestions? Should I just forget this glossary idea?
>
>
> What makes sense to me is a glossary which includes the entries:
>
> d-NTSC [noun]: 1, The digital equivalent of NTSC
>
> d-PAL [noun]: 1, The digital equivalent of PAL
>
> Then a table of XYZ metadata entries which have been found in the wild:
Actually, not in the wild. They are from H.262.
> [Display the following table with fixed-width font]
Actually, Jim, what you sent is not in fixed-width font. :-)
So, you favor a formal table? I don't, but I guess that could go without saying, eh?
I format in plain text at 148 columns. I've found 70 columns to be too restricting and promotes
crypticism (...is there such a word?). Personally, I don't think formal tables are needed, but if
you do, then I'll make a formal table. But first, take a look at the current version, attached.
--
What if you woke up and found yourself in a police state?
African-Americans wake up in a police state every day.
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d-NTSC [noun]: The digital equivalent of NTSC. d-NTSC is distinguished via MPEG-PS binary metadata:
'progressive_sequence' = 0 + 'progressive_frame' = 0 ...is a scan frame
'aspect_ratio_information' = 0010 + 'frame_rate_code' = 0100 ...4:3 DAR + 30/1.001 FPS
'horizontal_size_value' = 0010 1101 0000 + 'horizontal_size_extension' = 00 ...720 samples/row
'vertical_size_value' = 0001 1110 0000 + 'vertical_size_extension' = 00 ...480 rows
d-PAL [noun]: The digital equivalent of PAL. d-PAL is distinguished via MPEG-PS binary metadata:
'progressive_sequence' = 0 + 'progressive_frame' = 0 ...is a scan frame
'aspect_ratio_information' = 0010 + 'frame_rate_code' = 0011 ...4:3 DAR + 25 FPS
'horizontal_size_value' = 0010 1101 0000 + 'horizontal_size_extension' = 00 ...720 samples/row
'vertical_size_value' = 0010 0100 0000 + 'vertical_size_extension' = 00 ...576 rows
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