[FFmpeg-user] Glossary: d-NTSC & d-PAL

Mark Filipak (ffmpeg) markfilipak at bog.us
Fri Oct 2 00:13:35 EEST 2020

On 10/01/2020 03:21 PM, Jim DeLaHunt wrote:
> OK, then I think what you have — what you put in your text attachment "d-NTSC & d-PAL .txt" in your 
> previous message — is two single-line glossary entries, conjoined with entries from a table mapping 
> H.262 Metadata Values to video types d-NTSC and d-PAL.

Well, that deserves an answer. There are two parts to each glossary entry: 1, A simple statement of 
what a thing is, and 2, a "distinguished by" identification so that readers can identify the thing. 
The table is the "distinguished by" part. I formatted it as a table to make it easy, or at least so 
I thought! :-)

For example, d-NTSC is distinguished via MPEG-PS binary metadata:
'progressive_sequence' == 0 & 'progressive_frame' == 0 & 'aspect_ratio_information' == 0010 & 
'frame_rate_code' == 0100 & 'horizontal_size_value' == 0010 1101 0000 & 'horizontal_size_extension' 
== 00 & 'vertical_size_value' == 0001 1110 0000 & 'vertical_size_extension' == 00.

That's the logic. Putting the table into a different glossary entry wouldn't work, but obviously, 
the way I'm doing it now is a FAIL.

I'll try again.

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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