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

[Mark Filipak (ffmpeg)]

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. ...

Each entry is just one sentence, so I guess you don't like the sentence spanning multiple lines (?)

The sentence is a statement followed by a list of metadata that distinguishes the subject... so that 
people can determine whether a particular video is a d-NTSC video or not a d-NTSC video for example. 
The main distinguishing feature is 'progressive_sequence' = 0 & 'progressive_frame' = 0 of course. 
The others narrow the scope to just a single species of video.

If a glossary entry requires explanation, then it's a fail. What fails? I guess I didn't anticipate 
such a total-failure mode.

Do you have any suggestions? Should I just forget this glossary idea?

>... The rest seems to be a description of a data structure or representation. The entry 
> doesn't say to what format or specification the representation applies. To an MPEG-2 video? To a the 
> ISO file corresponding to a DVD?


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