[FFmpeg-user] What is 'yuv420p(tv, smpte170m, progressive)'?

[Mark Filipak]

On 05/19/2020 05:50 PM, Carl Eugen Hoyos wrote:
> Am Di., 19. Mai 2020 um 21:22 Uhr schrieb Mark Filipak
> <markfilipak.windows+ffmpeg at gmail.com>:
> 
>>> while "progressive" can theoretically be interlaced (or hard
>>> telecined) it is very unlikely.
>>
>> That statement seems contrary to the MPEG standard.
> 
> I have already explained to you that when we use term "interlaced",
> this is not related to the MPEG standard

Okay, then what does "progressive" mean? What does "smpte170m" mean? What does 
"smpte170m"+"progressive" mean?