4 ms·

Another fun thing with processing that most people don't realize: almost all TVs will internally convert the input signal to YCbCr 4:2:2 for all this processing

by brigade 15y ago

Another fun thing with processing that most people don't realize: almost all TVs will internally convert the input signal to YCbCr 4:2:2 for all this processing. Even though data is practically always transmitted as 4:4:4 over HDMI, and has to be converted back to RGB 4:4:4 to be displayed on the panel. So if you have red/blue text (or anything with red/blue detail) looking awful, like it was lower resolution than it is, you have the TV to thank for that. EDIT: to clarify, this doesn't apply if the text is a part of a movie (then you blame the codec for that, not the TV)

jpdoctor 15y ago
None of the broadcasts are 4:4:4, nor are the DVDs. Hell, some of those HD broadcasts are 4:2:0 in order to reduce bandwidth.
- brigade 15y ago
  Some? Practically every encoded video intended for end-users is 4:2:0 (and certainly everything in HDTV, Blu-ray, and DVD.) I meant mainly for consoles, computers, and subtitles (though for subtitles it also depends on your DVD player) so I amended my post.
  - jpdoctor 15y ago
    > and certainly everything in HDTV, Blu-ray, and DVD. The HD broadcasts are 4:2:2, more often than not. There are a few stations that have their video servers down at 4:2:0, but many of those are scheduled to upgrade over the next 2 years. Edit: The servers are 422, but the broadcasts are 420, as brigade points out. (The edit tag on my original comment has already expired. Grrr.)
    - brigade 15y ago
      ATSC only allows 4:2:0 in MPEG-2 (ATSC A/53 part 4 section 6.1.3) or H.264 high profile (which is restricted to 4:2:0). I'm admittedly not familiar with other countries, but I would be incredibly surprised if any of them allowed 4:2:2.
      - jpdoctor 15y ago
        Thank you, you are correct. I've assumed that the video settings of the server is what they were delivering, but there must be a down-sample on the way to the transmitter. (Cablelabs is the other large distribution format that we encounter, which yields the same story.)

by brigade 15y ago

jpdoctor 15y ago

None of the broadcasts are 4:4:4, nor are the DVDs. Hell, some of those HD broadcasts are 4:2:0 in order to reduce bandwidth.

brigade 15y ago
Some? Practically every encoded video intended for end-users is 4:2:0 (and certainly everything in HDTV, Blu-ray, and DVD.) I meant mainly for consoles, computers, and subtitles (though for subtitles it also depends on your DVD player) so I amended my post.
- jpdoctor 15y ago
  > and certainly everything in HDTV, Blu-ray, and DVD. The HD broadcasts are 4:2:2, more often than not. There are a few stations that have their video servers down at 4:2:0, but many of those are scheduled to upgrade over the next 2 years. Edit: The servers are 422, but the broadcasts are 420, as brigade points out. (The edit tag on my original comment has already expired. Grrr.)
  - brigade 15y ago
    ATSC only allows 4:2:0 in MPEG-2 (ATSC A/53 part 4 section 6.1.3) or H.264 high profile (which is restricted to 4:2:0). I'm admittedly not familiar with other countries, but I would be incredibly surprised if any of them allowed 4:2:2.
    - jpdoctor 15y ago
      Thank you, you are correct. I've assumed that the video settings of the server is what they were delivering, but there must be a down-sample on the way to the transmitter. (Cablelabs is the other large distribution format that we encounter, which yields the same story.)