3 ms·

Justin.tv goes High Def

27 points by kvogt 18y ago

ardit33 18y ago
"Im pleased to announce that today Justin.tv officially supports DVD quality broadcasting using the h264 video codec - and it even works on a Mac!" DVD quality, not HI-DEF (720p) But I guess DVD quality on the internet is Hi-Def when you compare to youtube quality.
- kvogt 18y ago
  You can broadcast in 720p resolution, but most users choose not to since the player is only 320x240 (unless you go to full screen mode).
- deleted 18y ago
  [deleted]
jonknee 18y ago
Maybe I'm missing something, but the suggested HD examples still look like shit.
- abstractbill 18y ago
  Looks like /officecam has a bad usb cable. We'll fix it soon.
nickb 18y ago
Out of curiosity, what's the average percentage increase in bandwidth required to stream a H.264 stream over the Sorenson/On2? Anyone know?
- timr 18y ago
  You can usually get a smaller stream for a given quality with H.264.
- DarkShikari 18y ago
  Increase? Why would a better format use more bitrate for the same quality? Generally, H.264 is 2-3x (or more) better than FLV1/Sorenson H.263, and 1.5-2x better than VP6, but it depends on the encoder and the bitrate. In general, the lower the bitrate, the greater the advantage of H.264. Note the encoders vary dramatically: Apple's, for example, is so bad I would be completely unsurprised if VP6 won out in a comparison. Fortunately, basically everyone doing H.264-in-Flash is using x264. Unfortunately, not all of them have a clue what they're doing...
  - nickb 18y ago
    Increase? Why would a better format use more bitrate for the same quality? HD is not of the same quality.
    - DarkShikari 18y ago
      Sure, but HD doesn't imply H.264, nor does H.264 imply HD; the choice of resolution and the choice of video format are completely orthogonal.
      - nickb 18y ago
        Pretty much every video site out there (from YouTube down) are encoding HD videos at higher resolution. For example, YouTube's SD video is 320x240 and their HD is at 448x336. What you're suggesting is technically true but not really based in reality.
        DarkShikari 18y ago
        What you said isn't true either--and I can confirm it, because two weekends ago I met with the guy who wrote the Youtube video encoder ;) Youtube has no "HD video"; the "High Quality" mode just sends you to the H.264 video, which isn't there for the primary purpose of being "Higher Quality"--its in iPhone-compatible Baseline Profile, for the purpose of being compatible for mobile devices, in particular phones and such that they intend to provide support for. If Google was really aiming at "higher quality" they would have chosen full-on High Profile H.264, but they intentionally chose Baseline for mobile compatibility. Apparently storage was at enough of a premium that they explicitly chose not to have two formats available, and just chose the most compatible option. The resolution chosen for the H.264 encoder is different because its meant to be targeted at the iPhone. Again, the "higher quality" mode is a secondary feature; the real purpose is to target mobile devices. Edit: Also, reading your post, what you said makes no sense--"they're encoding HD videos at higher resolution", well, obviously, that's what HD means. Are you sure you didn't mean to say "they're encoding H.264 videos at higher resolution"?

27 points by kvogt 18y ago

"Im pleased to announce that today Justin.tv officially supports DVD quality broadcasting using the h264 video codec - and it even works on a Mac!" DVD quality, not HI-DEF (720p) But I guess DVD quality on the internet is Hi-Def when you compare to youtube quality.

kvogt 18y ago
You can broadcast in 720p resolution, but most users choose not to since the player is only 320x240 (unless you go to full screen mode).
deleted 18y ago
[deleted]

jonknee 18y ago

Maybe I'm missing something, but the suggested HD examples still look like shit.

abstractbill 18y ago
Looks like /officecam has a bad usb cable. We'll fix it soon.

nickb 18y ago

Out of curiosity, what's the average percentage increase in bandwidth required to stream a H.264 stream over the Sorenson/On2? Anyone know?

timr 18y ago
You can usually get a smaller stream for a given quality with H.264.
DarkShikari 18y ago
Increase? Why would a better format use more bitrate for the same quality? Generally, H.264 is 2-3x (or more) better than FLV1/Sorenson H.263, and 1.5-2x better than VP6, but it depends on the encoder and the bitrate. In general, the lower the bitrate, the greater the advantage of H.264. Note the encoders vary dramatically: Apple's, for example, is so bad I would be completely unsurprised if VP6 won out in a comparison. Fortunately, basically everyone doing H.264-in-Flash is using x264. Unfortunately, not all of them have a clue what they're doing...
- nickb 18y ago
  Increase? Why would a better format use more bitrate for the same quality? HD is not of the same quality.
  - DarkShikari 18y ago
    Sure, but HD doesn't imply H.264, nor does H.264 imply HD; the choice of resolution and the choice of video format are completely orthogonal.
    - nickb 18y ago
      Pretty much every video site out there (from YouTube down) are encoding HD videos at higher resolution. For example, YouTube's SD video is 320x240 and their HD is at 448x336. What you're suggesting is technically true but not really based in reality.
      - DarkShikari 18y ago
        What you said isn't true either--and I can confirm it, because two weekends ago I met with the guy who wrote the Youtube video encoder ;) Youtube has no "HD video"; the "High Quality" mode just sends you to the H.264 video, which isn't there for the primary purpose of being "Higher Quality"--its in iPhone-compatible Baseline Profile, for the purpose of being compatible for mobile devices, in particular phones and such that they intend to provide support for. If Google was really aiming at "higher quality" they would have chosen full-on High Profile H.264, but they intentionally chose Baseline for mobile compatibility. Apparently storage was at enough of a premium that they explicitly chose not to have two formats available, and just chose the most compatible option. The resolution chosen for the H.264 encoder is different because its meant to be targeted at the iPhone. Again, the "higher quality" mode is a secondary feature; the real purpose is to target mobile devices. Edit: Also, reading your post, what you said makes no sense--"they're encoding HD videos at higher resolution", well, obviously, that's what HD means. Are you sure you didn't mean to say "they're encoding H.264 videos at higher resolution"?