Streaming HD not possible?

Discussion in 'Apple TV and Home Theater' started by dollarbillz, Jan 23, 2009.

  1. dollarbillz macrumors member

    Joined:
    May 29, 2008
    #1
    I converted a movie its bout a 7 gig file but i cant see it on my apple tv did apple fix the bug yet where u cant stream files over 4 gigs? if i were to put it on the actual unit would this solve it?

    Its

    1280X720 Apple Legacy Codec because if i went regular apple tv codec it was goind 968X720 tired it this way worked with no sound.


    So my 7 gig file works perfect on QT and Itunes even imports just cant see it on apple tv

    and the 968X720 file is like 2 gigs in size but no sound? but has the HD sign on apple tv

    any suggestions
     
  2. jaw04005 macrumors 601

    jaw04005

    Joined:
    Aug 19, 2003
    Location:
    AR
    #2
    The Apple TV only supports files that are:

    "H.264 and protected H.264 (from iTunes Store): Up to 5 Mbps, Progressive Main Profile (CAVLC) with AAC-LC audio up to 160 Kbps (maximum resolution: 1280 by 720 pixels at 24 fps, 960 by 540 pixels at 30 fps) in .m4v, .mp4, and .mov file formats.

    iTunes Store purchased video: 320 by 240 pixels, 640 by 480 pixels, 720 by 480 pixels (anamorphic), or high-definition 720p

    MPEG-4: Up to 3 Mbps, Simple Profile with AAC-LC audio up to 160 Kbps (maximum resolution: 720 by 432 pixels at 30 fps) in .m4v, .mp4, and .mov file formats"

    http://www.apple.com/appletv/specs.html

    If the Apple TV preset defaulted your file to 960x540, it's likely your video file was shot at 30 fps. You can manually force your video to export at 1280x720 at 24 fps. As long as you keep the bit rate under 5 Mbps (H.264 + AAC/AC3 audio), you should be fine.

    For reference, Apple encodes most of their HD TV Shows on the iTunes store at ~4000 kbps.

    5000 kbps (Video) + 128 kbps (Audio) = 5128 kbps = 5.0078125 Mbps
     

    Attached Files:

  3. dynaflash macrumors 68020

    Joined:
    Mar 27, 2003
    #3
    Though realize that a 29.976 fps source transcoded at 24 fps is likely to be "choppy" as it drops frames to keep the audio in sync.
     
  4. jaw04005 macrumors 601

    jaw04005

    Joined:
    Aug 19, 2003
    Location:
    AR
    #4
    Very true. How does Apple get around this? It is my understanding that they receive MPEG-2 masters from a third-party production house, and transcode those to H.264.

    At least they use to with MTV's iTunes store content. I know some of those shows were shot at 30 fps.

    "Blink Digital encoded each show as 15mbps MPEG-2 files with uncompressed audio. Apple performed the final transcode into protected MPEG-4 files."

    http://www.blinkdigital.com/pub_pdfs/PSNiTunes.pdf
     
  5. dynaflash macrumors 68020

    Joined:
    Mar 27, 2003
    #5
    you certainly could be correct. Some sources say that the movie houses to the trancoding. I can say I do not know how apple handles it. I do know that at least with hb manually setting the framerate lower than the source is likely to cause "choppy" video.
     
  6. NightStorm macrumors 68000

    Joined:
    Jan 26, 2006
    Location:
    Whitehouse, OH
    #6
    I have it from an "inside source" that Apple does not handle the majority of the encodes for the iTunes video store. I think you may know who my source is. :cool:
     

Share This Page