Archive for the ‘Vimeo’ Category

Vimeo Accepts 720p @ 23.976 fps

Monday, December 5th, 2011

I shot a one-minute movie (as a learning assignment on “Shooting People”) at 23.976 frames per second, and wondered whether Vimeo would accept this and play it properly – e.g. at same rate (not some blurry blend to 30 fps).

Vimeo Upload Formats

Monday, May 2nd, 2011
  • H264 Encoder Tips:
    • Some recommend the use of Handbrake (free encoder) over that in Sony Vegas 9 and earlier.
    • Sony Vegas 10 uses an updated version of the MainConcept encoder (for H264 etc.) than Vegas 9 etc.
      • I don’t know how this compares to Handbrake.
  • Levels: Studio/Broadcast, 0-235.
    • Any levels outside this range will be preserved by the encode/decode but will get clipped at 16=black and 235=white.
    • Levels within the range will play back in Vimeo at 0-255 RGB on computer display.
  • But what of gamma/colorspace?  601 or 709 or what?
  • Framerate:
    • 30fps (as in USA) or 25fps (as in Europe etc.).
      • For nicer motion, might be worth mo-comp retiming 25 fps to 30 fps?
  • Resolution:
    • 640×480 for standard definition
    • 4:3 video, 853×480 for widescreen DV
    • 1280×720 or 1920×1080 for high definition.
  • Pixel Aspect:
    • Square, i.e. 1:1″ or “1.00”
  • Interlacing:
    • None (Progressive)
  • Encoding
    • MP4-(H264+AAC).  Other formats also possible but this one is probably the most popular.
      • H264:
        • Use 2000 kbits/sec for standard definition 4:3 video, 3000 kbits/sec for widescreen DV, or 5000 kbits/sec for high definition footage.
        • Profile = Main ?
        • Reference frames = 2 (default)
          • Each macroblock (or part of it?) can be predicted from a different reference frame.  Result can be higher quality but increased encoding time – since each Ref. Frame implies its own motion estimation.  A default of 2 or 3 is about right.  Higher values tend only to be helpful for animations.  Values above 5 rarely help.
        • Deblocking filter = Yes ?
      • AAC: 320 kbps / 44.1 kHz
      •  If you give them non-streaming source, the upload servers must do an extra preliminary pass to find the metadata, taking up more time and resources than is necessary. This has a cumulative effect on overall server response.