• John 2 months ago
    Problem: 720x480 MP4 is streamed as 512 x 336 FLV

    Premiere Pro CS3
    Windows XP SP2
    Media: miniDV tape captured as 720x480 AVI file.

    Using Premiere Pro CS3, I capture a miniDV tape as a 720x480 AVI file. I then convert it to a MP4 file. GSpot says the MP4 is 720x480. I upload to the MP4 to Vimeo.

    When I play it back on the Vimeo web page using full screen with "scaling is off", the size is not 720x480, but ~450x336. According to the FAQ, the "scaling is off" should display the resolution of the MP4. Of course, the matter is complicated because your MP4 is converted to a Flash FLV file. So what you are viewing is a streaming FLV file. I used GSpot to examine the FLV file that is streamed. GSpot says the FLV has resolution 512 x 336. It is unclear why the FLV file is not 720x480.

    How does one make your 720x480 MP4 display on Vimeo as 720x480?
    Why isn't the FLV file 720x480?
  • Eugenia Loli-Queru 2 months ago
    You can't do that. All online video services that do SD video are all re-encoding to another predefined resolution, not to the source resolution. If you want 1:1 re-encoding then you have to shoot in HD.
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  • John 2 months ago
    Is the re-encoding predefined resolution always 512x336 for both 720x480 and 640x480 sources? (GSpot said the FLV file has resolution 512x336 for the 720x480 source.)

    Since it is re-encoded to FLV, why does it change the resolution since FLV supports any resolution?

    Thank you for the feedback.
  • Eugenia Loli-Queru 2 months ago
    Because just like youtube and other services, Vimeo resizes to the same resolution each time to save bandwidth and page design. Only the HD resolutions resized to 1280x720, all others are resized to 504 by whatever.
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