what is source frame rate? Is it interlaced?

what is timeline frame rate? Is it interlaced?

what is export frame rate? Is it interlaced?

I ask because going from 24p to a 29.97 timeline will do 3:2 pullup. exporting back to 24p will do 3:2 pulldown.

but.... imagine you have frames ABCD. @29.97 that's ABCDD (ie D is frame doubled).

if you now downgrade to 24fps it throws away frames... but I know from use it's the wrong one so you get something like ABDD (ie C is dropped not D)

that can cause the jitter you see.

secondly, if you're using the H.264 exporter you need to change the Multiplexer to the iPad etc compatibility. This dumbs down the encode to make the H.264 a subset of the standard that QuickTime knows how to properly decode. Without it you get jittery playback.

hope that helps,

Jim Simon wrote:

 

Something's changed with Vimeo recently.  On a lot of their videos, I get no play controls, including yours.

 

I haven't figured out why yet.

yup, I only get a static image too.... no ability to run the video.

As to the root cause of jitter....

The iPod and QuickTime don't fully support the decoding of the H.264 spec. As such encoders have to dumb down the encoder by disabling features. The Mux'ing to iPod parameter on the CS5 "H.264" (now called "H.264 (legacy) in CS6) did the necessary changes to make it work.

The "iPad", on the other hand, has added some of the missing parts of the decoding of the H.264 standard so the "iPad" multiplexing option is no where near as restrictive on the encoding rules vs the "iPod" choice.

The technology that's missing will cause very jittery output if encoded with the technology but played back in QuickTime.

IF, and this is the speculation, Vimeo streams to users what you encoded (vs transcoding it again) then you're at the mercy of the H.264 decoder being used in your web browser. Commonly that's the Windows one unless you install QuickTime - in which case it changes to the QuickTime decoder. The latter is still broken and would explain why some people have a problem and others do not.

So, to test that theory I suggest you encode using the old iPod [compatible] Multiplexing option and see if it fixes it.

'regards,

Rallymax.

Message was edited by: Rallymax-forum I cleaned up the meaning of some sentences.

3l3ctricdr3ams wrote:

 

Hi Ann, thanks for your help.  If you don't mind, here is one more link we have had some complaints about: https://vimeo.com/40555146

 

What I'm confused about is that the video plays differently on different devices (might be the browser, not the device tho).  It plays smooth on my iMac, but not my older-version macbook and iPad, for example.  Is this enough to isolate it as a codec issue?

Plays back fine for me but looks blurry - not out of focus blurry, just blurry like it's had a soft filter put over it.