GH3 vs Sony HDR-CX550V motion stutter test vid #1





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Published on Mar 23, 2013

!!! UPDATE !!

Extensive testing over the last three days has revealed that the problems with playback of many YT vids, including this one, are player-dependent. The tests were done on three different fast Windows 7 Pro systems (two with nVidia and one with Intel graphics), an iPad2, and a MacBook Pro 15" Late 2011. Also rendered the video to Blu-ray format at 25 Mbs (tried both 24p and 60i) and played back on Samsung 1080p big-screen TV.

The problems, when present, affect both the GH3 and CX550V portions of the video. This tells me that there is no inherent failure of the GH3 (whew).

* Firefox 19.02 exhibits extreme amounts of tearing, and also stutter
* . Chrome 25.0.1364.172, not nearly as much tearing, but still stuttering, just not as bad as Firefox. Marginally better in HTML5 mode
* iPad 2 using YouTube app, very smooth, zero tearing, only very occasional stutter
* VLC 2.0.5 Two Flower using network stream feature to play the video shows zero tearing, zero stutter
* Blu-ray playback on TV is perfect - also fabulously sharp on other GH3 source material)

So ..What the heck is going on? Does anyone have an explanation? I'm baffled... all suggestions welcome!

---- shooting and rendering configuration ----
GH3 was using the 35-100mm F.28 lens, O.I.S. off, manual focus. I just set both cams to full auto; was not worried about white balance or exposure.

This video was rendered using Sony Vegas 11. Used the Sony AVC/MVC H.264 output format (this is the one Vegas suggests is best for "highest quality 16:9 suitable for uploading to Internet Sites". The specific customization of the default template:
Audio: 128 Kbps, 48,000 Hz, 32 Bit, Stereo, AAC
Video: 29.970 fps, 1920x1080 Progressive, YUV, 24 Mbps
Pixel Aspect Ratio: 1.000

The Vegas project settings were HD 1080-60i (1920x1080, 29.970 fps) , Upper field first, Gaussian Motion Blur, Deinterlace method: Interpolate fields.

The resultant .mp4, when viewed on my computer with either VLC or Media Player Classic HC, is silky-smooth without a trace of tearing, stutter or jitter. The pendulum looks quite blurred at the fast point in the swing, but the blur is smooth and pleasing.

The Vimeo version is a 10Mbps version of the same video. And, the results are the same - less tearing when viewed with Chrome, but still stutters. Have a look:


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