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video clip evaluation


David Landelle

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I have recorded a video clip in 25p with my MVR in 16/9 mode. Here is the result after blow-up in Windows Media : Test SDX800 25p (a 3GHz PC with 1280x1024 resolution is needed to view it correctly).

 

Do you think I should get a better result ?

 

Conditions where difficult, backfocus does not seem to be correct, and lighting...well, this is a test :)

 

Thank you for your opinion !

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  • 4 months later...

 

my appologies for the dead link, clips have moved on the new web http://www.lvideoservices.net/ and the first "uncompressed" rush named "MVR16b9at25p.m2v" is a rough edit of the original material (ingest of DVCPRO50 tape by the MVR). In multicam, up to 10 feeds may be captured in real time.

 

This is a "real-life" test with pedestal, shoulder & funny camera movements. Also shutter is sometimes not set to 1/25, as it should be to provide smooth motion blur.

 

I got only 704 pixels of signal, instead of 720, as it should be in SDI. Panasonic told me @ IBC last week that this was not normal.

 

I'm a programmer, not a video specialist :) and I'm interested in your opinion about "subjective" image quality (compression artifacts, chroma for keying...).

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I'm a programmer, not a video specialist :) and I'm interested in your opinion about "subjective" image quality (compression artifacts, chroma for keying...).

 

From watching the clips I think you would have a problem using them as a chroma key because it looks as though the camera sharpness was set way too high. There were a lot of edge enhancement artefacts in that footage.

 

You need to go into the menus or get an engineer to set it up for a much milder detail setting.

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From watching the clips I think you would have a problem using them as a chroma key because it looks as though the camera sharpness was set way too high. There were a lot of edge enhancement artefacts in that footage.

 

Thank you Simon.

 

You are right, the first test I did (not published) was using an HD lens, and the image was naturally sharp.

 

The rent company told me that the lens for the second test was not HD. I - stupidly - said well, I'm only shooting SD, no problem :rolleyes: they probably boosted the sharpness to try to recover that real problem. Even though, I did not get the image I saw the first time with a better lens. :(

 

Also, the MPEG2 encoder probably suffers from excessive sharpness, and adds it's own artifacts.

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