Tom's Guide > Forum > Graphic & Displays > TV/Video Cards > Pixel noise at top edge of some frames - motion stills

Pixel noise at top edge of some frames - motion stills

Forum Graphic & Displays : TV/Video Cards - Pixel noise at top edge of some frames - motion stills

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I am creating a sequence of motion stills [JPEGs] in Premiere Pro 1.5
for export to lossless AVI to import into Encore DVD [which will
transcode them to MPEG 2 for DVD]. I'm using 720 x 480 res, 0.9 PAR,
HuffY codec. After exporting, I am consistently getting rainbow-colored
pixel noise at the very top or bottom edge of certain frames. It
happens, on average, maybe once every 3 to 4 seconds. It seems to occur
primarily during the cross-fade transisitons between photos or upon
fade in and fade outs. With some codecs, it is as small as a 1 or
2-pixel-high band spanning 80 or 100 pixels across. Other times,
especially with HuffY, it is an extremely noticable 12 to
24-pixel-high, multi-colored band spanning most or all of the width of
the frame. It seems to occur on only a single frame - does not carry
into consecutive frames. It happens regardless of playback app: Windows
Media Player or Premiere itself. I can even pause the player and scrub
to the exact frame and see the noise sitting there on the frame. And,
yes, the noise carries over to the DVD I create in Encore.

I have tried:

1. Every option there is in the Huffy codec.

2. All combinations of interlacing and progressive [LFF, UFF, No
Fields, Deinterlace].

3. Lossy formats like MPEG 4 [QuickTime], MPEG 2, Indeo, PIC MJPEG.

MPEG 4 played back in QuickTime did exhibit much less of the problem
but it was definitely still there - every 12 seconds on average, and
only 1 to 4 lines of noise.

The codecs above are irrelevant to this project, though, because I want
to stay in the lossless domain with my intermediary format between
Premiere and Encore. There's no sense exporting to a lossy format and
suffering 2 generations of loss rather than 1. That's why I'm using
HuffY.

4. Alternate still image formats in different RGB color spaces:
A. TIFF in Adobe RGB and sRGB colorspaces
B. PSD in Adobe RGB and sRGB colorspaces
C. no colorspace

5. Disabling "Optimize Stills"

6. Disabling the "Recompress" checkbox under "Data Rate" in Premiere's
export settings

7. Full uncompressed video - Specifying "None" as a codec.

Here's my hardward:

AMD Athon XP 3000+ [2.16 GHz] - nForce2 motherboard
nVidia 6800 GT 256MB video card
1.00 GB RAM
150 GB SATA HD
Windows XP SP2

Any help is immensely appreciated.

Thanks!
-russ brooks
North Wales, PA

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