JpegSource

Revision as of 23:40, 20 April 2014

Description

An advanced JPEG decoder for AviSynth 2.6 which decodes JPEGs in its native colorspace. In addition, JpegSource does a

reconstruction pass on the data during the decoding stage. This process can accurately suppress common JPEG artifacts

(blocking, ringing/mosquito noise, etc). The reconstruction pass is harmless on high quality JPEGs but can produce

excellent results on highly compressed JPEGs. This technique yields better results than other post-processing methods.

Supported Formats

JpegSource supports just about every kind of JPEG file, but due to lack of colorspace support in AviSynth some formats need additional

steps to load:

• YUV440 JPEGs - channels have to be loaded individually.
• CMYK/YCCK JPEGs - channels have to be loaded individually.
• RGB encoded JPEGs - to load correctly see the examples below.

Requirements:

- AviSynth 2.6.0 Alpha5 or later

- Supported color formats: Y8, YV12, YV16, YV24, YV411

- SSSE3 capable CPU

Syntax and Parameters

JpegSource (string file, int "rec", int "channel", int "length", float "fps_num", int "fps_den")

string  file =

Path to image file. Path can be omitted if the script is in the same folder as the image file.

int  rec = 1

Number of reconstruction passes.

int  channel = -1

Load only one image channel with specified index (zero based).

-1 : load all channels

0 : load 1st channel

1 : load 2nd channel

2 : load 3rd channel

3 : load 4th channel (only for CMYK/YCCK JPEGs)

int  length = 1000

Clip length in frames.

float  fps_num = 24

FPS numerator.

int  fps_den = 1

FPS denominator.

Examples

JpegSource with default settings:

JpegSource("image.jpg", rec=1, channel=-1, length=1000, fps_num=24, fps_den=1)

Correctly display an RGB encoded JPEG:

JpegSource("RGBimage.jpg")
MergeRGB(last, UToY8(), VToY8(), "RGB24")

Changelog

Version        Date            Changes

2014.4.19      04/19/2010      - Added single-channel mode, so you can load pretty much every JPEG you can encounter even when 
                                 Avisynth doesn't have an appropriate colorspace.

2014.4.18      04/18/2014      - Support JPEGs with arithmetic compression.
                               - No longer locks files after first frame was decoded.
                               - Added MT and cache hints for AviSynth+.
                               - Changed compiler to VS2013.

2014.1.5       01/05/2014      - Initial release

External Links

• Doom9 Forum - JpegSource discussion.

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