High bit-depth Support with Avisynth
m |
(start of major overhaul) |
||
| Line 1: | Line 1: | ||
| + | == Introduction == | ||
Currently, Avisynth only supports 8-bit video. Nevertheless, through various utilities, plugins, and scripts, Avisynth can be used to import, process, and export high bit-depth video. There has been some effort to update Avisynth itself to support high bit-depth, but there has been no progress as of 2012 (http://forum.doom9.org/showthread.php?t=162436). | Currently, Avisynth only supports 8-bit video. Nevertheless, through various utilities, plugins, and scripts, Avisynth can be used to import, process, and export high bit-depth video. There has been some effort to update Avisynth itself to support high bit-depth, but there has been no progress as of 2012 (http://forum.doom9.org/showthread.php?t=162436). | ||
| − | + | == What is deepcolor? == | |
Deepcolor refers to using more than 8 bits of data to represent each color channel. It is also referred to as high bit-depth color. Basically, deepcolor/high bit-depth allows finer graduations of color, allowing smoother gradients and more detail. Please refer to this short, easy to understand article: http://www.pcworld.com/article/171223/what_is_10bit_color.html | Deepcolor refers to using more than 8 bits of data to represent each color channel. It is also referred to as high bit-depth color. Basically, deepcolor/high bit-depth allows finer graduations of color, allowing smoother gradients and more detail. Please refer to this short, easy to understand article: http://www.pcworld.com/article/171223/what_is_10bit_color.html | ||
| − | + | == Why Use Deepcolor? == | |
-Higher internal precision, using high-bit depth color, when processing an image in a filter, gives a higher quality (8-bit) output | -Higher internal precision, using high-bit depth color, when processing an image in a filter, gives a higher quality (8-bit) output | ||
| Line 25: | Line 26: | ||
| − | + | == Importing High Bit-depth Video into Avisynth == | |
Patched ffms2/ffms2-ffmbc - http://forum.doom9.org/showthread.php?p=1580141#post1580141 (See SAPikachu's signature for downloading) Can import DNxHD, ProRes, or other 10 bit videos in their native chroma format (4:2:2 and 4:4:4 are also supported), outputting in the Avisynth high bit-depth convention. Uses Avisynth 2.6's new colorspace. You can process with the full quality of the format. | Patched ffms2/ffms2-ffmbc - http://forum.doom9.org/showthread.php?p=1580141#post1580141 (See SAPikachu's signature for downloading) Can import DNxHD, ProRes, or other 10 bit videos in their native chroma format (4:2:2 and 4:4:4 are also supported), outputting in the Avisynth high bit-depth convention. Uses Avisynth 2.6's new colorspace. You can process with the full quality of the format. | ||
| Line 49: | Line 50: | ||
| − | + | == Processing High Bit-depth Video with Avisynth == | |
Some plugins support processing internally in a higher bit-depth for better quality and return an 8-bit video. Others support full high-bit processing and can retun a special format 16 bit video. | Some plugins support processing internally in a higher bit-depth for better quality and return an 8-bit video. Others support full high-bit processing and can retun a special format 16 bit video. | ||
| − | Most developers have adopted a vertically stacked format, where the high bits are stored in the upper half of a video, and the lower bits in the lower half of the video. | + | Most developers have adopted a vertically stacked format known as [[Stack16]], where the high bits (MSB) are stored in the upper half of a video, and the lower bits (LSB) in the lower half of the video.<br> |
| + | This special format must be processed only with high-bit aware scripts and plugins.<br> | ||
| + | <br> | ||
| + | *'''[http://forum.doom9.org/showthread.php?t=163018 RedAverage]''' - 16-bit capable average with masking. | ||
| − | + | *'''[http://forum.doom9.org/showpost.php?p=1386559 Dither]''' - A set of scripts, original and modified plugins to process 16-bit clips in the native 8-bit Avisynth environment. | |
| − | + | *'''[http://svn.int64.org/viewvc/int64/resamplehq/doc/index.html ResampleHQ]''' - Provides gamma-aware resizing and color space conversion. Uses 32-bit linear color internally but input and output is limited to 8-bit | |
| − | + | *'''[http://forum.doom9.org/showthread.php?t=167573 AutoAdjust]''' - A high quality automatic color adjustment filter. AutoAdjust can input and output 16-bits; all calculations are internally done in 32-bit float to avoid rounding errors and artifacts. | |
| − | + | *'''[http://forum.doom9.org/showthread.php?t=154971 SmoothAdjust]''' - High quality YUV color adjustment plugin. SmoothAdjust can input and output 16-bits; all calculations are internally done in 32-bit float to avoid rounding errors and artifacts. | |
| − | + | ||
| − | + | ||
Deep Color Tools - http://forum.doom9.org/showthread.php?p=1467907#post1467907 - This Script provides basic functions to import 10bit video, do color adjustments, and export to 8bit | Deep Color Tools - http://forum.doom9.org/showthread.php?p=1467907#post1467907 - This Script provides basic functions to import 10bit video, do color adjustments, and export to 8bit | ||
| − | flash3kyuu_deband - | + | *'''[http://forum.doom9.org/showthread.php?t=161411 flash3kyuu_deband]''' - Another debanding filter for avisynth - https://github.com/SAPikachu/flash3kyuu_deband#readme Dither 10bit to 8bit: |
ReadV210(...) | ReadV210(...) | ||
f3kdb(precision_mode=3,input_mode=1,input_depth=16) | f3kdb(precision_mode=3,input_mode=1,input_depth=16) | ||
| Line 78: | Line 80: | ||
| − | + | == Codecs which support high bit-depth == | |
-H.264, High 10 Profile (Hi10P) and above https://en.wikipedia.org/wiki/H.264 | -H.264, High 10 Profile (Hi10P) and above https://en.wikipedia.org/wiki/H.264 | ||
| Line 91: | Line 93: | ||
| − | + | == Exporting High Bit-depth Video == | |
You can encode out of AVIsynth to 10bit x264 via | You can encode out of AVIsynth to 10bit x264 via | ||
| Line 112: | Line 114: | ||
| − | + | == Playback of High Bit-depth Videos == | |
| − | -Most of the time you will only get to see dithered 8-bit video, as equipment to truly display high bit-depths is rare at the consumer level in 2011. Digital | + | -Most of the time you will only get to see dithered 8-bit video, as equipment to truly display high bit-depths is rare at the consumer level in 2011. Digital theaters project up to 12-bit video. Guide: http://coalgirls.wakku.to/?page_id=4635 |
-The Bluray standard does not support xvColor (using full-range 8 bit video) or high bit-depth video. | -The Bluray standard does not support xvColor (using full-range 8 bit video) or high bit-depth video. | ||
| Line 134: | Line 136: | ||
An excellent guide on 10-bit playback: http://haruhichan.com/wpblog/?p=205 | An excellent guide on 10-bit playback: http://haruhichan.com/wpblog/?p=205 | ||
| − | + | == Sample High Bit-Depth Videos == | |
See this thread for links to examples. There are also deepcolor versions of standard test clips (used in image processing research). http://forum.doom9.org/showthread.php?t=158836&highlight=v210 | See this thread for links to examples. There are also deepcolor versions of standard test clips (used in image processing research). http://forum.doom9.org/showthread.php?t=158836&highlight=v210 | ||
[[Category:Advanced topics]] | [[Category:Advanced topics]] | ||
Revision as of 19:01, 2 June 2014
Contents |
Introduction
Currently, Avisynth only supports 8-bit video. Nevertheless, through various utilities, plugins, and scripts, Avisynth can be used to import, process, and export high bit-depth video. There has been some effort to update Avisynth itself to support high bit-depth, but there has been no progress as of 2012 (http://forum.doom9.org/showthread.php?t=162436).
What is deepcolor?
Deepcolor refers to using more than 8 bits of data to represent each color channel. It is also referred to as high bit-depth color. Basically, deepcolor/high bit-depth allows finer graduations of color, allowing smoother gradients and more detail. Please refer to this short, easy to understand article: http://www.pcworld.com/article/171223/what_is_10bit_color.html
Why Use Deepcolor?
-Higher internal precision, using high-bit depth color, when processing an image in a filter, gives a higher quality (8-bit) output
-If a video filter uses linear gamma internally, there can be noticeable differences in the image. A linear gamma representation is best supported with a high bit-depth. See the illustration for ResampleHQ, http://int64.org/projects/resamplehq/
-If you encode high-bit depth video, you can get better compression (reportedly up to 30%) and less banding. Banding is one of the most serious liabilities of 8-bit depth. Refer to the following references for an explanation of why 10-bit encodes compress better:
http://x264.nl/x264/10bit_02-ateme-why_does_10bit_save_bandwidth.pdf
http://x264.nl/x264/10bit_01-ateme_pierre_larbier_422_10-bit.pdf
http://x264.nl/x264/10bit_03-422_10_bit_pristine_video_quality.pdf
-Professional video is stored in 10bit formats (like ProRes 422) and people want to use Avisynth for processing.
Importing High Bit-depth Video into Avisynth
Patched ffms2/ffms2-ffmbc - http://forum.doom9.org/showthread.php?p=1580141#post1580141 (See SAPikachu's signature for downloading) Can import DNxHD, ProRes, or other 10 bit videos in their native chroma format (4:2:2 and 4:4:4 are also supported), outputting in the Avisynth high bit-depth convention. Uses Avisynth 2.6's new colorspace. You can process with the full quality of the format.
Note:
- There may be a long delay on opening, as FFMS2 performs an automatic indexing operation.
- At the time of writing (1-8-2012), the official libav library has a bug with decoding of DNxHD video, so you should use the ffmbc build to decode that. Other than that, both builds should be OK, but ffmbc may have better support for professional video formats (ProRes etc.), and libav is better for H264 and other common formats.
The following methods are obsoleted now, except as a verification or workaround:
Readv210mod - http://forum.doom9.org/showthread.php?p=1526131#post1526131 Can read uncompressed v210 in .mov container as color. Needs a manual setting skip the file header.
Sashimi - http://sites.google.com/site/ourenthusiasmsasham/soft - Sashimi 0.85 has different bit-depth support. Please see OtherFormats/Read_v210.avs included in the package.
ReadV210 - http://forum.doom9.org/archive/index.php/t-158985.html Can read uncompressed v210 in .mov container as greyscale.
Alternative builds and methods of importing:
ffms2mod - http://forum.doom9.org/showthread.php?p=1528494 Can return most 10bit video in the Avisynth high bit-depth convention.
rawsource with ffmpeg - http://forum.doom9.org/showthread.php?t=162598&page=2 - shows an example of using ffmpeg to convert to a 16bit format which can be read by rawsource in Avisynth 2.6.
Processing High Bit-depth Video with Avisynth
Some plugins support processing internally in a higher bit-depth for better quality and return an 8-bit video. Others support full high-bit processing and can retun a special format 16 bit video.
Most developers have adopted a vertically stacked format known as Stack16, where the high bits (MSB) are stored in the upper half of a video, and the lower bits (LSB) in the lower half of the video.
This special format must be processed only with high-bit aware scripts and plugins.
- RedAverage - 16-bit capable average with masking.
- Dither - A set of scripts, original and modified plugins to process 16-bit clips in the native 8-bit Avisynth environment.
- ResampleHQ - Provides gamma-aware resizing and color space conversion. Uses 32-bit linear color internally but input and output is limited to 8-bit
- AutoAdjust - A high quality automatic color adjustment filter. AutoAdjust can input and output 16-bits; all calculations are internally done in 32-bit float to avoid rounding errors and artifacts.
- SmoothAdjust - High quality YUV color adjustment plugin. SmoothAdjust can input and output 16-bits; all calculations are internally done in 32-bit float to avoid rounding errors and artifacts.
Deep Color Tools - http://forum.doom9.org/showthread.php?p=1467907#post1467907 - This Script provides basic functions to import 10bit video, do color adjustments, and export to 8bit
- flash3kyuu_deband - Another debanding filter for avisynth - https://github.com/SAPikachu/flash3kyuu_deband#readme Dither 10bit to 8bit:
ReadV210(...) f3kdb(precision_mode=3,input_mode=1,input_depth=16)
8/16 bit denoise - deepcolor denoise - http://forum.doom9.org/showthread.php?t=162342
You can also check http://avisynth.org/mediawiki/External_filters#Deepcolor_Filters for possibly more listings.
8bit Video to 16bit Scene Referred Linear guide http://blendervse.wordpress.com/2011/09/16/8bit-video-to-16bit-scene-referred-linear-exrs/
Codecs which support high bit-depth
-H.264, High 10 Profile (Hi10P) and above https://en.wikipedia.org/wiki/H.264
-ProRes 422 https://en.wikipedia.org/wiki/ProRes
-DNxHD https://en.wikipedia.org/wiki/DNxHD also supported by ffmbc https://code.google.com/p/ffmbc/
-Apple Animation https://en.wikipedia.org/wiki/Animation_codec
https://en.wikipedia.org/wiki/Digital_cinematography#Digital_acquisition_codecs_compared
Exporting High Bit-depth Video
You can encode out of AVIsynth to 10bit x264 via
AVS4x264 https://astrataro.wordpress.com/2012/06/04/avs4x264mod-v0-8-0-supports-d2v-dgi-dga-avi-mkv-mp4-m2ts-wmv-input-and-auto-fps-correction/ This command-line tool will directly convert from a high bit-depth convention Avisynth script to H.264 with x264, including the 10bit profile. Please check the blog for updated versions.
x264+tmod https://astrataro.wordpress.com/2012/07/21/x264-rev2208677-tmod/ tmod is a modification to the x264 encoder to enable various enhancements, especially for the use of high-bit depth input. Supports the Avisynth high bit-depth convention, quality enhancements, bit-depth conversion, filters such as denoising and deinterlacing
10bit x264 command-line example:
avs2yuv -raw "script.avs" -o - | x264-10bit --demuxer raw --input-depth 10 --input-res 1280x720 --fps 24 --output "out.mp4" -
AVS2yuv (http://akuvian.org/src/avisynth/avs2yuv/)
AVS2pipemod (https://github.com/chikuzen/avs2pipemod#readme). The Dither html doc with the plugin gives examples of using AVS2yuv including lossless 10bit.
AVS2x264mod http://forum.doom9.org/showthread.php?p=1529305#post1529305 Example:
avs4x264mod.exe --x264-binary “C:\x264_64-abc.exe” -o out.264 in.avs
Playback of High Bit-depth Videos
-Most of the time you will only get to see dithered 8-bit video, as equipment to truly display high bit-depths is rare at the consumer level in 2011. Digital theaters project up to 12-bit video. Guide: http://coalgirls.wakku.to/?page_id=4635
-The Bluray standard does not support xvColor (using full-range 8 bit video) or high bit-depth video.
Playback Software
MPlayer with high-bit codecs installed, such as http://samples.mplayerhq.hu/drivers32/new/AppleProResDecoder.qtx ProRES 422
MadVR http://forum.doom9.org/showthread.php?t=146228
Other sofware and information
Further information on high-bit playback http://forum.doom9.org/showthread.php?t=161548
FFdshow builds with 10-bit support http://forum.doom9.org/showthread.php?t=161915
An excellent guide on 10-bit playback: http://haruhichan.com/wpblog/?p=205
Sample High Bit-Depth Videos
See this thread for links to examples. There are also deepcolor versions of standard test clips (used in image processing research). http://forum.doom9.org/showthread.php?t=158836&highlight=v210
