High bit-depth Support with Avisynth
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== Importing High Bit-depth Video into Avisynth == | == Importing High Bit-depth Video into Avisynth == | ||
| − | + | *'''[http://forum.doom9.org/showthread.php?p=1580141#post1580141 Patched ffms2]''' - (See SAPikachu's signature for downloading the latest verions) | |
| + | :Can import DNxHD, ProRes, or other 10 bit videos in their native chroma format (4:2:2 and 4:4:4 are also supported), output will always be in the [[Stack16]] format. | ||
| − | Note: | + | ::Note: |
| − | # There may be a long delay on opening, as FFMS2 performs an automatic indexing operation. | + | ::# [http://forum.doom9.org/showthread.php?t=168764 AviSynth 2.6.0 Alpha5] or later is recommended. |
| − | # 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. | + | ::# 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. | ||
| + | <br> | ||
| + | *'''[[LSMASHSource]]''' - Another source filter to import regular 8-bit and high bit depth video. | ||
| + | ::LSMASHSource includes these 2 fuctions to import video: | ||
| + | :::[[LSMASHSource/LSMASHVideoSource|LSMASHVideoSource]] - This function uses [http://en.wikipedia.org/wiki/Libavcodec#Implemented_video_codecs libavcodec] as a video decoder and [http://github.com/l-smash/l-smash L-SMASH] as a demuxer. Recommended for MP4, MOV, [http://en.wikipedia.org/wiki/ISO_base_media_file_format ISO Base Media] and its derived file formats. | ||
| + | :::[[LSMASHSource/LWLibavVideoSource|LWLibavVideoSource]] - This function uses [http://en.wikipedia.org/wiki/Libavcodec#Implemented_video_codecs libavcodec] as a video decoder and [http://www.ffmpeg.org/libavformat.html libavformat] as a demuxer. | ||
| + | <br> | ||
| + | *'''[[VapourSource]]''' - Can be used to import [http://www.vapoursynth.com/ VapourSynth] scripts into Avisynth. Video can be 8-bit or greater. | ||
| + | <br> | ||
| + | ---------------------------------------------- | ||
| + | '''The following methods are obsolete! If you must, only use as a verification or as workaround:'''<br> | ||
| + | :[http://forum.doom9.org/showthread.php?p=1526131#post1526131 Readv210mod] - Can read uncompressed v210 in .mov container as color. Needs a manual setting skip the file header. | ||
| − | + | :[http://sites.google.com/site/ourenthusiasmsasham/soft Sashimi] - Sashimi 0.85 has different bit-depth support. Please see OtherFormats/Read_v210.avs included in the package. | |
| − | + | :[http://forum.doom9.org/showthread.php?t=158985 ReadV210] - Can read uncompressed v210 in .mov container as greyscale. | |
| + | <br> | ||
| + | :Alternative builds and methods of importing '''(also obsolete)''': | ||
| − | + | ::[http://forum.doom9.org/showthread.php?p=1528494 ffms2mod] - Can return most 10bit video in the Avisynth high bit-depth convention. | |
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| + | ::[http://forum.doom9.org/showthread.php?t=162598&page=2 RawSource with ffmpeg] - 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 == | == Processing High Bit-depth Video with Avisynth == | ||
Revision as of 22:37, 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 - (See SAPikachu's signature for downloading the latest verions)
- Can import DNxHD, ProRes, or other 10 bit videos in their native chroma format (4:2:2 and 4:4:4 are also supported), output will always be in the Stack16 format.
- Note:
- AviSynth 2.6.0 Alpha5 or later is recommended.
- 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.
- Note:
- LSMASHSource - Another source filter to import regular 8-bit and high bit depth video.
- LSMASHSource includes these 2 fuctions to import video:
- LSMASHVideoSource - This function uses libavcodec as a video decoder and L-SMASH as a demuxer. Recommended for MP4, MOV, ISO Base Media and its derived file formats.
- LWLibavVideoSource - This function uses libavcodec as a video decoder and libavformat as a demuxer.
- LSMASHSource includes these 2 fuctions to import video:
- VapourSource - Can be used to import VapourSynth scripts into Avisynth. Video can be 8-bit or greater.
The following methods are obsolete! If you must, only use as a verification or as workaround:
- Readv210mod - Can read uncompressed v210 in .mov container as color. Needs a manual setting skip the file header.
- Sashimi - Sashimi 0.85 has different bit-depth support. Please see OtherFormats/Read_v210.avs included in the package.
- ReadV210 - Can read uncompressed v210 in .mov container as greyscale.
- Alternative builds and methods of importing (also obsolete):
- ffms2mod - Can return most 10bit video in the Avisynth high bit-depth convention.
- RawSource with ffmpeg - 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.
- 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.
- AvgAll_16 - Average all frames in a clip with 16-bit accuracy.
- CLExpr - OpenCl plugin for runtime calculation of expressions on 8 and 16-bit depths clips. Makes mt_lutxy and mt_lutxyz possible on 16-bit.
- ClipBlend16 - Blend an specified amount of frames into a single frame with 16-bit accuracy.
- Debilinear - This filter is designed to reverse the effects of bilinear upsampling. 8/16-bit input and output.
- Deep Color Tools - This Script provides basic functions to import 10bit video, do color adjustments, and export to 8bit. (NOT RECOMMENDED, THERE ARE BETTER ALTERNATIVES)
- DenoiseMD - 8/16-bit denoise.
- Dither - A set of scripts, original and modified plugins to process 16-bit clips in the native 8-bit Avisynth environment.
- flash3kyuu_deband - Debanding filter with 8/16 bit input/output. In addition flash3kyuu_deband can be used to dither 16-bit to lower bit depths.
- HQDeringMod - Deringing script with 16-bit input and output.
- RedAverage - 16-bit capable average with masking.
- ResampleHQ - Provides gamma-aware resizing and color space conversion. Uses 32-bit linear color internally but input and output is limited to 8-bit.
- Resizers Functions Pack - Includes LinearResize(), a function to resize in linear space. 8/16-bit input/output.
- SMDegrainMod - 8/16 bit denoising with additional features like sharpening.
- 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.
- TempLinearApproximate - 8/16 bit filter for temporal linear approximation between pixels . Meant mainly for denoising aid in motion compensated clips.
You can also check DeepColor Filters section for possibly more listings.
8-bit video to 16-bit Scene Referred Linear .EXR’s
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
