Codec For Yv12

Sep 30, 2015  Download Helix YUV Codecs 1.3 : Helix YUV Codecs is a collection of tools which allow you to decompress and play I420 and YV12 AVI files.

FAQ YV12. From Avisynth wiki. Jump to: navigation, search Are there any lossless YV12 codecs, which I can use for capturing for example.

Main Page General Info Loading clips Loading Scripts Common Error Messages Processing Different Content Dealing with YV12 Processing with Virtualdub Plugins

These are several different ways to represent colors. For example: YUV and RGB colorspace. In YUV colorspace there is one component that represent lightness luma and two other components that represent color chroma. As long as the luma is conveyed with full detail, detail in the chroma components can be reduced by subsampling filtering, or averaging which can be done in several ways thus there are multiple formats for storing a picture in YUV colorspace. YV12 is such a format where chroma is shared in every 2x2 pixel block that is supported by AviSynth. Many important codecs stored the video in YV12: MPEG-4 x264, XviD, DivX and many others, MPEG-2 on DVDs, MPEG-1 and MJPEG.

The subsampling used by YV12 is also called 4:2:0 compared to 4:2:2 which is used by YUY2 and UYVY.

Where can I download the latest stable AviSynth version which supports YV12.

AviSynth v2.57 and more recent versions can be downloaded here.

Where can I download the DGIndex/DGDecode plugin, which supports YV12, to import MPEG-1/MPEG-2/TS/PVA in AviSynth.

The latest DGIndex/DGDecode combo can be downloaded here.

Which encoding programs support YV12.

The regular builds of Virtualdub by Avery Lee have YV12 support in fast recompress mode since v1.5.6. There are also two another options for encoding to DivX/XviD:

There is a modified version called VirtualdubMod which has YV12 support: This modification by pulco-citron, Suiryc and Belgabor has OGM and AVS-preview support. It can be downloaded here. In order to use the YV12 support without doing any color conversions you have to load your AVI in VirtualdubMod and select fast recompress.

For easy and fast YV12 support, you can also try out the command line utility AVS2AVI - compresses video from an AviSynth script using any VFW codec, see also here.

The MPEG-1/MPEG-2 encoders HC and QuEnc also support and even require YV12.

How do I use v2.5x if the encoding programs can t handle YV12 like TMPGEnc or CCE SP.

Using TMPGEnc you have to add the line ConvertToRGB24 with proper interlaced option to your script, and for CCE SP you need to add the line ConvertToYUY2 to your script, since Windows has no internal YV12 compressor.

You can also install some YV12 decompressor codec which will decompress the YV12-AVI for you when loading the avi in TMPGEnc or CCE SP.

What will be the main advantages of processing in YV12.

That depends entirely on the external plugins whether they will have YV12 support or not. Speed increases like 25-35 percent are expected. Of course there will only be a large speed increase if both your source and target are in YV12, for example in DVD to DivX/Xvid conversions.

The colour information doesn t get interpolated so often and thus stays more realistic.

MPEG-2 encoders such as CCE, Procoder and TMPGEnc can t handle YV12 input directly. CCE and Procoder needs YUY2, and TMPGEnc RGB24. This only means that the last line of AviSynth must be a ConvertToYUY2 for CCE/Procoder, or ConvertToRGB24 for TMPGEnc call, and that you will not be able to take full advantage of YV12 colorspace. Still there are two advantages:

All internal filtering in AviSynth will be faster though less data to filter, better structure to filter, and a very fast conversion from YV12 to YUY2, and you will definitely be able to tell the difference between v2.06 and v2.5.

If you are making a progressive clip there is another advantage. Putting off the YV12- YUY2 conversion until the end of the script allows you to first IVTC or Deinterlace to create progressive frames. But the YV12 to YUY2 conversion for progressive frames maintains more chroma detail than it does for interlaced or field-based frames.

How do I use VirtualDub/VirtualDubMod such that there are no unnecessary color conversions.

Just load your avs file in VirtualDub/VirtualdubMod and set the video on Fast recompress. In this mode the process will stay in YV12 all the necessary filtering has to be done in AviSynth itself. Under compression select a codec which support YV12, like Xvid, DivX5, RealVideo provided you download the lastest binaries or 3ivx D4 provided you download the lastest binaries. Note that DivX3/4 also supports YV12, except that PIV users could experience crashes when encoding to DivX4 in YV12.

If you want to preview the video you also need a YV12 decompressor.

Which internal filters support YV12.

In principal all internal filters support YV12 natively. Which color formats the filters support is specified in the documentation.

Which external plugins support YV12.

The plugins which are compiled for AviSynth v2.5 are given in External plugins. New plugins are listed in this sticky. Most of them support YV12 see documentation.

Are there any disadvantages of processing in YV12.

There is a degradation of color information in YV12, which is often acceptable, but not for high quality processing and interlaced material, where it is better to use YUY2 which is less subsampled.

If source format is not YV12 analog capture, DV or final encoding format is not YV12, then color format conversion will results in chroma interpolation with some quality decreasing.

Filtering of subsampled chroma can result in some chroma broadening relatively luminocity pixels, especially for interlaced video.

Because the chroma in interlaced YV12 video occurs on alternating lines, it is necessary to use a different upsampling/downsampling method when converting between YV12 and YUV 4:2:2 or RGB. This can lead to chroma upsampling/downsampling errors if the wrong color space conversion method is used on the video.

If YV12 video is stored in an AVI container, there is no metadata to indicate whether the video is interlaced or progressive. This means that an application or component doing color space conversion has no easy way of choosing the correct conversion method interlaced or progressive. Most color space converters assume progressive which can lead to chroma upsampling/downsampling errors when interlaced video is processed in such an environment.

How do I know which colorspace I m using at a given place in my script.

To see which colorspace you are using at a given place in your script, add:

and AviSynth will give you much information about colorspace amongst other things.

Colors are swapped when I load a DivX file in AviSynth v2.5.

This happens due to a bug in old versions of DivX5. Download the latest binaries or use SwapUV clip.

I installed AviSynth v2.5 and get the following error message: Couldn t locate decompressor for format YV12 unknown. .

Install a codec which supports YV12. DivX5 or one of the recent XviD or

or some other ffvfw, ffdshow. If that still doesn t work, modify your

registry as explained in the next question.

I installed AviSynth v2.5 and DivX5 or one of the latest Xvid builds of Koepi, all I got is a black screen when opening my avs in VirtualDub/VirtualDubMod/MPEG-2 encoder.

Ok, apparently your video is not decompressed by DivX 5.02 or XviD. Try to use VCSwap utility for hot swapping video codecs.

Advanced user can also do it by hand. Go to your windows-dir and rename a file called MSYUV.DLL, or add the following to your registry file:

HKEY_LOCAL_MACHINE SOFTWARE Microsoft Windows NT CurrentVersion Drivers32

Replace divx.dll by xvid.dll for xvid v0.9 or xvidvfw.dll for xvid v1.0.

Are there any lossless YV12 codecs, which I can use for capturing for example.

Capturing in YV12 is not recommended due to issues of interlacing and chroma; YUY2 will generally pose fewer problems. A lossless YV12 codec is more useful for saving intermediate files before a multi-pass encode, to avoid having to run a CPU-intensive script several times. There are several lossless YV12 codecs:

Main Page General Info Loading clips Loading Scripts Common Error Messages Processing Different Content Dealing with YV12 Processing with Virtualdub Plugins.

Yv12 quicktime codec free download - Apple QuickTime, YV12 QuickTime Codec, AllPlayer, and many more programs.

FAQ YV12

Download, install or update YV12 QuickTime Codec Mac - For developers working in image processing - from MacUpdate.

YV12 QuickTime Codec The YV12 QuickTime Codec consists of an image decompressor component, an image compressor component, a movie importer.

Jan 02, 2008  Download YV12 QuickTime Codec 1.0 : YV12 QuickTime Codec is designed for experts performing image processing or developing compression software.

YV12 is not a codec as such, it is a pixelformat. It seems you do not have any drivers installed supporting this pixelformat. See: YV12.