FFDShow是一款DirectShow解码滤镜,可以解压缩包括DivX、XviD、WMV、MPEG -1和MPEG-2等在内的多种视频格式.滤镜同样还支持电影中所使用的几乎所有音频格式的解码,如AC3、DTS、MP3和Ogg Vorbis,以及诸多字幕格式.编解码器还提供后处理功能,支持几乎所有的MPEG-4视频格式,支持各种处理器提升(诸如SSE和MMX)等等. FFDShow是在GPL许可协议下作为一款开源软件发布的.

Notes about latest versions of FFDShow MPEG-4 Video Decoder :

- FFDShow 2007-04-14 (rev. 1099) was compiled by drevil_xxl using GCC 4.1.1 (libavcodec.dll & libmplayer.dll), FFDShow 2007-04-19 (rev. 1108) MMX* was compiled by clsid using ICL9 while FFDShow 2007-03-31 (rev. 1082) SSE** was also compiled by drevil_xxl using GCC 4.0.4.
* Only for CPUs with support for MMX (MultiMedia eXperience) instructions.
** Only for CPUs with support for SSE (Streaming SIMD Extensions) instructions. Check if your CPU has support for SSE or SSE2 instructions using Cpu-Z, a small tool which shows infos about CPU.

First of all, the FFDSHOW consumes way less CPU power than original DivX codecs, even with maximum post-processing. At the same time the post-processing seems to give excellent quality results and allows more configuring than the original DivX 5 codec. It can even automaticly reduce post-processing if your CPU is getting overloaded. The noise filter adds a kind of a rasterising effect to the picture - might be useful in some cases. The alpha version also includes experimental playback for MPEG-1 and MPEG-2 files (such as VCD and SVCD movies), which works pretty damn well. Only problem is that MPEG-2 playback can't play the SVCD clips directly from the CD, but requires the video to be extracted to the HDD by using VCDGear first.

Features of FFDShow MPEG-4 Video Decoder :

- various compression methods:
· MPEG 4 compatible (Xvid, DivX 4, DivX 5) using libavcodec or XviD
· Divx 3 compatible, MSMPEG4v2, MSMPEG4v1
· WMV1/7, WMV2/8
· H263, H263+, H264
· HuffYUV in YV12 colorspace
· MJPEG
· MPEG 1
· Theora (not for regular use, format isn't stabilized yet)
· MPEG 2 by using mpeg2enc code from MJPEGtools project
· all Windows Media Video 9 supported encoders with output to asf/wmv file or AVI
- all common encoding modes: constant bitrate, fixed quantizer, fixed quality, two pass encoding (depends on compressor features)
- for libavcodec and XviD detailed selection of motion estimation method
- minimum and maximum I frames interval
- minimum and maximum quantizer selection, quantizer type and trellis quantization selection for libavcodec
- adaptive quantization (aka. masking) for libavcodec and XviD, single coefficient elimination
- selectable compression of starting and ending credits
- two curve compression algorithms for second pass of two pass encoding - thanks to XviD developers
- second pass simulation: although not very precise, still helpful for tweaking advanced curve compression parameters
- ability to use libavcodec internal two pass code
- image preprocessing with ffdshow image filters (latest ffdshow version must be installed)
- graph during encoding: if your encoding program doesn't provide one
- B frames support: from one to eight consecutive B frames
- support for MPEG 4 quarterpel and GMC
- selectable interlaced encoding
- decompression

Changes from FFDShow rev. 1075 to FFDShow rev. 1097 :

- x264 rev 638
- onSizeChange was not called when only AR had changed.
This fixes playback of a file with AR change during playback, with resize on (Keep original aspect ratio).
- tiny code improvement
- Some ffmpeg updates
- Avisynth dialog: Save was not working on UNICODE builds.
- Updated install script
- SSA/ASS subtitle : shadow
- Debug support code
- Comment out some DPRINTF
- Compilation fix (Sorry, bad partial commit)
- Bug fix: The outline strength and radius sliders on the OSD font configuration page always get reset to 0 as opposed to reflecting the current settings.
- Winamp plugin fixes:
· fix reference count issues.
· Disable Winamp2 directory change during playback.
· Exclude DSP stacker plugin.
- Updated Russian translation (by Fizick).
- ffmpeg 8526,8531-8533
- tiny fix
- adjust bitstream buffer sizes for very large frames
- Add Haali's Video Renderer to reconnectable filters.
- Updated inno setup script
1. Add new compatible applications to the current settings and ask user to check.
2. Update msvcr80 to sp1.
3. MSVC8 builds: Drop support for NT4.0.
- AC3 encode option : added condition on codec Id (no format changes when codec Id is AC3 or DTS)
- Consistency fix in German IS translation.
- Fix AR change during playback.
- Use new method (just attach new format on the output sample) only for overlay mixer.


Download: FFDShow MPEG-4 Video Decoder 2007-04-14
Download: FFDShow MPEG-4 Video Decoder 2007-04-19 MMX
Download: FFDShow MPEG-4 Video Decoder 2007-03-31 SSE

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