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119 lines
3.9 KiB
Plaintext
119 lines
3.9 KiB
Plaintext
============================
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Win32 codecs importing HOWTO
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============================
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This document describes how to extract the information necessary to hook
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up Win32 binary codecs in MPlayer from a Windows system. Different methods
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exist depending on which video API your codec uses and which Windows
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version you have.
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If you have gathered all the necessary information (fourcc, GUID, codec file,
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sample file) as described below, notify the mplayer-dev-eng mailing list.
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If you want to add a codec yourself, read DOCS/tech/codecs.conf.txt.
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VfW codecs
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~~~~~~~~~~
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VfW (Video for Windows) is the old video API for Windows. Its codecs have
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the '.dll' or (rarely) '.drv' extension. If MPlayer fails at playing your
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AVI with this kind of message:
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VIDEO: [HFYU] 352x288 24bpp 25.000 fps 4321.0 kbps (527.5 kbyte/s)
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Cannot find codec matching selected -vo and video format 0x55594648.
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It means your AVI is encoded with a codec which has the HFYU fourcc (HFYU =
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HuffYUV codec, DIV3 = DivX Low Motion, etc.). Now that you know this, you
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have to find out which DLL Windows loads in order to play this file.
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You can find the VfW codec by searching the internet for e.g. VIDC.HFYU.
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In our case, the 'system.ini' also contains this information in a line that reads:
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VIDC.HFYU=huffyuv.dll
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So you need the 'huffyuv.dll' file.
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ACM Codecs:
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~~~~~~~~~~~~
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MPlayer may fail at playing the audio in your file with this message:
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Cannot find codec for audio format 0x55.
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Audio: no sound
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MPlayer calls this the TwoCC format identifier. From the TwoCC list we find:
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0x0055 MPEG-1 Layer 3 (MP3)
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If you are lucky, you can then just search the internet for "codec acm"
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e.g. "mp3 acm". Or if the codec is already installed on Windows,
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it will show up in the system.ini as:
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msacm.l3acm=L3codeca.acm
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Note that the audio codecs are specified by the MSACM prefix:
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DirectShow codecs:
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~~~~~~~~~~~~~~~~~~
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DirectShow is the newer video API, which is even worse than its predecessor.
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Things are harder with DirectShow, since 'system.ini' does not contain the
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needed information, instead it is stored in the registry and we need the
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GUID of the codec.
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New Method:
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-----------
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Using Microsoft GraphEdit (fast)
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- Get GraphEdit from the Microsoft SDK, DirectX SDK or doom9.
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- Start 'graphedit.exe'.
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- From the menu select "Graph -> Insert Filters".
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- Expand item "DirectShow Filters".
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- Select the right codec name and expand item.
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- In the entry "DisplayName" look at the text in winged brackets after the
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backslash and write it down (five dash-delimited blocks, the GUID).
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- The codec binary is the file specified in the "Filename" entry.
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If there is no "Filename" and "DisplayName" contains something like
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'device:dmo', then it is a DMO-Codec.
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Old Method:
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-----------
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Take a deep breath and start searching the registry...
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- Start 'regedit'.
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- Press "Ctrl-F", disable the first two checkboxes, and enable the third.
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Type in the fourcc of the codec (e.g. "TM20").
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- You should see a field which contains the path and the filename (e.g.
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"C:\WINDOWS\SYSTEM\TM20DEC.AX").
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- Now that you have the file, we need the GUID. Try searching again, but
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now search for the codec's name, not the fourcc. Its name can be acquired
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when Media Player is playing the file, by checking
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"File -> Properties -> Advanced".
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If not, you are out of luck. Try guessing (e.g. search for TrueMotion).
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- If the GUID is found you should see a "FriendlyName" and a "CLSID" field.
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Write down the 16 byte CLSID, this is the GUID we need.
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If searching fails, try enabling all the checkboxes. You may have
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false hits, but you may get lucky...
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Tips:
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~~~~~~~
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If you get an error loading a new codec, it may need some more files to work.
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Start the filemon utility before loading MPlayer to find out which DLLs are
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trying to be loaded.
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Your codec may load some external DLL libraries. If the codec is already
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installed in Windows, run listdlls wmplayer.exe while Windows Media
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Player is playing your file to find out which.
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