mirror of https://github.com/odrling/Aegisub
92 lines
2.6 KiB
HTML
92 lines
2.6 KiB
HTML
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<title>
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FFmpegSource Documentation
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</title>
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</head>
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<h1>FFmpegSource Documentation</h1>
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<h2>Changes</h2>
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<ul>
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<li>1.2<ul>
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<li>Compiled against ffmpeg rev9451</li>
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<li>Somewhat cleaner source code</li>
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<li>Linear access in addition to a few other modes of seeking can now be forced</li>
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<li>Can now save the index information to a file which makes subsequent file opening fast</li>
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<li>No longer skips indexing for any format</li>
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</ul></li>
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<li>1.1<ul>
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<li>Skip indexing for avi</li>
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<li>Prefix all error messages with the plugin name</li>
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<li>Can write v2 timecodes to a file</li>
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<li>Fixed reported framerate</li>
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</ul></li>
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</ul>
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<h2>Usage</h2>
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<p>
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<b>FFmpegSource(string source, int track = -1, int seekmode = 1, string timecodes, bool cache = true, string CacheFile)</b>
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</p>
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<p>
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<b>source:</b>
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source file
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</p>
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<p>
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<b>track:</b>
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track number as seen by the relevant demuxer, starts from 0, -1 means will pick the first video track
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</p>
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<p>
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<b>seekmode:</b>
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force how seeking is handled, has no effect on matroska files which always use the equivalent of seekmode=1<br />
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<b>0:</b> linear access, the definition of slow but should make some formats "usable"<br />
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<b>1:</b> safe normal, bases seeking decisions on the reported keyframe positions<br />
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<b>2:</b> unsafe normal, same as 1 but no error will be thrown if the exact destination has to be guessed<br />
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<b>3:</b> aggressive, seek in the forward direction even if no closer keyframe is known to exist, only useful for containers where avformat doesn't report keyframes properly and testing
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</p>
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<p>
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<b>timecodes:</b>
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file to output timecodes to, if the file exists it will always be overwritten
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</p>
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<p>
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<b>cache:</b>
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write indexing information to a file for later use
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</p>
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<p>
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<b>cachefile:</b>
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if specified the file to store the index information in, if nothing is specified <source>.ffcache is used
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</p>
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<h2>Compatibility</h2>
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<ul>
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<li>AVI, MKV, MP4, FLV: Frame accurate</li>
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<li>OGM: Messed up first frame and seeking produces smearing with seekmode=3, incredibly slow seeking without</li>
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<li>WMV: No seeking</li>
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<li>VOB: No rff flags applied, frame accurate?</li>
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<li>MPG: Seeking seems to be off by one or two frames now and then</li>
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<li>TS: Anything except seekmode=0 is a complete waste of time</li>
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</ul>
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<h2>Compiling</h2>
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<p><b>zlib</b> from http://www.zlib.net/</p>
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<p><b>FFmpeg svn</b> from http://ffmpeg.mplayerhq.hu/</p>
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<p><b>Required Configuration:</b>
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./configure --enable-shared --disable-static --enable-memalign-hack --enable-swscaler --enable-gpl</p>
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<p><b>Suggested Additional Options:</b>
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--disable-encoders --disable-muxers</p>
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</body>
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</html>
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