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207 lines
6.9 KiB
207 lines
6.9 KiB
4 years ago
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<html>
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<head>
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<title> Linux Video Stream Processing Tool - Examples</title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="keywords" content="DVD, digital video, DV, encoder, divx,
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DivX;-), lame, source, posix, avifile, opendivx, codec, linux, AC3,
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program stream, video, audio, transcode, decoder, stream, YV12">
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</head>
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<body bgcolor=#CDB5CD>
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<a name=top></a>
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<table cellspacing="10" cellpadding="0" border="0" width="100%">
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<tr>
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<td align=left valign="top" width=30% bgcolor="#a0a0a0">
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<table border="0" cellpadding="10" cellspacing="3" font size=+2 bgcolor="#ffffff" width=100%>
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<td align="left" bgcolor="#e9e9e9"> <FONT
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FACE="Lucida,Helvetica">Introduction:</font>
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</tr>
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<tr>
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<td>
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<ul>
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<li> <a href="#about"> <FONT FACE="Lucida,Helvetica">
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Overview</i></font></a> <p>
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<li> <a href="options.html"> <FONT FACE="Lucida,Helvetica">
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Command-line options</font></a> <p>
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<li> <a href="modules.html"> <FONT FACE="Lucida,Helvetica">
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Import/export/filter plug-ins</font></a> <p>
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</ul>
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</td>
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</tr>
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</table>
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</table>
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<a name=about></a>
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<table cellspacing="10" cellpadding="0" border="0" width="100%">
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<tr>
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<td align=left valign="top" width=30% bgcolor="#a0a0a0">
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<table border="0" cellpadding="10" cellspacing="3" font size=+2 bgcolor="#ffffff" width=100%>
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<td align="left" bgcolor="#e9e9e9"> <FONT
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FACE="Lucida,Helvetica">Overview:
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</tr>
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<tr>
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<td>
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<FONT color=red><i> transcode </i> </font>
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is a linux text-console utility for video stream processing,
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running on a platform that supports shared libraries and threads.
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Decoding and encoding is done by loading modules that are responsible
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for feeding transcode with raw video/audio streams (import modules)
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and encoding the frames (export modules). It supports elementary video
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and audio frame transformations, including de-interlacing
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or fast resizing of video frames and loading of external filters.
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A number of modules are included to enable import of DVDs on-the-fly,
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MPEG elementary (ES) or program streams (VOB), MPEG video,
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Digital Video (DV),
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YUV4MPEG streams, NuppelVideo file format and raw or compressed (pass-through) video frames
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and export modules for writing DivX;-), OpenDivX, DivX 4.xx or
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uncompressed AVI files with MPEG, AC3 (pass-through) or PCM audio.
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Additional export modules to write single frames (PPM) or
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YUV4MPEG streams are available, as well as an interface import module
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to the <i>avifile</i> library.
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It's modular concept is intended to provide flexibility and easy user
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extensibility to include other video/audio codecs or file types.
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A set of tools is included to demux (<FONT color=red><i>tcdemux</i></font>), extract (<FONT color=red><i>tcextract</i></font>) and decode
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(<FONT color=red><i>tcdecode</i></font>) the sources
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into raw video/audio streams for import, probing (<FONT
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color=red><i>tcprobe</i></font>) and scanning (<FONT
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color=red><i>tcscan</i></font>) your sources and to enable post-processing
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of AVI files, fixing AVI file header information (<FONT
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color=red><i>avifix</i></font>), merging multiple files (<FONT color=red><i>avimerge</i></font>) or splitting
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large AVI files (<FONT color=red><i>avisplit</i></font>) to fit on a CD.
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<p><p>
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<b><i>transcode</i></b> plug-in architecture overview:<p>
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<i>transcode</i> loads shared library modules that are responsible for feeding it with raw streams and encoding the frames.
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<ul>
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<li> The <b>import modules</b> for audio/video decoding are loaded with
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<i>dlopen</i> system call and are
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responsible for starting the video and audio streams (directly or via the
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<i>popen</i> system call) and have a single function interface to the main program.
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The import is handled by a thread that buffers the video/audio frames.<p>
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<li> The main program <b><i>transcode</i></b> currently performs
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a number of video/audio frame manipulations (in
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this order) or allows simple pass-through of raw frame data:
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<p>
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<font size=+2 color=blue>Video:</font>
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<ul>
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<li> cut out arbitrary frame region before processing
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<li> de-interlace video frame
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<li> fast enlarging of video width/height by a
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multiple of 8/16/32 rows/columns up to 1024x768
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<li> fast reduction of video width/height by a multiple of 8/16/32 rows/columns
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<li> high-quality resizing with different filtering
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<li> cut out arbitrary frame region for encoding
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<li> fast rescale (down-sample) video width/height by a power of 2
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<li> flip video frame upside down
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<li> mirror image of video frame
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<li> swap <i>red</i> and <i>blue</i> bytes or chroma
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components in video frame
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<li> transform to b/w video frame
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<li> apply gamma correction
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<li> anti-alias video frame
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<li> DVD subtitle overlay (plug-in)
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</ul>
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<p>
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<font size=+2 color=blue>Audio:</font>
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<ul>
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<li> swap byte order in audio stream
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<li> change the volume of the audio stream
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<li> re-sample audio stream (plug-in)
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<li> down-sample to mono
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<li> down-sample to 8-bit unsigned byte stream
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<li> sync video with audio frames (V=0|A=N, V=1|A=N+1,...)
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</ul>
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<p>
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<font size=+2 color=blue>Filter Plug-Ins:</font>
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<ul> <li>Additional effects are available via <a href=filter.html>external filter plug-ins</a> loaded with option "-J".
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</ul><p>
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<li> The <b>export modules</b> for audio/video encoding
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are loaded via the <i>dlopen</i> system call and the
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encoder loop is started for the selected frames. In
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most cases audio and video are handled by the same
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module.
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</ul>
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<p>
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<b><i>transcode</i></b> supported formats and codecs overview:<p>
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<table cellspacing="10" cellpadding="0" border="0" width="100%">
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<tr>
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<td align=center>
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<img src="tc.png">
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</td>
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</tr>
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<tr><td align=center>
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(ES=elementary stream, including
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concatenated frames, PES=packetized elementary stream,
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including program streams)</tr>
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</table>
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<p>
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Colored boxes are supported without additional packages. However, most
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capabilities are only available in the <i>0.6.0</i> pre-releases.
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Unconnected boxes not yet implemented, but <i>0.6.0</i> (final) will
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have a symmetrical butterfly structure.
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OpenDivX
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(obsolete) support included, but much newer and faster DIVX
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encoding/decoding requires additional codecs available for linux.
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Picture import supported by newer versions of <i>ImageMagick</i>
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(0.5.x). Additional optional audio/video import codecs supported by using the
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<i>avifile</i> library. Quicktime movie with limited codec
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support is available via
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the <i>quicktime4linux</i> library. You need <i>libdv</i>
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installed to enable Digital Video decoding/encoding. <p>
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</tr>
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</tr>
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</table>
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</table>
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<!-- hhmts start -->
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Last modified: Fri Nov 29 15:45:16 Europe/Berlin 2002
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<!-- hhmts end -->
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</body> </html>
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