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DirectShowSource - Avisynth wiki
http://avisynth.nl/index.php/DirectShowSource
DirectShowSource(string filename [, float fps, bool seek, bool audio, bool video, bool convertfps, bool seekzero, int timeout, string pixel_type, int framecount, string logfile, int logmask] ) . string filename = The path of the source file; path can be omitted if the source file is in the same directory as the AviSynth script (*.avs).
DirectShowSource Avisynth Filter
http://www.avisynth.org.ru/docs/english/corefilters/directshowsource.htm
DirectShowSource only accepts YV12, YUY2, ARGB, RGB32 and RGB24 video formats and 32, 24, 16 and 8 bit PCM and IEEE FLOAT audio formats. A given GRF-file should only target one of an audio or video stream to avoid confusion when directshowsource attempts the connection to your open pin(s).
DirectShowSource - AviSynth
https://avisynth.sinsixx.com/DirectShowSource.html
This is useful when you want to open vfr video (for example mkv or wmv with hybrid video) in AviSynth. Example DirectShowSource ("F:\Guides\Hybrid\vfr_startrek.mkv", fps=119.88, convertfps=true) Troubleshooting video and audio problems AviSynth will by default try to open only the media it can open without any problems.
AviSynth Problems, no audio with DirectShowSource ...
https://forum.videohelp.com/threads/35185-AviSynth-Problems-no-audio-with-DirectShowSource
If I get a Video.mpg in AviSynth script DirectShowSource("c:\Video.mpg") I get no Audio If I take that test.avs and open it with GraphEdit I only have Video Stream. If I do the same but with an avi source I get Audio and Video Stream. On the help.doc it says I could open mp3 too with DirectShowSource but no luck.
FAQ loading clips - Avisynth wiki
http://avisynth.nl/index.php/FAQ_loading_clips
using the DirectShowSource plugin. using Graphedit. Make sure that your clip contains maximal one video and/or one audio stream (thus remove the subtitles and remove other video/audio streams). If you want to load a clip which contains both video and audio, you have two options: Demux the audio stream and load the streams separately in AviSynth.
Importing media - Avisynth wiki
http://avisynth.nl/index.php/Importing_media
using the DirectShowSource plugin. Make sure that your clip contains maximal one video and/or one audio stream (thus remove the subtitles and remove other video/audio streams). If you want to load a clip which contains both video and audio, you have two options: Demux the audio stream and load the streams separately in AviSynth.
Avisynth: Directshowsource vs AVIsource? - digitalFAQ.com ...
http://www.digitalfaq.com/archives/avisynth/10399-avisynth-directshowsource-vs.html
there is no principle difference in using directshowsource or avisource, you wont get better video quality either way the simplest chain for decoding an avifile would be "file source"-->"AVIsplitter"--->"audio/video decoder"--->"audio/video renderer" this is the same for directshow or VFW.
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