79 lines
2.7 KiB
Text
79 lines
2.7 KiB
Text
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Getting Started
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===============
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So you managed to install VapourSynth. Now what?
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If you don't know the basics of Python, you may want to check out a
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`tutorial <https://learnxinyminutes.com/docs/python3/>`_.
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You can "play around" in the python interpreter if you want, but that's not how
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most scripts are created.
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Example Script
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##############
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It all starts with a *.vpy* script.
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Here's a sample script to be inspired by, it assumes that `BestSource <https://github.com/vapoursynth/bestsource>`_
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is installed and :doc:`auto-loaded <installation>`.
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.. code-block:: python
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from vapoursynth import core # Get an instance of the core
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clip = core.bs.VideoSource(source='filename.mkv') # Load a video track in mkv file
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clip = core.std.FlipHorizontal(clip) # Flip the video clip in the horizontal direction
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clip.set_output() # Set the video clip to be accessible for output
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Audio is also supported, use `BestSource <https://github.com/vapoursynth/bestsource>`_ to load your audio file.
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.. code-block:: python
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from vapoursynth import core # Get an instance of the core
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clip = core.bs.AudioSource(source='filename.mkv') # Load an audio track in mkv file
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clip = core.std.AudioGain(clip,gain=2.0) # Gain all channels 2x
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clip.set_output() # Set the audio clip to be accessible for output
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You can combine 2 operations in one script.
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.. code-block:: python
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from vapoursynth import core
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video = core.bs.VideoSource(source='filename.mkv')
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audio = core.bs.AudioSource(source='filename.mkv')
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video = core.std.FlipHorizontal(video)
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audio = core.std.AudioGain(audio,gain=2.0)
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video.set_output(index=0)
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audio.set_output(index=1)
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Remember that most VapourSynth objects have a quite nice string representation
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in Python, so if you want to know more about an instance just call ``print()``.
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Preview
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#######
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It's possible to directly open the script in `VapourSynth Editor <https://github.com/YomikoR/VapourSynth-Editor>`_
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or `VirtualDub FilterMod <https://sourceforge.net/projects/vdfiltermod/>`_ for previewing.
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Output with VSPipe
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##################
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VSPipe is very useful to pipe the output to various applications, for example x264 and flac for encoding.
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Here are some examples of command lines that automatically pass on most video and audio attributes.
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For x264::
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vspipe -c y4m script.vpy - | x264 --demuxer y4m - --output encoded.264
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For flac::
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vspipe -c wav script.vpy - | flac - -o encoded.flac
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For FFmpeg::
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vspipe -c y4m script.vpy - | ffmpeg -i - encoded.mkv
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For mpv::
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vspipe -c y4m script.vpy - | mpv -
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vspipe -c wav script.vpy - | mpv -
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