Number of outputs is determined at runtime. This filter hasĭynamic outputs: returned value is a tuple of audio and video outputs. Here’s an example for dynamic outputs: % liquidsoap -h įfmpeg filter: Pass on the audio input to N audio outputs. Typically, splits a video stream into multiple streams and merges multiple video streams into a single one.įor these filters, the operators’ signature is a little different.

Filters with dynamic inputs or outputsįilters with dynamic inputs or outputs can have multiple inputs or outputs, decided at run-time. provides a more straight forward API to filters.

The API is intended for advanced use if you want to use filter commands. Then, we apply the expected input to the filter and return the pair (s, set_volume) of source and function.

The filter instance has a process_command, which we use to create the set_volume function. Here’s an example:ĭef dynamic_volume(s) = def mkfilter(graph) = filter = (graph) def set_volume(v) = ignore( filter.process_command( 'volume', '#')) end s = (graph, s) t_input(s) s = filter.output s = (graph, s) (s, set_volume) end (mkfilter) end let (s, set_volume) = dynamic_volume(s)įirst, we instantiate a volume filter via. Conversely, sources can be created from them using and .įilters are configured within the closure of a function. * (unlabeled) : (default: None)įilters input and output are abstract values of type and. For instance: Ffmpeg filter: Add echoing to the audio. If enabled, the filters should appear as operators, prefixed with ffmpeg.filter. They are enabled in liquidsoap when compiled with the optional ffmpeg-avfilter. FFmpeg filters provide audio and video filters that can be used to transform content using the ffmpeg library.

Ffmpeg filter time