ffmpeg-avfilter 1.2.1 · OCaml Package

This module provides an API to AVfilter.

type config

type valued_arg = [

| `String of string
| `Int of int
| `Int64 of int64
| `Float of float
| `Rational of Avutil.rational

]

type args = [

| `Flag of string
| `Pair of string * valued_arg

]

type ('a, 'b) av = {

audio : 'a;
video : 'b;

}

type ('a, 'b) io = {

inputs : 'a;
outputs : 'b;

}

type ('a, 'b, 'c) pad

(attached/unattached, audio/video, input/output) pad

type ('a, 'b) pads =
  (('a, [ `Audio ], 'b) pad list, ('a, [ `Video ], 'b) pad list) av

type flag = [

| `Dynamic_inputs
| `Dynamic_outputs
| `Slice_threads
| `Support_timeline_generic
| `Support_timeline_internal

]

type 'a filter = {

name : string;
description : string;
options : Avutil.Options.t;
flags : flag list;
io : (('a, [ `Input ]) pads, ('a, [ `Output ]) pads) io;

}

type 'a input = [ `Frame of 'a Avutil.frame | `Flush ] -> unit

type 'a context

type 'a output = {

context : 'a context;
handler : unit -> 'a Avutil.frame;

}

type 'a entries = (string * 'a) list

type inputs = ([ `Audio ] input entries, [ `Video ] input entries) av

type outputs = ([ `Audio ] output entries, [ `Video ] output entries) av

type t = (inputs, outputs) io

val time_base : _ context -> Avutil.rational

val frame_rate : [ `Video ] context -> Avutil.rational

val width : [ `Video ] context -> int

val height : [ `Video ] context -> int

val pixel_aspect : [ `Video ] context -> Avutil.rational option

val pixel_format : [ `Video ] context -> Avutil.Pixel_format.t

val channels : [ `Audio ] context -> int

val channel_layout : [ `Audio ] context -> Avutil.Channel_layout.t

val sample_rate : [ `Audio ] context -> int

val sample_format : [ `Audio ] context -> Avutil.Sample_format.t

val set_frame_size : [ `Audio ] context -> int -> unit

exception Exists

val filters : [ `Unattached ] filter list

Filter list.

val find : string -> [ `Unattached ] filter

val find_opt : string -> [ `Unattached ] filter option

val abuffer : [ `Unattached ] filter

Buffers (input).

val buffer : [ `Unattached ] filter

val abuffersink : [ `Unattached ] filter

Sinks (output).

val buffersink : [ `Unattached ] filter

val pad_name : (_, _, _) pad -> string

Pad name.

val init : unit -> config

Initiate a filter graph configuration.

val attach : 
  ?args:args list ->
  name:string ->
  [ `Unattached ] filter ->
  config ->
  [ `Attached ] filter

Attach a filter to a filter graph configuration. Raises Exists if there is already a filter by that name in the graph. Number of inputs or outputs can change from the filter's specifications, in particular if the filter has the `Dynamic_input or `Dynamic_output flag set.

val link : 
  ([ `Attached ], 'a, [ `Output ]) pad ->
  ([ `Attached ], 'a, [ `Input ]) pad ->
  unit

Link two filter pads.

type command_flag = [

| `Fast

]

val process_command : 
  ?flags:command_flag list ->
  cmd:string ->
  ?arg:string ->
  [ `Attached ] filter ->
  string

Send a command to a attached filter pad.

type ('a, 'b, 'c) parse_node = {

node_name : string;
node_args : args list option;
node_pad : ('a, 'b, 'c) pad;

}

Parse a graph described by a string and attach outputs/inputs to it.

type ('a, 'b) parse_av =
  (('a, [ `Audio ], 'b) parse_node list, ('a, [ `Video ], 'b) parse_node list)
    av

type 'a parse_io = (('a, [ `Input ]) parse_av, ('a, [ `Output ]) parse_av) io

val parse : 
  [ `Unattached ] parse_io ->
  string ->
  config ->
  [ `Attached ] parse_io

val launch : config -> t

Check validity and configure all the links and formats in the graph and return its outputs and outputs.

module Utils : sig ... end

package ffmpeg-avfilter