python-ffmpeg

A python interface for FFmpeg using asyncio

Requirements

• Python 3.5+
• pyee

Installation

pip install python-ffmpeg

Usage

import asyncio
from ffmpeg import FFmpeg

ffmpeg = FFmpeg().option('y').input(
    'rtsp://example.com/cam',
    # Specify file options using kwargs
    rtsp_transport='tcp',
    rtsp_flags='prefer_tcp',
).output(
    'output.ts',
    # Use a dictionary when an option name contains special characters
    {'codec:v': 'copy'},
    f='mpegts',
)

@ffmpeg.on('start')
def on_start(arguments):
    print('Arguments:', arguments)

@ffmpeg.on('stderr')
def on_stderr(line):
    print('stderr:', line)

@ffmpeg.on('progress')
def on_progress(progress):
    print(progress)

@ffmpeg.on('progress')
def time_to_terminate(progress):
    # Gracefully terminate when more than 200 frames are processed
    if progress.frame > 200:
        ffmpeg.terminate()

@ffmpeg.on('completed')
def on_completed():
    print('Completed')

@ffmpeg.on('terminated')
def on_terminated():
    print('Terminated')

@ffmpeg.on('error')
def on_error(code):
    print('Error:', code)

loop = asyncio.get_event_loop()
loop.run_until_complete(ffmpeg.execute())
loop.close()

API

FFmpeg

init(executable='ffmpeg')

• executable: the path to the ffmpeg executable

Initializes the FFmpeg instance.

option(key, value=None)

• key
• value

Specifies a global option -key or -key value

input(url, options=None, **kwargs)

• url
• options
• kwargs

Specifies an input file. An arbitrary number of input files can be specified by calling this method multiple times.

output(url, options=None, **kwargs)

• url
• options
• kwargs

Specifies an output file. An arbitrary number of output files can be specified by calling this method multiple times.

execute()

Executes FFmpeg using specified options and files.

terminate()

Gracefully terminates the running FFmpeg process.

on(event, listener=None)

• event: the name of the event
• listener: the callback function

Registers the listener to the event. This method can be used as a decorator.

Event: 'start'

• arguments: a sequence of arguments to execute FFmpeg

The 'start' event is emitted just before FFmpeg is executed.

Event: 'stderr'

• line

The 'stderr' event is emitted when FFmpeg writes a line to stderr.

Event: 'progress'

• progress: a namedtuple with frame, fps, size, time, bitrate, speed fields

The 'progress' event is emitted when FFmpeg reports progress.

Event: 'completed'

The 'completed' event is emitted when FFmpeg is successfully exited.

Event: 'terminated'

The 'terminated' event is emitted when FFmpeg is terminated by calling FFmpeg.terminate().

Event: 'error'

• code: a return code of the FFmpeg process

The 'error' event is emitted when FFmpeg is exited with a non-zero return code