ffmpeg_utils

Module to change the configuration of FFmpeg libraries (such as libavformat).

It affects functionalities in torchaudio.io (and indirectly torchaudio.load()).

get_audio_decoders

torchaudio.utils.ffmpeg_utils.get_audio_decoders() → Dict[str, str]

Get the available audio decoders.

Returns:

Mapping from decoder short name to long name.

Return type:

Dict[str, str]

Example

>>> for k, v in get_audio_decoders().items():
>>>     print(f"{k}: {v}")
... a64: a64 - video for Commodore 64
... ac3: raw AC-3
... adts: ADTS AAC (Advanced Audio Coding)
... adx: CRI ADX
... aiff: Audio IFF

get_audio_encoders

torchaudio.utils.ffmpeg_utils.get_audio_encoders() → Dict[str, str]

Get the available audio encoders.

Returns:

Mapping from encoder short name to long name.

Return type:

Dict[str, str]

Example

>>> for k, v in get_audio_encoders().items():
>>>     print(f"{k}: {v}")
... comfortnoise: RFC 3389 comfort noise generator
... s302m: SMPTE 302M
... aac: AAC (Advanced Audio Coding)
... ac3: ATSC A/52A (AC-3)
... ac3_fixed: ATSC A/52A (AC-3)
... alac: ALAC (Apple Lossless Audio Codec)

get_build_config

torchaudio.utils.ffmpeg_utils.get_build_config() → str

Get the FFmpeg build configuration

Returns:

Build configuration string.

Return type:

str

Example

>>> print(get_build_config())
--prefix=/Users/runner/miniforge3 --cc=arm64-apple-darwin20.0.0-clang --enable-gpl --enable-hardcoded-tables --enable-libfreetype --enable-libopenh264 --enable-neon --enable-libx264 --enable-libx265 --enable-libaom --enable-libsvtav1 --enable-libxml2 --enable-libvpx --enable-pic --enable-pthreads --enable-shared --disable-static --enable-version3 --enable-zlib --enable-libmp3lame --pkg-config=/Users/runner/miniforge3/conda-bld/ffmpeg_1646229390493/_build_env/bin/pkg-config --enable-cross-compile --arch=arm64 --target-os=darwin --cross-prefix=arm64-apple-darwin20.0.0- --host-cc=/Users/runner/miniforge3/conda-bld/ffmpeg_1646229390493/_build_env/bin/x86_64-apple-darwin13.4.0-clang  # noqa

get_demuxers

torchaudio.utils.ffmpeg_utils.get_demuxers() → Dict[str, str]

Get the available demuxers.

Returns:

Mapping from demuxer (format) short name to long name.

Return type:

Dict[str, str]

Example

>>> for k, v in get_demuxers().items():
>>>     print(f"{k}: {v}")
... aa: Audible AA format files
... aac: raw ADTS AAC (Advanced Audio Coding)
... aax: CRI AAX
... ac3: raw AC-3

get_input_devices

torchaudio.utils.ffmpeg_utils.get_input_devices() → Dict[str, str]

Get the available input devices.

Returns:

Mapping from device short name to long name.

Return type:

Dict[str, str]

Example

>>> for k, v in get_input_devices().items():
>>>     print(f"{k}: {v}")
... avfoundation: AVFoundation input device
... lavfi: Libavfilter virtual input device

get_input_protocols

torchaudio.utils.ffmpeg_utils.get_input_protocols() → List[str]

Get the supported input protocols.

Returns:

The names of supported input protocols

Return type:

List[str]

Example

>>> print(get_input_protocols())
... ['file', 'ftp', 'hls', 'http','https', 'pipe', 'rtmp', 'tcp', 'tls', 'udp', 'unix']

get_log_level

torchaudio.utils.ffmpeg_utils.get_log_level() → int

Get the log level of FFmpeg.

See set_log_level() for the detailo.

get_muxers

torchaudio.utils.ffmpeg_utils.get_muxers() → Dict[str, str]

Get the available muxers.

Returns:

Mapping from muxer (format) short name to long name.

Return type:

Dict[str, str]

Example

>>> for k, v in get_muxers().items():
>>>     print(f"{k}: {v}")
... a64: a64 - video for Commodore 64
... ac3: raw AC-3
... adts: ADTS AAC (Advanced Audio Coding)
... adx: CRI ADX
... aiff: Audio IFF

get_output_devices

torchaudio.utils.ffmpeg_utils.get_output_devices() → Dict[str, str]

Get the available output devices.

Returns:

Mapping from device short name to long name.

Return type:

Dict[str, str]

Example

>>> for k, v in get_output_devices().items():
>>>     print(f"{k}: {v}")
... audiotoolbox: AudioToolbox output device

get_output_protocols

torchaudio.utils.ffmpeg_utils.get_output_protocols() → List[str]

Get the supported output protocols.

Returns:

The names of supported output protocols

Return type:

list of str

Example

>>> print(get_output_protocols())
... ['file', 'ftp', 'http', 'https', 'md5', 'pipe', 'prompeg', 'rtmp', 'tee', 'tcp', 'tls', 'udp', 'unix']

get_versions

torchaudio.utils.ffmpeg_utils.get_versions() → Dict[str, Tuple[int]]

Get the versions of FFmpeg libraries

Returns:

mapping from library names to version string,

i.e. “libavutil”: (56, 22, 100).

Return type:

dict

Tutorials using get_versions:

StreamWriter Basic Usage

StreamWriter Basic Usage

get_video_decoders

torchaudio.utils.ffmpeg_utils.get_video_decoders() → Dict[str, str]

Get the available video decoders.

Returns:

Mapping from decoder short name to long name.

Return type:

Dict[str, str]

Example

>>> for k, v in get_video_decoders().items():
>>>     print(f"{k}: {v}")
... aasc: Autodesk RLE
... aic: Apple Intermediate Codec
... alias_pix: Alias/Wavefront PIX image
... agm: Amuse Graphics Movie
... amv: AMV Video
... anm: Deluxe Paint Animation

get_video_encoders

torchaudio.utils.ffmpeg_utils.get_video_encoders() → Dict[str, str]

Get the available video encoders.

Returns:

Mapping from encoder short name to long name.

Return type:

Dict[str, str]

Example

>>> for k, v in get_audio_encoders().items():
>>>     print(f"{k}: {v}")
... a64multi: Multicolor charset for Commodore 64
... a64multi5: Multicolor charset for Commodore 64, extended with 5th color (colram)
... alias_pix: Alias/Wavefront PIX image
... amv: AMV Video
... apng: APNG (Animated Portable Network Graphics) image
... asv1: ASUS V1
... asv2: ASUS V2

set_log_level

torchaudio.utils.ffmpeg_utils.set_log_level(level: int)

Set the log level of FFmpeg (libavformat etc)

Parameters:

level (int) –

Log level. The larger, the more verbose.

The following values are common values, the corresponding ffmpeg’s -loglevel option value and desription.

• -8 (quiet): Print no output.

• 0 (panic): Something went really wrong and we will crash now.

• 8 (fatal): Something went wrong and recovery is not possible. For example, no header was found for a format which depends on headers or an illegal combination of parameters is used.

• 16 (error): Something went wrong and cannot losslessly be recovered. However, not all future data is affected.

• 24 (warning): Something somehow does not look correct. This may or may not lead to problems.

• 32 (info): Standard information.

• 40 (verbose): Detailed information.

• 48 (debug): Stuff which is only useful for libav* developers.

• 56 (trace): Extremely verbose debugging, useful for libav* development.