+[![Build Status](https://github.com/pukkandan/yt-dlc/workflows/CI/badge.svg?branch=master)](https://github.com/pukkandan/yt-dlc/actions?query=workflow%3ACI)
+[![Release Version](https://img.shields.io/badge/Release-2021.01.07-1-brightgreen)](https://github.com/pukkandan/yt-dlc/releases/latest)
+[![License: Unlicense](https://img.shields.io/badge/License-Unlicense-blue.svg)](https://github.com/pukkandan/yt-dlc/blob/master/LICENSE)
+
+youtube-dlc - download videos from youtube.com and many other [video platforms](docs/supportedsites.md)
+
This is a fork of [youtube-dlc](https://github.com/blackjack4494/yt-dlc) which is inturn a fork of [youtube-dl](https://github.com/ytdl-org/youtube-dl)
-<!--
-[![](https://img.shields.io/badge/Fork-2020.10.19.01-brightgreen?style=for-the-badge&logo=GitHub)](https://github.com/pukkandan/youtube-dl)
-[![](https://img.shields.io/badge/youtube--dl-2020.09.20-blue?style=for-the-badge&logo=GitHub)](https://github.com/ytdl-org/youtube-dl)
--->
-
-- [CHANGES FROM YOUTUBE-DLC](#changes)
-- [ABOUT THIS FORK](#about-this-fork)
-- [INSTALLATION](#installation)
-- [YOUTUBE-DLC](#youtube-dlc)
-- [DESCRIPTION](#description)
-- [OPTIONS](#options)
+* [CHANGES FROM YOUTUBE-DLC](#changes)
+* [INSTALLATION](#installation)
+ * [UPDATE](#update)
+ * [COMPILE](#compile)
+* [YOUTUBE-DLC](#youtube-dlc)
+* [DESCRIPTION](#description)
+* [OPTIONS](#options)
* [Network Options](#network-options)
* [Geo Restriction](#geo-restriction)
* [Video Selection](#video-selection)
* [Post-processing Options](#post-processing-options)
* [SponSkrub Options (SponsorBlock)](#sponskrub-options-sponsorblock)
* [Extractor Options](#extractor-options)
-- [CONFIGURATION](#configuration)
+* [CONFIGURATION](#configuration)
* [Authentication with .netrc file](#authentication-with-netrc-file)
-- [OUTPUT TEMPLATE](#output-template)
+* [OUTPUT TEMPLATE](#output-template)
* [Output template and Windows batch files](#output-template-and-windows-batch-files)
* [Output template examples](#output-template-examples)
-- [FORMAT SELECTION](#format-selection)
+* [FORMAT SELECTION](#format-selection)
* [Filtering Formats](#filtering-formats)
* [Sorting Formats](#sorting-formats)
* [Format Selection examples](#format-selection-examples)
-- [VIDEO SELECTION](#video-selection-1)
-- [MORE](#more)
+* [VIDEO SELECTION](#video-selection-1)
+* [MORE](#more)
# CHANGES
See [commits](https://github.com/pukkandan/yt-dlc/commits) for more details
-### 2021.01.05.01
+### 2021.01.05
* **Format Sort:** Added `--format-sort` (`-S`), `--format-sort-force` (`--S-force`) - See [Sorting Formats](#sorting-formats) for details
* **Format Selection:** See [Format Selection](#format-selection) for details
* New format selectors: `best*`, `worst*`, `bestvideo*`, `bestaudio*`, `worstvideo*`, `worstaudio*`
* Added `--list-formats-as-table`, `--list-formats-old`
* **Negative Options:** Makes it possible to negate boolean options by adding a `no-` to the switch
* Added `--no-ignore-dynamic-mpd`, `--no-allow-dynamic-mpd`, `--allow-dynamic-mpd`, `--youtube-include-hls-manifest`, `--no-youtube-include-hls-manifest`, `--no-youtube-skip-hls-manifest`, `--no-download`, `--no-download-archive`, `--resize-buffer`, `--part`, `--mtime`, `--no-keep-fragments`, `--no-cookies`, `--no-write-annotations`, `--no-write-info-json`, `--no-write-description`, `--no-write-thumbnail`, `--youtube-include-dash-manifest`, `--post-overwrites`, `--no-keep-video`, `--no-embed-subs`, `--no-embed-thumbnail`, `--no-add-metadata`, `--no-include-ads`, `--no-write-sub`, `--no-write-auto-sub`, `--no-playlist-reverse`, `--no-restrict-filenames`, `--youtube-include-dash-manifest`, `--no-format-sort-force`, `--flat-videos`, `--no-list-formats-as-table`, `--no-sponskrub`, `--no-sponskrub-cut`, `--no-sponskrub-force`
- * Renamed: `--write-subs`, --no-write-subs`, `--no-write-auto-subs, `--write-auto-subs`. Note that these can still be used without the ending "s"
+ * Renamed: `--write-subs`, `--no-write-subs`, `--no-write-auto-subs`, `--write-auto-subs`. Note that these can still be used without the ending "s"
* Relaxed validation for format filters so that any arbitrary field can be used
* Fix for embedding thumbnail in mp3 by @pauldubois98
* Make Twitch Video ID output from Playlist and VOD extractor same. This is only a temporary fix
* **Merge youtube-dl:** Upto [2020.01.03](https://github.com/ytdl-org/youtube-dl/commit/8e953dcbb10a1a42f4e12e4e132657cb0100a1f8) - See [blackjack4494/yt-dlc#280](https://github.com/blackjack4494/yt-dlc/pull/280) for details
* Cleaned up the fork for public use
-### 2021.01.05.02
+### 2021.01.05-1
* **Changed defaults:**
* Enabled `--ignore`
* Disabled `--video-multistreams` and `--audio-multistreams`
* Changed default output template to `%(title)s [%(id)s].%(ext)s`
* Enabled `--list-formats-as-table`
+### 2021.01.07
+* Removed priority of `av01` codec in `-S` since most devices don't support it yet
+* Added `duration_string` to be used in `--output`
+* Created First Release
-# ABOUT THIS FORK
-
-WIP
+### 2021.01.07-1
+* [Akamai] fix by @nixxo
+* [Tiktok] fix extractor by @GreyAlien502
+* [vlive] add support for playlists by @kyuyeunk
+* [youtube_live_chat] make sure playerOffsetMs is positive by @siikamiika
+* Ignore extra data streams in ffmpeg by @jbruchon
+* Allow passing different arguments to different postprocessors using `--postprocessor-args`
+* Deprecated `--sponskrub-args`. The same can now be done using `--postprocessor-args "sponskrub:<args>"`
# INSTALLATION
-WIP
-
-<!--
-I don't plan on making any releases. If anyone wants to create and maintain releases for this fork, please contact me.
-
-You can clone / [download](https://github.com/pukkandan/youtube-dl/archive/master.zip) this repository and run it with `python youtube_dl/__main__.py <args>`. Alternatively, you can install the fork using `pip install --upgrade https://github.com/pukkandan/youtube-dl/archive/master.zip` and run it with `python -m youtube_dl <args>`.
-
-In order to update, simply repeat the process.
--->
-
-
-
-
-# YOUTUBE-DLC
-
-[![Build Status](https://travis-ci.com/blackjack4494/yt-dlc.svg?branch=master)](https://travis-ci.com/blackjack4494/yt-dlc)
-[![PyPi](https://img.shields.io/pypi/v/youtube-dlc.svg)](https://pypi.org/project/youtube-dlc)
-
-[![Gitter chat](https://img.shields.io/gitter/room/youtube-dlc/community)](https://gitter.im/youtube-dlc)
-[![License: Unlicense](https://img.shields.io/badge/license-Unlicense-blue.svg)](https://github.com/blackjack4494/yt-dlc/blob/master/LICENSE)
-
-youtube-dlc - download videos from youtube.com or other video platforms.
-
-youtube-dlc is a fork of youtube-dl with the intention of getting features tested by the community merged in the tool faster, since youtube-dl's development seems to be slowing down. (https://web.archive.org/web/20201014194602/https://github.com/ytdl-org/youtube-dl/issues/26462)
-
-
-### INSTALLATION
-[How to update](#update)
-
-**All Platforms**
-Preferred way using pip:
-You may want to use `python3` instead of `python`
-
- python -m pip install --upgrade youtube-dlc
+To use the latest version, simply download and run the [latest release](https://github.com/pukkandan/yt-dlc/releases/latest).
+Currently, there is no support for any package managers.
If you want to install the current master branch
- python -m pip install git+https://github.com/blackjack4494/yt-dlc
-
-**UNIX** (Linux, macOS, etc.)
-Using wget:
-
- sudo wget https://github.com/blackjack4494/yt-dlc/releases/latest/download/youtube-dlc -O /usr/local/bin/youtube-dlc
- sudo chmod a+rx /usr/local/bin/youtube-dlc
-
-Using curl:
-
- sudo curl -L https://github.com/blackjack4494/yt-dlc/releases/latest/download/youtube-dlc -o /usr/local/bin/youtube-dlc
- sudo chmod a+rx /usr/local/bin/youtube-dlc
+ python -m pip install git+https://github.com/pukkandan/yt-dlc
+### UPDATE
+**DO NOT UPDATE using `-U` !** instead download binaries again
-**Windows** users can download [youtube-dlc.exe](https://github.com/blackjack4494/yt-dlc/releases/latest/download/youtube-dlc.exe) (**do not** put in `C:\Windows\System32`!).
+### COMPILE
-**Compile**
+**For Windows**:
To build the Windows executable yourself (without version info!)
python -m pip install --upgrade pyinstaller
New way to build Windows is to use `python pyinst.py` (please use python3 64Bit)
For 32Bit Version use a 32Bit Version of python (3 preferred here as well) and run `python pyinst32.py`
-For Unix:
+**For Unix**:
You will need the required build tools
python, make (GNU), pandoc, zip, nosetests
Then simply type this
make
-### UPDATE
-**DO NOT UPDATE using `-U` !** instead download binaries again or when installed with pip use a described above when installing.
-I will add some memorable short links to the binaries so you can download them easier.
-
-
-
-
-
# DESCRIPTION
**youtube-dlc** is a command-line program to download videos from YouTube.com and a few more sites. It requires the Python interpreter, version 2.6, 2.7, or 3.2+, and it is not platform specific. It should work on your Unix box, on Windows or on macOS. It is released to the public domain, which means you can modify it, redistribute it or use it however you like.
youtube-dlc [OPTIONS] URL [URL...]
+
# OPTIONS
`Ctrl+F` is your friend :D
+<!-- Autogenerated -->
+## General Options:
-h, --help Print this help text and exit
--version Print program version and exit
- -U, --update (Doesn't work since there is no release)
- Update this program to latest version. Make
- sure that you have sufficient permissions
- (run with sudo if needed)
-
+ -U, --update [BROKEN] Update this program to latest
+ version. Make sure that you have sufficient
+ permissions (run with sudo if needed)
-i, --ignore-errors Continue on download errors, for example to
skip unavailable videos in a playlist
(default) (Same as --no-abort-on-error)
--flat-videos Do not resolve the video urls
--no-flat-playlist Extract the videos of a playlist
--mark-watched Mark videos watched (YouTube only)
- --no-mark-watched Do not mark videos watched (YouTube only)
+ --no-mark-watched Do not mark videos watched
--no-color Do not emit color codes in output
## Network Options:
The date can be "YYYYMMDD" or in the format
"(now|today)[+-][0-9](day|week|month|year)(s)?"
--datebefore DATE Download only videos uploaded on or before
- this date (i.e. inclusive). The date formats
- accepted is the same as --date
+ this date. The date formats accepted is the
+ same as --date
--dateafter DATE Download only videos uploaded on or after
- this date (i.e. inclusive). The date formats
- accepted is the same as --date
+ this date. The date formats accepted is the
+ same as --date
--min-views COUNT Do not download any videos with less than
COUNT views
--max-views COUNT Do not download any videos with more than
service), but who also have a description,
use --match-filter "like_count > 100 &
dislike_count <? 50 & description" .
- --no-match-filter FILTER Do not use generic video filter (default)
+ --no-match-filter Do not use generic video filter (default)
--no-playlist Download only the video, if the URL refers
to a video and a playlist.
--yes-playlist Download the playlist, if the URL refers to
--download-archive FILE Download only videos not listed in the
archive file. Record the IDs of all
downloaded videos in it.
- --no-download-archive Do not use archive file (default)
--break-on-existing Stop the download process after attempting
to download a file that's in the archive.
- --include-ads Download advertisements as well (experimental)
+ --no-download-archive Do not use archive file (default)
+ --include-ads Download advertisements as well
+ (experimental)
--no-include-ads Do not download advertisements (default)
## Download Options:
(Same as --no-skip-unavailable-fragments)
--keep-fragments Keep downloaded fragments on disk after
downloading is finished
- --no-keep-fragments Delete downloaded fragments after downloading
- is finished (default)
+ --no-keep-fragments Delete downloaded fragments after
+ downloading is finished (default)
--buffer-size SIZE Size of download buffer (e.g. 1024 or 16K)
(default is 1024)
- --resize-buffer The buffer size is automatically resized from
- an initial value of --buffer-size (default)
- --no-resize-buffer Do not automatically adjust the buffer
- size
+ --resize-buffer The buffer size is automatically resized
+ from an initial value of --buffer-size
+ (default)
+ --no-resize-buffer Do not automatically adjust the buffer size
--http-chunk-size SIZE Size of a chunk for chunk-based HTTP
downloading (e.g. 10485760 or 10M) (default
is disabled). May be useful for bypassing
(experimental)
--playlist-reverse Download playlist videos in reverse order
--no-playlist-reverse Download playlist videos in default order
+ (default)
--playlist-random Download playlist videos in random order
--xattr-set-filesize Set file xattribute ytdl.filesize with
expected file size
with '#', ';' or ']' are considered as
comments and ignored.
-o, --output TEMPLATE Output filename template, see the "OUTPUT
- TEMPLATE" for all the info
+ TEMPLATE" for details
--autonumber-start NUMBER Specify the start value for %(autonumber)s
(default is 1)
--restrict-filenames Restrict filenames to only ASCII
characters, and avoid "&" and spaces in
filenames
- --no-restrict-filenames Allow Unicode characters, "&" and spaces
- in filenames (default)
+ --no-restrict-filenames Allow Unicode characters, "&" and spaces in
+ filenames (default)
-w, --no-overwrites Do not overwrite files
-c, --continue Resume partially downloaded files (default)
- --no-continue Do not resume partially downloaded files
- (restart from beginning)
- --part Use .part files instead of writing directly
+ --no-continue Restart download of partially downloaded
+ files from beginning
+ --part Use .part files instead of writing directly
into output file (default)
--no-part Do not use .part files - write directly
into output file
- --mtime Use the Last-modified header to set the
- file modification time
+ --mtime Use the Last-modified header to set the
+ file modification time (default)
--no-mtime Do not use the Last-modified header to set
the file modification time
--write-description Write video description to a .description
may change.
--no-cache-dir Disable filesystem caching
--rm-cache-dir Delete all filesystem cache files
- --trim-file-name Limit the filename length (extension
+ --trim-file-name LENGTH Limit the filename length (extension
excluded)
-## Thumbnail images:
+## Thumbnail Images:
--write-thumbnail Write thumbnail image to disk
--no-write-thumbnail Do not write thumbnail image to disk
+ (default)
--write-all-thumbnails Write all thumbnail image formats to disk
--list-thumbnails Simulate and list all available thumbnail
formats
-
## Internet Shortcut Options:
--write-link Write an internet shortcut file, depending on
the current platform (.url/.webloc/.desktop).
before each download (maximum possible
number of seconds to sleep). Must only be
used along with --min-sleep-interval.
- --sleep-subtitles Enforce sleep interval on subtitles as well.
-
+ --sleep-subtitles SECONDS Enforce sleep interval on subtitles as well
## Video Format Options:
-f, --format FORMAT Video format code, see "FORMAT SELECTION"
precedence over all fields, see "Sorting
Formats" for more details
--no-format-sort-force Some fields have precedence over the user
- specified sort order, see "Sorting Formats"
- for more details (default)
- --video-multistreams Allow multiple video streams to be merged into
- a single file
- --no-video-multistreams Only one video stream is downloaded for each
- output file (default)
- --audio-multistreams Allow multiple audio streams to be merged into
- a single file
- --no-audio-multistreams Only one audio stream is downloaded for each
- output file (default)
+ specified sort order (default), see
+ "Sorting Formats" for more details
+ --video-multistreams Allow multiple video streams to be merged
+ into a single file
+ --no-video-multistreams Only one video stream is downloaded for
+ each output file (default)
+ --audio-multistreams Allow multiple audio streams to be merged
+ into a single file
+ --no-audio-multistreams Only one audio stream is downloaded for
+ each output file (default)
--all-formats Download all available video formats
--prefer-free-formats Prefer free video formats unless a specific
one is requested
videos
--list-formats-as-table Present the output of -F in a more tabular
form (default)
- --list-formats-old Present the output of -F in older form
(Same as --no-list-formats-as-table)
- --youtube-skip-dash-manifest Do not download the DASH manifests and
- related data on YouTube videos
- (Same as --no-youtube-include-dash-manifest)
+ --list-formats-old Present the output of -F in the old form
--youtube-include-dash-manifest Download the DASH manifests and related data
on YouTube videos (default)
(Same as --no-youtube-skip-dash-manifest)
- --youtube-skip-hls-manifest Do not download the HLS manifests and
+ --youtube-skip-dash-manifest Do not download the DASH manifests and
related data on YouTube videos
- (Same as --no-youtube-include-hls-manifest)
+ (Same as --no-youtube-include-dash-manifest)
--youtube-include-hls-manifest Download the HLS manifests and related data
on YouTube videos (default)
(Same as --no-youtube-skip-hls-manifest)
+ --youtube-skip-hls-manifest Do not download the HLS manifests and
+ related data on YouTube videos
+ (Same as --no-youtube-include-hls-manifest)
--merge-output-format FORMAT If a merge is required (e.g.
bestvideo+bestaudio), output to given
container format. One of mkv, mp4, ogg,
webm, flv. Ignored if no merge is required
## Subtitle Options:
- --write-sub Write subtitle file
- --no-write-sub Do not write subtitle file (default)
- --write-auto-sub Write automatically generated subtitle file
+ --write-subs Write subtitle file
+ --no-write-subs Do not write subtitle file (default)
+ --write-auto-subs Write automatically generated subtitle file
(YouTube only)
- --no-write-auto-sub Do not write automatically generated
+ --no-write-auto-subs Do not write automatically generated
subtitle file (default)
--all-subs Download all the available subtitles of the
video
--ap-list-mso List all supported multiple-system
operators
-## Post-processing Options:
+## Post-Processing Options:
-x, --extract-audio Convert video files to audio-only files
(requires ffmpeg or avconv and ffprobe or
avprobe)
a value between 0 (better) and 9 (worse)
for VBR or a specific bitrate like 128K
(default 5)
- --remux-video FORMAT Remux the video to another container format
- if necessary (currently supported: mp4|mkv,
- target container format must support video
- / audio encoding, remuxing may fail)
- --recode-video FORMAT Encode the video to another format if
- necessary (currently supported:
- mp4|flv|ogg|webm|mkv|avi)
- --postprocessor-args ARGS Give these arguments to the postprocessor
- -k, --keep-video Keep the intermediate video file on disk
+ --remux-video FORMAT Remux the video into another container if
+ necessary (currently supported: mp4|mkv).
+ If target container does not support the
+ video/audio codec, remuxing will fail
+ --recode-video FORMAT Re-encode the video into another format if
+ re-encoding is necessary (currently
+ supported: mp4|flv|ogg|webm|mkv|avi)
+ --postprocessor-args NAME:ARGS Give these arguments to the postprocessors.
+ Specify the postprocessor name and the
+ arguments separated by a colon ':' to give
+ the argument to only the specified
+ postprocessor. Supported names are
+ ExtractAudio, VideoRemuxer, VideoConvertor,
+ EmbedSubtitle, Metadata, Merger,
+ FixupStretched, FixupM4a, FixupM3u8,
+ SubtitlesConvertor, SponSkrub and Default.
+ You can use this option multiple times to
+ give different arguments to different
+ postprocessors
+ -k, --keep-video Keep the intermediate video file on disk
after post-processing
- --no-keep-video Delete the intermediate video file after
+ --no-keep-video Delete the intermediate video file after
post-processing (default)
--post-overwrites Overwrite post-processed files (default)
--no-post-overwrites Do not overwrite post-processed files
--embed-subs Embed subtitles in the video (only for mp4,
webm and mkv videos)
- --no-embed-subs Do not embed subtitles in the video (default)
+ --no-embed-subs Do not embed subtitles (default)
--embed-thumbnail Embed thumbnail in the audio as cover art
--no-embed-thumbnail Do not embed thumbnail (default)
--add-metadata Write metadata to the video file
--convert-subs FORMAT Convert the subtitles to other format
(currently supported: srt|ass|vtt|lrc)
-## SponSkrub Options (SponsorBlock)
- --sponskrub Use sponskrub to mark sponsored sections with
- the data available in SponsorBlock API. This
- is enabled by default if the sponskrub binary
- exists (Youtube only)
+## [SponSkrub](https://github.com/faissaloo/SponSkrub) Options ([SponsorBlock](https://sponsor.ajay.app)):
+ --sponskrub Use sponskrub to mark sponsored sections
+ with the data available in SponsorBlock
+ API. This is enabled by default if the
+ sponskrub binary exists (Youtube only)
+ --no-sponskrub Do not use sponskrub
--sponskrub-cut Cut out the sponsor sections instead of
simply marking them
--no-sponskrub-cut Simply mark the sponsor sections, not cut
them out (default)
- --sponskrub-force Allow cutting out the sponsor sections even
- if the video was already downloaded.
+ --sponskrub-force Run sponskrub even if the video was already
+ downloaded
--no-sponskrub-force Do not cut out the sponsor sections if the
video was already downloaded (default)
- --sponskrub-location Location of the sponskrub binary;
- either the path to the binary or its
- containing directory
- --sponskrub-args Give these arguments to sponskrub
+ --sponskrub-location PATH Location of the sponskrub binary; either
+ the path to the binary or its containing
+ directory.
+ --sponskrub-args None Give these arguments to sponskrub
## Extractor Options:
--ignore-dynamic-mpd Do not process dynamic DASH manifests
- `channel_id` (string): Id of the channel
- `location` (string): Physical location where the video was filmed
- `duration` (numeric): Length of the video in seconds
+ - `duration_string` (string): Length of the video (HH-mm-ss)
- `view_count` (numeric): How many users have watched the video on the platform
- `like_count` (numeric): Number of positive ratings of the video
- `dislike_count` (numeric): Number of negative ratings of the video
- `b*`, `best*`: Select the best quality format irrespective of whether it contains video or audio.
- `w*`, `worst*`: Select the worst quality format irrespective of whether it contains video or audio.
-
- `b`, `best`: Select the best quality format that contains both video and audio. Equivalent to `best*[vcodec!=none][acodec!=none]`
- `w`, `worst`: Select the worst quality format that contains both video and audio. Equivalent to `worst*[vcodec!=none][acodec!=none]`
-
- `bv`, `bestvideo`: Select the best quality video-only format. Equivalent to `best*[acodec=none]`
- `wv`, `worstvideo`: Select the worst quality video-only format. Equivalent to `worst*[acodec=none]`
-
- `bv*`, `bestvideo*`: Select the best quality format that contains video. It may also contain audio. Equivalent to `best*[vcodec!=none]`
- `wv*`, `worstvideo*`: Select the worst quality format that contains video. It may also contain audio. Equivalent to `worst*[vcodec!=none]`
-
- `ba`, `bestaudio`: Select the best quality audio-only format. Equivalent to `best*[vcodec=none]`
- `wa`, `worstaudio`: Select the worst quality audio-only format. Equivalent to `worst*[vcodec=none]`
-
- `ba*`, `bestaudio*`: Select the best quality format that contains audio. It may also contain video. Equivalent to `best*[acodec!=none]`
- `wa*`, `worstaudio*`: Select the worst quality format that contains audio. It may also contain video. Equivalent to `worst*[acodec!=none]`
- `vcodec`, `video_codec`: Video Codec (`vp9` > `h265` > `h264` > `vp8` > `h263` > `theora` > other > unknown)
- `acodec`, `audio_codec`: Audio Codec (`opus` > `vorbis` > `aac` > `mp4a` > `mp3` > `ac3` > `dts` > other > unknown)
- `codec`: Equivalent to `vcodec,acodec`
- - `vext`, `video_ext`: Video Extension (`mp4` > `flv` > `webm` > other > unknown). If `--prefer-free-formats` is used, `webm` is prefered.
+ - `vext`, `video_ext`: Video Extension (`mp4` > `webm` > `flv` > other > unknown). If `--prefer-free-formats` is used, `webm` is prefered.
- `aext`, `audio_ext`: Audio Extension (`m4a` > `aac` > `mp3` > `ogg` > `opus` > `webm` > other > unknown). If `--prefer-free-formats` is used, the order changes to `opus` > `ogg` > `webm` > `m4a` > `mp3` > `aac`.
- `ext`, `extension`: Equivalent to `vext,aext`
- `filesize`: Exact filesize, if know in advance. This will be unavailable for mu38 and DASH formats.