+.SH FORMAT SELECTION
+.PP
+By default youtube\-dl tries to download the best available quality,
+i.e.
+if you want the best quality you \f[B]don\[aq]t need\f[] to pass any
+special options, youtube\-dl will guess it for you by \f[B]default\f[].
+.PP
+But sometimes you may want to download in a different format, for
+example when you are on a slow or intermittent connection.
+The key mechanism for achieving this is so\-called \f[I]format
+selection\f[] based on which you can explicitly specify desired format,
+select formats based on some criterion or criteria, setup precedence and
+much more.
+.PP
+The general syntax for format selection is \f[C]\-\-format\ FORMAT\f[]
+or shorter \f[C]\-f\ FORMAT\f[] where \f[C]FORMAT\f[] is a \f[I]selector
+expression\f[], i.e.
+an expression that describes format or formats you would like to
+download.
+.PP
+\f[B]tl;dr:\f[] navigate me to examples.
+.PP
+The simplest case is requesting a specific format, for example with
+\f[C]\-f\ 22\f[] you can download the format with format code equal to
+22.
+You can get the list of available format codes for particular video
+using \f[C]\-\-list\-formats\f[] or \f[C]\-F\f[].
+Note that these format codes are extractor specific.
+.PP
+You can also use a file extension (currently \f[C]3gp\f[], \f[C]aac\f[],
+\f[C]flv\f[], \f[C]m4a\f[], \f[C]mp3\f[], \f[C]mp4\f[], \f[C]ogg\f[],
+\f[C]wav\f[], \f[C]webm\f[] are supported) to download the best quality
+format of a particular file extension served as a single file, e.g.
+\f[C]\-f\ webm\f[] will download the best quality format with the
+\f[C]webm\f[] extension served as a single file.
+.PP
+You can also use special names to select particular edge case formats:
+\- \f[C]best\f[]: Select the best quality format represented by a single
+file with video and audio.
+\- \f[C]worst\f[]: Select the worst quality format represented by a
+single file with video and audio.
+\- \f[C]bestvideo\f[]: Select the best quality video\-only format (e.g.
+DASH video).
+May not be available.
+\- \f[C]worstvideo\f[]: Select the worst quality video\-only format.
+May not be available.
+\- \f[C]bestaudio\f[]: Select the best quality audio only\-format.
+May not be available.
+\- \f[C]worstaudio\f[]: Select the worst quality audio only\-format.
+May not be available.
+.PP
+For example, to download the worst quality video\-only format you can
+use \f[C]\-f\ worstvideo\f[].
+.PP
+If you want to download multiple videos and they don\[aq]t have the same
+formats available, you can specify the order of preference using
+slashes.
+Note that slash is left\-associative, i.e.
+formats on the left hand side are preferred, for example
+\f[C]\-f\ 22/17/18\f[] will download format 22 if it\[aq]s available,
+otherwise it will download format 17 if it\[aq]s available, otherwise it
+will download format 18 if it\[aq]s available, otherwise it will
+complain that no suitable formats are available for download.
+.PP
+If you want to download several formats of the same video use a comma as
+a separator, e.g.
+\f[C]\-f\ 22,17,18\f[] will download all these three formats, of course
+if they are available.
+Or a more sophisticated example combined with the precedence feature:
+\f[C]\-f\ 136/137/mp4/bestvideo,140/m4a/bestaudio\f[].
+.PP
+You can also filter the video formats by putting a condition in
+brackets, as in \f[C]\-f\ "best[height=720]"\f[] (or
+\f[C]\-f\ "[filesize>10M]"\f[]).
+.PP
+The following numeric meta fields can be used with comparisons
+\f[C]<\f[], \f[C]<=\f[], \f[C]>\f[], \f[C]>=\f[], \f[C]=\f[] (equals),
+\f[C]!=\f[] (not equals): \- \f[C]filesize\f[]: The number of bytes, if
+known in advance \- \f[C]width\f[]: Width of the video, if known \-
+\f[C]height\f[]: Height of the video, if known \- \f[C]tbr\f[]: Average
+bitrate of audio and video in KBit/s \- \f[C]abr\f[]: Average audio
+bitrate in KBit/s \- \f[C]vbr\f[]: Average video bitrate in KBit/s \-
+\f[C]asr\f[]: Audio sampling rate in Hertz \- \f[C]fps\f[]: Frame rate
+.PP
+Also filtering work for comparisons \f[C]=\f[] (equals), \f[C]!=\f[]
+(not equals), \f[C]^=\f[] (begins with), \f[C]$=\f[] (ends with),
+\f[C]*=\f[] (contains) and following string meta fields: \-
+\f[C]ext\f[]: File extension \- \f[C]acodec\f[]: Name of the audio codec
+in use \- \f[C]vcodec\f[]: Name of the video codec in use \-
+\f[C]container\f[]: Name of the container format \- \f[C]protocol\f[]:
+The protocol that will be used for the actual download, lower\-case
+(\f[C]http\f[], \f[C]https\f[], \f[C]rtsp\f[], \f[C]rtmp\f[],
+\f[C]rtmpe\f[], \f[C]mms\f[], \f[C]f4m\f[], \f[C]ism\f[],
+\f[C]http_dash_segments\f[], \f[C]m3u8\f[], or \f[C]m3u8_native\f[]) \-
+\f[C]format_id\f[]: A short description of the format
+.PP
+Note that none of the aforementioned meta fields are guaranteed to be
+present since this solely depends on the metadata obtained by particular
+extractor, i.e.
+the metadata offered by the video hoster.
+.PP
+Formats for which the value is not known are excluded unless you put a
+question mark (\f[C]?\f[]) after the operator.
+You can combine format filters, so
+\f[C]\-f\ "[height\ <=?\ 720][tbr>500]"\f[] selects up to 720p videos
+(or videos where the height is not known) with a bitrate of at least 500
+KBit/s.
+.PP
+You can merge the video and audio of two formats into a single file
+using \f[C]\-f\ <video\-format>+<audio\-format>\f[] (requires ffmpeg or
+avconv installed), for example \f[C]\-f\ bestvideo+bestaudio\f[] will
+download the best video\-only format, the best audio\-only format and
+mux them together with ffmpeg/avconv.
+.PP
+Format selectors can also be grouped using parentheses, for example if
+you want to download the best mp4 and webm formats with a height lower
+than 480 you can use \f[C]\-f\ \[aq](mp4,webm)[height<480]\[aq]\f[].
+.PP
+Since the end of April 2015 and version 2015.04.26, youtube\-dl uses
+\f[C]\-f\ bestvideo+bestaudio/best\f[] as the default format selection
+(see #5447 (https://github.com/rg3/youtube-dl/issues/5447),
+#5456 (https://github.com/rg3/youtube-dl/issues/5456)).
+If ffmpeg or avconv are installed this results in downloading
+\f[C]bestvideo\f[] and \f[C]bestaudio\f[] separately and muxing them
+together into a single file giving the best overall quality available.
+Otherwise it falls back to \f[C]best\f[] and results in downloading the
+best available quality served as a single file.
+\f[C]best\f[] is also needed for videos that don\[aq]t come from YouTube
+because they don\[aq]t provide the audio and video in two different
+files.
+If you want to only download some DASH formats (for example if you are
+not interested in getting videos with a resolution higher than 1080p),
+you can add \f[C]\-f\ bestvideo[height<=?1080]+bestaudio/best\f[] to
+your configuration file.
+Note that if you use youtube\-dl to stream to \f[C]stdout\f[] (and most
+likely to pipe it to your media player then), i.e.
+you explicitly specify output template as \f[C]\-o\ \-\f[], youtube\-dl
+still uses \f[C]\-f\ best\f[] format selection in order to start content
+delivery immediately to your player and not to wait until
+\f[C]bestvideo\f[] and \f[C]bestaudio\f[] are downloaded and muxed.
+.PP
+If you want to preserve the old format selection behavior (prior to
+youtube\-dl 2015.04.26), i.e.
+you want to download the best available quality media served as a single
+file, you should explicitly specify your choice with \f[C]\-f\ best\f[].
+You may want to add it to the configuration file in order not to type it
+every time you run youtube\-dl.
+.SS Format selection examples
+.PP
+Note that on Windows you may need to use double quotes instead of
+single.
+.IP
+.nf
+\f[C]
+#\ Download\ best\ mp4\ format\ available\ or\ any\ other\ best\ if\ no\ mp4\ available
+$\ youtube\-dl\ \-f\ \[aq]bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best\[aq]
+
+#\ Download\ best\ format\ available\ but\ not\ better\ that\ 480p
+$\ youtube\-dl\ \-f\ \[aq]bestvideo[height<=480]+bestaudio/best[height<=480]\[aq]
+
+#\ Download\ best\ video\ only\ format\ but\ no\ bigger\ than\ 50\ MB
+$\ youtube\-dl\ \-f\ \[aq]best[filesize<50M]\[aq]
+
+#\ Download\ best\ format\ available\ via\ direct\ link\ over\ HTTP/HTTPS\ protocol
+$\ youtube\-dl\ \-f\ \[aq](bestvideo+bestaudio/best)[protocol^=http]\[aq]
+
+#\ Download\ the\ best\ video\ format\ and\ the\ best\ audio\ format\ without\ merging\ them
+$\ youtube\-dl\ \-f\ \[aq]bestvideo,bestaudio\[aq]\ \-o\ \[aq]%(title)s.f%(format_id)s.%(ext)s\[aq]
+\f[]
+.fi
+.PP
+Note that in the last example, an output template is recommended as
+bestvideo and bestaudio may have the same file name.
Rapsys Git / youtubedl / blobdiff