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122 lines
4.4 KiB
ReStructuredText
122 lines
4.4 KiB
ReStructuredText
EDL files
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=========
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EDL files basically concatenate ranges of video/audio from multiple source
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files into a single continuous virtual file. Each such range is called a
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segment, and consists of source file, source offset, and segment length.
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For example::
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# mpv EDL v0
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f1.mkv,10,20
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f2.mkv
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f1.mkv,40,10
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This would skip the first 10 seconds of the file f1.mkv, then play the next
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20 seconds, then switch to the file f2.mkv and play all of it, then switch
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back to f1.mkv, skip to the 40 second mark, and play 10 seconds, and then
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stop playback. The difference to specifying the files directly on command
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line (and using ``--{ --start=10 --length=20 f1.mkv --}`` etc.) is that the
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virtual EDL file appears as a virtual timeline (like a single file), instead
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as a playlist.
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The general simplified syntax is::
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# mpv EDL v0
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<filename>
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<filename>,<start in seconds>,<length in seconds>
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If the start time is omitted, 0 is used. If the length is omitted, the
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estimated duration of the source file is used.
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Note::
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mpv can't use ordered chapter files or libquvi-resolved URLs in EDL
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entries. Usage of relative or absolute paths as well as any protocol
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prefixes is prevented for security reasons.
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Syntax of mpv EDL files
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=======================
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Generally, the format is relatively strict. No superfluous whitespace (except
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empty lines and commented lines) are allowed. You must use UNIX line breaks.
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The first line in the file must be ``# mpv EDL v0``. This designates that the
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file uses format version 0, which is not frozen yet and may change any time.
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(If you need a stable EDL file format, make a feature request. Likewise, if
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you have suggestions for improvements, it's not too late yet.)
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The rest of the lines belong to one of these classes:
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1) An empty or commented line. A comment starts with ``#``, which must be the
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first character in the line. The rest of the line (up until the next line
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break) is ignored. An empty line has 0 bytes between two line feed bytes.
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2) A segment entry in all other cases.
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Each segment entry consists of a list of named or unnamed parameters.
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Parameters are separated with ``,``. Named parameters consist of a name,
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followed by ``=``, followed by the value. Unnamed parameters have only a
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value, and the name is implicit from the parameter position.
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Syntax::
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segment_entry ::= <param> ( <param> ',' )*
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param ::= [ <name> '=' ] ( <value> | '%' <number> '%' <valuebytes> )
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The ``name`` string can consist of any characters, except ``=%,;\n``. The
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``value`` string can consist of any characters except of ``,;\n``.
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The construct starting with ``%`` allows defining any value with arbitrary
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contents inline, where ``number`` is an integer giving the number of bytes in
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``valuebytes``. If a parameter value contains disallowed characters, it has to
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be guarded by a length specifier using this syntax.
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The parameter name defines the meaning of the parameter:
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1) ``file``, the source file to use for this segment.
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2) ``start``, a time value that specifies the start offset into the source file.
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3) ``length``, a time value that specifies the length of the segment.
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See the section below for the format of timestamps.
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Unnamed parameters carry implicit names. The parameter position determines
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which of the parameters listed above is set. For example, the second parameter
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implicitly uses the name ``start``.
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Example::
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# mpv EDL v0
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%18%filename,with,.mkv,10,length=20,param3=%13%value,escaped,param4=value2
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this sets ``file`` to ``filename,with,.mkv``, ``start`` to ``10``, ``length``
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to ``20``, ``param3`` to ``value,escaped``, ``param4`` to ``value2``.
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Instead of line breaks, the character ``;`` can be used. Line feed bytes and
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``;`` are treated equally.
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Timestamp format
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================
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Currently, time values are floating point values in seconds.
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As an extension, you can set the ``timestamps=chapters`` option. If this option
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is set, timestamps have to be integers, and refer to chapter numbers, starting
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with 0.
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Example::
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# mpv EDL v0
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file.mkv,2,4,timestamps=chapters
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Plays chapter 3 and ends with the start of chapter 7 (4 chapters later).
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Syntax of EDL URIs
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==================
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mpv accepts inline EDL data in form of ``edl://`` URIs. Other than the
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header, the syntax is exactly the same. It's far more convenient to use ``;``
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instead of line breaks, but that is orthogonal.
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Example: ``edl://f1.mkv,length=5,start=10;f2.mkv,30,20;f3.mkv``
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