88 lines
2.9 KiB
ReStructuredText
88 lines
2.9 KiB
ReStructuredText
Stream descriptors
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^^^^^^^^^^^^^^^^^^
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There can be multiple *stream_descriptor* with input from the same "file" or
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multiple different "files".
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Stream descriptor is of the form::
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<field>=<value>[,<field>=<value>]...
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These are the available fields:
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:input (in):
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input/source media "file" path, which can be regular files, pipes, udp
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streams. See :doc:`/options/udp_file_options` on additional options for UDP
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files.
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:stream_selector (stream):
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Required field with value 'audio', 'video', 'text' or stream number (zero
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based).
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:output (out):
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Required output file path (single file).
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:init_segment:
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initialization segment path (multiple file).
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:segment_template (segment):
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Optional value which specifies the naming pattern for the segment files,
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and that the stream should be split into multiple files. Its presence should
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be consistent across streams. See
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:doc:`/options/segment_template_formatting`.
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:bandwidth (bw):
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Optional value which contains a user-specified maximum bit rate for the
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stream, in bits/sec. If specified, this value is propagated to (HLS)
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EXT-X-STREAM-INF:BANDWIDTH or (DASH) Representation@bandwidth and the
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$Bandwidth$ template parameter for segment names. If not specified, the
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bandwidth value is estimated from content bitrate. Note that it only affects
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the generated manifests/playlists; it has no effect on the media content
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itself.
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:language (lang):
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Optional value which contains a user-specified language tag. If specified,
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this value overrides any language metadata in the input stream.
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:output_format (format):
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Optional value which specifies the format of the output files (MP4 or WebM).
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If not specified, it will be derived from the file extension of the output
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file.
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For subtitles in MP4, you can specify 'vtt+mp4' or 'ttml+mp4' to control
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which text format is used.
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:trick_play_factor (tpf):
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Optional value which specifies the trick play, a.k.a. trick mode, stream
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sampling rate among key frames. If specified, the output is a trick play
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stream.
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:cc_index:
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Optional value which specifies the index/ID of the subtitle stream to use
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for formats where multiple exist within the same stream. For example,
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CEA allows specifying up to 4 streams within a single video stream. If not
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specified, all subtitles will be merged together.
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:forced_subtitle:
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Optional boolean value (0|1). If set to 1 indicates that this stream is a
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Forced Narrative subtitle that should be displayed when subtitles are otherwise
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off, for example used to caption short portions of the audio that might be in
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a foreign language. For DASH this will set role to **forced_subtitle**, for HLS
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it will set FORCED=YES and AUTOSELECT=YES. Only valid for subtitles.
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.. include:: /options/drm_stream_descriptors.rst
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.. include:: /options/dash_stream_descriptors.rst
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.. include:: /options/hls_stream_descriptors.rst
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