Stream descriptors

There can be multiple stream_descriptor with input from the same “file” or multiple different “files”.

Stream descriptor is of the form:

{field}={value}[,{field}={value}]...

These are the available fields:

input (in):input/source media “file” path, which can be regular files, pipes, udp streams. See UDP file options on additional options for UDP files. stream_selector (stream):  Required field with value ‘audio’, ‘video’, ‘text’ or stream number (zero based). output (out):Required output file path (single file). init_segment:initialization segment path (multiple file). segment_template (segment):  Optional value which specifies the naming pattern for the segment files, and that the stream should be split into multiple files. Its presence should be consistent across streams. See Segment template formatting. bandwidth (bw):Optional value which contains a user-specified content bit rate for the stream, in bits/sec. If specified, this value is propagated to (HLS) EXT-X-STREAM-INF:BANDWIDTH or (DASH) Representation@bandwidth and the $Bandwidth$ template parameter for segment names. If not specified, the bandwidth value is estimated from content bitrate. Note that it only affects the generated manifests/playlists; it has no effect on the media content itself. language (lang):  Optional value which contains a user-specified language tag. If specified, this value overrides any language metadata in the input stream. output_format (format):  Optional value which specifies the format of the output files (MP4 or WebM). If not specified, it will be derived from the file extension of the output file. trick_play_factor (tpf):  Optional value which specifies the trick play, a.k.a. trick mode, stream sampling rate among key frames. If specified, the output is a trick play stream.

DRM related Stream descriptor fields

skip_encryption=0|1:  Optional. Defaults to 0 if not specified. If it is set to 1, no encryption of the stream will be made. drm_label:Optional value for custom DRM label, which defines the encryption key applied to the stream. Typically values include AUDIO, SD, HD, UHD1, UHD2. For raw key, it should be a label defined in –keys. If not provided, the DRM label is derived from stream type (video, audio), resolutions, etc. Note that it is case sensitive.

HLS specific stream descriptor fields

hls_name:Used for HLS audio to set the NAME attribute for EXT-X-MEDIA. Defaults to the base of the playlist name. hls_group_id:Used for HLS audio to set the GROUP-ID attribute for EXT-X-MEDIA. Defaults to ‘audio’ if not specified. playlist_name:Used for HLS to name the playlist for the stream. Usually ends with ‘.m3u8’. If unspecified, defaults to something of the form ‘stream_0.m3u8’, ‘stream_1.m3u8’, ‘stream_2.m3u8’, etc.