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diff --git a/doc/demuxers.texi b/doc/demuxers.texi index c3049ddfc4..a7af1c8d08 100644 --- a/doc/demuxers.texi +++ b/doc/demuxers.texi @@ -1,10 +1,10 @@ @chapter Demuxers @c man begin DEMUXERS -Demuxers are configured elements in Libav which allow to read the +Demuxers are configured elements in FFmpeg which allow to read the multimedia streams from a particular type of file. -When you configure your Libav build, all the supported demuxers +When you configure your FFmpeg build, all the supported demuxers are enabled by default. You can list all available ones using the configure option "--list-demuxers". @@ -49,19 +49,19 @@ sequence of filenames of the form @file{i%m%g-1.jpg}, The size, the pixel format, and the format of each image must be the same for all the files in the sequence. -The following example shows how to use @command{avconv} for creating a +The following example shows how to use @command{ffmpeg} for creating a video from the images in the file sequence @file{img-001.jpeg}, -@file{img-002.jpeg}, ..., assuming an input framerate of 10 frames per +@file{img-002.jpeg}, ..., assuming an input frame rate of 10 frames per second: @example -avconv -i 'img-%03d.jpeg' -r 10 out.mkv +ffmpeg -i 'img-%03d.jpeg' -r 10 out.mkv @end example Note that the pattern must not necessarily contain "%d" or "%0@var{N}d", for example to convert a single image file @file{img.jpeg} you can employ the command: @example -avconv -i img.jpeg img.png +ffmpeg -i img.jpeg img.png @end example @section applehttp @@ -70,9 +70,39 @@ Apple HTTP Live Streaming demuxer. This demuxer presents all AVStreams from all variant streams. The id field is set to the bitrate variant index number. By setting -the discard flags on AVStreams (by pressing 'a' or 'v' in avplay), +the discard flags on AVStreams (by pressing 'a' or 'v' in ffplay), the caller can decide which variant streams to actually receive. The total bitrate of the variant that the stream belongs to is available in a metadata key named "variant_bitrate". +@section sbg + +SBaGen script demuxer. + +This demuxer reads the script language used by SBaGen +@url{http://uazu.net/sbagen/} to generate binaural beats sessions. A SBG +script looks like that: +@example +-SE +a: 300-2.5/3 440+4.5/0 +b: 300-2.5/0 440+4.5/3 +off: - +NOW == a ++0:07:00 == b ++0:14:00 == a ++0:21:00 == b ++0:30:00 off +@end example + +A SBG script can mix absolute and relative timestamps. If the script uses +either only absolute timestamps (including the script start time) or only +relative ones, then its layout is fixed, and the conversion is +straightforward. On the other hand, if the script mixes both kind of +timestamps, then the @var{NOW} reference for relative timestamps will be +taken from the current time of day at the time the script is read, and the +script layout will be frozen according to that reference. That means that if +the script is directly played, the actual times will match the absolute +timestamps up to the sound controller's clock accuracy, but if the user +somehow pauses the playback or seeks, all times will be shifted accordingly. + @c man end INPUT DEVICES |