tcdemux - Online in the Cloud

PROGRAM:

NAME

tcdemux - demultiplex a program stream

SYNOPSIS

tcdemux
-i name [ -t magic ] [ -x codec ] [ -S unit,[s1-s2] ] [ -a ach,[vch] ] [ -s 0xnn ]
[ -M mode ] [ -f fps ] [ -W ] [ -O ] [ -P name ] [ -A n[,m[,...]] ] [ -d verbosity
] [ -v ]

COPYRIGHT

tcdemux is Copyright (C) by Thomas Oestreich.

DESCRIPTION

tcdemux is part of and usually called by transcode.
However, it can also be used independently.
tcdemux reads source (from stdin if not explicitely defined) and prints on the standard
output.

OPTIONS

-i name
Specify input source. If ommited, stdin is assumed.

-x codec
Process only packets containing given codec as payload. Examples are "mpeg2" for
MPEG video or "ac3" for audio packets.

-t magic
Specify the input file type magic. Useful for using tcdemux in pipelines. This is
normally autodetected.

-a ach[,vch]
Process only packets containing given audio track ach and video track vch. Most
program stream feature multiple audio tracks but only a single video stream.
Default is "-a 0,0".

-s 0xnn
Select specific multimedia track using the standard identifier 0xnn. This useful
to extract subtitle packets.

-f fps Specify the frame rate fps for subtitle meta information used by external
applications.

-S unit[,s1-s2]
Select a program unit unit and a selected GOP range s1-s2 for processing. A unit is
usually a set of GOPs that need to be synchronized at the very beginning. This
option can be used to eleminate junk units at the beginning of the main
presentation or to select certain episodes of a TV series from a DVD. A GOP is a
logical unit to be properly decoded, i.e., decoding can only start at the beginning
of a GOP.

-O Do not skip initial sequence. Used internally by transcode.

-A n[,m[,...]]
Select packets using an identifier for extracting only selected streams without
processing. This is useful for size reduction of your multimedia stream. Example:

tcdemux -i big_dvd.vob -A 0xe0,0x81,0x20 > small_dvd.vob

extracts all packets for the video stream, AC3 audio track (1) and the first
subtitle stream (0).

-M mode
Select synchronization strategy mode. This is how transcode selects the beginning
of a video and audio stream to assure both streams are sychronized for further
processing:

0 no synchronization. Packets are printed directly to stdout.

1 synchronization based on PTS information found in the packet header. Audio
packets are delayed until a suitable starting point is found. Default for PAL
videos.

2 NTSC adapted synchronization mode. Detailed information for each GOP contained
in the video stream are piped to a stdout to be processed by the certain import
modules. This enables adjusting the frame rate or inverse telecine, if necessary.

3 more advanced synchronization mode 1 with msec granular adjustment. Details
delegated to transcode.

4 more advanced synchronization mode 2 with msec granular adjustment for NTSC
materail. Details delegated to transcode.

5-7 undocumented debugging modes for internal use.

-P file
Write GOP meta information to file instead of tdout.

-W Print a navigation log file for a given video stream to stdout. This is used for
transcode's "psu mode" and "cluster mode".

-d level
With this option you can specify a bitmask to enable different levels of verbosity
(if supported). You can combine several levels by adding the corresponding values:

QUIET 0

INFO 1

DEBUG 2

STATS 4

WATCH 8

FLIST 16

VIDCORE 32

SYNC 64

COUNTER 128

PRIVATE 256

-v Print version information and exit.

NOTES

tcdemux is a front end for de-multiplexing program streams and is used in transcode's
import modules.

EXAMPLES

The command

tcprobe -i movie.vob -x mpeg2

extracts only MPEG video packets. Further processing, i.e., extracting the elementary
video stream is done by tcextract.

AUTHORS

tcdemux was written by Thomas Oestreich
<[email protected]> with contributions from many others. See
AUTHORS for details.

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