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tcexport(1)		    General Commands Manual		   tcexport(1)

NAME
       tcexport	- Simple frontend to transcode's encoding subsystem

SYNOPSIS
       tcexport	[ -i video_file	] [ -p audio_file ] [ -o output_file ] [ -c
       f1-f2[,f3-f4[,...]]  ] [	-N fmt,fmt ] [ -R n[,video_log[,audio_log]] ]
       [ -P profile[,profile] ]	[ -y video_mod,audio_mod,mplex_mod ] [ -w bi-
       trate[,keyint[,crisp]] ]	[ -b bitrate[,vbr[,quality[,mode]]] ] [	-D ] [
       -d verbosity ] [	-m path	] [ -v ]

COPYRIGHT
       tcexport	is Copyright (C) by Francesco Romani

DESCRIPTION
       tcexport	was designed as	a debug	tool for transcode's encoding code: it
       fits in a very limited range of usage cases; however, it	can also be
       used independently if you like.
       tcexport	encodes	and multiplexes	a raw YUV4MPEG2/WAV V/A	stream using
       given parameters	and transcode encoder components. tecexport provides
       direct and complete access to transcode's encoding features and mod-
       ules, but hasn't	any of transcode import/extracting/decoding/filtering
       capabilities. Use some other tc*	tool if	you need those facilities.
       tcexport's options are intentionally made similar, or identical if fea-
       sible, to corresponding transcode's encoding options.

OPTIONS
       -i video_file
	      Specify the path of video	source.	 Only regular files on
	      filesystem are supported.	 video_file must be a YUV4MPEG2
	      stream, nothing else is supported.

       -p audio_file
	      Specify the path of audio	source.	 Only regular files on
	      filesystem are supported.	 audio_file must be a WAVE stream,
	      nothing else is supported.

       -o output_file
	      Specify the (base)path of	output file. Some multiplexors (es:
	      raw multiplexor) uses value of this option as an hint to make
	      the final	 output	file(s)	(i.e.  appending different extensions
	      for A/V streams).

       -c f1-f2[,f3-f4[, ... ] ]
	      encode only frames f1-f2 [and f3-f4 and so on].  Default is to
	      encode all available frames.  Use	this and you will get statis-
	      tics about remaining encoding time.  The f[N] parameters may
	      also be timecodes	in the HH:MM:SS.FRAME format. Example:
	      -c 500-0:5:01,:10:20-1:18:02.1

		     Will encode only from frame 500 to	5 minutes and 1	second
		     and from 10 min, 20 sec to	1 hour,	18 min,	2 sec and one
		     frame.

	      Note that	tcexport, ad well as transcode,	starts counting	frames
	      at 0 and excludes	the last frame specified.  That	means that "-c
	      0-100" will encoded 100 frames starting at frame 0 up to frame
	      99

       -N video_format,audio_format
	      Setup the	desired	encoded	video and audio	format respectively.
	      You must always use this option since there is some encoder mod-
	      ules (notably encode_ffmpeg) that	support	a lot of codecs, and
	      tcexport nor modules can automatically choose a sane one not
	      have defaults (yet).

       -R n[,video_log[,audio_log]]
	      enable multi-pass	encoding (0-3) [0,divx4.log,pcm.log].

	      0	Constant bitrate (CBR) encoding. [default]
		  The codec tries to achieve constant bitrate output. This
		  means, each encoded frame is mostly the same size. This type
		  of encoding can help in maintaining constant filling of
		  hardware buffer on set top players or	smooth streaming over
		  networks. By the way,	Constant bitrate is often obtained
		  sacrifying quality during high motion	scenes.

	      1	Variable bitrate encoding: First pass.
		  In this mode,	the codec analyses the complete	sequence in
		  order	to collect data	that can improve the distribution of
		  bits in a second VBR pass. The collected data	is written to
		  second sub argument (default:	divx4.log). This data is codec
		  dependant and	cannot be used across codecs. It is strongly
		  advised to use the same codec	settings for the VBR analysis
		  pass and the VBR encoding pass if you	want predictable re-
		  sults.

		  The video output of the first	pass is	not of much use	and
		  can grow very	large.	It's a good idea to not	save the video
		  output to a file but directly	to /dev/null.  Usually the bi-
		  trate	is ignored during first	pass.  Disabling audio export
		  makes	sense too, so use -y.

	      2	Variable bitrate encoding: Second pass.
		  The first pass allowed the codec collecting data about the
		  complete sequence.  During the second	pass, the codec	will
		  use that data	in order to find an efficient bit distribution
		  that respects	both the desired bitrate and the natural bi-
		  trate	curve shape. This ensures a good compromise between
		  quality and desired bitrate.

	      3	Constant quantizer encoding.
		  The quantizer	is the "compression level" of the picture. The
		  lower	the quantizer is, the higher is	the quality of the
		  picture. This	mode can help in making	sure the sequence is
		  encoded at constant quality, but no prediction can be	made
		  on the final bitrate.	When using this	mode, the -w option
		  changes its meaning, it now takes the	quantizer ranging from
		  1 to 31. Note	that constant quantizer	encoding is not	sup-
		  ported with some codecs (notably mpeg1/2/4 with -y ffmpeg).

       -P profile[,profile]
	      select export profile(s) to load.	An export profile it's just a
	      different, already tuned,	set of basic values for	tcexport's op-
	      tions. Even if isn't recomended, an user can always overwrite
	      profile settings just using standard options.  export profiles
	      are stackable, just requesting to	load multiple profiles sepa-
	      rated by commas; if some options are set by more than one	pro-
	      file, the	last profile determine their value.

       -y video_mod,audio_mod,mplex_mod
	      Select export modules: video and audio encoders, and multiplexor
	      module.  You always must select both the encoders	and multi-
	      plexor, there isn't implicit modules. The	only exception to this
	      rule is if this option isn't used	at all:	in this	case tcexport
	      will use null modules.

       -w bitrate[,keyint[,crisp]]
	      encoder bitrate[,keyframes[,crispness]] [(6000 for MPEG 1/2,
	      1800 for others),250,100].

       -b bitrate[,vbr[,quality[,mode]]]
	      audio encoder bitrate kBits/s[,vbr[,quality[,mode]]] [128,0,5,0]

       -D     Select dry run mode: tcexport will probe stream, load selected
	      modules then exit, without doing anything	else.

       -d verbosity
	      Select the verbosity of program, support code and	modules. See
	      transcode's manpage to see supported verbosity levels. Please
	      note that	higher verbosity levels	include	lower ones, so if You
	      select i.e. TC_DEBUG level you will get TC_DEBUG messages	and
	      TC_INFO messages.	Please also note that high verbosity levels
	      will output a lot	of messages.

       -m path
	      Look in Path instead of the compiled-in module path for a	mod-
	      ule.

       -v     Print version information	and exit.

RETURN VALUES
       tcexport	uses following return values:
	0  successfull
	1  bad parameter or command line option
	2  error while reading/writing from/to a file
	3  requested an	inexistent (or unreadable) module
	4  a module raised an internal error
	5  error while probing input file(s). Make sure	they are of right for-
       mat.
       64  internal error. Please provide a report of what's happened on
       transcode-devel mailing list

AUTHORS
       tcexport	was written by Francesco Romani
       <fromani@gmail.com> with	contributions from the Transcode Team and many
       others.	See AUTHORS for	details.

SEE ALSO
       tccat(1), tcdecode(1), tcdemux(1), tcextract(1),	tcprobe(1),
       transcode(1) tcmodinfo(1)

tcexport(1)			 9 April 2006			   tcexport(1)

NAME | SYNOPSIS | COPYRIGHT | DESCRIPTION | OPTIONS | RETURN VALUES | AUTHORS | SEE ALSO

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