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CentOS 7.0 - man page for dvgrab (centos section 1)

DVGRAB(1)										DVGRAB(1)

       dvgrab -- Capture DV or MPEG-2 Transport Stream (HDV) video and audio data from FireWire

       dvgrab [options] [base] [-]

       dvgrab  is  a program that captures DV or HDV (MPEG2-TS) video and audio data from digital
       camcorders via FireWire (IEEE 1394).  The data is stored in one or several files  and  can
       later be processed by video editing software.  dvgrab can remote control the camcorder but
       it does not show the video's content on screen.

       dvgrab also supports UVC (USB Video Class) compliant DV devices using Linux kernel  module
       uvcvideo, which is a V4L2 driver. In this mode, there is no AV/C VTR control and therefore
       interactive mode is almost useless.  interactive feature is

       The base argument is used to construct the filename to  store  video  data:  base-num.ext.
       num  is	a running number starting from 001, and ext is the file name extension specifying
       the file format used, e.g. avi.	A different naming scheme is  used  whenever  the  -time-
       stamp,  -timecode, or -timesys is given (see below).  If base is a full filename including
       extension, then dvgrab attempts to determine the output file format  from  the  extension,
       but it still inserts num.  The default value for base is "dvgrab-".

       If  you specify a trailing '-' then the format is forced to raw DV or HDV and sent to std-
       out. dvgrab will also output raw DV or HDV to stdout while capturing to a file  if  stdout
       is piped or redirected.

       You  can  use dvgrab's powerful file writing capabilities with other programs that produce
       raw DV or HDV. Using the -stdin option and if dvgrab detects that it is on  the	receiving
       end of a pipe and it is not in interactive mode, then it will try to read raw DV or HDV on

       Options longer than a single character can be specified with either  one  or  two  leading
       hyphens. Also, you can use a space character or equal sign to separate the option name and
       its argument value.

       -a[num], -autosplit[=num]
		 Try to detect whenever a new recording starts, and  store  it	into  a  separate
		 file.	This  can  be  combined  with  the -frames and -size options, and a split
		 occurs whenever a specified event arises.  Autosplit is off by default.

		 num is optional. Without it, dvgrab determines when to split using a flag in the
		 stream  or a discontinuity in the timecode, where timecode discontinuity is any-
		 thing backwards or greater than one second.  If you set  the  optional  argument
		 num  you  can	set  the time sensitivity in seconds and ignore the stream's new-
		 recording flag. This basically lets you split on larger time increments such  as
		 minutes  or  hours.  For  example, -autosplit=3600 splits the recording whenever
		 there is a gap in the recording that is an hour or longer.

       -buffers num
		 The number of frames to use for buffering device I/O delays. Defaults to 100.

       -card num Tells dvgrab to receive data from FireWire card num. The default behaviour is to
		 automatically	select	the  first card containing the first discovered camera If
		 used in conjunction with -noavc, then no bus probing is  performed  If  used  in
		 conjunction  with -guid hex, then only the specified bus is probed for node with
		 guid hex.

       -channel num
		 Isochronous channel to receive data from. Defaults to 63, which is  pretty  much
		 standard  among  DV camcorders these days. If you specify anything different, no
		 attempt is made at this time to tell the device which channel to use.	You  must
		 have some manual way to tell the transmitting device which channel to use.

       -cmincutsize num
		 This option is used to start the collection if a cut occurs num megabytes (actu-
		 ally, mebibytes) prior to the end of the collection. This option  reduces  small
		 files	being  created	when  using  the  -csize option. When a new collection is
		 started in this manner, the amount of free space in the previous  collection  is
		 stored,  and  while  the following clips fit within the previous collection, the
		 new collection starting point is reset.

       -csize num
		 This option tells dvgrab to split the files when the collection of files exceeds
		 num . This option is used to create collections of files that fit perfectly into
		 num megabytes (actually, mebibytes) (i.e. for archiving  onto	DVD).  When  this
		 occurs, a new collection is started (See also the -cmincutsize option)

       -debug type
		 Display     HDV     debug     info,	 type	  is	 one	or    more    of:

       -d, -duration time
		 Set the maximum capture duration across all file splits  for  a  single  capture
		 session (multiple sessions are possible in interactive mode).	The time value is
		 expressed in SMIL2 MediaClipping Time format.	See http://w3.org/AudioVideo/ for
		 the specification.

		 Briefly, the formats are:

		 XXX[.Y]h, XXX[.Y]min, XXX[.Y][s], XXXms,

		 [[HH:]MM:]SS[.ms], or smpte=[[[HH:]MM:]SS:]FF.

       -every n  This option tells dvgrab to write every n'th frame only (default all frames).

       -f, -format dv1 | dv2 | avi | raw | dif | qt | mov | jpeg | jpg | mpeg2 | hdv
		 Specifies  the  format of the output file(s). File format can also be determined
		 if you include an extension on the base name. The following extensions are  rec-
		 ognizable: avi, dv, dif, mov, jpg, jpeg, and m2t (HDV).

		 dv1  and  dv2	both are AVI files with slightly different formats.  dv2 stores a
		 separate audio track in addition to the DV video track, which is more compatible
		 with  other  applications.   dv1 only stores a single, integrated DV track since
		 the DV format natively interleaves audio with video. Therefore, while	dv1  pro-
		 duces	smaller  output, some applications won't grok it and require dv2 instead.
		 dvgrab is capable of creating extremely large AVI files--well over 2 or  4  GB--
		 however, compatibility with other tools starts to decrease over the 1 GB size.

		 raw  stores the data unmodified and have the .dv extension. These files are read
		 by a number of GNU/Linux tools as well as Apple Quicktime.

		 dif is a variation of raw DV that names files with a .dif extension so they  can
		 be more immediately loaded into MainConcept MainActor5.

		 qt is Quicktime, but requires that dvgrab be compiled with libquicktime.

		 jpg  or  jpeg	is for a sequence of JPEG image files if dvgrab was compiled with
		 libdv and jpeglib. This option can only  be  used  with  a  DV  input,  not  HDV

		 mpeg2	or  hdv  is  for a MPEG-2 transport stream when using, for example, a HDV
		 camcorder or digital TV settop box.

		 Defaults to raw

       -F, -frames num
		 This option tells dvgrab to store at most num frames per file	before	splitting
		 to  a new file, where num = 0 means ulimited.	The corresponding time depends on
		 the video system used.  PAL shows 25, NTSC about 30 frames per second.

       -guid hex If you have more than one DV device, then select one using the node's GUID spec-
		 ified	in  hex  (hexadecimal)	format.  This  is  the	format	as  displayed  in
		 /proc/bus/ieee1394/devices or the new kernel 2.6 /sys filesystem. When you spec-
		 ify  a  GUID,	dvgrab will establish (or overlay) a peer-to-peer connection with
		 the device instead of listening to the device's broadcast.  If you supply a  hex
		 value of 1, then dvgrab attempts to discover the device as well as setup a peer-
		 to-peer connection. This is especially handy with MPEG2-TS settop  boxes,  which
		 typically require a connection management procedure to start transmitting.

       -h, -help Show summary of options.

       -I, -input file
		 Read  from  file instead of FireWire. You can use '-' for stdin instead of using

       -i, -interactive
		 Make dvgrab interactive where single keypresses on stdin control the camera  VTR
		 or  start  and  stop  capture.  Otherwise, dvgrab runs in session mode, where it
		 immediately starts capture and stops as directed or interrupted (ctrl-c).

		 If using -format jpeg, deinterlace the output by doubling the lines of the upper
		 field. This is a cheap form of deinterlace that results in an effective 50% loss
		 in resolution.

       -jpeg-height num
		 If using -format jpeg, scale the output of the height to num (1 - 2048).

       -jpeg-overwrite name
		 Write to same image file for each frame, instead of creating a sequence of image

       -jpeg-quality num
		 If using -format jpeg, set the JPEG quality level from 0 (worst) to 100 (best).

       -jpeg-temp name 10
		 Use a temporary file to create the jpeg, rename the file to the target file name
		 when done. Useful when using dvgrab with -jpeg-overwrite for generating a webcam

       -jpeg-width num
		 If using -format jpeg, scale the output of the width to num (1 - 2048).

		 The  JPEG scaling width and height must be both either less than or greater than
		 the normal frame size. For example, the scaled size of  700  wide  by	525  high
		 yields  a  nice  4:3 aspect image with square pixels, but it is illegal for NTSC
		 because 700 is less than the normal width of 720 while  the  height  is  greater
		 than the normal height of 480.

		 Since	DV  uses  non-square  pixels,  it is nice to be able to scale to an image
		 based upon a 4:3 aspect ratio using square pixels. For NTSC, example  sizes  are
		 800x600,  640x480,  and 320x240. For PAL, example square pixel sizes are 384x270
		 and 768x540.

       -jvc-p25  Remove repeat_first_field flag and set frames per second  to  25  to  correct	a
		 stream recorded in JVC's HDV P25 mode.

       -lockstep Align	capture  to  a multiple of -frames based on timecode.  This is useful for
		 redundancy, when more than one machine  is  capturing	from  the  same  FireWire
		 device,  and  you  want to ensure each file contains the same footage. To ensure
		 the files from each machine have the same name use the -timecode option and  the
		 same base name.

       -lockstep_maxdrops num
		 If  num frames are dropped consecutively, then close the file and resume capture
		 on the next lockstop interval. If num is -1, then permit an unlimited number  of
		 consecutively dropped frames; this is the default.

       -lockstep_totaldrops num
		 If  num  frames  are dropped in the current file, then close the file and resume
		 capture on the next lockstep interval. If num is -1, then  permit  an	unlimited
		 number of total dropped frames; this is the default.

       -noavc	 Disable  use of AV/C VTR control. This is useful if you are capturing live video
		 from a camera because in camera mode, an AV/C play command tells the  camera  to
		 start	recording,  perhaps  over  material on the current tape.  This applies to
		 either interactive more or non-interactive because non-interactive stills  sends
		 a play and stop to the VTR upon capture start and stop.

       -nostop	 Disables sending the AV/C VTR stop command when exiting dvgrab.

       -opendml  If  using  -format  dv2,  create  an  OpenDML-compliant  type	2 DV AVI. This is
		 required to support dv2 files >1GB. dv1 always supports files >1GB.

       -r, -recordonly
		 When the camcorder is in record mode, this option causes dvgrab to only  capture
		 when  the  camcorder is recording and not paused. Normally, when in record mode,
		 dvgrab always captures to let you use the camcorder purely as a camera where the
		 computer operator is in control. This option makes dvgrab act like the VCR where
		 the camera operator controls when capture takes place.  This is very handy  when
		 used  with  the  -autosplit  option  to automatically create a new file for each
		 shot.	This option requires AV/C and will not work with the -noavc option.

       -rewind	 Rewind the tape completely to the beginning prior to  starting  capture.   Natu-
		 rally, this requires AV/C; however, perhaps not so obvious is that this does not
		 apply to interactive mode.

		 Normally, the capture status information is displayed after finished writing  to
		 each  file. This option makes it show the capture status during capture, updated
		 for each frame.

       -s, -size num
		 This option tells dvgrab to store at most num	megabytes  (actually,  mebibytes)
		 per  file,  where num = 0 means unlimited file size for large files. The default
		 size limit is 1024 MB.

       -srt	 Generate subtitle files containing the recording date and time  in  SRT  format.
		 For  each  video  file  that  is created two additional files with the extension
		 .srt0 and .srt1 are created. They contain the recording date and time as  subti-
		 tles  in the SRT format. The .srt0 file contains the subtitles with timing based
		 on the running time from the start of the current file.  Use this  file  if  you
		 transcode  to a format like AVI. The .srt1 file contains the subtitles with tim-
		 ing based on the time code as delivered by  the  camera.   The  mplayer  program
		 understands this type of subtitles.

       -stdin	 Read the DV stream from a pipe on stdin instead of FireWire.

       -timecode Put the timecode of the first frame of each file into the file name.

       -t, -timestamp
		 Put information on date and time of recording into file name.

       -timesys  Put  system  rather than recording date and time into file name.  This is useful
		 when using converter devices that do not change the recording date time  in  the
		 DV stream.

       -V, -v4l2 Capture  from	a  USB	Video Class (UVC) device that supports DV.  This uses the
		 uvcvideo kernel module via V4L2.  The default device file is /dev/video. Use the
		 -input option to set a different device file.

       -v, -version
		 Show version of program.

       -24p	 For Quicktime DV, set the frame rate as 24 fps in the Quicktime file.	This only
		 works as expected when the video has been shot in 24p mode.

       -24pa	 For Quicktime, DV, in addition to setting the frame rate to 24 in the	Quicktime
		 file,	also  reverse the 2:3:3:2 pulldown process by removing the interlaced "C"
		 frame. This only works as expected when the video has been shot in 24p  Advanced
		 mode. See http://www.adamwilt.com/24p/

       dvgrab foo-
		 Captures  video  data	from  the  default FireWire source and stores it to files
		 foo-001.avi, foo-002.avi, etc.

       dvgrab -frames 25 foo-
		 Assuming a PAL video source, this command records one second's  worth	of  video
		 data per file.

       dvgrab -autosplit -frames 750 -timestamp foo-
		 Records  video  data from the default FireWire source, cuts it into chunks of 30
		 seconds (assuming PAL) or when a new recording starts and  names  the	resulting
		 files according to date and time info in the videostream.

       dvgrab -autosplit -size 1998 -csize 4400 -cmincutsize 10  foo-
		 Records  video data from the default FireWire source, cuts it into chunks when a
		 new recording starts or when the current file exceeds 1998 megabytes  (actually,
		 mebibytes),  or  the current collection of files exceeds 4400 megabytes. It also
		 reduces the size of the smallest file made due to a collection size  cut  to  10

		 This  option is perfect for backing up DV to DVD's as 2 Gb is around the maximum
		 file size that (the current) linux implementation of the ISO9660 filesystem  can

		 Warning:  It  is  possible to make ISO9660 filesystems with files greater than 2
		 Gb, but the current linux IS09660 driver can't read them!  Newer  linux  kernels
		 may be able to handle ISO9660 filesystems with filesizes greater than 2 Gb.

       dvgrab -format hdv -autosplit
		 Capture from a HDV camcorder.

       dvgrab -format mpeg2 -guid 1
		 Record from a digital TV settop box.

       dvgrab -jpeg-over -jpeg-w=320 -jpeg-h=240 -d smpte=1 webcam.jpeg
		 Capture a single frame, save it as a JPEG named webcam.jpg and exit.  This exam-
		 ple also demonstrates option handling. You only need to specify enough of a long
		 option name to uniquely identify it. You can use space or equal sign to separate
		 option name and argument. The file format is inferred from the  filename  exten-
		 sion.	Also,  since  -jpeg-overwrite is used, the filename will be exactly "web-
		 cam.jpeg" and not include any numbers.

       dvgrab -V Capture over USB from a UVC compliant DV device.

       dvgrab -v4l -input /dev/video1
		 Capture over USB from a UVC compliant DV device using device file /dev/video1.

       dvgrab -format=hdv -autosplit=28800 -srt foo-
		 Capture from a HDV camcorder, splitting whenever there is a gap in the recording
		 that  lasts  longer  than 8 hours. This will likely generate a separate file for
		 each day (useful for holiday videos). It  will  also  generate  subtitle  files.
		 Assuming  that  the  files foo-001.m2t and foo-002.m2t are generated, the corre-
		 sponding subtitle files will be  foo-001.srt0,  foo-001.srt1  and  foo-002.srt0,
		 foo-002.srt1.	 You  can  use	the subtitle files to show the recording date and
		 time while viewing the video.

       Dan Dennedy <dan@dennedy.org> and Daniel Kobras kobras@debian.org>

       See http://www.kinodv.org/ for more information and support.


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