DVGRAB(1)DVGRAB(1)NAMEdvgrab — Capture DV or MPEG-2 Transport Stream (HDV) video and audio
data from FireWire
SYNOPSISdvgrab [options] [base] [-]
DESCRIPTIONdvgrab 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 -timestamp, -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 stdout. 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 pro‐
grams 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 stdin.
OPTIONS
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, -autosplit
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.
-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 con‐
junction 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 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 collec‐
tion, the new collection starting point is reset.
-csize num
This option tells dvgrab to split the files when the collec‐
tion of files exceeds num megabytes. This option is used to
create collections of files that fit perfectly into num
megabytes (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:
all,pat,pmt,pids,pid=N,pes,packet,video,sonya1
-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 | raw | dif | qt | 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 recognizable: avi, dv,
dif, mov, jpg, jpeg, and m2t (HDV).
dv1 and dv2 both are AVI files with slightly different for‐
mats. dv2 stores a separate audio track in addition to the
DV video track, which is more compatible with other applica‐
tions. dv1 only stores a single, integrated DV track since
the DV format natively interleaves audio with video. There‐
fore, while dv1 produces 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—how‐
ever, 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 Main‐
Concept 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-TS).
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 specified 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 specify a GUID,
dvgrab will establish (or overlay) a peer-to-peer connection
with the device instead of listening to the device's broad‐
cast. If you supply a hex value of 1, then dvgrab attempts
to discover the device as well as setup a peer-to-peer con‐
nection. 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 -stdin.
-i, -interactive
Make dvgrab interactive where single keypresses on stdin con‐
trol the camera VTR or start and stop capture. Otherwise,
dvgrab runs in session mode, where it immediately starts cap‐
ture and stops as directed or interrupted (ctrl-c).
-jpeg-deinterlace
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 files.
-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 image.
-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.
-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, per‐
haps over material on the current tape. This applies to
either interactive more or non-interactive because non-inter‐
active 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.
-showstatus
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 per
file, where num = 0 means unlimited file size for large
files. The default size limit is 1024 MB.
-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.
EXAMPLESdvgrab 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 sec‐
ond'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, 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
megabytes.
This option is perfect for backing up DV to DVD's as 2 Gb is
around the maximum file size that (the current) linux imple‐
mentation of the ISO9660 filesystem can handle!
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 example 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 sep‐
arate option name and argument. The file format is inferred
from the filename extension. Also, since -jpeg-overwrite is
used, the filename will be exactly "webcam.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.
AUTHOR
Dan Dennedy <dan@dennedy.org> and Daniel Kobras kobras@debian.org>
See http://www.kinodv.org/ for more information and support.
DVGRAB(1)
