GOPCHOP(1)GOPCHOP(1)NAME
gopchop - Fast, lossless cuts-only editor for MPEG2 video files
SYNOPSIS
gopchop [ options ] [ file ]
DESCRIPTION
gopchop cuts and merges MPEG2 video streams. gopchop uses a method to cut streams that does not require re-encoding, and therefore is fast
and not prone to the artifacts and degradation of quality inherent in re-encoding. However, cuts are limited to I-frames or group-of-pic-
ture (GOP) boundaries. These frames occur frequently enough, and often times at scene transitions, so that gopchop's method is adequate for
many applications.
The typical use is manually editing commercials out of recorded television programs.
Another application is splitting .VOB files from dual-layer DVD rips so that the content can be re-authored such that each half will fit on
one single-layer DVD recordable.
OPTIONS -h, --help
Help.
-p, --pipe CMD
Use external command for output. Recommended: 'mplayer -nocache -novm -'
-v, --vo DRIVER
Choose internal output driver. Use 'help' as DRIVER for a list.
-s, --states
Show libmpeg2 decoding states during display. Used mostly for debugging.
-V, --version
Display which version of GOPchop is installed.
AUTHOR
Kees Cook, <kees@outflux.net>
SEE ALSO gtkspu(1), mpegcat(1)
02 March 2009 GOPCHOP(1)
Check Out this Related Man Page
MPEGCAT(1)MPEGCAT(1)NAME
mpegcat - Extracts structural information and PES streams from an MPEG2 video file
SYNOPSIS
mpegcat { options } { file }
DESCRIPTION
mpegcat dumps detailed textual information about an MPEG2 file. It also has an option for writing out a particular Packetized Elementary
Stream (PES) given its id.
The original purpose of mpegcat was for debugging stream parsing issues in the gopchop cuts-only MPEG2 video editor, but it has more gen-
eral utility.
OPTIONS
GENERAL OPTIONS
-d,--debug
Report debug info
-D,--dvd-format
Enable DVD packet extensions
-h,-?,--help
Help
-w,--write FILE,0xID[,0xSID]
Write PES with id ID (and subid SID) to FILE. Sub Picture Unit (SPU) streams such as overlays, subtitles and DVD menus extracted
using this option can be displayed using the companion gtkspu utility.
To find SPU streams in a .VOB ripped from a DVD:
$ mpegcat -iDa VTS_01_0.VOB | grep SPU
131086: 0xBD: DVD Audio 0x20 (SPU 0): 2028 bytes (next marker @ 133120)
133134: 0xBD: DVD Audio 0x20 (SPU 0): 2028 bytes (next marker @ 135168)
137230: 0xBD: DVD Audio 0x20 (SPU 0): 190 bytes (next marker @ 137426)
...
To save a given stream:
$ mpegcat -iDaw dump.spu,0xBD,0x20 VTS_01_0.VOB > /dev/null
(And to view the stream)
$ gtkspu dump.spu 1
$ gtkspu dump.spu 2
$ gtkspu dump.spu 3
...
PROCESSING TOGGLES
-V,--enter-video
Process video packets (forced by -t option)
GENERAL DISPLAY TOGGLES
-p,--pack
Toggle Pack packet start display
-v,--video
Toggle video ES packet start display
-a,--audio
Toggle audio ES packet start display
-o,--other
Toggle other stream display (only show video & audio)
-y,--system
Toggle system header display
-e,--errors
Toggle packet errors
-i,--invert
Invert all display toggles
VIDEO DISPLAY TOGGLES
-s,--slices
Toggle slice starts (default off)
-q,--sequence
Toggle sequence header display
-g,--GOPs
Toggle GOP header display
-f,--frames
Toggle Picture header display
SHORT CUTS
-F,--just-frames
Show only video frames (same as '-Vepvaoyq')
FILE OFFSET OPTIONS
-b,--begin=NUM
Start reading at offset NUM
-n,--num=NUM
Stop after reading NUM bytes
-t,--scan-stream
Scan every byte of the stream instead of using PES offsets (this can show erroneous 'start code emulation' codes)
AUTHOR
Kees Cook, <kees@outflux.net>
SEE ALSO gopchop(1), gtkspu(1)
28 October 2006 MPEGCAT(1)