NAME
ogmcat - Concatenate several OGG/OGM files into one big OGG/OGM file
SYNOPSIS
ogmcat [options] -o outname inname1 [inname2 [inname3 ...]]
DESCRIPTION
ogmcat does NOT work at the moment. It is work in progress. I included
it just out of laziness (otherwise I’d have to remove it from the
Makefile/configure stuff prior to releasing this version).
ogmcat can be used to concatenate several OGG/OGM files into one big
file if they are of the same type. For a more in-depth description
refer to the LIMITATIONS section.
-o, --output outname
Output to ’outname’.
inname1
Use ’inname1’, ’inname2’ etc as the sources.
-m, --manualsync n
Specifies a manual sync value in ms that will be added to each
stream’s presentation timestamps along with the value calculated
by the chosen sync algorithm (see the -s option). This option
can be used for each input file although it has no effect if
used for the first one as well.
-s, --sync nr
Uses sync mode nr. Valid values are 0 - 4. The default value is
shown on ogmcat’s help screen.
-n, --nosafetychecks
Disable the safety checks made prior to the concatenating. The
resulting file may be unplayable. See the LIMITATIONS section
for further details.
-v, --verbose
Be verbose and show each OGG packet. Can be used twice to
increase verbosity.
-h, --help
Show this help.
-V, --version
Show version information.
LIMITATIONS
Concatenating streams is difficult at the best and might even be
impossible. Therefore ogmcat makes very strict comparisons between the
streams contained in the input files. The checks done include:
* general: All streams with the same serial number must be of the
same type (video, audio, Vorbis audio or text streams).
* general: If a stream exists in one file it must in the other
files as well.
* video streams: The codec FourCC, width, height and FPS must
match.
* Vorbis streams: The sample rate and the number of channels must
match.
* other audio streams: The codec ID, sample rate, bits per sample
and number of channels must match.
* text/subtitle streams: The ’time unit’ must match.
The user can forcefully override the last four checks with the -n
parameter. The checks marked as ’general’ cannot be overridden this
way.
Audio/video synchronization might not be ok in the resulting file even
if the source files were perfectly in sync. The user can experiment
with the -s parameter which causes ogmcat to use slightly different
algorithms for calculating the granulepos values for the audio and text
streams. The range of valid parameters will be printed on ogmcat’s help
screen.
If none of the synchronization algorithms provided works correctly then
the user can also manually add a synchronization offset using the -m
option for each input file.
AUTHOR
ogmcat was written by Moritz Bunkus <moritz@bunkus.org>.
SEE ALSO
ogmmerge(1), ogminfo(1), ogmdemux(1), ogmsplit(1), dvdxchap(1)
WWW
The newest version can always be found at
<http://www.bunkus.org/videotools/ogmtools/>