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144 lines
3.8 KiB
144 lines
3.8 KiB
.TH avisplit 1 "25th June 2003" "avisplit(1)"
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.SH NAME
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avisplit \- split AVI-files into chunks of a maximum size
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.SH SYNOPSIS
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.na
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.B avisplit
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[
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.B -i
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.I file
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.B -o
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.I base
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[
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.B -s
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.I size
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] [
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.B -H
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.I num
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] [
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.B -t
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.I s1-s2[,s3-s4,..]
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.B -c
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.B -m
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.B -b
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.I num
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.B -f
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.I commentfile
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]
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] [
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.B -v
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]
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.SH COPYRIGHT
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\fBavisplit\fP is Copyright (C) by Thomas Oestreich.
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.SH DESCRIPTION
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.B avisplit
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splits a single AVI-file into chunks of size \fIsize\fP.
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.br
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Each of the created chunks will be an independent file, i.e. it can
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be played without needing any other of the chunk.
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.SH OPTIONS
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.TP
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\fB-i\fP \fIfile\fP
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Specify the filename of the file to split into chunks.
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.TP
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\fB-o\fP \fIbase\fP
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Specify the base of the output filename(s) \fBavisplit\fP will then split to
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\fBbase-%04d.avi\fP
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.TP
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\fB-s\fP \fIsize\fP
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Use this option to specify the maximum size (in units of MB) of the
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chunks \fBavisplit\fP should create. \fI0\fP means dechunk, create as many
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files as possible.
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.TP
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\fB-H\fP \fInum\fP
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Create only the first \fInum\fP chunks then exit.
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.TP
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\fB-t\fP \fIs1-s2[,s3-s4,..]\fP
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Split the input file based on time/framecode (hh:mm:ss.ms)
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.TP
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.B -c
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Together with \fB-t\fP. Merge all segments into one AVI-File again instead
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generating seperate files.
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.TP
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.B -m
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Together with \fB-t\fP. Force split at upper bondary instead of lower border.
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.TP
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\fB-b\fP \fInum\fP
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Specify if avisplit should write an VBR mp3 header into the AVI file. Default is
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1 because it does not hurt. \fInum\fP is either 1 or 0.
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.TP
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\fB-f\fP \fIcommentfile\fP
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Read AVI tombstone data for header comments from \fIcommentfile\fP. See
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/docs/avi_comments.txt for a sample.
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.TP
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.B -v
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Print only version information and exit.
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.SH EXAMPLES
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The command
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.PP
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.B avisplit -s 700 -i my_file.avi
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.PP
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will split the file \fImy_file.avi\fP into chunks which's maximum size
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will not exceed 700 MB, i.e. they will fit onto a CD, each. The
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created chunks will be named my_file.avi-0000, my_file.avi-0001, etc.
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.PP
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.B avisplit -i my_file.avi -c -o out.avi -t 00:10:00-00:11:00,00:13:00-00:14:00
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.PP
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will grab Minutes 10 to 11 and 13 to 14 from my_file.avi and merge it into out.avi
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.SH BAD SYNCH
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When you split a file with \fBavisplit\fP and the A/V sync for the first file
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is OK but the sync on all successive files is bad then have a look at the
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output of tcprobe(1) (shortend).
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.br
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| V: 25.000 fps, codec=dvsd, frames=250, width=720, height=576
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.br
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| A: 48000 Hz, format=0x01, bits=16, channels=2, bitrate=1536 kbps,
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.br
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| \fI10\fP chunks, 1920000 bytes
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.br
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You'll see the AVI file has only 10 Audio chunks but 250 video
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chunks. That means one audio chunk spans several video frames.
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avisplit can not cut a chunk in half, it only handles complete
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chunks. If you do, say, avisplit -s 20, it is possible that the first file will
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have 6 audio chunks and the second one only 4 meaning there is too much
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audio in the first AVI file.
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The solution is to remux the AVI file with
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.RS
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.B transcode -i in.avi -P1 -N 0x1 -y raw -o out.avi
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.RE
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(of course -N 0x1 is not correct for all AVI files).
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Now look at tcprobe again
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.br
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| V: 25.000 fps, codec=dvsd, frames=250, width=720, height=576
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.br
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| A: 48000 Hz, format=0x01, bits=16, channels=2, bitrate=1536 kbps,
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.br
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| \fI250\fP chunks, 1920000 bytes
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.br
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The data in this file is \fIexactly\fP the same (its bit-identical)
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as it was in in.avi; the AVI file was just written in a
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different way, we do now have 250 audio chunks which makes splitting much
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easier and more accurate for avisplit.
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.SH AUTHORS
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.B avisplit
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was written by Thomas Oestreich
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.br
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<ostreich@theorie.physik.uni-goettingen.de> with contributions from
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many others. See AUTHORS for details.
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.SH SEE ALSO
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.BR aviindex (1),
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.BR avifix (1),
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.BR avimerge (1),
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.BR tccat (1),
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.BR tcdecode (1),
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.BR tcdemux (1),
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.BR tcextract (1),
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.BR tcprobe (1),
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.BR tcscan (1),
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.BR transcode (1)
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