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avisplit

split AVI-files into chunks of a maximum size


  1. avisplit.1.man


1. avisplit.1.man

Manpage of avisplit

avisplit

Section: User Commands (1)
Updated: 25th June 2003
Index Return to Main Contents
 

NAME

avisplit - split AVI-files into chunks of a maximum size  

SYNOPSIS

avisplit [ -i file -o base [ -s size ] [ -H num ] [ -t s1-s2[,s3-s4,..] -c -m -b num -f commentfile ] ] [ -v ]  

COPYRIGHT

avisplit is Copyright (C) by Thomas Oestreich.  

DESCRIPTION

avisplit splits a single AVI-file into chunks of size size.
Each of the created chunks will be an independent file, i.e. it can be played without needing any other of the chunk.  

OPTIONS

-i file
Specify the filename of the file to split into chunks.
-o base
Specify the base of the output filename(s) avisplit will then split to base-%04d.avi
-s size
Use this option to specify the maximum size (in units of MB) of the chunks avisplit should create. 0 means dechunk, create as many files as possible.
-H num
Create only the first num chunks then exit.
-t s1-s2[,s3-s4,..]
Split the input file based on time/framecode (hh:mm:ss.ms)
-c
Together with -t. Merge all segments into one AVI-File again instead generating seperate files.
-m
Together with -t. Force split at upper bondary instead of lower border.
-b num
Specify if avisplit should write an VBR mp3 header into the AVI file. Default is 1 because it does not hurt. num is either 1 or 0.
-f commentfile
Read AVI tombstone data for header comments from commentfile. See /docs/avi_comments.txt for a sample.
-v
Print only version information and exit.
 

EXAMPLES

The command

avisplit -s 700 -i my_file.avi

will split the file my_file.avi into chunks which's maximum size will not exceed 700 MB, i.e. they will fit onto a CD, each. The created chunks will be named my_file.avi-0000, my_file.avi-0001, etc.

avisplit -i my_file.avi -c -o out.avi -t 00:10:00-00:11:00,00:13:00-00:14:00

will grab Minutes 10 to 11 and 13 to 14 from my_file.avi and merge it into out.avi  

BAD SYNCH

When you split a file with avisplit and the A/V sync for the first file is OK but the sync on all successive files is bad then have a look at the output of tcprobe(1) (shortend).



 | V: 25.000 fps, codec=dvsd, frames=250, width=720, height=576

 | A: 48000 Hz, format=0x01, bits=16, channels=2, bitrate=1536 kbps,

 |    10 chunks, 1920000 bytes

You'll see the AVI file has only 10 Audio chunks but 250 video chunks. That means one audio chunk spans several video frames. avisplit can not cut a chunk in half, it only handles complete chunks. If you do, say, avisplit -s 20, it is possible that the first file will have 6 audio chunks and the second one only 4 meaning there is too much audio in the first AVI file.

The solution is to remux the AVI file with

transcode -i in.avi -P1 -N 0x1 -y raw -o out.avi
(of course -N 0x1 is not correct for all AVI files). Now look at tcprobe again



 | V: 25.000 fps, codec=dvsd, frames=250, width=720, height=576

 | A: 48000 Hz, format=0x01, bits=16, channels=2, bitrate=1536 kbps,

 |   250 chunks, 1920000 bytes

The data in this file is exactly the same (its bit-identical) as it was in in.avi; the AVI file was just written in a different way, we do now have 250 audio chunks which makes splitting much easier and more accurate for avisplit.  

AUTHORS

avisplit was written by Thomas Oestreich
<ostreich@theorie.physik.uni-goettingen.de> with contributions from many others. See AUTHORS for details.  

SEE ALSO

aviindex(1), avifix(1), avimerge(1), tccat(1), tcdecode(1), tcdemux(1), tcextract(1), tcprobe(1), tcscan(1), transcode(1)


 

Index

NAME
SYNOPSIS
COPYRIGHT
DESCRIPTION
OPTIONS
EXAMPLES
BAD SYNCH
AUTHORS
SEE ALSO

This document was created by man2html using the manual pages.
Time: 17:30:20 GMT, October 23, 2013

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