avimerge(1) General Commands Manual avimerge(1)NAME
avimerge - merge several AVI-files into one
SYNOPSIS
avimerge -o name -i file1 [ file2 [ ... ] ] [ -p file ] [ -a num ] [ -A num ] [ -b num ] [ -c ] [ -f commentfile ] [ -x indexfile ]
COPYRIGHT
avimerge is Copyright (C) by Thomas Oestreich.
DESCRIPTION
avimerge is a versatile tool. It can contatenate several AVI files into one. It can also be used to fix an index of a broken file and can
also replace audio tracks or muxes new ones. It can read raw AC3 and MP3 files for multplexing.
OPTIONS -o name
Specify the name of the output file.
-i file
Specify the name(s) of the input file(s) to merge into the output file.
-p file
Specify the name of the audio file to multiplex into the output file. The type of file can be either another AVI file or an MP3 or
AC3 file.
-b num Specify if avimerge should write an VBR mp3 header into the AVI file. Default is dependent on the input file (and usually correct).
num is either 1 or 0.
-c Drop video frames in case audio is missing [off]
Only when merging multiple AVI files. Some AVI files run a little bit (usually for one or two video frames) short on audio. This
means avimerge cannot keep up sync when concatinating them. The files play fine when played individually but not when merged because
audio from the new file gets played back with video from the old file. avimerge will print a message like
No audiodata left for track 0->0 (59950.25=59950.25) continuing ..
When you turn on the -c option, the video which is too much will be dropped.
-f commentfile
Read AVI tombstone data for header comments from commentfile. See /docs/avi_comments.txt for a sample.
-x indexfile
Read the AVI index from indexfile. See aviindex(1) for information on how to create such a file.
-a num Specify the number of the audio track you want to use from the input file.
-A num Specify the number of the audio track you want to use in the output file. If you specify an existing track number, the track will be
replaced. If omitted, the next free slot will be used.
EXAMPLES
The command
avimerge -o big.avi -i my_file1.avi my_file2.avi my_file3.avi
merges the three input files my_file[123].avi into one big AVI-file big.avi.
avimerge -o out.avi -i in.avi -p audio2.avi -a 1
merges track number 1 form in.avi to the next free track number in out.avi. You can create audio-only AVI-files using
transcode -i song.mp3 -x null,mp3 -g 0x0 -y raw -a 1 -o audio2.avi -u 50
The command
avimerge -o out.avi -i in.avi -p sound.mp3
merges the file sound.mp3 as an additional audio track into out.avi.
AUTHORS
avimerge 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), avisplit(1), tccat(1), tcdecode(1), tcdemux(1), tcextract(1), tcprobe(1), tcscan(1), transcode(1)avimerge(1) 26th January 2004 avimerge(1)
Check Out this Related Man Page
aviindex(1) General Commands Manual aviindex(1)NAME
aviindex - Write and read text files describing the index of an AVI file
SYNOPSIS
aviindex [ -o ofile -i ifile -f -n -x -v -h ]
COPYRIGHT
aviindex is Copyright (C) 2003,2004 by Tilmann Bitterberg
DESCRIPTION
aviindex writes a text file describing the index of an AVI file. It analyses the content or index if available of the AVI file and prints
this information in a human readable form.
An AVI file can have an optional chunk called "idx1" which contains information about keyframes (syncpoints) and locations of video frames
resp. audio chunks. Though larger AVI files (>2-4GB), so-called OpenDML AVI or also AVI 2 files, have a more complicated indexing system,
which consists of a superindex referring to (possibly) several "standard" indexes, the "indexing principle" is the same. Movie players use
such indexes to seek in files.
aviindex reads the AVI file ifile and writes the index into ofile. This can either happen in "dumb" mode where aviindex looks for an exist-
ing index (and trusts this index!) in the file and dumps this index into a human readable form. The "dumb" mode is used, when -n is NOT
specified or when the filesize of the input file is smaller than 2 GB.
In "smart" mode, aviindex scans through the complete AVI file and searches for chunks (may that video or audio) and reconstructs the index
based on the information found. If an index chunk is found accidently, aviindex will use the information in this index to recover the
keyframe information, which is important. aviindex will use smart mode, if given the -n option OR if the AVI file is larger than 2 GB. If
the file is large, the index chunk cannot be found the usual way so one must use -n but it is possible that there is an index chunk in this
file. Cross fingers.
Also in smart mode, aviindex analyzes the content of the video frame and tries to detect keyframes by looking at the data depending on the
video codec.
The generated index file serves different purposes.
* The library which handles AVI files in transcode(1) can read such index files and use this file to rebuild the index instead
of scanning through the whole AVI file over and over again. Reading the index from the index file is much faster than scan-
ning through the AVI.
* It can be used as a seeking file. When given to transcode via the --nav_seek switch, transcode will use the file to seek
directly to the position you specified via -c. This also works for multiple -c ranges.
* Its nice to have for debugging.
OPTIONS -o ofile
Specify the name of the output file.
-i ifile
Specify the name of the input file.
-f force the use of the existing index.
-n force generating the index by scanning the file.
-x (implies -n) don't use any existing index to generate keyframes.
-v show version.
-h show help text.
MPLAYER
aviindex can convert from and to mplayer-generated index files. Since mplayer-1.0pre3 mplayer has the ability to save the index via
-saveidx FILE and load it again through -loadidx FILE. aviindex is able to convert an mplayer index file to a transcode index file and
vice visa. It is not able to directly write an mplayer file, though. Example of a toolchain
mplayer -frames 0 -saveidx mpidx broken.avi
aviindex -i mpidx -o tcindex
avimerge -x tcindex -i broken.avi -o fixed.avi
Or the other way round
aviindex -i broken.avi -n -o broken.idx
aviindex -i broken.idx -o mpidx
mplayer -loadidx mpidx broken.avi
The major differences between the two index file formats is that the mplayer one is a binary format which is an exact copy of an index in
the AVI file. aviindex 's format is text based. See FORMAT for details.
EXAMPLES
The command
aviindex -i 3GBfile.avi -o 3GB.index
generates and index of the large file 3GBfile.avi. You can use the file 3GB.index to tell transcode to read the index from this file and
not from the avi. This leads to much faster startup time.
Suppose 3GBfile.avi has DivX video and PCM sound and you want to encode several ranges.
transcode -V -i 3GBfile.avi --nav_seek 3GB.index
-x xvid,avi
-c 5000-6000,0:20:00-0:21:00,100000-100001
-y xvid --lame_preset standard -o out.avi
FORMAT
The format of the index file. The first 7 bytes in this file are "AVIIDX1" for easy detection and a comment of who created the file. The
second line is a comment and describes the fields. Do not delete it. Each line (except the first 2) consists of exactly 8 fields all seper-
ated by one space and describing one particular chunk of the AVI file.
Here is an example of an AVI file with two audio tracks.
AVIIDX1 # Generated by aviindex (transcode-0.6.8)
TAG TYPE CHUNK CHUNK/TYPE POS LEN KEY MS
00db 1 0 0 2048 8335 1 0.00
01wb 2 1 0 10392 847 1 0.00
01wb 2 2 1 11248 847 1 0.00
02wb 3 3 0 12104 847 1 0.00
02wb 3 4 1 12960 847 1 0.00
00db 1 5 1 13816 5263 0 0.00
00db 1 6 2 19088 3435 0 0.00
01wb 2 7 2 22532 834 1 0.00
The field TAG is the chunk descriptor. Its "00d*" for the video, "01wb" for the first audio track, "02wb" for the second audio track and so
on.
The field TYPE is the type of the chunk. This is redundant because the type is also embedded into the TAG field but its a convenient thing
to have. Its 1 for video, 2 for first audio track and 3 for second audio track.
The field CHUNK is the absolute chunk number in the AVI file. If you read the CHUNK field in the last line of the index file, you know how
many chunks this AVI file has.
The field CHUNK/TYPE holds information about how many chunks of this type were previously found in the AVI file.
The field POS is the absolute byte position in the AVI file where this chunk can be found. Note this field can hold really large numbers if
you are dealing with large AVIs.
The field LEN is the length of this chunk.
The field KEY holds information if this chunk is a keyframe. In the example above, all audio chunks are key-chunks, but only the first
video frame is a key frame. This field is either 0 or 1.
The field MS holds information about how many milliseconds have passed. This field may be 0.00 if unknown.
AUTHORS
aviindex was written by Tilmann Bitterberg <transcode at tibit.org>
and is part of transcode.
SEE ALSO avifix(1), avisync(1), avimerge(1), avisplit(1), tccat(1), tcdecode(1), tcdemux(1), tcextract(1), tcprobe(1), tcscan(1), transcode(1),
mplayer(1)aviindex(1) 29th February 2004 aviindex(1)