---
name: "avisync"
section: "1"
platform: "linux"
package: "transcode"
version: "3:1.1.7-9+b4"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/avisync"
---

# avisync(1)

adjust audio synchronisation

## NAME

avisync - adjust audio synchronisation

## SYNOPSIS

**avisync** \[ **-o** *file* **-i** *file* **-q** **-n** *num* **-b** *num* **-a** *track* **-f** *commentfile* \]

## COPYRIGHT

**avisync** is Copyright (C) by Thomas Oestreich.

## DESCRIPTION

**avisync** shift audio on frame basis.

## OPTIONS

- **-o** *name*

  Specify the name of the output file.

- **-i** *file*

  Specify the name of the input file.

- **-q**

  be less verbose.

- **-n** *count*

  shift audio by *count* frames. If *count* is positive, audio starts with audio frame *count* at the beginning of the AVI-file. If *count* is negative, audio is prepended *count* padding frames.

- **-a** *track*

  Specify the number of the audio channel to shift.

- **-b** *num*

  Specify if avisync 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.

## EXAMPLES

The command

**avisync -i my\_file1.avi -o out.avi -n -10**

puts 10 audio frames at the beginning of the AVI-file.

E.g. if the audio is delayed about 200 ms (0.2 seconds) and you're working with a 25 frames per second AVI-File, you need to shift the audio 200/40 = 5 frames since one frame is 40 ms long.

## AUTHORS

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

## SEE ALSO

[**aviindex**(1)](/aviindex/1.md), [**avifix**(1)](/avifix/1.md), [**avimerge**(1)](/avimerge/1.md), [**avisplit**(1)](/avisplit/1.md), [**tccat**(1)](/tccat/1.md), [**tcdecode**(1)](/tcdecode/1.md), [**tcdemux**(1)](/tcdemux/1.md), [**tcextract**(1)](/tcextract/1.md), [**tcprobe**(1)](/tcprobe/1.md), [**tcscan**(1)](/tcscan/1.md), [**transcode**(1)](/transcode/1.md)