MATLAB: Does the axis background color appear gray instead of white in the generated AVI file in MATLAB 7.2 (R2006a)

avibackgroundcolorcompressionMATLAB

I am using the AVIFILE function to generate an AVI file using GETFRAME/ ADDFRAME commands. When the MATLAB figure window pops up, the axis background appears to be white as expected but the same turns gray in the generated AVI file.

Best Answer

The change in the axis background color occurs due to the compression codec setting used in the AVI file generation. For the AVIFILE function, the default compression codec setting used is 'Indeo5' for Windows and 'None' for UNIX.

To change the appearance of the axis background color in the generated AVI file, change the compression code setting to 'Indeo3' or 'None' for Windows.

This can be done be changing the 'compression' parameter value using the following syntax for calling AVIFILE

 aviobj = avifile(filename, 'Param1', Val1, 'Param2', Val2,...)

Related Solutions

MATLAB: Am I unable to use a compression codec with AVIFILE using MATLAB 7.7 (R2008b) on Windows XP/Vista x64 machine

To resolve this issue in MATLAB 7.7 (R2008b), you may create an uncompressed video using

avifile(filename, 'Compression', 'None')

and then compressing the file using a third party tool like:

- Windows Movie Maker
- Windows Media 9 encoder
- VirtualDub (<http://www.virtualdub.org/>)
- Quicktime Pro

VirtualDub has a command line interface so it is possible to drive it using SYSTEM.

The second workaround is to specify a codec for a compression that is installed. The ones that are included with Windows XP 64 are

          *     IYUV — Intel YUV codec (c:\winnt\system32\iyuv_32.dll)
          *     MRLE — Microsoft RLE codec (c:\winnt\system32\msrle32.dll)
          *     MSVC — Microsoft Video 1 codec (c:\winnt\system32\msvidc32.dll)

For example, to use the Intel YUV codec, use the four-CC code:

aviobj = avifile('myvideo.avi', 'compression', 'IYUV');

Other codecs can be found at http://fourcc.org.

Note there are restrictions with some codecs. For example, some codecs can only be used with grayscale images.

MATLAB: Do I receive an error when attempting to play AVI-files created by MATLAB or SimMechanics with the Indeo 5 codec

These errors can occur for a number of reasons. Here are the three most common causes, with workarounds provided for each:

1. Windows Media Player does not allow you to play Indeo 5 AVI-files from a remote network location.

Microsoft recently added this restriction. If you attempt to play the AVI-file directly from the internet or from a mapped network drive, you will receive the error.

To work around this issue, copy your AVI-file to a local hard disk before attempting playback.

2. The Indeo 5 codec is not installed on your system.

Microsoft did not include the Indeo codecs for Windows Media Player with Windows XP Service Pack 1.

You can purchase the Indeo codecs separately from Ligos Corporation

3. The Indeo 5 codec is not supported by your movie player.

To work around this issue, use a different compression method when creating your AVI-files.

For a list of codecs supported by Windows Media Player and QuickTime Player, please view the documentation for the specific players. The following links may be helpful in answering questions related to codec support:

https://support.microsoft.com/en-us/windows/codecs-frequently-asked-questions-392483a0-b9ac-27c7-0f61-5a7f18d408af

https://help.apple.com/finalcutpro/mac/10.4.4/

Best Answer

Related Solutions

MATLAB: Am I unable to use a compression codec with AVIFILE using MATLAB 7.7 (R2008b) on Windows XP/Vista x64 machine

MATLAB: Do I receive an error when attempting to play AVI-files created by MATLAB or SimMechanics with the Indeo 5 codec

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