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Common problems with AVI files are caused by the required codec. Here we show you which codec's are being used, using GSpot.

Say you have an AVI file but it doesn't play on your PC ... in that case we need to know which codec(s) are required for playback. But how do we find out?

In another situation, you tried to transcode (convert) an AVI file to another format, but for example audio isn't there in the end result. GSpot can tell you which codec is needed or used ...

GSpot can help us with this ... it completely analyses your AVI file and gives you an overview of all relevant information.
GSpot can be downloaded from the Download Page or from the GSpot homepage.

Note: A common problem with audio in AVI's is that it's codec using AC3! Which most encoders, like TMPGEnc, cannot handle.

Read the Disclaimer!

Download DivX

My own DivX logo - Download them here in Photoshop format
download my own DivX logo here!

Download the DivX codec here ...

Codec's ... ???

A codec is a kind of "translator". It can enCODe and/or DECode data. This can be done by software or hardware.

Commonly we use codec's for AUDIO and VIDEO. For example; when you play an MP3 song, the computer will send the data of that particular MP3 file through the MP3 codec, so you can hear the song. The codec converts the compressed data (in this case) to an uncompressed format, which can be played by the computer, using your sound card.

A similar thing can be found with video. For example the DivX codec.

Using codec's is a good approach to arrange playback. However, you do need the codec that is being used to create your movie or song in order to have playback.

Sometimes, codec's can cause quite some problems.

Two examples;

An AC3 track can contain 6 audio channels - Left Front, Right Front, Center Front, Sub woofer, Left Back (surround), and Right Back (also Surround). Actually, there are only 5 channels, as the sub woofer is not really a channel.

When an application needs to convert audio to a different format, but assumes only 2 channels (regular Stereo), conversion will be a problem. Such an example is TMPGEnc. It assumes 2 channels and is not able to down mix (merge) the 6 channels to 2 channels.

Another example is the playback of MPEG4 files.

Say you have a movie, encoded with XviD. Your PC however has only DivX installed and associated the XviD with the DivX codec. Sometimes this can cause issue.

One of the most infamous problems is that the screen is either green, shows artifact (little green blocks) or behaves as if it's melting.

So to find the problem, we might need to take a look at the codec's being used. GSpot is the right tool for this.

Using GSpot

First download GSpot from the Download Page or from the GSpot homepage and extract it to an appropriate location (there is no "setup").

Now there are two ways to use GSpot;

  • Open GSpot and open a file
  • Using the shell; right click the AVI file

I'll explain both.

Starting GSpot directly

The simplest way to use GSpot, after extracting the archive, is to simply double click the GSpot executable (GSpot - Double click the application icon).

Once GSpot opens, either click the "..." button (see the arrow in the image below), or choose from the "File" menu, the option "Open", or press CTRL+O.
This brings up a dialog window, allowing you to select an AVI file you wish to analyze.

Gspot - Open an AVI file
Gspot - Open an AVI file

Associating GSpot with AVI files

The second way of using GSpot, is by associating it with AVI files. However; be careful that you do not remove the normal AVI association.

You will need to do these steps below only once, as Windows (most versions) will remember this "association".

The easiest way to do this, in Windows 2000 or XP, is by right clicking an AVI file. From the menu select "Open With" - "Choose Program".

Note: not all Windows version support this feature. Some versions do, but one needs to keep the Shift key pressed while right clicking the AVI file to get to this option.

GSpot - associate it with AVI files
GSpot - associate it with AVI files

Another dialog will open, allowing you to select an application.

GSpot - Click BROWSE to find GSpot
GSpot - Click BROWSE to find GSpot

WARNING: Before continuing, make SURE that "Always use the selected program to open this kind of file" is NOT checked!

Now click the "Browse..." button. A file dialog will open. Browse to the GSpot application, select it and click "OK".

WARNING: Before continuing, make SURE that "Always use the selected program to open this kind of file" is NOT checked!

Click "OK" again. Windows now knows that GSpot can also open AVI files.

Now for each time you want to analyze an AVI file, simply right click the AVI and select "Open With" - "GSpot Codec Information Appliance".

GSpot - Open AVI from the Windows Explorer
GSpot - Open AVI from the Windows Explorer

After clicking this option, GSport will instantly open and show the AVI information.

What information means

It's all nice and dandy to see the information, but what does it mean? I'll try to explain it, based on an example;

Suppose we open an AVI which use DivX (video) and MP3 (audio), something like this might appear;

GSport - We opened an AVI using DivX and MP3
GSport - We opened an AVI using DivX and MP3

The information in a bit more detail;

Section Field Value Meaning
File Path D:\Downloads\New files\... The path and filename of the selected AVI
  Size 1,412 Mb The exact file size
  Stat File Length Correct Indicates that the floozies is what it should be (not truncated, or corrupt).
Stream Type Type OpenDML AVI This indicates that the file has been formatted according to the OpenDML AVI format - which is an extension to the original AVI format.
Comments - - These are optional fields, sometimes used to indicated which tools have been used or who has created this file. Not really important, but can be useful when searching for tools.
Video Format 4CC DX50/divx This field shows you the so called 4CC code. In this case DX50.
  Name DivX 5.0 Explains the 4CC code. In this case DX50, the 4CC code, means DivX 5.0.
  Stat 3 compatible codec's installed This actually is a button. It shows you that there are appropriate codec's installed on your PC (in this example even 3!). Click this button to see some details.
  Length 01:36:11 Playback time of the AVI file (1 hour, 36 minutes and 11 seconds).
  x:y 704x276 (2.55:1) Dimensions (Resolution) and aspect ratio of the movie.
Here the movie is 704 pixels wide and 276 high. The aspect ratio is 2,55 : 1.
  Bitrate 1854 kb This DivX has been encoded with a 1854 Kbps bitrate,
  FPS 25.00 at a framerate of 25 fps (= PAL). See also the Video Formats Page.
Audio Format Name 0x0055 (MP3) The audio track of this movie is MP3 encoded.
  Stat 5 compatible codec's installed Again a button, which shows us that on your PC 5 codec's are being found that can play this type of audio stream. Click it to see details.
  Bitrate 192 Kbps (96/ch x 2ch) CBR The MP3 stream has been encoded with 192 Kbps. It uses 96 Kbps per channel, and has 2 channels (stereo). Encoding is done using a Constant BitRate (CBR).

One thing we haven't discussed is the "DirectShow Render" area. This area is being used to "try" to play the AVI using Windows' DirectShow system.

It will, incase it's successful, show you if your PC is capable of playing the file and which DirectShow filters are being used to do that.

Note: this only implies that it's very likely that the Windows Media Player can play this movie. It does not imply that other applications (like TMPGEnc, etc) can deal with this!

Click the "Render" button.

Gspot - Trying to "Play" the AVI file, to see if your PC can handle it
GSpot - Trying to "Play" the AVI file, to see if your PC can handle it

GSpot will now try to play the AVI. A result may look as such:

GSpot - Successfully played the AVI
GSpot - Successfully played the AVI

GSpot now shows you what it used to play this movie;

For VIDEO: (S) --> AVI Splitter --> ffdshow MPEG-4 Video Decoder --> Subtitle Mixer --> DirectVobSub (auto-loading version) --> (R)

This means that the Source "(S)" has been send to "AVI Splitter", which did send it to "FFDShow", which used the "Subtitle Mixer", which used "VobSub" to display it "(R)".

For AUDIO: (S) --> AVI Splitter --> MPEG Layer-3 Decoder --> Morgan Stream Switcher --> (R)

The source "(S)" is again pushed through "AVI splitter". The audio stream is the send to the "MPEG Layer-3 decoder" which is passed through the "Morgan Stream Switcher" and the played "(R)".

An example that has AC3 audio in it (so a potential problem for TMPGEnc for example);

GSpot - This AVI file has AC3 audio!
GSpot - This AVI file has AC3 audio!

We identify the AC3 audio track based on this name: "ac3 (0x2000) Dolby Laboratories, Inc".

This track has 5 channels and can cause problems with for example TMPGEnc.

When rendering this movie, you might see exactly the same results as with the previous AVI file. The previous file can be handled by TMPGEnc, but this one NOT.

Analyzing AUDIO files

GSpot can also analyze WAV files. Open a WAV file in GSpot and you will see the bitrate, channels.

This does not work for all WAV types, for example AC3 files are not identified properly.

However OGM, OGG and MP3 files are supported too ....

GSpot supports WAV, MP3, OGG and OGM as well (not always)
GSpot supports WAV, MP3, OGG and OGM as well (not always)


 

 


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