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<!--RM_ID:130-->
<!--TITLE:Spy Filter-->
<!--H1:Spy Filter-->
<!--DESCRIPTION:Spy filter for logging the parameters of the DS graph.-->
<!--KEYWORDS:Debug Spy Log Logging Trace DirectShow Graph-->
{{This|products/freeware_filters/Spy_filter.html}}

{{Spy Filter: Description}}

==Overview==

'''Spy Filter''' is a great tool for debugging DirectShow application and interaction between filters.

==Features==

Writes to the log file (with {{Log Object}}):
* Connection media type, allocator properties, list of media types from the upstream filter
* Graph structure
* Input DirectShow samples
* Seeking (IMediaSeeking), flushing, NewSegment, EndOfStream, etc.

Saves input DirectShow samples:
* As a binary file(s), with the connection media type at the beginning of the file (binary and text formats) and one or more samples in the file.
* As compressed binary file(s), with the connection media type at the beginning and a set of repeating 16-byte sequences. This type is very useful for saving VANC data.
* As RGB or YUV bitmap (.bmp) file(s). BITMAPINFOHEADER from the connection media type is written to the bitmap file as is. The input data is also saved to a file without color space conversion to  RGB. Accordingly, not all saved files can be viewed in MS Paint or other programs.
{{.idl}}

==Usage==

To check various properties of video, audio, and other streams, do the following:

1. Download and install {{Spy Filter}}.

2. Download and install {{Log Object}}.

3. Insert Spy filter into the DirectShow graph between the filters of interest (connect the input and output pins).

4. Run, stop and close DirectShow graph.

5. Check the log file created by Spy filter with the Log object.

==Related Products==

* {{LinkDescription|Log Object}}
* {{LinkDescription|Video Generator}}

==See Also==

* [[Spy Filter: Release Notes]]
* [[Problem Description Guidelines]]
* [[AVObjects FTP]]

===Action Items===

* {{Spy Filter: Download}}
* {{Log Object: Download}}
* {{Contact Support}}
* {{Place Order!}}

[[Category:Freeware Filters]]
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