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mfmp4srcsnk.dll - Large delay when right-clicking on Explorer file/folder.

Explorer memory leak with very large prores .mov files recorded on a Video Devices / Sound Devices PIX 250 Recorder. Just selecting multiple files would use 40+GB of ram and pause/hang explorer while calculating metadata. Disabling this is not really the right answer as it affects some other features, so disabling it just for .mov is possibly better but I have yet to investigate that option.

The details of the shell extension that might cause the problem:

Shell Extension Name: MF MPEG-4 Property Handler
Filename: mfmp4srcsnk.dll
Description: Media Foundation MPEG4 Source and Sink DLL
Company: Microsoft Corporation
Product Name:
File Version: 12.0.9600.16384 (winblue_rtm.130821-1623)
CLSID: {f81b1b56-7613-4ee4-bc05-1fab5de5c07e}

If you think that you have similar problem in your system, you can try to fix the problem by disabling the specified shell extension. In order to do that, simply follow the instructions below:

  1. Download and run the ShellExView utility from this Web page.
  2. Find the right shell extension according the details specified above.
  3. Select this shell extension and press F7 to disable this extension. After disabling the shell extension, check if the problem still occurs. If the problem still occurs, you should enable back the shell extension by pressing F8, and then try to search for another shell extension that might cause your problem.

This shell extension problem was reported by