// Oprogramowanie Roman Ryltsov
A few years ago the question was already asked: DirectShow Spy: Who Sent EC_ERRORABORT?. The spy already attempted to log a call stack in order to identify the sender of the message. However overtime the tracing capability stopped functioning. There were a few reasons and limitations of internal stack unwinder specifically resulted in inability to…
Many questions in DirectShow development are caused by lack of developer’s understanding what topology his code effectively built. Intelligent Connect and RenderXxx methods help adding and connecting filters and in the end a developer does not have a faintest idea what the pipeline looks like. DirectShow API provides methods to enumerate filters, pins, connection and…
There was a problem reported for registered and relocated DirectShowSpy, which might be causing issues: Deleting faulty DirectShowSpy registry key. Some users that use a 3rd party tool called DirectShowSpy may encounter errors when logging in to XSplit. This can be caused by a fault registry key that is introduced when DirectShowSpy is registered to…
A DirectShow developer complained on sudden failure of Core Audio IMMDevice::Activate call supposed to instantiate a DirectShow filter for a given device. The problem appeared to be related to installed DirectShowSpy and its interference with the API calls. The symptom was of the following kind: when Activate was called for different types of objects, the…
Some time ago DirectShowSpy received a capability to record media sample traces (in specific points of the pipeline). DirectShowSpy UI visualized the chronology of the streaming which facilitated detection of various problems, especially out of order media samples, lost or late delivered samples, thread racing conditions. A developer can easily integrate his filters with DirectShowSpy…
Overview DirectShow filters pass media samples (portions of data) through graphs and details of how the streaming happens exactly is important for debugging and troubleshooting DirectShow graphs and development. A developer needs clear understanding of parts of streaming process, importance of which increases with multiple streams, threads, parallelization, cut-off times, multiple graphs working simultaneously. Details…
DirectShow Spy is introducing integration with GraphStudioNext (and GraphEdit too) to let a developer quickly open a filter graph through Running Object table with external inspection tool. Note that you need a revision 301 GraphStudioNext or later, prebuilt versions available for download here: graphstudionext.exe (Win32), graphstudionext64.exe (x64). DirectShow Filter Graph list window offers context menu items and hotkeys to…