SolveigMM-Elecard MPEG2 Trimmer filter
The MPEG2 trimmer filter is a DirectShow transform filter. It does GOP and frame accurate trimming of MPEG2 video streams and compatible audio streams.
| Filter Interfaces | IBaseFilter, IModuleConfig, ISpecifyPropertyPages |
| Input Pin Media Types | MEDIATYPE_Video, MEDIASUBTYPE_MPEG2_VIDEO MEDIATYPE_Audio, MEDIASUBTYPE_NULL |
| Input Pin Interfaces | IPin, IMemInputPin |
| Output Pin Media Types | MEDIATYPE_Video, MEDIASUBTYPE_MPEG2_VIDEO MEDIATYPE_Audio, MEDIASUBTYPE_NULL |
| Output Pin Interfaces | IPin, IMemInputPin |
| Filter CLSID | CLSID_MP2_TRIM_FA |
| Property Page CLSID | CLSID_MP2_TRIM_FA_PPage, CLSID_MP2_TRIM_FA_About_PPage |
| Executable | SMM_MP2TrimmerFA.ax |
| Merit | MERIT_DO_NOT_USE |
| Filter Category | CLSID_LegacyAmFilterCategory |
| Declared in | PropID_MP2FATrimmer.h |
Requirements
The filter initially have no audio pins, you should first create the necessary pins.
Features
The filter's property page is shown on fig. 1 and includes the following control elements:
- Time intervals list and a set of buttons for its editing.
- Edit boxes for specifying start and stop time of each time interval (in DirectShow Reference Time units).
- Edit box for specifying the number of audio pins.
- To get the frame accuracy, tick the "Use index" button and specify the full index file name.
Usage
NOTE: All changes must be applied (using either APPLY button in Graph Editor or Apply method of IPropertyPage interface) to take place, the default values are used otherwise.
To use the filter manually:
- Add filter to a graph.
- Specify the appropriate audio pins number.
- Set the start and stop positions of the interval and use "Add Time" button to add the interval into the list. Add all necessary intervals like this.
- To get the frame accuracy, tick the "Use index" button and specify the full index file name.
- Build and run the graph.
To use programmatically not using property page:
The following section describes the Parameter GUIDs declared in the PropID_MP2FATrimmer.h header file to be used for tuning the SolveigMM-Elecard MPEG2 Trimmer DirectShow Filter by means of the IModuleConfig interface.
The following table provides an overview of the Parameter GUIDs of SolveigMM-Elecard MPEG2 Trimmer DirectShow Filter:
| Parameter GUID | Value type | Description |
| SM2TFA_TrimList | VT_BYREF | VT_UI1 | Sets trimming parameters |
| SM2TFA_AudioPinsNum | VT_I4 | Sets a number of audio pins to be created |
| SM2TFA_Duration | VT_I4 | Gets stream duration |
| SM2TFA_MPEG2IndexFileName | VT_BSTR | Specifies the index file name. |
| SM2TFA_UseMPEG2Index | VT_BOOL | Specifies weather to use the MPEG2 Index file. |
| SMAT_3rdParty | VT_BSTR | Specifies the unique GUID to activate the Elecard filters. |
| SMAT_TrimAccuracy | VT_I4 | Sets/Gets the trim accuracy. |
| SMAT_SilentPath | VT_BSTR | Sets the silent path. |
| SMAT_CodecsSet | VT_BSTR | Sets the profile. |
SM2TFA_TrimList
GUID:
{DC273F41-3A44-425d-82C4-A042D104FE3A}
Description:
Used to set/retrieve the trimming intervals list. Poiter to the TrimInfoList structure is used as an input parameter.
Type:
VT_BYREF | VT_UI1 (pbVal)
SM2TFA_AudioPinsNum
GUID:
{676545BA-D057-460a-BFD2-BF3F231F8094}
Description:
Used to set the desired quantity of audio pins. Default value is 0.
Type:
in - VT_I4 (lVal)
SM2TFA_Duration
GUID:
{9B6F30DC-1E87-41f8-A328-5E8B7D5CAFCB}
Description:
Set/Retrieve the type of the output file (member of the SMM_OutputTypes enumeration). If this parameter isn't set the graph wouldn't start.
Type:
VT_INT (intVal)
SM2TFA_MPEG2IndexFileName
GUID:
See SMAT_MPEG2IndexFileName
Description:
Set/Retrieve the MPEG2 index file name.
Type:
VT_BSTR (bstrVal)
SM2TFA_UseMPEG2Index
GUID:
{65746723-2112-4ede-9326-F3AD9D658DC4}
Description:
Specifies weather to use the MPEG2 Index file.
Type:
VT_BOOL (boolVal)
SMAT_3rdParty
GUID:
{69F77066-D77C-4c8e-A39B-966E5BD4D17F}
Description:
Specifies the unique GUID to activate the Elecard filters. The GUID should be a BSTR value like {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}.
Type:
VT_BSTR (bstrVal)
SMAT_TrimAccuracy
GUID:
{4B07D80A-0FA6-4d69-8438-159CB1BC749F}
Description:
Sets/Gets trim accuracy mode.The parameter should be a member of SMM_TrimmAccuracyType.
Type:
VT_I4 (lVal)
SMAT_SilentPath
GUID:
{2E83B26B-65B3-4609-95B5-E918A96AE151}
Description:
Sets the silent path (which is a registry key containing the information about silent filters).
Type:
VT_BSTR (bstrVal)
SMAT_CodecsSet
GUID:
{17B25796-46AB-44a6-BBF4-9A3A160E63FB}
Description:
Sets the profile defining which filters should be used.
Type:
VT_BSTR (bstrVal)