[mythtv] Where is thumbnail generation done?

[Nigel Pearson]

	Sorry for the delay in replying.


1) Crashing should always be investigated with a debugger
(e.g. gdb). There is a section in the doco to help you.
(although recompiling with debug can take a while)



> Can anybody give me a hint about how thumbnails are generated?

	Not much, but a quick search reveals:

% find . -name \*.cpp -exec egrep -i thumb {} \; -print
   *ptr++ = 0x00; *ptr++ = 0x00; // no thumbnail
./libs/libmythlivemedia/liveMedia/JPEGVideoRTPSource.cpp
     /* Delete preview thumbnail. */
./programs/mythbackend/mainserver.cpp
     // Add Thumbnail Resource
./programs/mythbackend/upnpcdstv.cpp
     gc->setLabel(QObject::tr("Display thumbnail preview images of "
     bs->setLabel(QObject::tr("Time offset for thumbnail preview  
images"));
                     "thumbnail image this many seconds from the  
beginning "
                     "as the offset for creating a thumbnail image. "
./programs/mythfrontend/globalsettings.cpp


	s/thumb/Preview Image/:

% find . -name \*.cpp -exec egrep -i 'preview.*image' {} \; -print
*  \brief This class creates a preview image of a recording.
./libs/libmythtv/previewgenerator.cpp
     if (sURI == "getPreviewImage"      ) return( HSM_GetPreviewImage );
                 case HSM_GetPreviewImage: GetPreviewImage 
( pRequest ); return( true );
void HttpStatus::GetPreviewImage( HTTPRequest *pRequest )
     // check to see if preview image is already created.
         // Must generate Preview Image
         // Generate Preview Image and save.
./programs/mythbackend/httpstatus.cpp
                 "find file locally, unable to make preview image.");
         VERBOSE(VB_IMPORTANT, "MainServer: Failed to make preview  
image.");
./programs/mythbackend/mainserver.cpp
     sURI = QString( "%1getPreviewImage%2").arg( sURIBase   )
./programs/mythbackend/upnpcdstv.cpp
     gc->setLabel(QObject::tr("Display thumbnail preview images of "
     bs->setLabel(QObject::tr("Time offset for thumbnail preview  
images"));
     gc->setLabel(QObject::tr("Generate preview image from a bookmark "
         QImage* previewImage = new QImage(preview.absFilePath());
         if (previewImage->width() == 0 || previewImage->height() ==  
0) {
             cout << QObject::tr("Problem reading theme preview image ")
         addImageSelection(theme->fileName(), previewImage);
./programs/mythfrontend/globalsettings.cpp
       // Preview Image Variables
             previewPixmap->convertFromImage(tmp2);
             previewPixmap->convertFromImage(*image);
./programs/mythfrontend/playbackbox.cpp

%


2) Have a look in libs/libmythtv/previewgenerator.cpp,
or programs/mythbackend/mainserver.cpp ?
Just compiling those with debug symbols should be
enough to get more useful output from gdb



Good luck!

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