c# - How do i loop thorugh all double positions to save all frames to hard disk? -

i'm using framegrabber.cs , added dll reference: jockersoft.media.dll , interop.qedit.

now in form1 code in constructor i'm trying retrieve frames in position , save each frame new bitmap file on hard disk can't figure out how it.

i don't know how loop through frames/double[] position wanted see information how many frames there framerate 17.8....

i want list/array of frames , save each frame hard disk , manipulations on frames.

this site got example from. tried there , on source code couldn't figure out how it.

** have trackbar1 in designer wanted able scroll through frames doesn't work good.

this form1 code doesn't work can 1 frame.

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.windows.forms; using extractframes.properties; using extractframes; using jockersoft.media; using jockersoft; using interop.qedit; using interop; using system.runtime.interopservices;  namespace extractframes {     public partial class form1 : form     {         double x;         string sf;         double[] streamdouble ;         string strvideofile;         public form1()         {             initializecomponent();             sf = @"d:\frames\";             strvideofile = @"d:\my movie.wmv";             (int x = 0; x < 40; x++)             {                 streamdouble = new double[x];                 saveframesfromvideo(strvideofile, streamdouble, sf + x.tostring("d6") + ".bmp");             }             //getframerate();         }          private void form1_load(object sender, eventargs e)         {          }          private  void getframerate()         {             // framerate             mediadet md = new mediadet();             md.filename = strvideofile;             //md.currentstream = 0;                     // choose video stream             x = md.framerate;             double = md.streamlength;          }          public static void saveframesfromvideo(string videofile, double[] positions, string outputbitmapfiles)         {             if (videofile == null)                 throw new argumentnullexception("videofile");              double streamlength;              imediadet mediadet = null;             try             {                 _ammediatype mediatype;                 if (openvideostream(videofile, out mediadet, out mediatype))                 {                     streamlength = mediadet.streamlength;                     size target = getvideosize(mediatype);                     int iteration = 0;                     foreach (double position in positions)                     {                         iteration++;                         string outputbitmapfile = string.format(outputbitmapfiles, iteration);                         mediadet.writebitmapbits(position, target.width, target.height, outputbitmapfile);                     }                     return;                 }             }             catch (comexception ex)             {                 throw new invalidvideofileexception();             }                         {                 if (mediadet != null)                     marshal.releasecomobject(mediadet);             }              throw new invalidvideofileexception("no video stream found");         }           private static size getvideosize(_ammediatype mediatype)         {             winstructs.videoinfoheader videoinfo = (winstructs.videoinfoheader)marshal.ptrtostructure(mediatype.pbformat, typeof(winstructs.videoinfoheader));              return new size(videoinfo.bmiheader.biwidth, videoinfo.bmiheader.biheight);         }          private static size scaletofit(size target, size original)         {             if (target.height * original.width > target.width * original.height)                 target.height = target.width * original.height / original.width;             else                 target.width = target.height * original.width / original.height;              return target;         }         private static size scaletofitsmart(size target, size original)         {             target = scaletofit(target, original);              if (target.width > original.width || target.height > original.height)                 return original;              return target;         }           private static bool openvideostream(string videofile, out imediadet mediadet, out _ammediatype ammediatype)         {             mediadet = new mediadet();              //loads file             mediadet.filename = videofile;              //gets # of streams             int streamsnumber = mediadet.outputstreams;              //finds video stream             (int = 0; < streamsnumber; i++)             {                 mediadet.currentstream = i;                 _ammediatype mediatype = mediadet.streammediatype;                  if (mediatype.majortype == jockersoft.media.mayortypes.mediatype_video)                 {                     //video stream found                     ammediatype = mediatype;                     return true;                 }             }              //no video stream found             marshal.releasecomobject(mediadet);             mediadet = null;             ammediatype = new _ammediatype();             return false;         }        }   } 

the saveframesfromvideo() method expects double array filled percentage position in file in seconds - since don't know how relates length of video cannot use frame rate alone. can save frame @ each full percentage file:

var streamdouble = new double[1]; (int x = 0; x < 100; x++) {     streamdouble[0] = x;     saveframesfromvideo(strvideofile, streamdouble, sf + x.tostring("d6") + ".bmp"); } 

if need wmv files use asfmojo instead - complete solution this:

asffile asffile = new asffile(@"d:\samples\sample.wmv"); asffileproperties fileproperties = asffile.getasfobject<asffileproperties>(); timespan duration = timespan.fromticks((long)fileproperties.playduration) - timespan.frommilliseconds(fileproperties.preroll);  var streamprops = asffile.getasfobjects<asfextendedstreamproperties>()                          .singleordefault(x => x.streamnumber == asffile.packetconfiguration.asfvideostreamid);  double timeperframe = streamprops.avgtimeperframe / (double) 10000000 ;  double offset = 0; while (offset < duration.totalseconds) {     using (var bitmap = asfimage.fromfile(@"d:\samples\sample.wmv").atoffset(offset))     {         if(bitmap!=null)             bitmap.save(string.format(@"d:\frames\{0}.jpg", offset.tostring("n")), imageformat.jpeg);     }     offset += timeperframe; }