Some ASF and WMV file do not have indexes. That cause seeking issues. You can use VisioForge.Tools.ASFIndexer class to index files.
C# sample usage:
var indexer = new ASFIndexer();
indexer.OnStop += delegate(object o, EventArgs args)
{
MessageBox.Show("Indexing complete.");
};
indexer.OnError += delegate(object o, ErrorsEventArgs args)
{
MessageBox.Show("Error during indexing: " + args.Message);
};
indexer.OnProgress += delegate(object o, ProgressEventArgs args)
{
Debug.WriteLine("Indexing progress: " + args.Progress);
};
indexer.Start(@"c:\samples\sample.asf", VFWMIndexerType.FrameNumbers, 4000, VFWMIndexType.NearestDataUnit);
