MICROSOFT_PRESS_EBOOK_PROGRAMMING_WINDOWS_8_APPS_WITH_HTML_CSS_AND_JAVASCRIPT_PDF

getPresetProfile(id("profileSelect"));
// Create output file and transcode.
var videoLib = Windows.Storage.KnownFolders.videosLibrary;
var createFileOp = videoLib.createFileAsync(g_outputFileName,
Windows.Storage.CreationCollisionOption.generateUniqueName);
createFileOp.done(function (ofile) {
g_outputFile = ofile;
g_transcodeOp = null;
var prepareOp = transcoder.prepareFileTranscodeAsync(g_inputFile, g_outputFile,
g_profile);
}
prepareOp.done(function (result) {
if (result.canTranscode) {
g_transcodeOp = result.transcodeAsync();
g_transcodeOp.done(transcodeComplete, transcoderErrorHandler,
transcodeProgress);
} else {
transcodeFailure(result.failureReason);
}
}); // prepareOp.done
id("cancel").disabled = false;
}); // createFileOp.done
The getPresetProfile method retrieves the appropriate profile object according to the option
selected in the app. For the selections shown in Figure 10-7 (WMV and WVGA), we’d use these parts of
that function:
function getPresetProfile(profileSelect) {
g_profile = null;
var mediaProperties = Windows.Media.MediaProperties;
var videoEncodingProfile;
}
switch (profileSelect.selectedIndex) {
// other cases omitted
case 2:
videoEncodingProfile = mediaProperties.VideoEncodingQuality.wvga;
break;
}
if (g_useMp4) {
g_profile = mediaProperties.MediaEncodingProfile.createMp4(videoEncodingProfile);
} else {
g_profile = mediaProperties.MediaEncodingProfile.createWmv(videoEncodingProfile);
}
450