I have a client in need of an application that uploads a powerpoint file to a web app that can display the slides as jpegs (or flash, silverlight, HTML, video.. any format really) using ASP.NET.
I built the application with MVC in VS 2010 using Office developer tools but the clients server does not have Powerpoint and it seems the Microsoft.Office.Interop.Powerpoint assembly won't function if it can't call Powerpoint on the host machine.
I've looked at every possible discussion dealing with this, the majority conclude its bad practice to even have Powerpoint deployed on a server, so my question is does anyone know of a utility that can convert PPT slide to JPG or Flash or anything to present the slides on a website?
Here it is with the use of Interop object..
private void mConvertPPT_To_Images(string sPPTFilePath, string sImagesDirectoryPath)
{
try
{
Microsoft.Office.Interop.PowerPoint.Application appPpt = new Microsoft.Office.Interop.PowerPoint.Application();
Microsoft.Office.Interop.PowerPoint.Presentation objActivePresentation
= appPpt.Presentations.Open(sPPTFilePath,
Microsoft.Office.Core.MsoTriState.msoCTrue,
Microsoft.Office.Core.MsoTriState.msoTriStateMixed,
Microsoft.Office.Core.MsoTriState.msoFalse);
//objActivePresentation.SaveAs(sImagesDirectoryPath, PpSaveAsFileType.ppSaveAsJPG, MsoTriState.msoFalse);
//objActivePresentation.Export(sImagesDirectoryPath + #"\Slide1.png", "png", 960, 720);
//objActivePresentation.SaveAs(sImagesDirectoryPath + "slide", PpSaveAsFileType.ppSaveAsTIF, MsoTriState.msoFalse);
int i = 0;
foreach (Microsoft.Office.Interop.PowerPoint.Slide objSlide in objActivePresentation.Slides)
{
//Names are generated based on timestamp.
//objSlide.Export("Slide" + i, "PNG", 960, 720);
objSlide.Export(sImagesDirectoryPath + #"\Slide" + i + ".GIF", "GIF", 960, 720);
i++;
}
objActivePresentation.Close();
appPpt.Quit();
}
catch (Exception ex)
{
throw;
}
}
There’s a solution by iSpring called iSpring Platform (http://www.ispringsolutions.com/ispring-platform). This is an SDK that allows software using .NET to convert PPT presentations to HTML5 and Flash. It supports all the effects, animations, and other PowerPoint stuff.
P.S. Looked at the post data and realized that the author had probably found the solution. Maybe my answer will be of use for someone else.
Related
I created win forms app to convert docx to html using pandoc, and a web browser control
to display the html file. This application is much needed for my colleagues in the university,
to preview docx files since we dont have MS Office access any more...
I tested this at my PC and it is working fine on each item click in the listbox,
it loads the preview in webbrowser quicky. But I just want to make it more quick, is there
any recommendations to make it faster (I can provide full code if needed), but the following
is the main listbox selected item changed event:
Also tell me which one is faster from: setting wb.DocumentText as blank or navigate it to about:blank page
private void lbFiles_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
wb.DocumentText = "";
// Two string lists
SelectedFile = AllFiles[lbFiles.SelectedIndex];
NameOnly = AllNamesOnly[lbFiles.SelectedIndex];
if (NameOnly.EndsWith(".txt") || NameOnly.EndsWith(".docx"))
{
#region MediaFolder
if (Directory.Exists("MF")) Directory.Delete("MF", true);
Directory.CreateDirectory("MF");
#endregion
string cmd = "pandoc --extract-media ./MF \"" + SelectedFile + "\" -o " + "output.html";
File.WriteAllText("BatchFile.bat", cmd);
StartHidden("BatchFile.bat"); //Process object with: ProcessWindowStyle.Hidden; and with 3 seconds exit wait
wb.Navigate(Environment.CurrentDirectory + "\\" + "output.html");
}
}
catch(Exception ex) { throw ex; }
}
I tried hard with various solutions.
Most of them were not free, so were not useable, using pendoc as in OP, was not
feasible since it doesn't support the variety of fonts and formats
After going through many possible alternatives (Gembox, Spire.Doc, etc.),
I finally moved to Syncfusion community edition it is already free and its libraries allow to convert all major word processor based formats and its result was same as other non-free solutions. And works faster then pandoc.
Another thing to note is, I switched from WebBrowser to CefSharp as well, as its faster and lighter than WebBrowser, and it works better for pdf file
previews in browser (you can use zoom level, page number as part of URL)
I'm working on an app that has video streaming functionality. I'm using firebase database and firebase storage. I'm trying to find some documentation on how firebase storage handles video files, but can't really find much.
There's mentioning in the docs that firebase storage works with other google app services to allow for CDN and video streaming, but all searches seem to lead to a dead end. Any advice?
I think there are several types of video streaming, which could change our answer here:
Live streaming (subscribers are watching as an event happens)
Youtube style (post a video and end users watch at their convenience)
Having built a live streaming Periscope style app using Firebase Storage and the Firebase Realtime Database, I pretty strongly recommend against it--we uploaded three second chunks and synced them via the Realtime Database. While it worked (surprisingly well), there was ~5 second latency over very good internet, and it also wasn't the most efficient solution (after all, you're uploading and storing that video, plus there wasn't any transcoding). I recommend using some WebRTC style, built for video transport, and using the Realtime Database for signaling along side the stream.
On the other side, it's definitely possible to build mobile YT on Firebase features. The trick here is going to be transcoding the video (using something like Zencoder or Bitmovin, more here: https://cloud.google.com/solutions/media/) to chop up your uploaded video into smaller chunks of different resolutions (and different formats, iOS requires HLS for streaming, for instance). You client can store chunk information in the Realtime Database (chunk name, resolutions available, number of chunks), and can download said chunks from Storage as the video progresses.
If you want to steam a video from Firebase Storage, this is the best way I found. This will depend on the size of your video file. I'm only requesting 10-30mb files so this solution works good for me. Just treat the Firebase Url as a regular url:
String str = "fire_base_video_URL";
Uri uri = Uri.parse(str);
videoViewLandscape.setVideoURI(uri);
progressBarLandScape.setVisibility(View.VISIBLE);
videoViewLandscape.requestFocus();
videoViewLandscape.start();
If you want to loop the video:
videoViewLandscape.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
#Override
public void onPrepared(MediaPlayer mp) {
mp.setLooping(true);
}
});
And if you want to show a progress bar before the video starts do this:
videoViewLandscape.setOnInfoListener(new MediaPlayer.OnInfoListener() {
#Override
public boolean onInfo(MediaPlayer mp, int what, int extra) {
if (what == MediaPlayer.MEDIA_INFO_BUFFERING_END) {
progressBarLandScape.setVisibility(View.GONE);
return true;
}
else if(what == MediaPlayer.MEDIA_INFO_BUFFERING_START){
progressBarLandScape.setVisibility(View.VISIBLE);
return true;
}
return false;
}
});
This is not the best way of doing things but it works for me for now until I can find a good video streaming service.
2020: Yes, firebase storage video streaming is easy and possible.
All other questions suggest that you use a protocol like HLS. However, this is only necessary if you develop an app for the Apple AppStore that serves videos that are longer than 10 minutes.
In all other cases, you can simply encode your videos in mp4 and upload them to firebase. Your clients can then stream the mp4 without a problem. Just make sure that your moov atom is at the beginning of your mp4 file. This allows to start playing the video immediately, even if it is not fully loaded.
Users can also skip ahead or go back thanks to variable bit requests which are supported by firebase storage.
To test it, just upload a video to your firebase storage and open it in your browser.
You can host HLS videos on Firebase Cloud Storage. It works pretty well for me.
The trick is to modify the playlist .m3u8 files to contain the storage folder prefix, and the ?alt=media suffix for each file entry in the playlist:
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:2.760000,
<folder_name>%2F1_fileSequence_0.ts?alt=media
#EXT-X-ENDLIST
You also don't really have to use server-side transcoding, you can have the client who uploads the video do it, and save considerable costs.
I've written a full tutorial with source code here: https://itnext.io/how-to-make-a-serverless-flutter-video-sharing-app-with-firebase-storage-including-hls-and-411e4fff68fa
this is my exact implementation for it to start a video playing from storage on firebase as soon as the view is open, and then have the view disappear and then addded a button to click after to replay the video.
I have a demo link with the key so you can see it works. any questions hit me up.
you will just have to create a IBAction if you want the button after the video disappears.
// BackMuscles.swift
// Messenger
//
// Created by Zach Smith on 8/12/21.
// Copyright © 2021 spaceMuleFitness. All rights reserved.
//
import UIKit
import AVKit
import AVFoundation
class BackMuscles: UIViewController {
#IBOutlet weak var playv: UIButton!
let avPlayerViewController = AVPlayerViewController()
var avPlayer:AVPlayer?
override func viewDidLoad() {
super.viewDidLoad()
self.view.addBackground()
let movieUrl:NSURL? = NSURL(string: "https://firebasestorage.googleapis.com/v0/b/messenger-test-d225b.appspot.com/o/test%2FTestVideo.mov?alt=media&token=bd4ccba3-b446-43bc-809e-b1152aa3c2ff")
if let url = movieUrl {
self.avPlayer = AVPlayer(url: url as URL)
self.avPlayerViewController.player = self.avPlayer
}
NotificationCenter.default.addObserver(self, selector: #selector(playerDidFinishPlaying), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: avPlayerViewController.player?.currentItem)
self.present(self.avPlayerViewController, animated: true) { () -> Void in
self.avPlayerViewController.player?.play() // Do any additional setup after loading the view.
}
}
#objc func playerDidFinishPlaying(note: NSNotification) {
self.avPlayerViewController.dismiss(animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func playV(sender: UIButton) {
let amovieUrl:NSURL? = NSURL(string: "https://firebasestorage.googleapis.com/v0/b/messenger-test-d225b.appspot.com/o/test%2FTestVideo.mov?alt=media&token=bd4ccba3-b446-43bc-809e-b1152aa3c2ff")
if let aurl = amovieUrl {
self.avPlayer = AVPlayer(url: aurl as URL)
self.avPlayerViewController.player = self.avPlayer
self.present(self.avPlayerViewController, animated: true) { () -> Void in
self.avPlayerViewController.player?.play()
}
}
}
}
If you want to create a YT like app, you can first compress the video, I recommend using this library to manage video compression, i recommend the one in this link. I've manage to compress a video of 118 mg to 6 mg in under 42 seconds. It also has a great demo app, just follow the example.
After you get the compressed file upload the file to Storage, in you client app you will play the video url using a player like Exo Player.
The video below is pretty good it uses exoplayer to stream instead of mediaplayer or videoViewLanscape
https://www.youtube.com/watch?v=s_D5C5e2Uu0
try{
BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
TrackSelector trackSelector = new DefaultTrackSelector(new AdaptiveTrackSelection.Factory(bandwidthMeter));
simpleExoPlayer = ExoPlayerFactory.newSimpleInstance(this, trackSelector);
String vid = "https://www.youtube.com/watch?v=s_D5C5e2Uu0";
Uri uri= Uri.parse(vid);
DefaultHttpDataSourceFactory dataSourceFactory = new DefaultHttpDataSourceFactory("exoplayer_video");
ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
MediaSource mediaSource = new ExtractorMediaSource(uri,dataSourceFactory,
extractorsFactory, null, null);
videoView.setPlayer(simpleExoPlayer);
simpleExoPlayer.prepare(mediaSource);
simpleExoPlayer.setPlayWhenReady(true);
}
catch (Exception e){
}
The below is the implements in the buid gradle app file that you will need.
implementation 'com.google.android.exoplayer:exoplayer:r2.4.0'
implementation 'com.google.android.exoplayer:exoplayer-core:r2.4.0'
implementation 'com.google.android.exoplayer:exoplayer-dash:r2.4.0'
implementation 'com.google.android.exoplayer:exoplayer-hls:r2.4.0'
implementation 'com.google.android.exoplayer:exoplayer-smoothstreaming:r2.4.0'
implementation 'com.google.android.exoplayer:exoplayer-ui:r2.4.0'
To use firestorage to play videos, all you need is the full url to the video. You then pass this url into a video view or exoplayer. No full download is needed. The videoview will stream the content YT style
see first of all you need to understand firebase rules okay
like make it true for development mode
then you have to create a storage reference for storing videos in your app
okay
then you have to select video you want to upload okay
then use Uploadtask for creating a task
and upload video file in storage
now for retrieving video use exoplayer library in android
you can visit here for more
I've searched high and low for a class that'll allow me to connect to a DDE server. Whilst I'm aware that DDE is dated and better methods exist, they don't for what I want to connect to.
I found this which apparently works in QT 3, and unfortunately I lack the knowledge of differences to update it to QT 4.
Does anybody have an updated version, the time to update or another solution?
I know this ancient but to whoever gets here you need to make a small change to that code:
void DDEComm::ddeDisconnect()
{
DdeDisconnect(hConv);
DdeUninitialize(pidInst);
connStatus = false;
}
should become
void DDEComm::ddeDisconnect()
{
DdeDisconnect(hConv);
DdeUninitialize(pidInst);
connStatus = false;
pidInst = 0;
}
I am having the hardest time figuring this problem out. I have a Silverlight 4 application that loads audio and video files from URLs. The URLs are the same domain as the application is hosted on and it works great for video.
The URLs are actually asp.net mvc controllers that are responsible for reading the file from a shared location on and the server and serving back a filestream. The URLs look something like this:
http://localhost:31479/CourseMedia?path=\omnisandbox1\ILMSShare2\Demo-Fire+Behavior\media\Disclaim.wma&encrypted=False&id=00000000-0000-0000-0000-000000000000
If I put the URL directly into the browser the file loads and plays in windows media player just fine, and if I use a separate test silverlight project to load the url it also works, but for the life of me I can not get it to work properly in my main project.
This is the routine I use to actually do the source setting:
protected void SetPlayerURL(MediaElement player, string url)
{
if (player != null && url.Length > 0)
{
player.ClearValue(MediaElement.SourceProperty);
player.Source = new Uri(this.Packet.GetMediaUrl(url, false, Guid.Empty));
}
}
and the GetMediaURL function simply builds the URL format seen above:
public string GetMediaUrl(
string path,
bool encrypted,
Guid key)
{
StringBuilder builder = new StringBuilder();
builder.AppendFormat("http://{0}/CourseMedia?path={1}&encrypted={2}&id={3}",
this.Host,
System.Windows.Browser.HttpUtility.UrlEncode(path),
encrypted,
key);
return builder.ToString();
}
The request to the controller is never made for the media when it is audio. Seems odd to me as this exact code works fine for video. The MediaElement state never leaves "Closed" and the CurrentStateChanged,, MediaOpened, and MediaFailed events are never triggered.
I am at a loss!
Try setting ScrubbingEnabled of the MediaElement to false, there were some problems with Framework version 3.5 and audio and the workaround was setting that to false. Might be worth trying.
Also try capturing BufferingStarted, BufferingEnded, MediaEnded along with your MediaFailed and MediaOpened events. I'm curious if it is a buffering issue.
One of the features of the Flash app I'm working on is to be able to stream a webcam to others. We're just using the built-in webcam support in Flash and sending it through FMS.
We've had some people ask for higher quality video, but we're already using the highest quality setting we can in Flash (setting quality to 100%).
My understanding is that in the newer flash players they added support for MPEG-4 encoding for the videos. I created a simple test Flex app to try and compare the video quality of the MP4 vs FLV encodings. However, I can't seem to get MP4 to work at all.
According to the Flex documentation the only thing I need to do to use MP4 instead of FLV is prepend "mp4:" to the name of the stream when calling publish:
Specify the stream name as a string
with the prefix mp4: with or without
the filename extension. The prefix
indicates to the server that the file
contains H.264-encoded video and
AAC-encoded audio within the MPEG-4
Part 14 container format.
When I try this nothing happens. I don't get any events raised on the client side, no exceptions thrown, and my logging on the server side doesn't show any streams starting.
Here's the relevant code:
// These are all defined and created within the class.
private var nc:NetConnection;
private var sharing:Boolean;
private var pubStream:NetStream;
private var format:String;
private var streamName:String;
private var camera:Camera;
// called when the user clicks the start button
private function startSharing():void {
if (!nc.connected) {
return;
}
if (sharing) { return; }
if(pubStream == null) {
pubStream = new NetStream(nc);
pubStream.attachCamera(camera);
}
startPublish();
sharing = true;
}
private function startPublish():void {
var name:String;
if (this.format == "mp4") {
name = "mp4:" + streamName;
} else {
name = streamName;
}
//pubStream.publish(name, "live");
pubStream.publish(name, "record");
}
Would be helpful to know the version of FMS you are running?
It seems like you need at least FMS 3.0.2.
Are you sure this applies to live streams and not only for recording? this 1 2 links suggest that while the player can decode sorenson, vp6 and h264, it can only encode in sorenson.
I'm in a similar situation, so I would like to have this clarified.
edit: what actually makes me doubt is that the documentation says flv and mp4, which arent codecs but containers, live streaming doesnt use containers, the encoded frames travel directly inside rtmp packets
Flash Player doesn't encode using H.264, but Flash Media Server can record any codec in the F4V container. Flash Media Live Encoder can encode using H.264.
So basically you can't send h264 from web flash player (yet?)...