I have a custom Flash video player that uses the NetConnection and NetStream classes to stream mp4 files from a Wowza server.
Lately the playback has been having audio problems. The sound is crackled and in some cases may cause the Flash player to crash. This is not consistent between files. Meaning that a file that was played once with bad audio could be fine 5 minutes later when played again from a new instance of the player , but 5 minutes later have the same problem.
My thought direct me to thinking this was an encoding problem, but that wouldn't explain how one second the playback is fine, and once refreshed messes up again.
I should note that the Wowza server does not stream the entire file but only a portion of it based on various parameters it gets.
Any help would be greatly appreciated.
Do you get the audio crackle when you use a standard player and/or a different client machine? My first thought is that this is a custom player or client sound processing issue.
If this reproduces on any player or client, then we should also troubleshoot the server. If you end up thinking it might be server-related, please post a message on the Wowza forum: http://www.wowza.com/forums/forum.php.
Related
Is there anyway to buffer video in a Windows Phone 8 app?
I want to create an app that buffers the last 30 seconds or so of video so that the user can tap the screen and get a video file that includes the 30 seconds of video taken prior to their tapping the screen.
I've looked at both the .NET CaptureSource API, and the WP8 only AudioVideoCaptureDevice, both look like they record directly to a file on IsolatedStorage:
For CaptureSource you use a FileSink object to write an mp4 file of your recorded video.
For AudioVideoCaptureDevice you can write to a RandomAccessStream. WP8 doesn't have the InMemoryRandomAccessStream though, so the only way I see to get a RandomAccessStream is to create one from a storage file.
For CaptureSource you could write your own VideoSink class to buffer your video and use that instead of FileSink, but then you you would be stuck working with the Raw video data, and you'd have to write your own encoder to get it into a formal like an mp4.
Is there anything I'm missing, or is buffering video just not possible on WP8 unless you write your own encoder?
I'm not sure you can do This... for various reasons... Maybe you can cache video in memory, making your own implementation of IRandomAccessStream but... as you noted, you need to play in first instance with RAW video, and depending resolution, 30 seconds of raw video and audio can weight more than the total allowed memory for the application so you can had your app closed by the system.
I don't know if you can use a mediaelement to play the video Without showing it to the user and when the user click on play, rewind to Start position and show it to the user, as OS automatically cache streamed videos (This is a happy idea... i don't test This in anyway....)
Sorry for not begin more useful :(
I am trying to develop a test taking website for students. In this website, students should be able to answer the questions(displayed in text format) by using webcam in one go. Currently I have implemented this feature using Flash, it captures the frames and simultaneously sends it to the server. The problem with this technique is that the quality(FPS) of my video is restricted and is dependent on the bandwidth of the internet connection. Also I am not in favor of using flash.
I want that as soon as student clicks on the start button, a timer should start to record the video. The video should get saved on the client's machine (without asking the client to mention the path) and on completion of video, it should automatically get uploaded on the server and when uploading gets completed, the video should be automatically deleted from the client's machine.
In short can anyone give me a starting point, so as to I can proceed with the work. Any helo will be highly appreciated.Thanks!
Here is a good example how to get webcam working on html5:
http://blog.teamtreehouse.com/accessing-the-device-camera-with-getusermedia
It doesnt tell how to upload the video to the server.
Currently I have implemented this feature using Flash, it captures the frames and simultaneously sends it to the server. The problem with this technique is that the quality(FPS) of my video is restricted and is dependent on the bandwidth of the internet connection.
That is actually incorrect.
The fps you're getting depends 100% on:
the webcam quality
the light available in the room (the more light the better)
The resolution you're recording at (lower res results in higher fps even with low quality webcams in low light)
The video should get saved on the client's machine (without asking the client to mention the path) and on completion of video, it should automatically get uploaded on the server and when uploading gets completed, the video should be automatically deleted from the client's machine.
Flash records by streaming (through rtmp) the audio/video data to a media server (Red5, AMS, Wowza). After the recording is stopped you could move the file to a web server and trigger a http download.
In what regards HTML the Media Recording API has been implemented by Firefox and Chrome 49 and it allows you to record to local RAM and download the file as .webm (the audio video codecs might differ btwn browsers).
Disclaimer: I work at Pipe which handles video recording.
Is it possible to play an MP4/H.264 movie in flash from half way thru?
Currently cant figure out how to seek to a time that hasn't buffered yet. Is there anyway of getting flash to start buffering half way into a movie?
edit:
The moov atom has already been set at the beginning of the MP4 file.
use pseudo-streaming
Normally you need a to use an streaming server which cost $$$ but you can use Pseudo-streaming.
Pseudo-streaming uses server-side scripts/modules where you have the server slice up the movie starting at the point you want to start from and wrap it as an mp4.
Stream your videos with standard HTTP servers
Pseudo-streaming (another article)
Oh yeah, I forgot about red5 as mentioned below in the comments. That is a free media server option for real streaming.
red5.org
I'm currently working on a dynamic MP3 player in AS3. The player will also support continuous (in length) radio streams.
Because my player will include a 'seek' bar, I allow the user to seek through the Sound object's data. Now I know that with a continuous stream, data being stored on the users RAM will never stop, as downloading will never stop on a continuous stream. This means, after a few hours of streaming, allot of RAM is being used by my app. I've tested the app on my own machine, running a very high spec, and the app crashes in my browser. When i say the app crashes, I mean the whole of Flash, meaning I have to restart my browser in order to use Flash again. I know my app is the cause as Flash has never crashed in the past. It only does it when my app has been streaming for 2+ hours.
So what I want to do is only allow the user to cache up to an hours worth of audio. After an hour, I want to clear the first half of the sound objects data, meaning that only the most recent half hours audio is stored and available for seeking.
So I have my stream:
var soundObj:Sound = new Sound();
soundObj.load(new URLRequest('stream.mp3'));
//ect ect
and sound is where the data is stored. So my question: How would I clear the first 30 mins of audio from that object?
Perhaps the Sound class is not meant to reliably play "unlimited" MP3 files, which seems to be your case. It is made to play normal MP3 "songs". Two hours of MP3 sound can easily accumulate to be larger than 200 megabytes of data.
But there is a good solution - use NetConnection and NetStream classes to stream audio instead. There are many tutorials out there. You will also be able to stream your MP3s, just a bit differently - a central server will be involved, which will transcode these MP3s on the fly, delivering it to you in a true "streaming" manner. One of such servers is Adobe Flash Media Server, an overpriced piece of work from Adobe. A lot of free and open-source alternatives exist which will work fine for your purposes - Red5, nginx-rtmp to name a few, that I have tested myself.
So, I'm working with a video source that I'm feeding into my Adobe AIR application via some native extension work, with the goal of ultimately getting it to a Flash Media Server. The video is H.264 encoded and muxed into a FLV container, which aligns me with supported Flash Media Server codecs and NetStream (appendBytes) requirements. I can get the data into AIR just fine.
The mine I stepped onto today, however, is that documentation for NetStream.appendBytes states I must call NetStream.play(null):
Call this method on a NetStream in "Data Generation Mode". To put a NetStream into Data Generation Mode, call NetStream.play(null) on a NetStream created on a NetConnection connected to null. Calling appendBytes() on a NetStream that isn't in Data Generation Mode is an error and raises an exception.
NetStream.play() called with a null parameter yields local FLV playback. I can't publish the stream to FMS in this mode. But my research into Flash seems to indicate NetStream's byte access is my only real hope here when dealing with non-camera or non-web video data.
Q: Can I latch onto the video playback buffer for publish to a FMS? Can I create a sort of pipeline of NetStreams or NetConnections to achieve this? Or is there an alternate approach here for transmitting H.264/FLV data to FMS? (The source of my video cannot communicate with FMS directly.)
The answer to your question is quite simply no. This is apparently implemented as a security feature, which is probably less of a security based issue and more of a sales issue. Adobe likes to block certain capabilities intentionally in order to create the possibility of, or need of another product aka more revenue.
I tried looking into this for you to see if there was some dirty hack where you could attach a camera or something and override the binary data being sent to the stream like you can with Audio but unfortunately, to my knowledge, no such hack is possible. More nfo here: NetStream.appendBytes
Update
You might be able to do something hackish by using ManyCam which is a virtual webcam driver (from what I understand). This will provide a valid camera you can select from flash and you can also select a video file as the source file for ManyCam. See http://manycam.com/user_guide/#HowtoSelectaVideofileasthePictureSourceforManyCam
Update #2
If you're looking for something open source that will do the same thing as manycam, check out the following:
http://code.google.com/p/webcamstudio/wiki/VideoSourceMovie (GPL Licensed)