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• Webcam stream with FFMpeg on iPhone

  6 décembre 2011, par Saphrosit

  I'm trying to send and show a webcam stream from a linux server to an iPhone app. I don't know if it's the best solution, but I downloaded and installed FFMpeg on the linux server (following, for those who want to know, this tutorial).
  FFMpeg is working fine. After a lots of wandering, I managed to send a stream to the client launching

  ffmpeg  -s 320x240 -f video4linux2 -i /dev/video0 -f mpegts -vcodec libx264 udp://192.168.1.34:1234

  where 192.168.1.34 is the address of the client. Actually the client is a Mac, but it is supposed to be an iPhone. I know the stream is sent and received correctly (tested in different ways).
  However I didn't managed to watch the stream directly on the iPhone.
  I thought of different (possible) solutions :

  • first solution : store incoming data in a NSMutableData object. Then, when the stream ends, store it and then play it using a MPMoviePlayerController. Here's the code :

    [video writeToFile:@"videoStream.m4v" atomically:YES];
    
    NSURL *url = [NSURL fileURLWithPath:@"videoStream.m4v"];
    
    
    
    MPMoviePlayerController *videoController = [[MPMoviePlayerController alloc] initWithContentURL:url];
    
    
    
    [videoController.view setFrame:CGRectMake(100, 100, 150, 150)];
    
    
    
    [self.view addSubview:videoController.view];
    
    
    
    [videoController play];

    the problem of this solution is that nothing is played (I only see a black square), even if the video is saved correctly (I can play it directly from my disk using VLC). Besides, it's not such a great idea. It's just to make things work.

  • Second solution : use CMSampleBufferRef to store the incoming video. Much more problems comes with this solution : first of all, there's no CoreMedia.framework in my system. Besides I do not get well what does this class represents and what should I do to make it works : I mean if I start (somehow) filling this "SampleBuffer" with bytes I receive from UDP connection, then it will automatically call the CMSampleBufferMakeDataReadyCallback function I set during creation ? If yes, when ? When the single frame is completed or when the whole stream is received ?

  • Third solution : use AVFoundation framework (neither this is actually available on my Mac). I did not understand if it's actually possible to start recording from a remote source or even from a NSMutableData, a char* or something like that. On AVFoundation Programming Guide I didn't find any reference that say if it's possible or not.

  I don't know which one of this solution is the best for my purpose. ANY suggestion would be appreciate.

  Besides, there's also another problem : I didn't use any segmenter program to send the video. Now, if I'm not getting wrong, segmenter needs to split the source video in smaller/shorter video easier to send. If it is right, then maybe it's not strictly necessary to make things work (may be added later). However, since the server is running under linux, I cannot use Apple's mediastreamsegmeter. May someone suggest an opensource segmenter to use in association with FFMpeg ?

  ---

  UPDATE : I edited my question adding more informations on what I did since now and what my doubts are.

• ffmpeg2theora oggfwd not working with icecast2

  6 décembre 2011, par achilles

  I have a camera streaming (mjpeg) in http://192.168.x.x/image (where x are the rest of the IP). I start my icecast2 server (Ubuntu 10.10) and then I stream using :

  ffmpeg2theora -f mjpeg http://192.168.x.x/image -o /dev/stdout - | oggfwd localhost 8000 password /test

  The mountpoint is created but the video is not showing on Firefox. I do see the video box but it's just infinitely showing the "thinking" icon and video does not show.

  If I download a proper ogg file and do

  cat proper_ogg_file.ogg | oggfwd localhost 8000 password /test

  I see the video on the icecast server's website.

  In addition I did :

  ffmpeg2theora -f mjpeg http://192.168.x.x/image -o test_video.ogg

  Once I stop the process (CTRL+C) and go to my Desktop where the video is saved and open it with VLC or any other media player, it plays the portion of the stream that I allowed to be recorded all the way up to pressing CTRL+C.

  If I take that file and use the previous method :

  cat test_video.ogg | oggfwd localhost 8000 password /test

  I get the same issue as when I was directly piping the camera to stdout and then to oggfwd. So therefore I assume this is a "conversion" to ogg issue ? Can anybody help ? Any idea why i can't do that ?

• Use sox to combine audios

  7 septembre 2012, par user1622115

  I have three 3gp file,and I use sox to combine them

  sox --combine sequence C:\1.3gp C:\2.3gp C:\3.3gp C:\newaudio.3gp

  but It's show that "FAIL formats:no handler for file extension 3gp"

  Its means that I have to install some extension ?

  I'm trying to do it with sox,Can anybody give me any suggestions ?

  Or It's possible do it with ffmpeg ?