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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.

• If you rotate the iPhone's video with ffmpeg, the rotation information sticks. Can I hide this ?

  24 août 2017, par howmanylife

  The following implementation is a command to rotate the movie by 90 degrees.

  ffmpeg -i video.mp4 -vf transpose=1 -metadata:s:v:0 rotate=0 videoo.mp4
  
  -vf transpose=1

  The iPhone’s video contains rotation information and actually

  ffprobe -show_streams -print_format json videoo.mp4 2>/dev/null

  To output motion picture information or rotation information as described below.

   "tags": {
  
                  "rotate": "90",
  
                  "creation_time": "2017-08-24T01:49:38.000000Z",
  
                  "language": "und",
  
                  "handler_name": "Core Media Data Handler",
  
                  "encoder": "'avc1'"
  
              },
  
              "side_data_list": [
  
                  {
  
                      "side_data_type": "Display Matrix",
  
                      "displaymatrix": "\n00000000:            0       65536           0\n00000001:       -65536           0           0\n00000002:            0           0  1073741824\n",
  
                      "rotation": -90
  
                  }
  
              ]
  
  
  
  
  
  
  
  "rotate": "90",

  and

  "side_data_list":

  and

  "rotation": -90

  Is it possible to hide this ? Or is it possible to erase only this rotation information ?

• ffmpeg rtmp webcam live stream iphone/pad segment size too big

  1er février 2013, par Foo Barazz

  I'm transcoding a rtmp stream from a red5 server for use to live stream on a iphone or ipad device. I built latest ffmpeg version from git repo using the built in segmenter to create .ts files and m3u8 playlist file using the following :

  ffmpeg -probesize 50k -i "rtmp://localhost/oflaDemo/red5StreamDemo live=1" \
  
  -c:v libx264 -b:v 128k -vpre ipod320 -flags -global_header -map 0 \
  
  -f segment -segment_time 3 -segment_list foo.m3u8 -segment_list_flags +live \
  
  -segment_list_type m3u8 -segment_list_size 5 -segment_format mpegts foo%d.ts

  This works fine, but I can't get the segment size smaller than about 12 sec even set to 3 (-segment_time 3). It seems to be caused by libx264 vcodec.
  Am I missing any flag ?

  By the way, you can simple run the ffmpeg command above successfully by starting red5 SimpleBroadcaster example.