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• Recording MP3 file from iphone using FFMPEG

  16 octobre 2014, par harit shah

  I am trying to record an mp3 file from iphone. It seems it is not possible so next option I am trying is recording it with aac encoding and convert it with ffmpeg exe to mp3.

  I am recording the m4a file with following code :

  // Set the audio file
  
  NSArray *pathComponents = [NSArray arrayWithObjects:
  
                             [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],
  
                             @"MyAudioMemo.aac",
  
                             nil];
  
  NSURL *outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];
  
  
  
  // Setup audio session
  
  AVAudioSession *session = [AVAudioSession sharedInstance];
  
  [session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
  
  UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
  
  AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride);
  
  
  
  NSMutableDictionary *recordSettings = [[NSMutableDictionary alloc] initWithCapacity:10];
  
  NSNumber *formatObject;
  
  formatObject = [NSNumber numberWithInt: kAudioFormatMPEG4AAC];
  
  
  
  [recordSettings setObject:formatObject forKey: AVFormatIDKey];
  
  [recordSettings setObject:[NSNumber numberWithFloat:44100.0] forKey: AVSampleRateKey];
  
  [recordSettings setObject:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];
  
  // [recordSettings setObject:[NSNumber numberWithInt:12800] forKey:AVEncoderBitRateKey];
  
  // [recordSettings setObject:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
  
  [recordSettings setObject:[NSNumber numberWithInt: AVAudioQualityHigh] forKey: AVEncoderAudioQualityKey];

  so when I try to convert it using ffmpeg -i 1.m4a 1.mp3 it says invalid input found while reading 1.m4a. I tried different encoding but everytime I get the same error. Any help on this would be life saving.

  Thanks.

• IP cameras and Nginx

  28 octobre 2015, par JocBro1

  The goal is to connect a large number of IP cameras to a server Nginx archiving all going stream video files to mp4 (H264 + ACC) to play them on different devices.

  Module was installed nginx-rtmp-module (for HLS and RTMP).

  avconv takes a stream from the cameras at rtsp and gives to nginx’s rtmp.

  Recording is as nginx to flv and then the files in the desired format convert to mp4. (Here is a question for information about the file is video-codec : h264, audio-codec : acc, but if you save them to mp4, iDevises not be played on, we have yet to convert. Why ?)

  The problem in general is that after a certain time (say 20-30 minutes) nginx more than half of the cameras stops processing, play video and record video files from the camera, if you look at this live stream with rtmp - he does not play, but hls - played.

  Sorry for translater’s english)

  People help me, please !

• arm : vp9itxfm : Reorder iadst16 coeffs

  31 décembre 2016, par Martin Storsjö

  arm : vp9itxfm : Reorder iadst16 coeffs
  This matches the order they are in the 16 bpp version.
  There they are in this order, to make sure we access them in the
  
  same order they are declared, easing loading only half of the
  
  coefficients at a time.
  This makes the 8 bpp version match the 16 bpp version better.
  This is cherrypicked from libav commit
  
  08074c092d8c97d71c5986e5325e97ffc956119d.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/arm/vp9itxfm_neon.S