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  • IframeExtractor don't output sound with rtsp

    9 janvier 2013, par Kamax

    I use IframeExtractor from the git mooncatventure, it play nice the .mov file.
    But when i try to read a rtsp stream, i hear no sound.

    This is the FFMEG dump from the rtsp stream :

    Metadata:
    
title           : unknown
    
comment         : unknown
    
Duration: N/A, start: 49435.000589, bitrate: 258 kb/s
    
Program 3223 
    
No Program
    
Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    
Stream #0:1(fra): Audio: aac ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 142 kb/s
    
Stream #0:2(fra): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)
    
Stream #0:3(qad): Audio: aac ([15][0][0][0] / 0x000F), 48000 Hz, mono, fltp, 47 kb/s
    
Stream #0:4(qaa): Audio: aac ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 68 kb/s

    And this is the dump from the local .mov file that work :

    Metadata:
    
major_brand     : qt  
    
minor_version   : 0
    
compatible_brands: qt  
    
creation_time   : 2010-01-17 21:52:33
    
model           : iPhone 3GS
    
model-eng       : iPhone 3GS
    
date            : 2010-01-17T16:52:33-0500
    
date-eng        : 2010-01-17T16:52:33-0500
    
encoder         : 3.1.2
    
encoder-eng     : 3.1.2
    
make            : Apple
    
make-eng        : Apple
    
Duration: 00:00:03.25, start: 0.000000, bitrate: 3836 kb/s
    
Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x480, 3695 kb/s, 30.02 fps, 30 tbr, 600 tbn, 1200 tbc
    
Metadata:
    
  rotate          : 90
    
  creation_time   : 2010-01-17 21:52:33
    
  handler_name    : Core Media Data Handler
    
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s
    
Metadata:
    
  creation_time   : 2010-01-17 21:52:33
    
  handler_name    : Core Media Data Handler

    The audio class that manage sounds contain a codec detector which say that the codec CODEC_ID_AAC is found for the two input :

    audioStreamBasicDesc_.mFormatFlags = 0;
    
switch (_audioCodecContext->codec_id) {
    
    case CODEC_ID_MP3:
    
         audioStreamBasicDesc_.mFormatID = kAudioFormatMPEGLayer3;
    
        break;
    
    case CODEC_ID_AAC:
    
         audioStreamBasicDesc_.mFormatID = kAudioFormatMPEG4AAC;
    
         audioStreamBasicDesc_.mFormatFlags = kMPEG4Object_AAC_Main;
    
        NSLog(@"audio format aac %s (%d) is  supported",  _audioCodecContext->codec_name, _audioCodecContext->codec_id);
    
        break;
    
}

    I see data going into the buffer but i hear nothing. It's maybe audioStreamBasicDesc_ which has wrong settings but i can't find what.

    Is it possible that it's not the same AAC codec ?

    Has someone experienced the same issue ?

    Any help are welcome, i'm on this problem since some days now.

    Edit :
    I have found a error that i had not before, i don't know how to resolve it. If i change audioStreamBasicDesc.mFramesPerPacket to 0 or divided by 2, the error message dissapear.

    AudioConverterNew returned 'fmt?'
    
Prime failed ('fmt?'); will stop (72000/0 frames)

  • Compile ffmpeg with libfaac for armv7

    25 juillet 2013, par user2617213

    how can I compile ffmpeg with libfaac for armv7 ?
    I want to use libfaac.a for iPhone ,but how to compile ffmpeg with libfaac ?

  • Can FFMPEG library send the live H264 iOS Camera stream to Wowza using RTSP

    7 janvier 2015, par Vishal Lohia

    My requirement is to get iphone camera feed, encode it into H264 format and send it to server.
    In search, I found encoding part is possible with ffmpeg lib with x264 (libx264). But now the next task is to send the encoded data to Wowza server using rtsp.

    Please share some code or useful document if anyone is aware about this.

    There is one another library for encoding purpose live555. But I am not sure it can send the data to server using rtsp.

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