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• “Hook” libMMS to FFmpeg for iPhone Streaming

  8 novembre 2011, par Xie Xingwei

  These days, I was researching the software architechture for iPhone Streaming (Base on MMS protocol).

  As we know, in order to playback MMS audio stream, we should call libMMS to read wma stream data from remote media server, and then call FFmpeg to decode the stream data from wma format into PCM data buffer, and finally, enqueue the PCM data buffer into iPhone’s audioqueue to generate real sound.

  The introduction above just describe the working process of iPhone streaming. If we only need to implement this simple functionality, that is not difficult. Just follow the introduction above to call libMMS, FFMpeg and audioqueue step by step, we can achieve the streaming function. Actually, I have implemented the code last week.

  But, what I need is not only a simple streaming function ! I need a software architechture makes FFmpeg accessing libMMS just like accessing local filesystem !

  Does anybody know how to hook the libMMS interfaces like mms_read/mms_seek onto FFmpeg filesystem interfaces like av_read_frame/av_seek_frame ?

• iPhone video conversion to Android supported format using FFMPEG

  21 janvier 2016, par Muhammad Umar

  I have an iPhone video created as follow

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid.mp4':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2016-01-20 09:21:08
  
      make            : Apple
  
      make-eng        : Apple
  
      encoder         : 8.2
  
      encoder-eng     : 8.2
  
      date            : 2016-01-20T14:20:57+0500
  
      date-eng        : 2016-01-20T14:20:57+0500
  
      model           : iPhone 5
  
      model-eng       : iPhone 5
  
    Duration: 00:00:10.80, start: 0.000000, bitrate: 765 kb/s
  
      Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 62 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-01-20 09:21:08
  
        handler_name    : Core Media Data Handler
  
      Stream #0:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 320x320, 696 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-01-20 09:21:08
  
        handler_name    : Core Media Data Handler
  
        encoder         : H.264

  I want to convert it into Android support format so that all iPhone and maximum androids can read it.

  However if i convert to mpeg4 format using

  ffmpeg -i vid.mp4 -s 320x320 -vcodec mpeg4 -acodec aac -strict -2 -ac 2 -ar 44100 -ab 128k output.mp4

  it really degrades the quality

  How can i set the ffmpeg to create atleast as close as possible quality which runs on both android and iPhone

• How to play FLV file programmatically on iPhone ?

  8 décembre 2017, par HAPPY_TIGER

  I am going to play flv file on iPhone with ffmpeg library.

  The codec of the file is H.264 and video codec is AVC HL.

  Perhaps other ideas without ffmpeg are OK.