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• FFmpeg 'setpts=PTS-STARTPTS' cannot work on Android(ARM)

  12 octobre 2017, par Jerikc XIONG

  I use the following command on Android :

  ffmpeg -loglevel 56 -i test.mp4 -vf [0:v]setpts=PTS-STARTPTS[fg] -c:a copy out.mp4 -y

  But it’s failed and I got the following logs :

  N:0 PTS:0 T:0.000000 POS:3848 INTERLACED:0 -> PTS:0 T:nan

  So i add some logs into static int filter_frame(AVFilterLink *inlink, AVFrame *frame) in the libavfilter/setpts.c :

  av_log(inlink->dst, AV_LOG_TRACE, " -> PTS%"PRId64", d:%s timebase:%f, AV_NOPTS_VALUE:%"PRId64 ", AV_NOPTS_VALUE==0?%d:, d == AV_NOPTS_VALUE?%d, TS2T:%f, :%f\n", frame->pts, d2istr(d), av_q2d(inlink->time_base), AV_NOPTS_VALUE, val == 0, d == AV_NOPTS_VALUE, d*av_q2d(inlink->time_base), (double)(0)*0.000078);

  I got the logs :

  -> PTS0, d:0 timebase:0.000011, AV_NOPTS_VALUE:-9223372036854775808, AV_NOPTS_VALUE==0?0:, d == AV_NOPTS_VALUE?0, TS2T:nan, :0.000000

  It’s weird. I always get nan by the TS2T.

  It’s OK on MacBook Pro (Retina, 13-inch, Early 2015) with 2.7 GHz Intel Core i5 when i build the same source code.

  PS :

  #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb))

  I added the full log here.

• How can I fix choppy ffmpeg RTP streaming over wifi ?

  19 décembre 2015, par awidgery

  I have a Raspberry Pi, with a USB mic and a WiFi dongle dongle connected.

  I’m trying to stream audio only from the Pi, with the intention of receiving the stream over wifi to a custom iOS mobile app using VLCKit. I’m using ffmpeg on the Pi as I need a reasonably low (<2s) latency for this project, and using Icecast/Darkice gave around 15s latency.

  The code executed on the Pi is :

  ffmpeg -f alsa -i plughw:1,0 -acodec libmp3lame -ab 128k -ac 1 -ar 44100  -f rtp rtp://234.5.5.5:1234

  On the Pi end I have a device playing (Christmas !) music constantly into the USB mic for testing purposes. The Pi is only connected by WiFi - not ethernet.

  For testing receiving the stream, I’m using VLC (on a Macbook/iPhone).

  When the Mac is connected through Ethernet, the stream works fine, as you can see here :

  https://goo.gl/photos/HZgNh7z4HgaqHBaP7

  However, when the Mac is connected via WiFi, the stream is choppy, as you can see here :

  https://goo.gl/photos/qjAVH6djqS9Jbvmh6

  You can also see a ping trace from the Mac to the Pi, and the VLC stats. As you can see there doesn’t seem to be a correlation between either of these and the choppiness.

  I’ve tried the VLC iOS app and the choppiness is the same as the Mac on WiFi.

  How can I decrease/remove this chop, even if doing so increases latency a bit ?

• How to use NSProcessInfo's operatingSystemVersion property in place of gestaltSystemVersionMinor and gestaltSystemVersionBugFix

  28 octobre 2016, par Michael Whiteacre

  Newbie here, but longtime frequenter of this essential resource.

  Using :
  MacBook Pro (Retina, 13-inch, Early 2015).
  Processor : 3.1 GHz Intel Core i7
  Memory : 16 GB 1867 MHz DDR3
  Running Yosemite 10.10.5

  I’m attempting to compile my own Perian- and FFmpeg-based FFusion.component (for Quicktime), for 10.11 using Xcode 7.2.1, and in this relatively simple project, as in others, am trying to move away from Gestalt. The original FFusion-RJVB.xcodeproj I’m employing is Xcode-3.2 compatible.

  I have yet to find a clear, definitive solution to what must appear a painfully simple problem to you all. Here is the Gestalt version :
  `

  #if TARGET_OS_MAC
  
  static int GetSystemMinorVersion()
  
  {
  
      static SInt32 minorVersion = -1;
  
      if (minorVersion == -1)
  
          Gestalt(gestaltSystemVersionMinor, &minorVersion);
  
  
  
      return minorVersion;
  
  }
  
  
  
  static int GetSystemMicroVersion()
  
  {
  
      static SInt32 microVersion = -1;
  
      if (microVersion == -1)
  
          Gestalt(gestaltSystemVersionBugFix, &microVersion);
  
  
  
      return microVersion;
  
  }
  
  #endif

  `
  I’ve tried what seems like endless variations of NSProcessInfo i.e.

  ([[NSProcessInfo processInfo] respondsToSelector:@selector(operatingSystemVersion)])

  but I’m afraid I’m not formatting it correctly to achieve my ends. It just hasn’t ’clicked’ in my head yet, so Im hoping someone can give me a push when I see the difference between the gestalt version, my stumbling attempts, and the correct way.

  Many thanks.