Sur d’autres sites (7170)

• CMTimeGetSeconds doesn't get the right video duration

  26 février 2015, par JLCastillo

  some users don’t get the right duration of videos they capture with their own device. The funny thing is others do actually see it right, using the same device models and OS version. Anyway, we observed it in a iPhone 5c 7.1.2 and an iPhone 5s 8.1.3.

  This code works for most users, but not all :

  ALAssetRepresentation *representation = [mediaObject.asset defaultRepresentation];
  
  NSURL *url = [representation url];
  
  NSDictionary *options = @{ AVURLAssetPreferPreciseDurationAndTimingKey : @YES };
  
  AVAsset *avAsset = [AVURLAsset URLAssetWithURL:url options:options];
  
  videoDurationTime = CMTimeGetSeconds(avAsset.duration);

  I asked them to send the input videos, and this is the output from "ffmpeg -i"

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bug_duration1.MOV':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 0
  
      compatible_brands: qt
  
      creation_time   : 2015-02-23 08:30:01
  
      encoder         : 8.1.3
  
      encoder-eng     : 8.1.3
  
      date            : 2015-02-23T16:30:01+0800
  
      date-eng        : 2015-02-23T16:30:01+0800
  
      model           : iPhone 5s
  
      model-eng       : iPhone 5s
  
      make            : Apple
  
      make-eng        : Apple
  
    Duration: 00:00:03.67, start: 0.000000, bitrate: 16793 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 16719 kb/s, 29.99 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-02-23 08:30:01
  
        handler_name    : Core Media Data Handler
  
        encoder         : H.264
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 61 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-02-23 08:30:01
  
        handler_name    : Core Media Data Handler

  The video is detected with a duration of several minutes. Did anybody face this problem before ?

  Thanks in advance.

• ffmpeg udp live stream publish to rtmp

  2 juin 2016, par Pilskalns

  I need to make this chain :
  JVC HM650—UDP—>localhost—>ffmpeg(copy stream)—>nginx-rtmp

  On input I have UDP stream from camera (udp ://@:35501) and I need it to publish to rtmp server (nginx with rtmp module). Apart everything works - I can play input on VLC, I can stream from FMLE to nginx etc. Except, this is my first time with ffmpeg and I can’t get it work. So :

  This is best i have got :

  C:\ffmpeg\bin>ffmpeg -re -i udp://@:35501 -f flv "rtmp://192.168.1.17/live/live" -loglevel debug
  
  ffmpeg version N-69972-g6c91afe Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnu
  
  tls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-
  
  libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-l
  
  ibrtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --
  
  enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --ena
  
  ble-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      54. 19.100 / 54. 19.100
  
    libavcodec     56. 25.100 / 56. 25.100
  
    libavformat    56. 23.100 / 56. 23.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.100 /  5. 11.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Splitting the commandline.
  
  Reading option '-re' ... matched as option 're' (read input at native frame rate) with argument '1'.
  
  Reading option '-i' ... matched as input file with argument 'udp://@:35501'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'flv'.
  
  Reading option 'rtmp://192.168.1.17/live/live' ... matched as output file.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option loglevel (set logging level) with argument debug.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file udp://@:35501.
  
  Applying option re (read input at native frame rate) with argument 1.
  
  Successfully parsed a group of options.
  
  Opening an input file: udp://@:35501.
  
  [udp @ 0000000002c30760] end receive buffer size reported is 65536
  
  [AVIOContext @ 0000000002c513c0] Statistics: 0 bytes read, 0 seeks
  
  udp://@:35501: Immediate exit requested
  
  Received signal 2: terminating.
  
  
  
  C:\ffmpeg\bin>

  What is wrong with ffmpeg configuration ?

  SOLUTION :

  The ffmpeg was listening on wrong version of UDP protocol :

  Even IPv6 is disabled on network cards, internally in system, using @ allowed ffmpeg listen at UDPv6.

  By using 127.0.0.1 tells ffmpeg to use clean UDP.

  Thanks, @thomas to make me think differently !

• Want to use ffmpeg build library files in WIndows phone 8.1

  7 juillet 2016, par bharat aghera

  I have created the build of FFMpeg library for windows phone 8.1 simulator using the given steps from .
  It has created three folders such as bin, include and lib. "bin" contains the .dll and .lib file. "include" contains the header files. "lib" contains the .def file.

  Now I want to use this library file in windows phone 8.1 application. But I didn’t get how can I use it using visual studio 2015 in my project ?

  I have checked out the FFMpegIntrop project. But I want to call the single function of the ffmpeg library avcodec_register_all(),avcodec_find_decoder(CODEC_ID_H264) .