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• Piping stream to ffmpeg via forked process stdin

  6 novembre 2019, par Yanick Salzmann

  I am piping data from my raspberry pi camera to ffmpeg to convert them into an mp4 stream. I do so not with libavformat/libavformat but I call ffmpeg directly like this :

          context->ffmpeg_process = utils::launch_subprocess(
  
                  "ffmpeg",
  
                  {"-f", "rawvideo", "-pix_fmt", "yuv420p", "-s", "1920x1080", "-r", "30", "-i", "-", "-c", "libx264", "-f", "mp4", "-movflags", "frag_keyframe+empty_moov", "-", "-loglevel", "trace"}
  
          );

  This is my wrapper around fork and exec like this :

          const auto child = fork();
  
          if(child == 0) {
  
              if (dup2(stdin_pipe[PIPE_READ], STDIN_FILENO) == -1) {
  
                  exit(errno);
  
              }
  
  
  
              // same for stdout and sterr
  
  
  
              execvp(command.c_str(), proc_args);
  
              exit(errno);
  
          } else if(child > 0) {
  
              // same for stdout and stderr
  
              ret_process.stdin_pipe = stdin_pipe[PIPE_WRITE];
  
          }

  Now I have a callback that is called by the raspberry pi camera :

      void CameraHandler::handle_camera_frame(const std::vector &data, std::size_t size) {
  
          FILE* f = fopen("output.yuv4", "ab");
  
          fwrite(data.data(), 1, size, f);
  
          fclose(f);
  
  
  
          std::lock_guard l{_listener_lock};
  
          for (const auto &listener : _data_listeners) {
  
              std::size_t written = 0;
  
              while (written < size) {
  
                  const auto num_written = write(listener->ffmpeg_process.stdin_pipe, data.data() + written, size - written);
  
                  written += num_written;
  
                  if(num_written < 0) {
  
                      log->error("Broken stdin pipe");
  
                      break;
  
                  }
  
              }
  
          }
  
      }

  I deliberately append every frame to a file because I am running the exact same command as above (with cat output.yuv4 | ffmpeg ... > output4.mp4 to cross check).

  Now I can see that I am reading some data from my camera and pushing it to the ffmpeg process. But already after the first read ffmpeg complains, that the input data is invalid :

  [2019-11-06 20:08:04.010] [11872:11932] [carpi::data::CameraHandler] [info] Launched ffmpeg process. PID: 11933, error: 0
  
  [2019-11-06 20:08:04.014] [11872:11932] [carpi::video::RawCameraStream] [info] Camera dimension: 1920/1080
  
  ffmpeg version 4.1.4-1+rpt1~deb10u1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  
    configuration: --prefix=/usr --extra-version='1+rpt1~deb10u1' --toolchain=hardened --libdir=/usr/lib/arm-linux-gnueabihf --incdir=/usr/include/arm-linux-gnueabihf --arch=arm --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input url -.
  
  Applying option pix_fmt (set pixel format) with argument yuv420p.
  
  Applying option s (set frame size (WxH or abbreviation)) with argument 1920x1080.
  
  Applying option r (set frame rate (Hz value, fraction or abbreviation)) with argument 30.
  
  Successfully parsed a group of options.
  
  Opening an input file: -.
  
  [NULL @ 0xcd02d0] Opening 'pipe:' for reading
  
  [pipe @ 0xcd0b50] Setting default whitelist 'crypto'
  
  [AVIOContext @ 0xcd8d50] Statistics: 1048576 bytes read, 0 seeks
  
  pipe:: Invalid data found when processing input

  I am now confused. This is literally the same as I am fwriteing and then piping from the file. Is there something wrong with my write ?

• More problems with FFmpeg not recognizing the directory I'm sending it to

  8 novembre 2019, par Requiem_7

  I am creating a program that takes an audio file, breaks it up into 30-second audio files, and sends those files to Google’s Speech Recognition API to transcribe the audio. I’m using FFmpeg to break up the original audio file and make the 30-second files. It was working for about 20 minutes and I didn’t change anything but now it’s giving me an error saying that no such file or directory exists.

  Here is the error it gives me :

  C:\Users\hmkur\Desktop\Python\Transcribing_Audio_GoogleAPI_Python>ffmpeg -i source/valve.flac -f segment -segment_time 30 -c copy parts/out%01d.flac
  
  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.1.1 (GCC) 20190807
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'source/valve.flac':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:11:42.54, start: 0.000000, bitrate: 129 kb/s
  
      Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : ISO Media file produced by Google Inc.
  
  [segment @ 000001f8e84bd100] Opening 'parts/out0.flac' for writing
  
  [segment @ 000001f8e84bd100] Failed to open segment 'parts/out0.flac'
  
  Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
      Last message repeated 1 times

  Both the folder "source" with "valve.flac" exists as well as the folder "parts" and the files "out0.flac", etc. I was originally trying in the wav file format, switched to flac and it worked for about 20 minutes then stopped working.

• I have installed FFMPEG and can't find it inside a PHP script

  14 novembre 2019, par Antop

  I have installed FFMPeg in CentOS. It works perfectly.
  It’s inside /usr/bin directory. Also, I have PHP 7.2.24 that comes with Plesk 18.0.20.

  I want to use FFMPeg inside a PHP script, but that script can’t find the executable of FFMpeg. I have tried giving the exact route (/usr/bin/ffmpeg) but doesn’t work.

  It’s a production server. The same script, in my development server (macOS) works perfectly.

  I tried using :

  var_dump(getenv('PATH'));
  
  var_dump(exec('which ffmpeg'));
  
  var_dump(ini_get('open_basedir'));
  
  var_dump(is_file(exec('which ffmpeg')));
  
  var_dump(is_executable(exec('which ffmpeg')));

  And it returns me :

  string(49) "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin"
  
  string(0) ""
  
  string(44) "/var/www/vhosts/name-of-the-domain.com/:/tmp/"
  
  bool(false)
  
  bool(false)
  
  NULL

  ¿What could be happening ?

  A very strange thing I’ve noticed is that I can’t access any command via php :
  I tried using it with echo

  var_dump(exec('which echo'));
  
  var_dump(is_file(exec('which echo')));
  
  var_dump(is_executable(exec('which echo')));

  And it returns me :

  string(0) ""
  
  bool(false)
  
  bool(false)
  
  NULL

  And the permissions are right :

  [root@vps bin]# ls -lha echo
  
  -rwxr-xr-x 1 root root 33K ago 20 08:25 echo
  
  
  
  [root@vps bin]# ls -lha ffmpeg
  
  -rwxr-xr-x 1 root root 217K abr  4  2019 ffmpeg

  But if I make a

  var_dump(exec('echo "HELLO"'))

  it returns me

  string(5) "HELLO"