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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 ?

• ffmpeg with frei0r libraries fails on os x 10.14.6

  13 novembre 2019, par Bernhard Wagner

  I’m on Mac OS X 10.14.6 (Mojave), used homebrew to install both ffmpeg and frei0r.
  If you check the output below, the option --enable-frei0r is there.

  I verified the path to the frei0r libaries and call ffmpeg like this :

  FREI0R_PATH=/usr/local/Cellar/frei0r/1.6.1/lib/frei0r-1/ ffmpeg -v debug -i running.mkv -filter:v frei0r=pixeliz0r=0.02:0.02 pixel.mkv

  however it fails the exact same way as if I hadn’t passed the env var FREI0R_PATH :

  FREI0R_PATH=/usr/local/Cellar/frei0r/1.6.1/lib/frei0r-1/ ffmpeg -y -v debug -i running.mkv -filter:v frei0r=pixeliz0r=0.02:0.02 pixel.mkv
  
  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple clang version 11.0.0 (clang-1100.0.33.8)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.1_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include/darwin -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  
    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
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Splitting the commandline.
  
  Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
  
  Reading option '-v' ... matched as option 'v' (set logging level) with argument 'debug'.
  
  Reading option '-i' ... matched as input url with argument 'running.mkv'.
  
  Reading option '-filter:v' ... matched as option 'filter' (set stream filtergraph) with argument 'frei0r=pixeliz0r=0.02:0.02'.
  
  Reading option 'pixel.mkv' ... matched as output url.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option y (overwrite output files) with argument 1.
  
  Applying option v (set logging level) with argument debug.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input url running.mkv.
  
  Successfully parsed a group of options.
  
  Opening an input file: running.mkv.
  
  [NULL @ 0x7f894e002000] Opening 'running.mkv' for reading
  
  [file @ 0x7f894ce20f40] Setting default whitelist 'file,crypto'
  
  [matroska,webm @ 0x7f894e002000] Format matroska,webm probed with size=2048 and score=100
  
  st:0 removing common factor 1000000 from timebase
  
  st:1 removing common factor 1000000 from timebase
  
  [matroska,webm @ 0x7f894e002000] Before avformat_find_stream_info() pos: 1021 bytes read:32768 seeks:0 nb_streams:2
  
  [h264 @ 0x7f894e003400] nal_unit_type: 7(SPS), nal_ref_idc: 3
  
  [h264 @ 0x7f894e003400] nal_unit_type: 8(PPS), nal_ref_idc: 3
  
  [h264 @ 0x7f894e003400] nal_unit_type: 7(SPS), nal_ref_idc: 3
  
  [h264 @ 0x7f894e003400] nal_unit_type: 8(PPS), nal_ref_idc: 3
  
  [h264 @ 0x7f894e003400] nal_unit_type: 5(IDR), nal_ref_idc: 1
  
  [h264 @ 0x7f894e003400] Format yuv420p chosen by get_format().
  
  [h264 @ 0x7f894e003400] Reinit context to 1280x720, pix_fmt: yuv420p
  
  [h264 @ 0x7f894e003400] no picture
  
  [matroska,webm @ 0x7f894e002000] All info found
  
  [matroska,webm @ 0x7f894e002000] After avformat_find_stream_info() pos: 26157 bytes read:32768 seeks:0 frames:5
  
  Input #0, matroska,webm, from 'running.mkv':
  
    Metadata:
  
      MINOR_VERSION   : 0
  
      COMPATIBLE_BRANDS: iso6avc1mp41
  
      MAJOR_BRAND     : dash
  
      ENCODER         : Lavf58.29.100
  
    Duration: 00:00:46.22, start: -0.013000, bitrate: 2189 kb/s
  
      Stream #0:0, 3, 1/1000: Video: h264 (Main), 1 reference frame, yuv420p(tv, bt709, progressive, left), 1280x720 [SAR 1:1 DAR 16:9], 0/1, 60 fps, 60 tbr, 1k tbn, 120 tbc (default)
  
      Metadata:
  
        HANDLER_NAME    : ISO Media file produced by Google Inc.
  
        DURATION        : 00:00:46.216000000
  
      Stream #0:1(eng), 2, 1/1000: Audio: opus, 48000 Hz, stereo, fltp, delay 312 (default)
  
      Metadata:
  
        DURATION        : 00:00:46.194000000
  
  Successfully opened the file.
  
  Parsing a group of options: output url pixel.mkv.
  
  Applying option filter:v (set stream filtergraph) with argument frei0r=pixeliz0r=0.02:0.02.
  
  Successfully parsed a group of options.
  
  Opening an output file: pixel.mkv.
  
  [file @ 0x7f894ce22840] Setting default whitelist 'file,crypto'
  
  Successfully opened the file.
  
  detected 4 logical cores
  
  [h264 @ 0x7f894d006a00] nal_unit_type: 7(SPS), nal_ref_idc: 3
  
  [h264 @ 0x7f894d006a00] nal_unit_type: 8(PPS), nal_ref_idc: 3
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (opus (native) -> vorbis (libvorbis))
  
  Press [q] to stop, [?] for help
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
      Last message repeated 1 times
  
  [opus @ 0x7f894d020000] skip 312/960 samples
  
  [h264 @ 0x7f894d006a00] nal_unit_type: 5(IDR), nal_ref_idc: 1
  
  [h264 @ 0x7f894d006a00] Format yuv420p chosen by get_format().
  
  [h264 @ 0x7f894d006a00] Reinit context to 1280x720, pix_fmt: yuv420p
  
  [graph_1_in_0_1 @ 0x7f894ce3f740] Setting 'time_base' to value '1/48000'
  
  [graph_1_in_0_1 @ 0x7f894ce3f740] Setting 'sample_rate' to value '48000'
  
  [h264 @ 0x7f894d006a00] no picture
  
  [graph_1_in_0_1 @ 0x7f894ce3f740] Setting 'sample_fmt' to value 'fltp'
  
  [graph_1_in_0_1 @ 0x7f894ce3f740] Setting 'channel_layout' to value '0x3'
  
  [graph_1_in_0_1 @ 0x7f894ce3f740] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x3
  
  [format_out_0_1 @ 0x7f894ce3fdc0] Setting 'sample_fmts' to value 'fltp'
  
  [AVFilterGraph @ 0x7f894cc07180] query_formats: 4 queried, 9 merged, 0 already done, 0 delayed
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
      Last message repeated 2 times
  
  [h264 @ 0x7f894d007000] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
  [h264 @ 0x7f894e030800] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
  [h264 @ 0x7f894e030e00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
      Last message repeated 1 times
  
  [h264 @ 0x7f894e017c00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
  [h264 @ 0x7f894d006a00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  [Parsed_frei0r_0 @ 0x7f894ce4fe40] Setting 'pixeliz0r' to value '0.02'
  
  [Parsed_frei0r_0 @ 0x7f894ce4fe40] Option 'pixeliz0r' not found
  
  [AVFilterGraph @ 0x7f894cc08340] Error initializing filter 'frei0r' with args 'pixeliz0r=0.02:0.02'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Option not found
  
  Error while processing the decoded data for stream #0:0
  
  [AVIOContext @ 0x7f894cc06400] Statistics: 0 seeks, 0 writeouts
  
  [libvorbis @ 0x7f894d800c00] 44 frames left in the queue on closing
  
  [AVIOContext @ 0x7f894ce21080] Statistics: 65536 bytes read, 0 seeks
  
  Conversion failed!

• 'ffmpy' cannot find 'ffmpeg' when running in PyCharm on Mac using conda env

  5 janvier 2020, par user12448123

  When I ran the following piece of code in PyCharm on MacOS Catalina within conda environment :

  import ffmpy
  
  
  
  ff = ffmpy.FFmpeg(
  
       inputs={'download/v_5c80f6ac3e28a_7BumyNgu/video.m3u8': ['-protocol_whitelist', 'crypto,file,http,https,tcp,tls']},
  
       outputs={'download/ffmpy_test.mp4': None}
  
  )
  
  print(ff.cmd)
  
  ff.run()

  I got this error :

  Traceback (most recent call last):
  
    File "/Users/myname/.conda/envs/xiaoetong/lib/python3.7/site-packages/ffmpy.py", line 95, in run
  
      stderr=stderr
  
    File "/Users/myname/.conda/envs/xiaoetong/lib/python3.7/subprocess.py", line 800, in __init__
  
      restore_signals, start_new_session)
  
    File "/Users/myname/.conda/envs/xiaoetong/lib/python3.7/subprocess.py", line 1551, in _execute_child
  
      raise child_exception_type(errno_num, err_msg, err_filename)
  
  FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg': 'ffmpeg'
  
  
  
  
  
  During handling of the above exception, another exception occurred:
  
  
  
  Traceback (most recent call last):
  
    File "/Users/myname/Documents/Projects/xiaoetong/ffmpy_test.py", line 8, in <module>
  
      ff.run()
  
    File "/Users/myname/.conda/envs/xiaoetong/lib/python3.7/site-packages/ffmpy.py", line 99, in run
  
      raise FFExecutableNotFoundError("Executable '{0}' not found".format(self.executable))
  
  ffmpy.FFExecutableNotFoundError: Executable 'ffmpeg' not found
  
  
  
  Process finished with exit code 1
  
  </module>

  The traceback info above literally implies that either ffmpeg is not installed or command is not added to path. However, I did install it, and I could call ffmpeg command successfully in terminal. I could even run that python script without error in zsh terminal within exactly the same conda environment (and using exactly the same python interpreter).

  (Some information that might be useful :

  1. The same code could also be run without error within the same conda environment in PyCharm on Windows 10.

  2. python==3.7.5, ffmpeg==4.2, ffmpy==0.2.2 )

  This error is just so weird that I have no clue. Someone please help, I would appreciate.