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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 ?

• How to make my video in landscape mode using ffmpeg

  6 novembre 2019, par Aarwil

  I have four video chats. Somehow I have managed to cut videos into pieces, stored in array then stacked and finally concat the video which is in the youtube link down below. I have used the size in the portrait view is 640*480. But I need to show them in the landscape. Suggest me any ideas.

  Landscape view :
  https://youtu.be/u8tmL2-CdK0
  Portrait view :
  https://youtu.be/lO-Q3I9X8OA

  These are my inputs

  Input #0, matroska,webm, from 'PA473fbf06ed1f952f95c88b9cf22ed0ba_pre.mkv':
 Metadata:
   encoder         : GStreamer matroskamux version 1.8.1.1
   creation_time   : 2019-11-05T06:08:19.000000Z
 Duration: 00:01:05.50, start: 63.041000, bitrate: 30 kb/s
   Stream #0:0(eng): Video: h264 (Baseline), yuvj420p(pc, progressive), 360x480, SAR 1:1 DAR 3:4, 15 tbr, 1k tbn, 2k tbc (default)
   Metadata:
     title           : Video
Input #1, matroska,webm, from 'PA183db0ed986039de3197092103a411eb_pre.mkv':
 Metadata:
   encoder         : GStreamer matroskamux version 1.8.1.1
   creation_time   : 2019-11-05T06:07:20.000000Z
 Duration: 00:03:15.14, start: 4.062000, bitrate: 172 kb/s
   Stream #1:0(eng): Video: h264 (Baseline), yuvj420p(pc, progressive), 360x480, SAR 1:1 DAR 3:4, 15 fps, 15 tbr, 1k tbn, 2k tbc (default)
   Metadata:
     title           : Video
Input #2, matroska,webm, from 'PA62a810038cbcc00be21fac43e98f5ee1_pre.mkv':
 Metadata:
   encoder         : GStreamer matroskamux version 1.8.1.1
   creation_time   : 2019-11-05T06:07:45.000000Z
 Duration: 00:02:21.71, start: 28.803000, bitrate: 92 kb/s
   Stream #2:0(eng): Video: h264 (Baseline), yuvj420p(pc, progressive), 360x480, SAR 1:1 DAR 3:4, 15 tbr, 1k tbn, 2k tbc (default)
   Metadata:
     title           : Video
Input #3, matroska,webm, from 'PA8fa44ff1ba37ee510a045198bca6f04a_pre.mkv':
 Metadata:
   encoder         : GStreamer matroskamux version 1.8.1.1
   creation_time   : 2019-11-05T06:07:48.000000Z
 Duration: 00:01:50.69, start: 32.318000, bitrate: 28 kb/s
   Stream #3:0(eng): Video: h264 (Baseline), yuvj420p(pc, progressive), 360x480, SAR 1:1 DAR 3:4, 15 fps, 15 tbr, 1k tbn, 2k tbc (default)
   Metadata:
     title           : Video

  At first, I change all the video resolution to 640:480 because each video may have different resolution (probability). So I am setting a fixed resolution.

  ffmpeg -i PA8fa44ff1ba37ee510a045198bca6f04a_pre.mkv -vf scale=640:480 PA8fa44ff1ba37ee510a045198bca6f04a.mkv -hide_banner
Input #0, matroska,webm, from PA8fa44ff1ba37ee510a045198bca6f04a_pre.mkv':
 Metadata:
   encoder         : GStreamer matroskamux version 1.8.1.1
   creation_time   : 2019-11-05T06:07:48.000000Z
 Duration: 00:01:50.69, start: 32.318000, bitrate: 28 kb/s
   Stream #0:0(eng): Video: h264 (Baseline), yuvj420p(pc, progressive), 360x480, SAR 1:1 DAR 3:4, 15 fps, 15 tbr, 1k tbn, 2k tbc (default)
   Metadata:
     title           : Video
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[swscaler @ 0000021d72eb3f80] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0000021d72b33b40] using SAR=9/16
[libx264 @ 0000021d72b33b40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0000021d72b33b40] profile High, level 2.2, 4:2:0, 8-bit
[libx264 @ 0000021d72b33b40] 264 - core 158 r2984 3759fcb - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=15 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, matroska, to 'PA8fa44ff1ba37ee510a045198bca6f04a.mkv':
 Metadata:
   encoder         : Lavf58.32.104
   Stream #0:0(eng): Video: h264 (libx264) (H264 / 0x34363248), yuvj420p(pc), 640x480 [SAR 9:16 DAR 3:4], q=-1--1, 15 fps, 1k tbn, 15 tbc (default)
   Metadata:
     title           : Video
     encoder         : Lavc58.56.101 libx264

  Two videos merging command

  ffmpeg
-i ddb97d85-fc21-4fb4-8062-ca2084a48aeb.mkv
-i a8665a5f-fb5e-44cb-a072-070fbe07a14f.mkv
-filter_complex "[0:v][1:v]hstack" 1572934056.mkv

  Three videos merging command

  ffmpeg
-i 16f90447-c8b6-4077-b3b6-4fb2c07e19b5.mkv
-i ef501109-0ee9-4924-8de1-65eb796a4a78.mkv
-i 0b284aa6-4175-472c-aaf6-837412f97f32.mkv
-filter_complex "[1:v]scale=320:-1[left]; [2:v]scale=320:-1[right]; [left][right]hstack[bottom]; [0:v][bottom]vstack" 1572934058.mkv

  Concat Command

  ffmpeg
-i 1572934031.mkv -i 1572934056.mkv -i 1572934058.mkv -i 1572934089.mkv -i 1572934155.mkv -i 1572934169.mkv -i 1572934198.mkv -filter_complex "[0]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[0v];[1]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[1v];[2]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[2v];[3]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[3v];[4]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[4v];[5]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[5v];[6]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[6v];[0v][1v][2v][3v][4v][5v][6v]concat=n=7:v=1:a=0[v]" -map "[v]" 4c21f002fa76b148c00cc6fbceaa57ee.mp4

• How to solve Fatal error : Uncaught Alchemy\BinaryDriver\Exception\ExecutionFailureException : ffmpeg failed to execute command

  7 novembre 2019, par Ahmed Rashid

  I am trying to encode video using the PHP-FFMpeg library, but there are some errors that are shown to me. The errors :

  Fatal error : Uncaught
  Alchemy\BinaryDriver\Exception\ExecutionFailureException : ffmpeg
  failed to execute command "C :/FFmpeg/bin/ffmpeg.exe" -y -i video1.mp4
  -async 1 -metadata:s:v:0 start_time=0 -threads 12 -vcodec libx264 -acodec libfaac -b:v 1000k -refs 6 -coder 1 -sc_threshold 40 -flags +loop -me_range 16 -subq 7 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 -trellis 1 -b:a 128k -vf "[in]scale=320:240 [out]" -pass 1 -passlogfile "C :\Users\DELL\AppData\Local\Temp\ffmpeg-passes5d9e35f516ce1e66b8/pass-5d9e35f517030"
  export-x264.mp4 : Error Output : ffmpeg version N-95216-ge6625ca41f
  Copyright (c) 2000-2019 the FFmpeg developers built with gcc 9.2.1
  (GCC) 20190918 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-libtheor in C :\xampp\htdocs\AnimeX\s2\vendor\php-ffmpeg\php-ffmpeg\src\FFMpeg\Media\AbstractVideo.php
  on line 106`

  The library is PHP-FFMpeg library.