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• How to encode HEVC tile in JPEG ?

  3 juillet 2018, par Ketan Chauhan

  I am trying to convert HEIF file into a JPEG file, I extract HEIC images tiles using MP4Box but when convert these tiles into JPEG using FFMPEG I get this :

  SAKATA-INX:desktop stellar$ MP4Box -dump-item 1:path=item1.hevc
  still_rear.HEIC

  ICC colour profile not supported ICC colour profile not supported

  SAKATA-INX:desktop stellar$ ffmpeg -i item1.hevc -frames:v 1 -vsync
  vfr -q:v 1 -an test.jpg

  ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers built
  with Apple LLVM version 9.1.0 (clang-902.0.39.1)

  configuration : —prefix=/usr/local/Cellar/ffmpeg/4.0 —enable-shared
  —enable-pthreads —enable-version3 —enable-hardcoded-tables —enable-avresample —cc=clang —host-cflags= —host-ldflags= —enable-gpl —enable-libmp3lame —enable-libx264 —enable-libx265 —enable-libxvid —enable-opencl —enable-videotoolbox —disable-lzma

  libavutil 56. 14.100 / 56. 14.100

  libavcodec 58. 18.100 / 58. 18.100

  libavformat 58. 12.100 / 58. 12.100

  libavdevice 58. 3.100 / 58. 3.100

  libavfilter 7. 16.100 / 7. 16.100

  libavresample 4. 0. 0 / 4. 0. 0

  libswscale 5. 1.100 / 5. 1.100

  libswresample 3. 1.100 / 3. 1.100

  libpostproc 55. 1.100 / 55. 1.100

  [hevc @ 0x7fc56e808e00] Format hevc detected only with low score of 1,
  misdetection possible !

  [hevc @ 0x7fc56f800000] No start code is found.

  [hevc @ 0x7fc56f800000] missing picture in access unit

  [AVBSFContext @ 0x7fc56e505e00] No start code is found.

  item1.hevc : could not find codec parameters

  Input #0, hevc, from ’item1.hevc’ :

  Duration : N/A, bitrate : N/A

  Stream #0:0: Video: hevc, none, 1200k tbn

  Output #0, image2, to ’test.jpg’ :

  Output file #0 does not contain any stream

  Could any one tell me how I can do this ?

• FFmpeg android - Fontconfig error : Cannot load default config file

  14 janvier 2019, par Linda Thomas

  I am trying to add text over video using ffmpeg in android by

  "-i", "/storage/emulated/0/videoplayback.mp4", "-vf","drawtext=fontfile=file:///android_asset/fonts/georgia.ttf:text='Text_to_write':fontsize=20:x=100:y=100","-codec:a", "copy", newVideoPath

  and it showing the error log as

  ffmpeg version n4.0-39-gda39990 Copyright (c) 2000-2018 the FFmpeg
  
  developers
  
  built with gcc 4.9.x (GCC) 20150123 (prerelease)
  
  configuration: --target-os=linux --cross-prefix=/root/bravobit/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi-
  
  --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/root/bravobit/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-ffprobe --enable-libopus --enable-libvorbis --enable-libfdk-aac --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-libvpx --enable-libass --enable-yasm --enable-pthreads --disable-debug --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-linux-perf --disable-doc --disable-shared --enable-static --enable-runtime-cpudetect --enable-nonfree --enable-network --enable-avresample --enable-avformat --enable-avcodec --enable-indev=lavfi --enable-hwaccels --enable-ffmpeg --enable-zlib --enable-gpl --enable-small --enable-nonfree --pkg-config=pkg-config --pkg-config-flags=--static --prefix=/root/bravobit/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/root/bravobit/ffmpeg-android/toolchain-android/include
  
  -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/root/bravobit/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-cxxflags=
  
  libavutil56. 14.100 / 56. 14.100
  
  libavcodec     58. 18.100 / 58. 18.100
  
  libavformat    58. 12.100 / 58. 12.100
  
  libavdevice    58.  3.100 / 58.  3.100
  
  libavfilter     7. 16.100 /  7. 16.100
  
  libavresample   4.  0.  0 /  4.  0.  0
  
  libswscale5.  1.100 /  5.  1.100
  
  libswresample   3.  1.100 /  3.  1.100
  
  libpostproc    55.  1.100 / 55.  1.100
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/videoplayback.mp4':
  
  Metadata:
  
    major_brand     : mp42
  
    minor_version   : 0
  
    compatible_brands: isommp42
  
    creation_time   : 2018-05-19T10:21:06.000000Z
  
  Duration: 00:00:27.07, start: 0.000000, bitrate: 730 kb/s
  
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 640x360 [SAR 1:1 DAR 16:9], 639 kb/s, 29.83 fps, 29.83 tbr,
  
  29827 tbn, 59.65 tbc (default)
  
    Metadata:
  
      creation_time   : 2018-05-19T10:21:06.000000Z
  
      handler_name    : ISO Media file produced by Google Inc. Created on: 05/19/2018.
  
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s (default)
  
    Metadata:
  
      creation_time   : 2018-05-19T10:21:06.000000Z
  
      handler_name    : ISO Media file produced by Google Inc. Created on: 05/19/2018.
  
      Stream mapping:
  
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Stream #0:1 -> #0:1 (copy)
  
      Press [q] to stop, [?] for help
  
      Fontconfig error: Cannot load default config file
  
      [Parsed_drawtext_0 @ 0xb7af4560] impossible to init fontconfig
  
      [AVFilterGraph @ 0xb7af3870] Error initializing filter 'drawtext' with args
  
  'fontfile=file:///android_asset/fonts/georgia.ttf:text=Text_to_write:fontsize=20:x=100:y=100'
  
      Error reinitializing filters!
  
      Failed to inject frame into filter network: Unknown error occurred
  
      Error while processing the decoded data for stream #0:0
  
      Conversion failed!

• Compile the GPU version of FFMPEG on OpenCV

  22 juin 2018, par Dyex719

  When I try to use GPU
  FFMPEG on opencv by using a command like :

  VideoCapture cap("rtsp link");
  
  
  
  for(;;)
  
  {
  
  mat frame;
  
  cap>>frame;
  
  }

  I don’t see any output on nvidia-smi despite compiling the GPU version of FFMPEG.

  I am trying to get FFMPEG to use GPU to improve the speed of my program. I got FFMPEG from cloning https://git.ffmpeg.org/ffmpeg.git and followed the steps here https://developer.nvidia.com/ffmpeg to get it working.

  I have validated the results using nvidia-smi dmon -i 0 and have seen that dec% increases when I run the command ffmpeg -c:v h264_cuvid -i test_video.mp4 test_output.mkv.

  I then compiled Opencv to use the GPU enabled FFMPEG, I check this by running getBuildInformation from opencv :

  Video I/O:
DC1394 1.x: NO
DC1394 2.x: YES (ver 2.2.4)
FFMPEG: YES
codec: YES (ver 58.20.103)
format: YES (ver 58.17.100)
util: YES (ver 56.18.102)
swscale: YES (ver 5.2.100)
resample: NO
gentoo-style: YES
GStreamer: NO
OpenNI: NO
OpenNI PrimeSensor Modules: NO
OpenNI2: NO
PvAPI: NO
GigEVisionSDK: NO
UniCap: NO
UniCap ucil: NO
V4L/V4L2: NO/YES
XIMEA: NO
Xine: NO
gPhoto2: NO

  I cross-verify that I’m using the same ffmpeg (by checking the version numbers) :

  ffmpeg version N-91273-g67747c8 Copyright (c) 2000-2018 the FFmpeg developers
 built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
 configuration: --enable-cuda --enable-cuvid --enable-nvenc --enable-nonfree --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64
 libavutil      56. 18.102 / 56. 18.102
 libavcodec     58. 20.101 / 58. 20.101
 libavformat    58. 17.100 / 58. 17.100
 libavdevice    58.  4.101 / 58.  4.101
 libavfilter     7. 25.100 /  7. 25.100
 libswscale      5.  2.100 /  5.  2.100
 libswresample   3.  2.100 /  3.  2.100

  Please advise me on how I should compile OpenCV to use the GPU version of FFMPEG. Thank you !