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• FFMPEG rotates images

  13 juin 2016, par Jaketr00

  I am trying to mass-resize images using FFMPEG, and I successfully did it using bash, but I noticed that some of the portrait images got rotated to landscape. Here is the original image, but as you see below, it gets rotated.

  

  As you see above, the image is rotated. At first, I thought this was due to the -vf scale flag that I was using to resize the images, but I tried the following command and it still rotated the image.

  ffmpeg -i input.jpg output.jpg

  This doesn’t happen with every image, and even not all the portrait images. Also, some images rotate clockwise, while some rotate counter-clockwise. And this isn’t a random occurrence, all the images that originally rotated still rotate no matter how many times I run the command.

  Console Output

  ffmpeg version N-79942-gdc34fa6-tessus Copyright (c) 2000-2016 the FFmpeg developers
  
    built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
  
    configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --as=yasm --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzmq --enable-version3 --disable-ffplay --disable-indev=qtkit --disable-indev=x11grab_xcb
  
    libavutil      55. 23.100 / 55. 23.100
  
    libavcodec     57. 38.100 / 57. 38.100
  
    libavformat    57. 35.100 / 57. 35.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 44.100 /  6. 44.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, image2, from '/Users/jaketr00/Desktop/IMG_1902.JPG':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 1025494 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 5184x3456, 25 tbr, 25 tbn
  
  [image2 @ 0x7ff751803e00] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Output #0, image2, to '/Users/jaketr00/Desktop/IMG_19022.JPG':
  
    Metadata:
  
      encoder         : Lavf57.35.100
  
      Stream #0:0: Video: mjpeg, yuvj422p(pc), 5184x3456, q=2-31, 200 kb/s, 25 fps, 25 tbn
  
      Metadata:
  
        encoder         : Lavc57.38.100 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  frame=    1 fps=0.0 q=8.2 size=N/A time=00:00:00.04 bitrate=N/A speed=0.0753x   frame=    1 fps=0.0 q=8.2 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.0752x    
  
  video:554kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  Is there any way to stop this from happening ?

• Adding a watermark with FFMPEG via Rails

  16 juin 2016, par Felix

  in my Rails app I want to use ffmpeg to add a watermark to a movie while uploading.

  For that I’ve added the stremio-ffmpeg gem.

  My code looks like this :

  options = {watermark: Rails.root.join('public/images/logo_klein.png'), watermark_filter: {position: "RT", padding_x: 10, padding_y: 10}, custom: '-strict experimental'}
  
  
  
  tmp_path = File.join File.dirname(current_path), "tmp_file.mp4"
  
  file = FFMPEG::Movie.new(self.file.path)
  
  file.transcode(tmp_path, options)
  
  
  
  File.rename tmp_path, current_path

  But my Image is not added to the movie. wenn I call http://localhost/images/logo_klein.php it is shown in browser (image)

  What could be the problem for not added into the movie ? When I follow the console out transcoding is started properly. But nothing mentioned of watermarking only transcoding is mentiond

  console output :

   INFO -- : Running transcoding...
  
  ffmpeg -y -i /var/www/ji/public/uploads/tmp/1466030485-10470-0                                                              013-4987/2016-06-08_09.50.55.mp4   -strict experimental /var/www/ji/public/uploads/tmp/1466030485-10470-0013-4987/tmp_file.mp4

  What could be the problem ?

• Using the ffmpeg to extract video stream

  27 juin 2016, par user1395066

  I try to extract the video stream from the bbb-1920x1080-cfg02.mkv

  The command as follows.

  ffmpeg -i bbb-1920x1080-cfg02.mkv -map 0:0 -c copy bbb.mkv

  But the output file can’t play with the player(potplayer)

  I used the ffmpeg -i bbb.mkv to check the information and there were lots of
  error messages.

  ffmpeg version N-80680-ga887fbb Copyright (c) 2000-2016 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
  configuration: --enable-vaapi --disable-vda --disable-vdpau --disable-libxcb  --disable-ffplay --disable-ffserver --disable-ffprobe --disable-indev=jack --disable-outdev=sdl --enable-libx264 --enable-libx265 --enable-gpl --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --disable-libxcb-shape --disable-x11grab
  
  libavutil      55. 26.100 / 55. 26.100
  
  libavcodec     57. 46.100 / 57. 46.100
  
  libavformat    57. 40.101 / 57. 40.101
  
  libavdevice    57.  0.101 / 57.  0.101
  
  libavfilter     6. 46.102 /  6. 46.102
  
  libswscale      4.  1.100 /  4.  1.100
  
  libswresample   2.  1.100 /  2.  1.100
  
  libpostproc    54.  0.100 / 54.  0.100
  
  [hevc @ 0x3a64a60] No start code is found.
  
  [hevc @ 0x3a64a60] Error splitting the input into NAL units.
  
  [hevc @ 0x3a64a60] No start code is found.

  Even I just make a copy of the source file.

  ffmpeg -i bbb-1920x1080-cfg02.mkv -map 0 -c copy bbb.mkv

  The output file(bbb.mkv) still can’t play with the player(potplayer)
  It still has "[hevc @ 0x3a64a60] No start code is found" error.

  As the document said that it would do notthing but just encapsulate the matroska format.

  Is anyone can teach me how to figure out this problem ?

  Thanks