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• How to avoid color shift using FFmpeg libx264

  7 septembre 2021, par florit

  I’d like to convert some footage to proxy H.264 using ffmpeg. I got a slight colorshift using the following command:

  ffmpeg -i /path/to/045_0054.MXF -map 0 -dn -c:v libx264 -preset slow -profile:v main -level:v 4.1 -coder 1 -pix_fmt yuv420p -crf 25 -vf "scale=1280:720:flags=lanczos" -movflags +faststart -colorspace 1 -color_primaries 1 -color_trc 1 -color_range 1 -brand mp42 -refs 1 -x264-params b-pyramid=0 -bf 2 -g 5 -y /path/to/045_0054.mp4
  

  How can I get rid of the slight magenta shift?

  mediainfo prints the following about the source file:

  General
  Complete name                            : /path/to/045_0054.MXF
  Format                                   : MXF
  Format version                           : 1.3
  Format profile                           : OP-1a
  Format settings                          : Closed / Complete
  File size                                : 180 MiB
  Duration                                 : 14 s 720 ms
  Overall bit rate mode                    : Variable
  Overall bit rate                         : 102 Mb/s
  Encoded date                             : 2021-02-19 13:13:15.000
  Writing application                      : Sony Mem 2.00
  
  Video
  ID                                       : 2
  Format                                   : AVC
  Format/Info                              : Advanced Video Codec
  Format profile                           : High@L5.1
  Format settings                          : CABAC / 2 Ref Frames
  Format settings, CABAC                   : Yes
  Format settings, Reference frames        : 2 frames
  Format settings, GOP                     : M=3, N=6
  Format settings, wrapping mode           : Frame
  Codec ID                                 : 0D01030102106001-0401020201314001
  Duration                                 : 14 s 720 ms
  Bit rate mode                            : Variable
  Bit rate                                 : 97.8 Mb/s
  Maximum bit rate                         : 100.0 Mb/s
  Width                                    : 3 840 pixels
  Height                                   : 2 160 pixels
  Display aspect ratio                     : 16:9
  Frame rate                               : 25.000 FPS
  Color space                              : YUV
  Chroma subsampling                       : 4:2:0
  Bit depth                                : 8 bits
  Scan type                                : Progressive
  Bits/(Pixel*Frame)                       : 0.472
  Stream size                              : 172 MiB (95%)
  Color range                              : Limited
  Color primaries                          : BT.709
  Transfer characteristics                 : BT.709
  Matrix coefficients                      : BT.709
  

• How to enable libx264 for FFmpeg on Elastic Beanstalk

  2 août 2021, par user15575918

  My question is very similar to that of this person, but the suggested answer did not work for me.

  Using the following ffmpeg.config file in .ebextensions I am able to install ffmpeg, but without the libx264 codec.

  packages:
    yum:
      autoconf: []
      automake: []
      cmake: []
      freetype-devel: []
      gcc: []
      gcc-c++: []
      git: []
      libtool: []
      make: []
      nasm: []
      pkgconfig: []
      zlib-devel: []
  sources:
    /usr/local/src: http://ffmpeg.org/releases/ffmpeg-4.4.tar.bz2
  commands:
      ffmpeg_install:
        cwd: /usr/local/src/ffmpeg-4.4
        command: sudo ./configure --prefix="/usr" --enable-gpl && make && make install
  

  And so, to install libx264, I have tried replacing the lines after commands: with:

    01-install_libx264:
        cwd: /usr/local/src/
        command: git clone https://code.videolan.org/videolan/x264.git && cd x264 && ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" && make && make install
    02-ffmpeg_install:
        cwd: /usr/local/src/ffmpeg-4.4
        command: sudo ./configure --prefix="/usr" --enable-gpl --enable-libx264 && make && make install
  

  It didn't work, so I tried:

    01-install_libx264:
        cwd: /usr/local/src/
        command: curl -L -O https://code.videolan.org/videolan/x264/-/archive/master/x264-master.tar.bz2 && tar xjvf x264-master.tar.bz2 && cd x264-master && ./configure --bindir="$HOME/bin" --disable-shared --enable-nasm && make && make install
    02-ffmpeg_install:
        cwd: /usr/local/src/ffmpeg-4.4
        command: sudo ./configure --prefix="/usr" --enable-gpl --enable-libx264 && make && make install
  

  Neither have worked. Any ideas what I'm doing wrong here? Deployment fails, log says "Unsuccessful command execution on instance", but no further detail. Is there any way to debug the command execution better?

• Error : undefined reference to `x264_encoder_open_155'

  27 juillet 2021, par Shankar

  I had done

  sudo apt-get update
  sudo apt-get upgrade
  

  after that i am getting this error while compiling project:

  ffmpeg/libavcodec/libx264.c:948: undefined reference to `x264_encoder_open_155'

  Even i tried to build ffmpeg, i still got same error. Is there any solution or suggestions for this error?

• FFmpeg : Attach metadata to the segment muxer

  25 juillet 2021, par Maria

  I tried to attach metadata to the segment muxer using bitstream filter with no success, Please tell me how can do it?

• ffmpeg-kit(macOS swift) - FATAL : Unknown encoder 'libx264'

  21 juillet 2021, par Noob

  I am using FFMPEG-Kit in my macOS app to compress the video file. While executing arguments along with libx264 I am getting FATAL: Unknown encoder 'libx264' I am not sure where to enable libx264. I am using cocoa-pod pod 'ffmpeg-kit-macos-full', '~> 4.4.LTS'. Please help me to resolve this problem. Thank you all.

  Below argument perfectly works in my system.

  Code:

  let arguement = "-i \(sourceURL.path) -c:v libx264 -crf 28 \(destinationURL.path)"
  
  guard let session = FFmpegKit.execute(arguement) else {
      
      print("FFMPEG: Session not created!")
      return
  }
  guard let returnCode = session.getReturnCode() else {
      
      print("FFMPEG: Error return code!")
      return
  }
  
  if ReturnCode.isSuccess(returnCode){
      
      print("FFMPEG: Success")
  }else if ReturnCode.isCancel(returnCode){
      
      print("FFMPEG: Cancelled.")
  }else{
      
      print("FFMPEG: failed. \(FFmpegKitConfig.sessionState(toString: session.getState()))")
  
  }
  

  Error:

  Unknown encoder 'libx264'