Recherche avancée

Sur d’autres sites (9832)

• After scaled video, it convert transparent background to white

  8 mars 2017, par Sohaib Raza

  I scaled video using ffmpeg. When i scaled video, the output video having white background ,while the input video having transparent background.
  below command using for scaled video.

  ffmpeg -i inputVideo.mp4 -vf scale=100:100 outputVideo.mp4

  you can see the image below that is take from my video,for more understanding my problem.

  image from input video
  

  you can see the above image from input video having no white background.

  image from output video
  

  you can see the above image from output video having white backgournd.

  please give me your valuable answer regarding this question.
  any answer will be very appreciate.

  D: onProgress:   configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
D: onProgress:   libavutil      55. 17.103 / 55. 17.103
D: onProgress:   libavcodec     57. 24.102 / 57. 24.102
D: onProgress:   libavformat    57. 25.100 / 57. 25.100
D: onProgress:   libavdevice    57.  0.101 / 57.  0.101
D: onProgress:   libavfilter     6. 31.100 /  6. 31.100
D: onProgress:   libswscale      4.  0.100 /  4.  0.100
D: onProgress:   libswresample   2.  0.101 /  2.  0.101
D: onProgress:   libpostproc    54.  0.100 / 54.  0.100
D: onProgress: Input #0, gif, from '/storage/emulated/0/Pictures/eye.gif':
D: onProgress:   Duration: N/A, bitrate: N/A
D: onProgress:     Stream #0:0: Video: gif, bgra, 480x190, 5 fps, 10 tbr, 100 tbn, 100 tbc
D: onProgress: Output #0, gif, to '/storage/emulated/0/GIF/REV20170308_101145.gif':
D: onProgress:   Metadata:
D: onProgress:     encoder         : Lavf57.25.100
D: onProgress:     Stream #0:0: Video: gif, bgr8, 125x56, q=2-31, 200 kb/s, 10 fps, 100 tbn, 10 tbc
D: onProgress:     Metadata:
D: onProgress:       encoder         : Lavc57.24.102 gif
D: onProgress: Stream mapping:
D: onProgress:   Stream #0:0 -> #0:0 (gif (native) -> gif (native))
D: onProgress: Press [q] to stop, [?] for help
D: onProgress: frame=   11 fps=0.0 q=-0.0 Lsize=      17kB time=00:00:02.90 bitrate=  48.8kbits/s speed=14.8x<br />
D: onProgress: video:16kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.287261%
D: Started command : ffmpeg [Ljava.lang.String;@422f62d0
D: onSuccess: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
    built with gcc 4.8 (GCC)
    configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
    libavutil      55. 17.103 / 55. 17.103
    libavcodec     57. 24.102 / 57. 24.102
    libavformat    57. 25.100 / 57. 25.100
    libavdevice    57.  0.101 / 57.  0.101
    libavfilter     6. 31.100 /  6. 31.100
    libswscale      4.  0.100 /  4.  0.100
    libswresample   2.  0.101 /  2.  0.101
    libpostproc    54.  0.100 / 54.  0.100
  Input #0, gif, from '/storage/emulated/0/Pictures/eye.gif':
    Duration: N/A, bitrate: N/A
      Stream #0:0: Video: gif, bgra, 480x190, 5 fps, 10 tbr, 100 tbn, 100 tbc
  Output #0, gif, to '/storage/emulated/0/GIF/REV20170308_101145.gif':
    Metadata:
      encoder         : Lavf57.25.100
      Stream #0:0: Video: gif, bgr8, 125x56, q=2-31, 200 kb/s, 10 fps, 100 tbn, 10 tbc
      Metadata:
        encoder         : Lavc57.24.102 gif
  Stream mapping:
    Stream #0:0 -> #0:0 (gif (native) -> gif (native))
  Press [q] to stop, [?] for help
  frame=   11 fps=0.0 q=-0.0 Lsize=      17kB time=00:00:02.90 bitrate=  48.8kbits/s speed=14.8x<br />
  video:16kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.287261%

• avformat/mxfenc : add white/black ref /color range

  5 avril 2018, par Michael Niedermayer

  avformat/mxfenc : add white/black ref /color range
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/mxfenc.c
  • [DH] tests/ref/fate/copy-trac4914
  • [DH] tests/ref/fate/mxf-reel_name
  • [DH] tests/ref/fate/time_base
  • [DH] tests/ref/lavf/mxf
  • [DH] tests/ref/lavf/mxf_d10
  • [DH] tests/ref/lavf/mxf_dv25
  • [DH] tests/ref/lavf/mxf_dvcpro50
  • [DH] tests/ref/lavf/mxf_opatom
  • [DH] tests/ref/lavf/mxf_opatom_audio

• ffmpeg throwing System.AccessViolationException

  25 septembre 2020, par shmit

  I am using ffmpeg to extract frames and iterate over them. The codes iterates correctly over few frames and then then randomly throws error

  


  "System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.'



  


  Any suggestions on how to resolve it ? System details and screenshot below :

  


  System Details :
OS : Windows
TargetFramework : .netCore3.1
Nugets : FFMediaToolkit v3.0.0 and SixLabors.ImageSharp v1.0.0
Shared dlls copied from : https://ffmpeg.zeranoe.com/builds/ for version 4.2.2