Recherche avancée

Sur d’autres sites (5389)

• FFmpeg - Generating waveform image from webm file not working due to overlay filter

  18 juillet 2018, par jfizz

  I am attempting to generate a waveform image from a webm file. I am using the overlay filter to overlay the waveform atop a background. The waveform does not show whenever the overlay filter is used. The failing command :

  ffmpeg -i big_buck_bunny.webm -filter_complex "showwavespic=s=640x120[fg];color=s=640x120:color=#ff0000[bg];[bg][fg]overlay=format=auto" -frames:v 1 output.jpg

  The result :

  

  I have also tried using an image as the background with the same result :

  ffmpeg -i big_buck_bunny.webm -i bg.jpg -filter_complex "showwavespic=s=640x120[fg];[1:v][fg]overlay=format=auto" -frames:v 1 output.jpg

  Generating a waveform without a background works as expected :

  ffmpeg -i big_buck_bunny.webm -filter_complex "showwavespic=s=640x120" -frames:v 1 output.jpg

  

  Here is the video I am using.

  I have tried various webm files with the same result. I also tested some .mp4,.mov,.ogv files which worked as expected. I am using the latest ffmpeg version, below is my banner.

  ffmpeg version 4.0.1 Copyright (c) 2000-2018 the FFmpeg developers
  
  built with Apple LLVM version 9.1.0 (clang-902.0.39.2)
  
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.1 --enable-shared -- 
  
  enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --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

• Split 2 video FFMpeg

  19 juillet 2018, par Евгений Бреус

  can you help me split 2 videos
  enter image description here

  ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex "[0:v][1:v]vstack[v];[0:a][1:a]amerge=inputs=2[a]" -map "[v]" -map "[a]" -ac 2 output.mp4

  Don’t work

  My complete log

      C:\Users\forumrulez\Desktop\POST>ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex "[0:v][1:v]vstack[v];[0:a][1:a]amerge=inputs=2[a]" -map "[v]" -map "[a]" -ac 2 output.mp4
  
  ffmpeg version N-91447-g0bd48ab2d9 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.3.1 (GCC) 20180709
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  
    libavutil      56. 18.102 / 56. 18.102
  
    libavcodec     58. 21.104 / 58. 21.104
  
    libavformat    58. 17.101 / 58. 17.101
  
    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
  
    libpostproc    55.  2.100 / 55.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.17.101
  
    Duration: 00:01:00.08, start: 0.000000, bitrate: 586 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 260x480 [SAR 128:39 DAR 16:9], 428 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 152 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'input2.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.17.101
  
    Duration: 00:01:00.08, start: 0.000000, bitrate: 703 kb/s
  
      Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 360x480 [SAR 64:27 DAR 16:9], 545 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 152 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  File 'output.mp4' already exists. Overwrite ? [y/N] y
  
  Stream mapping:
  
    Stream #0:0 (h264) -> vstack:input0
  
    Stream #0:1 (aac) -> amerge:in0
  
    Stream #1:0 (h264) -> vstack:input1
  
    Stream #1:1 (aac) -> amerge:in1
  
    vstack -> Stream #0:0 (libx264)
  
    amerge -> Stream #0:1 (aac)
  
  Press [q] to stop, [?] for help
  
  [Parsed_amerge_1 @ 00000165b1e6af00] No channel layout for input 1
  
  [Parsed_amerge_1 @ 00000165b1e6af00] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
  
  [Parsed_vstack_0 @ 00000165b29f1040] Input 1 width 360 does not match input 0 width 260.
  
  [Parsed_vstack_0 @ 00000165b29f1040] Failed to configure output pad on Parsed_vstack_0
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #1:0
  
  Conversion failed!

• Ubuntu 16.04 + OpenCV + FFMPEG + CUDA don't open default camera

  20 juillet 2018, par Newton Pasqualini Filho

  I am trying to work with accelerated OpenCV using my own build of FFMPEG with CUDA support for GPU video processing using Python.

  My application must support any kind of video devices, including USB and IP cameras.

  I have a config file parsed with ConfigParser that loads the camera device path, as described in OpenCV documentation we can access usb camera by index number and for IP camera we use RTSP protocol so the path could be sometimes 0 or rtsp://192.168.1.2/0.

  To force the use of FFMPEG behind OpenCV I am trying to open the video capture stream like bellow :

  video_capture = cv.VideoCapture()
  
  stream_opened = video_capture.open(camera_path, cv.CAP_FFMPEG)

  The problem is when I try to open the default USB camera camera_path = 0 the video_capture.open method always returns false, but when it is a RTSP like camera_path = "rtsp://192.168.1.2/1" it open the video capture stream ok.

  When I let OpenCV decide what backend will be used it calls to GStreammer and it opens the capture stream like this :

  video_capture = cv.VideoCapture(camera_path)

  I suspect that FFMPEG does not have any support for capture video from a USB camera, does it ? Is there some missing feature to my ffmpeg build ?

  ffmpeg version N-91487-g1809f1c Copyright (c) 2000-2018 the FFmpeg developers
  
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
  configuration: --prefix=/usr --pkg-config-flags=--static --enable-cuda-sdk --enable-cuvid --enable-libnpp --extra-cflags=-I/usr/local/cuda/include/ --extra-ldflags=-L/usr/local/cuda/lib64/ --nvccflags='-gencode arch=compute_61,code=sm_61 -O2' --enable-gpl --enable-libass --enable-libfdk-aac --enable-libx264 --extra-libs=-lpthread --enable-libx265 --enable-nvenc --enable-nonfree
  
  libavutil      56. 18.102 / 56. 18.102
  
  libavcodec     58. 21.105 / 58. 21.105
  
  libavformat    58. 17.101 / 58. 17.101
  
  libavdevice    58.  4.101 / 58.  4.101
  
  libavfilter     7. 26.100 /  7. 26.100
  
  libswscale      5.  2.100 /  5.  2.100
  
  libswresample   3.  2.100 /  3.  2.100
  
  libpostproc    55.  2.100 / 55.  2.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...