Recherche avancée

Sur d’autres sites (9937)

• AForge.Video.VideoFileWriter, Video Quality loss after a second

  29 décembre 2019, par Just another Dev

  I tried to use AForge to create mp4 video from images..but experience this quality loss after about 1 - 2 second into the video. Just wondering if anyone knows what went wrong with my code ?

  using AForge.Video.FFMPEG;
  
  VideoFileWriter writer = new VideoFileWriter();
  
  writer.Open(fileName, _width, _height, _frameRate, VideoCodec.MPEG4, 800000);
  
  var s = AForge.Imaging.Image.FromFile(@"[path]\image.jpg");
  
  int frameCount = _frameRate * scene.Time;
  
  for (int i = 0; i < frameCount; i++)
  
  {
  
      writer.WriteVideoFrame(s);
  
  }
  
  writer.Close();

  I use the above code to create a 3 second 1080p video with frame rate 60, bit rate 800k, and using this image as an example : https://www.bushandbeach.co.nz/wp-content/uploads/2019/05/A-Taste-of-Auckland-Full-Day-1-opt.jpg

  the output video is in here : https://youtu.be/j0z7711cyOM

  as you can see the image quality seems to be ok, for about 2 seconds and then it blurs out in the last second.

  Thanks so much

• FFMPEG command works on Mac but not on Windows [duplicate]

  24 décembre 2019, par Arthur

  This question is an exact duplicate of :

  • Creating video from images produces black screen video for certain image formats [duplicate]
    
    1 answer
    

  Hi I’m working on a project which needs to create animations by playing 2000 charts in 50 fps using FFMPEG, the command is :

  ffmpeg -y -framerate 50 -i img-%04d.png -vb 40M -vcodec h264 esez.mp4

  charts are located in the same folder with name as img-0001.png img-2000.png

  It worked well on my Mac. On Windows, the command can run and generate a mp4 file. But the animation is just black screen on Windows media player. I also tried open with VLC, it has some image, but not proper at all.

  log from Windows CMD :

  ffmpeg version git-2019-12-11-4110029 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20191125
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --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-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 36.101 / 56. 36.101
  
    libavcodec     58. 64.101 / 58. 64.101
  
    libavformat    58. 35.101 / 58. 35.101
  
    libavdevice    58.  9.101 / 58.  9.101
  
    libavfilter     7. 68.100 /  7. 68.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Input #0, image2, from 'img-%04d.png':
  
    Duration: 00:00:40.18, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgba(pc), 1000x800, 50 fps, 50 tbr, 50 tbn, 50 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 00000242aaacc6c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 00000242aaacc6c0] profile High 4:4:4 Predictive, level 3.2, 4:4:4, 8-bit
  
  [libx264 @ 00000242aaacc6c0] 264 - core 158 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=40000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'esez.mp4':
  
    Metadata:
  
      encoder         : Lavf58.35.101
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 1000x800, q=-1--1, 40000 kb/s, 50 fps, 12800 tbn, 50 tbc
  
      Metadata:
  
        encoder         : Lavc58.64.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/40000000 buffer size: 0 vbv_delay: N/A
  
  frame= 2009 fps= 90 q=-1.0 Lsize=    7569kB time=00:00:40.12 bitrate=1545.6kbits/s speed= 1.8x
  
  video:7545kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.322921%
  
  [libx264 @ 00000242aaacc6c0] frame I:9     Avg QP: 0.35  size: 60878
  
  [libx264 @ 00000242aaacc6c0] frame P:511   Avg QP: 0.74  size:  5275
  
  [libx264 @ 00000242aaacc6c0] frame B:1489  Avg QP: 4.35  size:  3010
  
  [libx264 @ 00000242aaacc6c0] consecutive B-frames:  0.7%  0.7%  2.2% 96.4%
  
  [libx264 @ 00000242aaacc6c0] mb I  I16..4: 85.1%  1.6% 13.3%
  
  [libx264 @ 00000242aaacc6c0] mb P  I16..4:  0.7%  0.0%  0.2%  P16..4:  1.3%  0.8%  0.4%  0.0%  0.0%    skip:96.7%
  
  [libx264 @ 00000242aaacc6c0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  1.6%  0.7%  0.2%  direct: 0.1%  skip:97.2%  L0:48.2% L1:39.0% BI:12.8%
  
  [libx264 @ 00000242aaacc6c0] final ratefactor: -35.51
  
  [libx264 @ 00000242aaacc6c0] 8x8 transform intra:2.6% inter:5.9%
  
  [libx264 @ 00000242aaacc6c0] coded y,u,v intra: 12.9% 2.5% 2.6% inter: 0.9% 0.5% 0.6%
  
  [libx264 @ 00000242aaacc6c0] i16 v,h,dc,p: 84% 14%  2%  0%
  
  [libx264 @ 00000242aaacc6c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18%  2% 77%  0%  1%  1%  0%  0%  0%
  
  [libx264 @ 00000242aaacc6c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 22% 19%  4%  4%  4%  4%  6%  2%
  
  [libx264 @ 00000242aaacc6c0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 00000242aaacc6c0] ref P L0: 60.2%  0.7% 21.4% 17.7%
  
  [libx264 @ 00000242aaacc6c0] ref B L0: 72.6% 20.2%  7.3%
  
  [libx264 @ 00000242aaacc6c0] ref B L1: 88.4% 11.6%
  
  [libx264 @ 00000242aaacc6c0] kb/s:1538.15

  Could anybody please help me with this problem ?

  Happy Holiday to all !

• ffmpeg function/alias in .bash_aliases [duplicate]

  29 décembre 2019, par unammusic

  This question already has an answer here :

  • How do I use variables in single quoted strings ?
    
    7 answers
    

  I’m trying to build a function in my aliases to avoid typing the whole ffmpeg command everytime for a simple video cut like this :

  ffmpeg -ss 00:00:00 -t 00:00:10 -i video.mp4 -vcodec copy -acodec copy video_cut.mp4

  So I came up with this idea :

  function ffmpeg-cut () {
  
    ffmpeg -ss '$1' -t '$2' -i '$3' -vcodec copy -acodec copy '$3'_cut.mp4
  
  }

  or as a one liner :

  alias ffmpeg-cut='ffmpeg -ss '$1' -t '$2' -i '$3' -vcodec copy -acodec copy '$3'_cut.mp4'

  I guess it’s some kind of syntax error but I can’t figure out. Anyone any idea ? This is my output when I try :

  es@es-ubuntu-station:~/Downloads$ ffmpeg-cut 00:00:00 00:00:10 cut-test.mp4 
  
  ffmpeg version 4.1.4-1build2 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9 (Ubuntu 9.2.1-4ubuntu1)
  
    configuration: --prefix=/usr --extra-version=1build2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Invalid duration specification for ss: -t

  What am I doing wrong ?

  Thanks in advance for help !