Recherche avancée

Sur d’autres sites (4863)

• Streaming with ffmpeg kills my internet connection

  31 juillet 2016, par John Smith

  Im trying to stream with ffmpeg to twitch.tv. Basically it works, but in time, my internet connection get knock-outed. I mean, if I run an infinite ping, I stop getting replies. Or I just cant browse on the internet.

  Basically I used it like this :

  ffmpeg -f dshow -i video="screen-capture-recorder" -vcodec libx264 -r
  25 -pix_fmt yuv420p -preset ultrafast -f flv
  "rtmp ://live.twitch.tv/app/live_****************"

  it works for minutes.

  But when I modify the command :

  ffmpeg -rtbufsize 1500M -f dshow -i video="screen-capture-recorder"
  -vcodec libx264 -r 25 -pix_fmt yuv420p -preset ultrafast -f flv "rtmp ://live.twitch.tv/app/live*******************"

  it just wont send anything and floods my connection (I mean, connection breaks)

  Of course, it sends me tons of "real-time buffer [screen-capture-recorder] [video input] too full or near too full (100% of size: 1500000000 [rtbufsize parameter])! frame dropped!" messages.

  Cant it be set to adapt to my internet bandwidth, or at least dont kill my connection ?

• 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-python crossfade transition for unknown number of photos

  28 septembre 2020, par Saya

  I want to convert a bunch of photos into a video with crossfade between them. The number of photos I am converting is variable
I am using the code from HERE to apply the crossfade :

  


  Since the number of photos are variable I looped over all the photos in the directory and generated the -loop and also the second part ([0:v]fade=t=out:st=4:d=1[v0] ;) :

  


  for i in range(os.listdir('photos')):
    if i == 0:
        text += f'\n-loop 1 -t 60 -i photos/Image{i+1}.jpg \\\n'
        text2 = '\n[0:v]fade=t=out:st=4:d=1[v0]; \\\n'
    else:
        text += f'-loop 1 -t 60 -i photos/Image{i+1}.jpg \\\n'
        text2 += f' [{i}:v]fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v{i}]; \\\n'

#And the Subprocess part  

command = f'ffmpeg \
    {text} \
    -filter-complex \
    {text2} -map "[v]" video/out.mp4'
p = subprocess.call(command, shell=True) 


  


  But this thing didn't create any video but said this :

  


  Use -h to get full help or, even better, run 'man ffmpeg'


  


  The full output :

  


  ffmpeg version git-2019-11-11-20c5f4d Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20191010
  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. 35.101 / 56. 35.101
  libavcodec     58. 61.100 / 58. 61.100
  libavformat    58. 34.101 / 58. 34.101
  libavdevice    58.  9.100 / 58.  9.100
  libavfilter     7. 66.100 /  7. 66.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

Use -h to get full help or, even better, run 'man ffmpeg'