Newest 'ffmpeg' Questions - Stack Overflow

Les articles publiés sur le site

• chroma key my command for filter white background works but filter white and black ?

  21 décembre 2018, par userpov

  ffmpeg    -i  bakground.avi   -i overlay.avi    -filter_complex       "[1:v]chromakey=0xFFFFFF:0.02:0[keyed];       [0:v][keyed]overlay[out]"    -map "[out]"    output.avi
  

  this command filter white and black

  I need filter only white color

  please help me

• how I could do green screen effect in ffmpeg for put a image into video with whte background using ffmpeg ?

  20 décembre 2018, par userpov

  how I could do a green effect but instead of green color change all white color for another background

  like this video

  https://www.youtube.com/watch?v=zgge8y9YUEs

  please help me

• How to disable libx264 stderr output ?

  20 décembre 2018, par Dave

  I'm writing a library that uses the ffmpeg library interface (libavcodec, libavformat, libavutil, etc.) to manipulate some video. Part of this involves some encoding for which I'm using libx264. Everything works great but libx264 writes output to stderr, for example:

  [libx264 @ 0x62cbc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
  [libx264 @ 0x62cbc0] profile High, level 5.0, 4:2:0, 8-bit
  [libx264 @ 0x62cbc0] frame I:28    Avg QP:26.78  size:144822
  [libx264 @ 0x62cbc0] frame P:135   Avg QP:32.21  size: 30853
  [libx264 @ 0x62cbc0] frame B:108   Avg QP:36.18  size: 15709
  [libx264 @ 0x62cbc0] consecutive B-frames: 20.3% 79.7%
  [libx264 @ 0x62cbc0] mb I  I16..4:  9.5% 75.9% 14.6%
  [libx264 @ 0x62cbc0] mb P  I16..4:  1.1%  1.5%  1.4%  P16..4: 44.8%  9.6%  4.2%  0.0%  0.0%    skip:37.5%
  [libx264 @ 0x62cbc0] mb B  I16..4:  0.3%  0.2%  0.4%  B16..8: 49.8%  4.6%  0.9%  direct: 1.0%  skip:42.7%  L0:46.9% L1:49.8% BI: 3.2%
  [libx264 @ 0x62cbc0] final ratefactor: 26.71
  [libx264 @ 0x62cbc0] 8x8 transform intra:68.4% inter:70.4%
  [libx264 @ 0x62cbc0] direct mvs  spatial:87.0% temporal:13.0%
  [libx264 @ 0x62cbc0] coded y,uvDC,uvAC intra: 76.2% 73.8% 31.6% inter: 9.7% 9.5% 4.2%
  [libx264 @ 0x62cbc0] i16 v,h,dc,p:  9% 57%  7% 27%
  [libx264 @ 0x62cbc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  9% 21%  4%  8%  9%  7% 12%  7% 22%
  [libx264 @ 0x62cbc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 28%  9%  6%  6%  6% 10%  6% 16%
  [libx264 @ 0x62cbc0] i8c dc,h,v,p: 20% 50% 19% 11%
  [libx264 @ 0x62cbc0] Weighted P-Frames: Y:0.0% UV:0.0%
  [libx264 @ 0x62cbc0] ref P L0: 73.2% 12.6% 10.0%  2.7%  1.1%  0.3%
  [libx264 @ 0x62cbc0] ref B L0: 92.3%  5.6%  1.7%  0.4%
  [libx264 @ 0x62cbc0] kb/s:7912.01
  

  It is not acceptable for my library to write to stdout or stderr. How can I programmatically disable this output to stderr?

  I realize that I can "hijack" stderr, but this seems like a crude hack and I would strongly prefer not to do so.

• FFMPEG Add Concat to Combined commands

  20 décembre 2018, par Sie

  here is my current code

  ffmpeg -i "Video.mp4" -i "Watermark.png" -ss 00:00:30 -t 00:09:32 -filter_complex "overlay=0:0" "Video-Out.mp4"
  

  i have an intro video which i want to combine alongside the above command so it adds the intro video then the Video-Out.mp4

  intro video > trimmed video with watermark combined as one

  note* the intro video is a different codec since i exported it via sony vegas

• RTSP Streaming on HTML page [on hold]

  20 décembre 2018, par Sajal Gupta

  I'm streaming from my IP Camera via RTSP protocol and able to watch live stream on VLC Player but I want to receive this stream in Java Code and save it into a file and also stream it on HTML page simultaneously. I tried using multiple plugins which are either unable to transcode or read RTSP URL. I also tried to read this stream via inputStream but getting null from it. I also tried websocket to listen to this stream but websocket is also returning null. I'm able to create file using ffmpeg from terminal but I want to do this through Java Code. I used vlcj library in java but it is also returning a deadlock error. Streamedian is paid and VXG Media Player is stuck on loader forever. Is there a way to stream and save RSTP stream simultaneously via Java/Grails code ?