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• ffmpeg - Replace one word audio in video at different specific timeline [duplicate]

  17 décembre 2019, par Siddharth

  This question is an exact duplicate of :

  • Can I extract an audio clip (a single word) from the video and insert at different points/timeline of same video using FFMPEG/libvlcsharp ?

  How can i replace one word (newyork to be replaced by california) throughtout the video where speaker says "Newyork". I want that "Newyork" word to be removed from the audio (while keeping video intact) and insert "california" throughout the video at different places.

  I have an audio file where speaker says "California" which i want to replace with "newyork" word.

  How can i do that using FFMPEG ?

• ffmpeg audio plot wave form

  1er avril 2016, par Haris

  I need to plot wave form of audio as explained here ffmpeg - Can I draw an audio channel as an image ?, I found that some command line option for plotting to image, but my requirement is do from c++ code and draw live waveform on UI. I am able to decode the audio data successfully, but no idea how the data is stored in AVFrame extended_data pointer. The audio can be either stereo or mono.

  AVFrame *frame=av_frame_alloc();
  
  while(av_read_frame(container,&packet)>=0)
  
   {
  
  
  
      int len=avcodec_decode_audio4(ctx,frame,&frameFinished,&packet);
  
      frame->extended_data //how data stored inside the pointer 
  
      ........................
  
  }

• Revision a46f5459c3 : improved speed of 4x4 sse2 fdct. * speed improvment of 30 percent achieved * mu

  3 mars 2014, par Andrew Russell

  Changed Paths :
   Modify /vp9/encoder/x86/vp9_dct_sse2.c

  
  
  improved speed of 4x4 sse2 fdct.

  * speed improvment of 30 percent achieved
  * multiplies and adds remain the same
  * non-arithmetic instructions minimized by hand, by :
  -expanding 2 pass loop
  -removing irrelivant "shuffles"
  -combining last two rounding steps
  * further improvments may be possible

  Change-Id : Idec2c3f52910c48e6a0e0f9aefed5cae31b0b8c0