Newest 'ffmpeg' Questions - Stack Overflow

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• Get Stream and save as jpeg file from IP Camera using ffmpeg

  10 novembre 2011, par mekici

  How i can get stream from Ip Camera, Its using RTP, stream is MPEG4, i have multicast address and port,and i have ip camera's IP address and Port Number. And I cant reach via http forexample (http://ip/jpeg) And I cant reach stream with VLC Player too. forexample (rtp://ipadressofcam:port) and (rtp://multicastaddress:port)
  So What is ffmpeg command of that?
  I have windows OS, I only write code with C#, I dont know, c or c++.
  But producer created their own ocx which used for viewing cam,that plugin can work on .net but i dont want to use it becouse it doesnt have much funcionality, I mean you cant get current picture or snapshot of cams, thats why i have to do it myself i already asked before in that link
  Thanks

• Windows console - BAT compatibility

  10 novembre 2011, par Michael

  I have a command line statement which works perfectly when manually typing it into the console, however, when I put it in a bat file it doesn't work.

  for %f in (*.flac) do ffmpeg -i "%f" -acodec alac "%~nf.m4a"
  

  Here is the error message when I try running the bat file

  The following usage of the path operator in batch-parameter
  substitution is invalid: %~nf.m4a"
  

  Is there any way to fix this? The statement converts flac files to alac files using the program ffmpeg.

• Extract RGB values from a AVFrame (FFMPEG) in C++

  9 novembre 2011, par Extrakun

  I am currently trying to read in video frames by using FFMPEG. The format is PIX_FMT_RGB24; For each frame, the RGB values are all combined together in frame->data[0] (Where frame is of the type AVFrame).

  How do I extract the individual R, G and B values for each frame? This is for processing the video. I would think it would work the same way as extracting the RGB values from a bitmap too. Thanks!

• Access each Pixel of AVFrame

  9 novembre 2011, par EBAG

  I need to access each pixel informations of an AVFrame object of FFMPEG ( If it's in RGB then each color, R and G and B of each Pixel )

  How can I achieve that?

• Transcoding to webm with ffmpeg audio problems

  9 novembre 2011, par Max A.

  For the past few days, I have been trying to get my lossless .mov video(that has an audio track) to a .webm format.

  Some info on the video & audio is that the fps is 30. Also the audio track has about 3-5 seconds of silence/blank audio before you start hearing some music.

  My problem is that is seems during the transcoding to webm, it strips away this blank audio because when I go to play the video, the audio starts right away.I've also notice that it jumps right away to ~4 seconds in the video. When i play it on the browser, it jumps to that moment in the timeline. If I try to scrub to the beginning, the video ends.

  I've have figured somethings out.

  1. This is just a webm problem. This does not happen with ogv or mp4
  2. It only happens if they is blank audio in the beginning of the audio track.

  I am using ffmpeg with the libvpx and libvorbis librarys and I am doing just the basic command line setup

  ffmpeg -i "infile" "outfile.webm"