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• Merge commit ’94603feb1b3ad01a821a1a1cef1570b13f471821’

  28 octobre 2013, par Michael Niedermayer

  Merge commit ’94603feb1b3ad01a821a1a1cef1570b13f471821’
  * commit ’94603feb1b3ad01a821a1a1cef1570b13f471821’ :
  
    h264_ps : when parsing a VUI fails, only abort when explode is set
  Merge only for metadata, ignoring invalid data can put the context
  
  into an invalid state and can possibly be used for remote code
  
  execution exploits.
  
  Also we support all non standard VUIs that have been reported so
  
  ignoring parsing failure makes no sense for us unless theres
  
  some issue that has not been reported
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/h264_ps.c

• Problems cropping videos with ffmpeg -ss -t

  8 décembre 2016, par Alex Bollbach

  I have been trying to figure out how to precisely crop out sub-sections of a video final.mp4, for example a cropped video with range [0.2, 0.28] or [9.1, 10.2]. So I’ve been using ffmpeg with -ss and -t options. The following command (or some similar form) is what I’ve seen prescribed :

  ffmpeg -y -i final.mp4 -ss 00:00:01 -t 00:00:01.5 -acodec copy -vcodec copy crop1.mp4

  What I expect is a cropped video of length 1.5 starting at time 1.0, but I get a broken video that doesn’t play. Or I’ll try :

  ffmpeg -y -i final.mp4 -ss 1 -c copy -t 1.5 crop1.mp4

  and get a video with the audio cropped to 1.5 seconds but the video lasting much longer freeze framed.

  The point is this should be a relatively straightforward operation but I’m running into problems at every turn. What is wrong with these commands ? My original video is a 7 minute youtube ripped mp4 which I trimmed down to 10 seconds (this seemed to work). But now further finer-grain trimming of that video is showing confusing behavior. Perhaps my video file is somehow in a bad state from the first trimming ?

• Make picture from stream(webcam) by ffmpeg [on hold]

  29 novembre 2018, par SkiF

  I have webcam and I want to store video from it. I need to store just last one hour. Can I limit space or time for ffmpeg out file ?

  Second and the main problem is make pictures every minute. I want make pictures from actual webcam state. with minimal delay.

  Based on my current knowledge I think the best solution is make 3 processes.
  The Fist will capture video for one minute and there will be 60 files with time stamp in name and every minutes ffmpeg will be restarted by script and script remove the oldest file. The Second will share video steam and The Third will take last frame from the newest video file. Maybe some one know better solution for this problem.

  I think bash is the best tool for this problem. Solution is based on c++ or python also welcome.