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• How do I buffer and capture an RTSP stream to disk based on a trigger ?

  2 septembre 2022, par SJoshi

  I think what I'm asking about is similar to this ffmpeg post about how to capture a lightning strike (https://trac.ffmpeg.org/wiki/Capture/Lightning).

  


  I have a Raspberry Pi with an IP cam over RTSP, and what I'm wondering is how to maintain a continual 5 second live video buffer, until I trigger a "save" command which will pipe that 5 second buffer to disk, and continue streaming the live video to disk until I turn it off.

  


  Essentially, Pi boots up, this magic black box process starts and is saving live video into a fixed-size, 5-second buffer, and then let's say an hour later - I click a button, and it flushes that 5-second buffer to a file on disk and continues to pipe the video to disk, until I click cancel.

  


  In my environment, I'm able to use ffmpeg, gstreamer, or openRTSP. For each of these, I can connect to my RTSP stream and save it to disk, but I'm not sure how to create this ever-present 5 second cache.

  


  I feel like the gstreamer docs are alluding to it here (https://gstreamer.freedesktop.org/documentation/application-development/advanced/buffering.html?gi-language=c), but I guess I'm just not grokking how the buffering fits in with a triggered save. From that article, I get the impression that the end-time of the video is known in advance (I could artificially limit mine, I guess).

  


  I'm not in a great position to post-process the file, so using something like openRTSP, saving a whole bunch of video segments, and then merging them isn't really an option.

  


  Note : After a successful save, I wouldn't need to save another video for a minute or so, so that 5 second cache has plenty of time to fill back up before the next

  


  This is the closest similar question that I've found : https://video.stackexchange.com/questions/18514/ffmpeg-buffered-recording

  


• how to replace ffmeg's h.264 decoder ?

  26 novembre 2014, par myqiqiang

  Since FFMPEG take too much CPU resource and we can hardware decode in IOS8 ,so i want to replace its decoder with hardwaredecoder.

  but how ? i search in google but get nothing.

  and my thought now is to replace this method with my decoder
  _pCodec = avcodec_find_decoder(m_pCodecCtx->codec_id);

  here is what i want :
  1、if there is a way to replace the h.264 decoder ?
  2、if there exists,then how to do that ?
  3、if there any articles may help me ?

• Resize videos in android

  18 février 2014, par Christopher Johnson

  I'm looking to resize videos captured using the MediaStore Intent after they have been saved to the SD card. I've done similar things with c# and ffmpeg and thought about using that with android but I've yet to be able to find a way to incorporate that into my eclipse running on my windows 7 machine.

  I'm a total *nix noob so all of the solutions that I've found for building ffmpeg into an android app are completely greek to me.

  Is there an alternative solution to ffmpeg that perhaps is already built into the android sdk for resizing videos ?

  I'm just looking for the path of least resistance here...