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• h264 : split reading the ref list modifications and actually building the ref list

  15 avril 2016, par Anton Khirnov

  h264 : split reading the ref list modifications and actually building the ref list
  This will allow postponing the reference list construction (and by
  
  consequence some other functions, like frame_start) until the whole
  
  slice header has been parsed.
  

  • [DBH] libavcodec/h264.h
  • [DBH] libavcodec/h264_refs.c
  • [DBH] libavcodec/h264_slice.c

• configure : When disabling a library disable all the related components

  5 octobre 2015, par Luca Barbato

  configure : When disabling a library disable all the related components
  This way is sufficient to use the component specific configure variable
  
  and not guard against the global library configure variable in code
  
  that is outside it (e.g. checkasm).
  

  • [DBH] configure

• Saving video to SD card while live streaming to YouTube using FFmpeg

  15 mai 2020, par Zohair Ul Hasan

  I'm trying to set up a Raspberry Pi so that it live streams video to YouTube using the Raspberry Pi camera and also saves the video to the SD Card for backup, in case the internet gets disconnected. I used Alex Ellis's guide to set it up, which is basically a docker image that anyone can download and set it up. He sets up the live stream to YouTube but doesn't save the video offline.

  



  So, I tinkered with his code and found that he used FFmpeg to stream to YouTube. The following line is basically the heart of his method to stream :

  



  raspivid -o - -t 0 -w 1920 -h 1080 -fps 40 -b 8000000 -g 40 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i pipe:0 -c:v copy -c:a aac -ab 128k -g 40 -strict experimental -f flv -r 30 rtmp://a.rtmp.youtube.com/live2/$1


  



  I read up about FFmpeg and apparently, to save this stream to my SD card all I need to do is add the directory where I want to save my video to the end of this code. I modified it like so at the end of the line :

  



  raspivid -o - -t 0 -w 1920 -h 1080 -fps 40 -b 8000000 -g 40 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i pipe:0 -c:v copy -c:a aac -ab 128k -g 40 -strict experimental -f flv -r 30 rtmp://a.rtmp.youtube.com/live2/$1 /home/pi/Desktop/my_video.mp4


  



  However, when I ran this, the terminal threw this error :

  



  /home/pi/Desktop/my_video.mp4: No such file or directory


  



  This path, however, definitely exists by default in all Raspberry Pi's. I'm not sure what's wrong here, can someone please help me out ?

  



  P.S : as an additional side question, I read up the documentation on FFmpeg and it specifically says not to use the -re argument when using a live input source, but Alex uses it anyways. Should I substitute it with something different ? It works fine right now though.