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• Using inotifywait with a FIFO

  2 mai 2019, par diatrevolo

  I am using inotifywait to watch a folder and run a video transcode when a file is done copying or moved into a share folder from within an Ubuntu Docker container. It seems to work, but occasionally it stops responding and seems to ignore files from that point on. Seeing as this is my first time using mkfifo, and inotifywait, from the script below, is there anything that looks odd that someone could point out ? Thanks !

  #!/bin/bash
  
  mkfifo video_pipe
  
  
  
  inotifywait -m /media/transcode_inbox -e close_write -e moved_to | while read path action file
  
  do
  
    echo "$file" >> video_pipe
  
  done &
  
  
  
  while read file 
  
  do
  
      mv /media/$file /media/originals/
  
      ffmpeg -nostdin -i /media/originals/$file -c:v hap -format hap_q media/hap_q/$file &
  
  done < video_pipe

• Setting up a video standard (PAL, NTSC) in ffmpeg, ffplay

  5 mars 2015, par grzebyk

  I have a PAL camera and a stk1160 based video grabber, which is correctly recognised as a /dev/videoN under linux. I am able to watch the feed with vlc after setting up the video standard as a PAL (see the image).

  

  For the purpose of my project I am forced to use ffmpeg. In the default configuration ffmpeg seems to use NTSC standard - image is in greyscale and is flickering (see below image). How can I set the PAL video standard in ffmpeg ?

  

• No Audio when streaming to Youtube from ffmpeg

  11 février 2019, par Sindre Svendby

  So I’m not able to get sound to youtube when streaming with ffmpeg.

  The command I try to run ;

  ffmpeg \
  
   -f v4l2 \
  
   -vcodec h264 \
  
   -video_size 864x480 \
  
   -r 24 \
  
   -i /dev/video1 \
  
   -f alsa \
  
   -thread_queue_size 1024 \
  
   -ac 2 \
  
   -i plughw:CARD=C920,DEV=0 \
  
   -c:a aac \
  
   -filter:a "volume=1.5" \
  
   -b:a 128k \
  
   -ar 44100 \
  
   -vcodec copy \
  
   -b:v 2000k  \
  
   -r 24 \
  
   -g 48 \
  
   -x264opts no-scenecut \
  
   -bufsize 4096k \
  
   -maxrate 2048k \
  
   -f flv \
  
   rtmp://a.rtmp.youtube.com/live2/STREAM_KODE

  if I switch out the rmtp stream, with a file, like test.flv.
  And then I try to watch this with VLC I do get sound.

  If I check the audio codec in VLC I do see that the codec is aac.
  And as far as I can see from their help pages it is aac that is the correct audio codec to send in.

  I’m not sure how to continue debug this issue, and ideas on this would be great.