[FFmpeg-user] Parse environment variables in command line

[Ilya Melnikov]

Hello.

ffmpeg records video stream from IP-cam.
IP-cam has authentiation.

ffmpeg \
  -t $DT_SECONDS_TO_RECORD \
  -i rtsp://$SRC_USER:$SRC_PASS@$SRC_ADDR/stream1.sdp  \
  -vcodec copy \
  -acodec copy \
  $DST_FILE

ffmpeg starts from cron script by unpriviledged user.
At the same host can be logged interactive users.

The problem is: interactive users can see ffmpeg command line "by ps", thus users can see IP-cam password.

$ ps -f -C ffmpeg
UID        PID  PPID  C STIME TTY          TIME CMD
backup    1506  1423 88 07:47 pts/11   00:00:08 ffmpeg -t 3600 -i rtsp://admin:password@192.168.0.100/stream1.sdp -vcodec copy -acodec copy out.mkv

The question is: can ffmpeg parse environment variables themselves?
For example:

ffmpeg \
  -t $DT_SECONDS_TO_RECORD \
  -i rtsp://$SRC_USER:'$SRC_PASS'@$SRC_ADDR/stream1.sdp  \
  -vcodec copy \
  -acodec copy \
  $DST_FILE

$ ps -f -C ffmpeg
UID        PID  PPID  C STIME TTY          TIME CMD
backup    1506  1423 88 07:47 pts/11   00:00:08 ffmpeg -t 3600 -i rtsp://admin:$SRC_PASS@192.168.0.100/stream1.sdp -vcodec copy -acodec copy out.mkv



--
Ilya Melnikov
Sunday 19 April 2015 07:35:46
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