[FFmpeg-user] Parse environment variables in command line

[Denis Mysenko]

 Hi there

This is not really related to FFmpeg, and I'm afraid there is no quick solution.

If you use environment variable (like you proposed) or any shell/UNIX 'hack' (eg. -i `cat url.txt`), at the moment of execution a plain-text password will be inserted anyway. And 'ps' will show what really was launched, not the string before parsing.

So the question becomes – can you pass incomplete information to FFmpeg at the execution time, and then make it fetch extra information itself? I don't think it's possible.


Воскресенье, 19 апреля 2015, 8:03 +05:00 от Ilya Melnikov <rayanayar at mail.ru>:
>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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>ffmpeg-user at ffmpeg.org
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Sincerely,
-- 
Denis Mysenko, CCNA, MCP, MCSA
Skype: denismysenko, ICQ: 555955 
Forskarbacken 9 / 209
10405 Stockholm, Sweden

Mobile: +46 (0) 70 405 49 04