[FFmpeg-trac] #8492(avformat:new): tee muxer silently overwrites output files

[FFmpeg]

#8492: tee muxer silently overwrites output files
--------------------------------------+----------------------------------
               Reporter:  cehoyos     |                  Owner:
                   Type:  defect      |                 Status:  new
               Priority:  normal      |              Component:  avformat
                Version:  git-master  |               Keywords:  tee
             Blocked By:              |               Blocking:
Reproduced by developer:  0           |  Analyzed by developer:  0
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 As reported on irc, the tee muxer silently overwrites output files:
 {{{
 $ touch out.avi
 }}}
 {{{
 $ ffmpeg -f lavfi -i testsrc2=d=1 -map 0 -vcodec mpeg4 -f tee out.avi
 ffmpeg version N-96456-g39b60359db Copyright (c) 2000-2020 the FFmpeg
 developers
   built with gcc 9 (SUSE Linux)
   configuration: --enable-gpl --enable-gnutls --enable-libx264 --enable-
 libx265 --enable-libaom
   libavutil      56. 38.100 / 56. 38.100
   libavcodec     58. 66.100 / 58. 66.100
   libavformat    58. 35.104 / 58. 35.104
   libavdevice    58.  9.103 / 58.  9.103
   libavfilter     7. 71.100 /  7. 71.100
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 Input #0, lavfi, from 'testsrc2=d=1':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240
 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
 Press [q] to stop, [?] for help
 Output #0, tee, to 'out.avi':
   Metadata:
     encoder         : Lavf58.35.104
     Stream #0:0: Video: mpeg4, yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=2-31,
 200 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc58.66.100 mpeg4
     Side data:
       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
 [Parsed_testsrc2_0] EOF timestamp not reliable
 frame=   25 fps=0.0 q=10.1 Lsize=N/A time=00:00:01.00 bitrate=N/A
 speed=42.2x
 video:82kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/8492>
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