Opened 2 years ago

Last modified 2 years ago

#5933 open defect

Some unused output options do not trigger a warning

Reported by: KarolGT Owned by:
Priority: minor Component: undetermined
Version: git-master Keywords:
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no


rtsp_transport tcp is ignored when this parameter is not right after ffmpeg command
How to reproduce:

ffmpeg is ignoried in below case:

ffmpeg -i rtsp:// -c:v copy -rtsp_transport tcp -an out.mkv 

below case is working fine, as expected:

ffmpeg -rtsp_transport tcp -i rtsp:// -c:v copy -an out.mkv

ffmpeg version: tested on 3.1.x and 3.2.x (latest from Nov 08 2016)
built on Linux (Ubuntu)

It will be good to have this information at least in the documentation. It is possible to find this information on some forums like but I didn't find any information about this on

Change History (1)

comment:1 Changed 2 years ago by cehoyos

  • Keywords rtsp_transport removed
  • Priority changed from normal to minor
  • Reproduced by developer set
  • Status changed from new to open
  • Summary changed from rtsp_transport tcp is ignored to Some unused output options do not trigger a warning
  • Version changed from unspecified to git-master

Maybe the following command line helps you understanding the issue - option placement does matter - better:

$ ffmpeg -rtsp_transport udp -i rtsp:// -rtsp_transport tcp rtsp://

Iiuc, unused format and protocol options - contrary to encoder options - do not trigger a warning.

$ ffmpeg -i fate-suite/lena.pnm -rtsp_transport tcp -user_agent foo -key bar -write_id3v2 1 -f null -
ffmpeg version N-82235-g222f59a Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl --enable-gnutls
  libavutil      55. 35.100 / 55. 35.100
  libavcodec     57. 66.101 / 57. 66.101
  libavformat    57. 57.100 / 57. 57.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 66.100 /  6. 66.100
  libswscale      4.  3.100 /  4.  3.100
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, ppm_pipe, from 'fate-suite/lena.pnm':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: ppm, rgb24, 256x256, 25 tbr, 25 tbn, 25 tbc
Output #0, null, to 'pipe:':
    encoder         : Lavf57.57.100
    Stream #0:0: Video: wrapped_avframe, rgb24, 256x256, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
      encoder         : Lavc57.66.101 wrapped_avframe
Stream mapping:
  Stream #0:0 -> #0:0 (ppm (native) -> wrapped_avframe (native))
Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed= 165x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
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