[FFmpeg-trac] #7838(avdevice:new): suggest a list_inputs option for the decklink demuxer

[FFmpeg]

#7838: suggest a list_inputs option for the decklink demuxer
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               Reporter:  dericed      |                  Owner:
                   Type:  enhancement  |                 Status:  new
               Priority:  normal       |              Component:  avdevice
                Version:  unspecified  |               Keywords:  decklink
             Blocked By:               |               Blocking:
Reproduced by developer:  0            |  Analyzed by developer:  0
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 Summary of the bug:

 Presently it takes some testing to figure out what inputs are supported by
 any particular decklink device. For instance although analog, analog_rca,
 and analog_xlr are listed as options for -audio_input, the support varies
 per decklink device. Below is an example of looping through the list to
 test each one but I suggest a `ffmpeg -f decklink -list_inputs 1 -i
 "Decklink Device"` would be cleaner.

 How to reproduce:
 {{{
 for i in analog analog_rca analog_xlr embedded aes_ebu ; do echo "===" ;
 echo "$i" ; echo "====" ; /usr/local/opt/ffmpegdecklink/bin/ffmpeg-dl
 -hide_banner -nostdin -f decklink -audio_input "$i" -video_input sdi
 -format_code ntsc -raw_format yuv422p10 -timecode_format vitc -i
 "UltraStudio Express" ; done
 ===
 analog
 ====
 [decklink @ 0x7f8054000e00] Found Decklink mode 720 x 486 with rate
 29.97(i)
 Guessed Channel Layout for Input Stream #0.0 : stereo
 Input #0, decklink, from 'UltraStudio Express':
   Duration: N/A, start: 0.000000, bitrate: 225261 kb/s
     Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
     Stream #0:1: Video: v210 (V210 / 0x30313256), yuv422p10le(bottom
 first), 720x486, 223725 kb/s, 29.97 fps, 29.97 tbr, 1000k tbn, 1000k tbc
 At least one output file must be specified
 ===
 analog_rca
 ====
 [decklink @ 0x7fa916000e00] Device does not support selected audio input.
 [decklink @ 0x7fa916000e00] Could not set input configuration
 UltraStudio Express: Input/output error
 ===
 analog_xlr
 ====
 [decklink @ 0x7fbbc1800e00] Device does not support selected audio input.
 [decklink @ 0x7fbbc1800e00] Could not set input configuration
 UltraStudio Express: Input/output error
 ===
 embedded
 ====
 [decklink @ 0x7f9a41000e00] Found Decklink mode 720 x 486 with rate
 29.97(i)
 Guessed Channel Layout for Input Stream #0.0 : stereo
 Input #0, decklink, from 'UltraStudio Express':
   Duration: N/A, start: 0.000000, bitrate: 225261 kb/s
     Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
     Stream #0:1: Video: v210 (V210 / 0x30313256), yuv422p10le(bottom
 first), 720x486, 223725 kb/s, 29.97 fps, 29.97 tbr, 1000k tbn, 1000k tbc
 At least one output file must be specified
 ===
 aes_ebu
 ====
 [decklink @ 0x7fa2a9000e00] Found Decklink mode 720 x 486 with rate
 29.97(i)
 Guessed Channel Layout for Input Stream #0.0 : stereo
 Input #0, decklink, from 'UltraStudio Express':
   Duration: N/A, start: 0.000000, bitrate: 225261 kb/s
     Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
     Stream #0:1: Video: v210 (V210 / 0x30313256), yuv422p10le(bottom
 first), 720x486, 223725 kb/s, 29.97 fps, 29.97 tbr, 1000k tbn, 1000k tbc
 At least one output file must be specified
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7838>
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