You need to tell ffmpeg the Declink format you wish to use 1) List the formats available 2) Then use in command
e.g. 1) ffmpeg -f decklink -list_formats 1 -i "UltraStudio Mini Recorder" [decklink @ 0x7fe28080b800] Supported formats for 'UltraStudio Mini Recorder': format_code description ntsc 720x486 at 30000/1001 fps (interlaced, lower field first) nt23 720x486 at 24000/1001 fps pal 720x576 at 25000/1000 fps (interlaced, upper field first) ntsp 720x486 at 60000/1001 fps palp 720x576 at 50000/1000 fps 23ps 1920x1080 at 24000/1001 fps 24ps 1920x1080 at 24000/1000 fps Hp25 1920x1080 at 25000/1000 fps Hp29 1920x1080 at 30000/1001 fps Hp30 1920x1080 at 30000/1000 fps Hi50 1920x1080 at 25000/1000 fps (interlaced, upper field first) Hi59 1920x1080 at 30000/1001 fps (interlaced, upper field first) Hi60 1920x1080 at 30000/1000 fps (interlaced, upper field first) hp50 1280x720 at 50000/1000 fps hp59 1280x720 at 60000/1001 fps hp60 1280x720 at 60000/1000 fps (And then some examples of usage) https://ffmpeg.org/ffmpeg-devices.html#Examples-1 e.g. 2) ffmpeg -format_code Hi59 -f decklink -i "UltraStudio Mini Recorder" -preset superfast -crf 18 -minrate 8M -maxrate 8M -bufsize 10M -acodec libfdk_aac -vcodec libx264 -r 30 -f flv rtmp://xxxxx.com Hope that helps Regards, Paul On 14 Jul 2020, at 02:28, Simon Roberts <[email protected]> wrote: > > Hi all, > > I've been working with a Decklink Quad HDMI card under Ubuntu 20.04. The > kernel driver is loaded and the Blackmagic software "mediaexpress" displays > the input signal perfectly. However, when I try to use ffplay, it seems > like it knows which of the four channels on the card has a signal, because > it drops out with "can't determine format" on the other three, but when I > ask to view the valid input signal, I simply get color bars. > > I just built this version of ffmpeg with the decklink support, and it ran > without any evident errors. I've done this before on another machine that > didn't have a strong enough CPU for the concurrent capture I want to do, > and everything worked properly. > > So, my question is, what possible causes of color bars are there? I know > that one is "if the input signal is lost", but it's claiming that it has a > signal and it correctly identifies it as 1080 60p. I'm wondering if the > bars are from the Decklink drivers, and not actually anything to do with > ffmpeg/ffplay. How could I determine that? > > This is the log output: > > $ ffplay -f decklink -i 'DeckLink Quad HDMI Recorder (1)' > ffplay version N-98470-g7772666 Copyright (c) 2003-2020 the FFmpeg > developers > built with gcc 9 (Ubuntu 9.3.0-10ubuntu2) > configuration: --prefix=/home/simon/ffmpeg_build > --pkg-config-flags=--static > --extra-cflags='-I/home/simon/ffmpeg_build/include > -I/home/simon/ffmpeg_sources/BMD_SDK/include' > --extra-ldflags=-L/home/simon/ffmpeg_build/lib --extra-libs='-lpthread -lm' > --bindir=/home/simon/bin --enable-gpl --enable-libass --enable-libfdk-aac > --enable-libfreetype --enable-libmp3lame --enable-libopus > --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 > --enable-nonfree --enable-decklink > libavutil 56. 55.100 / 56. 55.100 > libavcodec 58. 95.100 / 58. 95.100 > libavformat 58. 48.100 / 58. 48.100 > libavdevice 58. 11.101 / 58. 11.101 > libavfilter 7. 87.100 / 7. 87.100 > libswscale 5. 8.100 / 5. 8.100 > libswresample 3. 8.100 / 3. 8.100 > libpostproc 55. 8.100 / 55. 8.100 > [decklink @ 0x7fb628000bc0] Autodetected the input mode 0B f=0/0 > [decklink @ 0x7fb628000bc0] Found Decklink mode 1920 x 1080 with rate 59.94 > [decklink @ 0x7fb628000bc0] Frame received (#1) - No input signal detected > - Frames dropped 1 > Input #0, decklink, from 'DeckLink Quad HDMI Recorder (1)': f=0/0 > Duration: N/A, start: 0.000000, bitrate: 1990203 kb/s > Stream #0:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s > Stream #0:1: Video: rawvideo (UYVY / 0x59565955), uyvy422(progressive), > 1920x1080, 1988667 kb/s, 59.94 tbr, 1000k tbn, 1000k tbc > 1.23 A-V: -1.453 fd= 62 aq= 261KB vq=16200KB sq= 0B f=0/0 > > Thanks for any help! > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
