Blackmagic Forum

Hello,

I need to playback files to a DeckLink card using FFmpeg on Ubuntu 22.04 and 24.04. For testing I'm using this file: https://download.blender.org/peach/bigb ... p_h264.mov

The file plays nicely using ffplay:

Code: Select all

ffplay -i $FILE

I can also play it on my DeckLink card using Gstreamer:

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gst-launch-1.0 \
  filesrc location="$FILE" ! tee ! queue ! \
  decodebin ! queue ! \
  videoscale ! videoconvert ! videorate ! \
  decklinkvideosink mode=1080p24 device-number=2

However when using FFmpeg:

Code: Select all

ffmpeg \
    -re -i "$FILE" \
    -filter:v scale=1920:1080 -filter:v fps=24 \
    -an \
    -f decklink -format_code Hp24 -pix_fmt uyvy422 'DeckLink Quad (3)'

Then playback works during ~1.5s but fps drops and it quickly freezes. CPU load is low.

Code: Select all

ffmpeg version 7.1 Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --extra-cflags='-I/home/user/softwares/ffmpeg/ffmpeg-7.1/ffmpeg-7.1/include -I/usr/local/cuda/include -I/home/user/sdks/blackmagic/Blackmagic-DeckLink-SDK-14.2/Linux/include/' --extra-ldflags='-L/home/user/softwares/ffmpeg/ffmpeg-7.1/ffmpeg-7.1/lib -L/usr/local/cuda/lib64 -L/home/user/sdks/blackmagic/Blackmagic-DeckLink-SDK-14.2/Linux/include/' --prefix=/opt/ffmpeg/ffmpeg-7.1 --bindir=/opt/ffmpeg/ffmpeg-7.1/bin --pkg-config-flags=--static --extra-libs='-lpthread -lm' --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx265 --enable-nonfree --enable-nonfree --enable-decklink --enable-ffplay
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.100 / 61. 19.100
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videos/big_buck_bunny_1080p_h264.mov':
  Metadata:
    major_brand     : qt 
    minor_version   : 537199360
    compatible_brands: qt 
    creation_time   : 2008-05-27T18:40:35.000000Z
    com.apple.quicktime.player.movie.audio.gain: 1.000000
    com.apple.quicktime.player.movie.audio.treble: 0.000000
    com.apple.quicktime.player.movie.audio.bass: 0.000000
    com.apple.quicktime.player.movie.audio.balance: 0.000000
    com.apple.quicktime.player.movie.audio.pitchshift: 0.000000
    com.apple.quicktime.player.movie.audio.mute:
    com.apple.quicktime.player.movie.visual.brightness: 0.000000
    com.apple.quicktime.player.movie.visual.color: 1.000000
    com.apple.quicktime.player.movie.visual.tint: 0.000000
    com.apple.quicktime.player.movie.visual.contrast: 1.000000
    com.apple.quicktime.player.version: 7.4.1 (14)
    com.apple.quicktime.version: 7.4.1 (14) 0x7418000 (Mac OS X, 10.5.2, 9C31)
    timecode        : 00:00:00:00
  Duration: 00:09:56.46, start: 0.000000, bitrate: 9725 kb/s
  Stream #0:0[0x1](eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 9282 kb/s, 24 fps, 24 tbr, 2400 tbn (default)
      Metadata:
        creation_time   : 2008-05-27T18:40:35.000000Z
        handler_name    : Apple Video Media Handler
        vendor_id       : appl
        encoder         : H.264
      Side data:
        displaymatrix: rotation of -0.00 degrees
  Stream #0:1[0x2](eng): Data: none (tmcd / 0x64636D74) (default)
      Metadata:
        creation_time   : 2008-05-27T18:40:35.000000Z
        handler_name    : Time Code Media Handler
        timecode        : 00:00:00:00
  Stream #0:2[0x3](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 437 kb/s (default)
      Metadata:
        creation_time   : 2008-05-27T18:40:35.000000Z
        handler_name    : Apple Sound Media Handler
        vendor_id       : [0][0][0][0]
[vost#0:0/wrapped_avframe @ 0x651ff00f3bc0] Multiple -filter/-af/-vf options specified for stream 0, only the last option '-filter:v fps=24' will be used.
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> wrapped_avframe (native))
Press [q] to stop, [?] for help
[decklink @ 0x651feffc5cc0] Found Decklink mode 1920 x 1080 with rate 24.00
Output #0, decklink, to 'DeckLink Quad (3)':
  Metadata:
    major_brand     : qt 
    minor_version   : 537199360
    compatible_brands: qt 
    timecode        : 00:00:00:00
    com.apple.quicktime.player.movie.audio.gain: 1.000000
    com.apple.quicktime.player.movie.audio.treble: 0.000000
    com.apple.quicktime.player.movie.audio.bass: 0.000000
    com.apple.quicktime.player.movie.audio.balance: 0.000000
    com.apple.quicktime.player.movie.audio.pitchshift: 0.000000
    com.apple.quicktime.player.movie.audio.mute:
    com.apple.quicktime.player.movie.visual.brightness: 0.000000
    com.apple.quicktime.player.movie.visual.color: 1.000000
    com.apple.quicktime.player.movie.visual.tint: 0.000000
    com.apple.quicktime.player.movie.visual.contrast: 1.000000
    com.apple.quicktime.player.version: 7.4.1 (14)
    com.apple.quicktime.version: 7.4.1 (14) 0x7418000 (Mac OS X, 10.5.2, 9C31)
    encoder         : Lavf61.7.100
  Stream #0:0(eng): Video: wrapped_avframe, uyvy422(tv, bt709, progressive), 1920x1080, q=2-31, 200 kb/s, 24 fps, 24 tbn (default)
      Metadata:
        creation_time   : 2008-05-27T18:40:35.000000Z
        handler_name    : Apple Video Media Handler
        vendor_id       : appl
        encoder         : Lavc61.19.100 wrapped_avframe
frame=   25 fps=0.3 q=-0.0 size=N/A time=00:00:01.37 bitrate=N/A speed=0.0146x

I got the same behavior when using:

• another card (a DeckLink 8K Pro)
• an older FFmpeg version (4.4.3)
• an older DeckLink SDK version (12.7)
• other files
• an RTSP stream
• a webcam

Is it working for anyone on Ubuntu?

What version of the decklink driver do you have installed?

As you can see in viewtopic.php?f=12&t=213331, the driver breaks backwards compatibility in 14.3, even when compiling against older versions of the SDK

I've tried 12.4.2, 12.7, 14.2 & 14.3. Got the same behavior with the 3 first ones, and FFmpeg is not yet compatible with the later and does not compile.

FFmpeg + DeckLink status:

1. Output under Driver >13.3 = broken. Cause: IDeckLinkVideoFrame::QueryInterface unhandled. IDeckLinkOutputVideoCallback driver code access it.
2. Input under Driver > 13.3 = NC (I dont own a card with input support)
3. Compiling under SDK > 13.3 = broken. Causes: Changes on the api, notably IDeckLinkMemoryAllocator has been reworked and also IDeckLinkVideoFrame

Mitigation:

1. Downgrade interfaces to SDK compatible legacy version using _v14_2_1 suffix
2. Implement QueryInterface on implemented classes

Patch: https://patch-diff.githubusercontent.co ... ll/1.patch
https://github.com/pabloko/FFmpeg/pull/1/files

Hi Paloko,
Thank you very much, I'll give it a try in a couple of weeks.

Happy New Year to all

I found this thread after extensively Googling and pulling my hairs out. I had similar issues:

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C:\Apps\ffmpeg>ffmpeg -re -i rtmp://127.0.0.1/feed-main-realtime/live -f decklink -pix_fmt uyvy422 -s 1920x1080 -r 60000/1000 -c:a pcm_s16le -ar 48000 -ac 2 -format_code Hp60 -c:v v210 "DeckLink Duo (2)"

Giving me:

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ffmpeg version n7.1-ffmpeg-windows-build-helpers Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 10.2.0 (GCC)
  configuration: --pkg-config=pkg-config --pkg-config-flags=--static --extra-version=ffmpeg-windows-build-helpers --enable-version3 --disable-debug --disable-w32threads --arch=x86_64 --target-os=mingw32 --cross-prefix=/home/runner/work/ffmpeg-stable-autobuild/ffmpeg-stable-autobuild/sandbox/cross_compilers/mingw-w64-x86_64/bin/x86_64-w64-mingw32- --enable-libcaca --enable-gray --enable-libtesseract --enable-fontconfig --enable-gmp --enable-libass --enable-libbluray --enable-libbs2b --enable-libflite --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libvorbis --enable-libwebp --enable-libzimg --enable-libzvbi --enable-libmysofa --enable-libopenjpeg --enable-libopenh264 --enable-libvmaf --enable-libsrt --enable-libxml2 --enable-opengl --enable-libdav1d --enable-gnutls --enable-libsvtav1 --enable-libvpx --enable-libaom --enable-nvenc --enable-nvdec --extra-libs=-lz --extra-libs=-lpng --extra-libs=-lm --extra-libs=-lfreetype --extra-libs=-lshlwapi --extra-libs=-lmpg123 --extra-libs=-lpthread --extra-cflags=-DLIBTWOLAME_STATIC --extra-cflags=-DMODPLUG_STATIC --extra-cflags=-DCACA_STATIC --enable-amf --enable-libmfx --enable-libaribcaption --enable-gpl --enable-frei0r --enable-librubberband --enable-libvidstab --enable-libx264 --enable-libx265 --enable-avisynth --enable-libaribb24 --enable-libxvid --enable-libdavs2 --enable-libxavs2 --enable-libxavs --extra-cflags='-mtune=generic' --extra-cflags=-O3 --enable-static --disable-shared --prefix=/home/runner/work/ffmpeg-stable-autobuild/ffmpeg-stable-autobuild/sandbox/cross_compilers/mingw-w64-x86_64/x86_64-w64-mingw32 --enable-nonfree --enable-libfdk-aac --enable-decklink
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.100 / 61. 19.100
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Input #0, flv, from 'rtmp://127.0.0.1/feed-main-realtime/live':
  Metadata:
    |RtmpSampleAccess: true
    Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
    displayWidth    : 1920
    displayHeight   : 1080
    fps             : 60
    profile         :
    level           :
  Duration: 00:00:00.00, start: 904.929000, bitrate: N/A
  Stream #0:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 163 kb/s
  Stream #0:1: Video: h264 (Main), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 15360 kb/s, 60 fps, 60 tbr, 1k tbn
Incompatible pixel format 'uyvy422' for codec 'v210', auto-selecting format 'yuv422p'
Stream mapping:
  Stream #0:1 -> #0:0 (h264 (native) -> v210 (native))
  Stream #0:0 -> #0:1 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
[decklink @ 00000200483d1c80] Found Decklink mode 1920 x 1080 with rate 60.00
Output #0, decklink, to 'DeckLink Duo (2)':
  Metadata:
    |RtmpSampleAccess: true
    Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
    displayWidth    : 1920
    displayHeight   : 1080
    fps             : 60
    profile         :
    level           :
    encoder         : Lavf61.7.100
  Stream #0:0: Video: v210, yuv422p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 2654208 kb/s, 60 fps, 60 tbn
      Metadata:
        encoder         : Lavc61.19.100 v210
  Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
      Metadata:
        encoder         : Lavc61.19.100 pcm_s16le
frame=   61 fps= 13 q=-0.0 size=N/A time=00:00:01.10 bitrate=N/A dup=66 drop=0 speed=0.237x


I was using https://github.com/AnimMouse/ffmpeg-sta ... d/releases release of ffmpeg with the latest BlackMagic Desktop Video 14.4.1. After uninstalling the BM software and installing Desktop Video 12.9, it properly worked again. I hope more people find this through Google

@pabloko: I see that you made a patch that supposedly fixes this. I'm unable to compile ffmpeg so I cannot verify that the patch works. Is there however any other way I can contribute to getting your changes into mainstream ffmpeg?

E.g. if you have a build I can run, test/validate or something similar? Is the PR now stuck on the mailing list or any other action required to get it approved for merging?