#7882 closed defect (invalid)
Decklink 4k Extreme output "not enough buffered video frames"
Reported by: | Markus Kienast | Owned by: | |
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Priority: | normal | Component: | avdevice |
Version: | unspecified | Keywords: | decklink |
Cc: | Marton Balint | Blocked By: | |
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Summary of the bug:
Sending video out "Decklink 4k Extreme" SDI/HDMI video card does not work properly, produces the following error repeatedly:
[decklink @ 0xf0b200] There are not enough buffered video frames. Video may misbehave!
How to reproduce:
Ubuntu 18.04,
kernel 4.15.0-48-lowlatency,
Blackmagic Desktopvideo 11.1,
FFmpeg snapshot git commit fcc01ba,
Blackmagic Decklink SDK 11.1
FFmpeg was compiled and run as a Docker image based on jrottenberg/ffmpeg ubuntu build. The modified Docker source is here: https://github.com/flaneurtv/ffmpeg
The Docker image is publicly available for testing: https://cloud.docker.com/u/flaneurtv/repository/docker/flaneurtv/ffmpeg
The tags used for testing this were:
4.1-sdk-10.11.4
snapshot-sdk-11.1
Install the respective Decklink SDK on your host system, then run:
docker run -it --device=/dev/blackmagic:/dev/blackmagic -v /srv/assets:/srv/assets -v /etc/blackmagic/BlackmagicPreferences.xml:/etc/blackmagic/BlackmagicPreferences.xml flaneurtv/ffmpeg:snapshot-sdk-11.1 -f lavfi -i testsrc2=size=3840x2160:rate=25 -f decklink -pix_fmt uyvy422 'DeckLink 4K Extreme'
The problem is the same, when using flaneurtv/ffmpeg:4.1-sdk-10.11.4 and the respective drivers on the host system.
Running ffmpeg with decklink in Docker is known to work. I am using this setup for years now, so this most certainly can be ruled out as the source of the problem.
Attachments (1)
Change History (4)
by , 5 years ago
Attachment: | ffmpeg-snapshot-sdk-11.1.txt added |
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comment:1 by , 5 years ago
This just usually means that yout system is too slow to be able to produce frames realtime and convert them to uyvy422. Try using -sws_flags fast_bilinear.
comment:2 by , 5 years ago
Resolution: | → invalid |
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Status: | new → closed |
comment:3 by , 5 years ago
Keywords: | 4k removed |
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