Hello, first of all, I apologize if this is a repost, but I haven’t been able to find a similar problem mentioned here. The issue is related to the firmware for the ANAFI 4K drone, as it doesn’t occur with ANAFI AI firmware.
The problem occurs when I run any streaming code, whether it’s custom code (i.e., flying around with keyboard input while trying to view the drone camera perspective) or the steaming example from Github and Olympe documentation.
The main issue is that the stream stops due to this error, though it recovers after a while and everything works as expected.
This error only occurs once during takeoff, specifically when I restart the simulation or stop and rerun (fresh start of UE4 app and firmware). It’s worth mentioning that if this happens once and then the drone lands, taking off again doesn’t trigger the error. However, even if the streaming stops, the drone in the simulator can execute the commands without a problem just the visualization doesn’t work for a while. Here’s the error in question, which repeats in the output until it stops for some reason (from what I’ve observed, it stops after a few movement commands, though the number of commands isn’t deterministic):
2025-02-10 22:16:36,560 [ERROR] ulog - vdec_core - vdec_default_input_filter_internal:254: non-strictly-monotonic timestamp (20862186667 <= 20870086667) err=71(Protocol error)
2025-02-10 22:16:36,560 [ERROR] ulog - pdraw_sink - onCodedVideoChannelQueue:396: mbuf_coded_video_frame_queue_push err=71(Protocol error)
The firmware command I’m using:
sphinx "/opt/parrot-sphinx/usr/share/sphinx/drones/anafi.drone"::firmware="https://firmware.parrot.com/Versions/anafi/pc/%23latest/images/anafi-pc.ext2.zip"
The same errors occur when I use a local version of the firmware such as:
sphinx "/opt/parrot-sphinx/usr/share/sphinx/drones/anafi.drone"::firmware="$HOME/sphinx/images/anafi-pc.ext2.zip"
The problem occurs on every UE4 environment, either custom or prebuilt and on multiple PCs and laptops (all of them use the supported operating system). On the real drone there are no problems. I’ve tried to add a small delay between drone initialization and starting the video stream.
Is there any workaround besides using ANAFI AI?