video_stream_information send

[mark-nick-o]

# video stream
framerate = 30.0                                                          # [Hz] Frame rate.
bitrate = 3000                                                            # [bits/s] Bit rate.
Vflags = 3                                                                 # Bitmap of stream status flags.
Vresolution_h = 300                                                        # [pix] Horizontal resolution.
Vresolution_v = 400                                                        # [pix] Vertical resolution.
rotation = 90                                                             # [deg] Video image rotation clockwise.
hfov = 45                                                                 # [deg] Horizontal Field of view.
stream_id = 2                                                             # Video Stream ID (1 for first, 2 for second, etc.)
count = 4                                                                 # Number of streams available.
stream_type = mavutil.mavlink.VIDEO_STREAM_TYPE_MPEG_TS_H264              # Type of stream.
videoname = "vid_001"
video_uri = "http://10.0.0.56/vids/001.mov"

def mavlink_send_video_stream_information(self, the_connection):
    #if self.mavlink10():
    print("    !!! sending the video stream information   !!! \n")
    try:             
        the_connection.mav.video_stream_information_send(
            self.stream_id, 
            self.count, 
            self.stream_type, 
            self.Vflags, 
            self.framerate, 
            self.Vresolution_h, 
            self.Vresolution_v, 
            self.bitrate, 
            self.rotation, 
            self.hfov, 
            self.videoname, 
            self.video_uri) 
        ret = True
    except Exception as err_msg:
        print("Failed to send video stream information message : %s" % (err_msg))
        ret = False
    return ret

but gets the following error relating to a bytestream ???

[stephendade]

That's a Python2 vs Python 3 issue. I assume you're running Python3?

Python3 strings need to be converted to bytes for MAVLink. See https://github.com/ArduPilot/MAVProxy/blob/master/MAVProxy/modules/mavproxy_asterix.py#L254 for an example.

See https://stackoverflow.com/questions/7585435/best-way-to-convert-string-to-bytes-in-python-3 for the background of the string bytes issue in Python3

[mark-nick-o]

seems to work fine like this function returns good now

def mavlink_send_video_stream_information(self, the_connection):
    print("    !!! sending the video stream information   !!! \n")
    try:
        the_connection.mav.video_stream_information_send(
            self.stream_id,
            self.count,
            self.stream_type,
            self.Vflags,
            self.framerate,
            self.Vresolution_h,
            self.Vresolution_v,
            self.bitrate,
            self.rotation,
            self.hfov,
            #self.videoname,
            (self.videoname).encode('ascii'),
            (self.video_uri).encode('ascii'))
        ret = True
    except Exception as err_msg:
        print("Failed to send video stream information message : %s" % (err_msg))
        ret = False
    return ret

would you expect me to see this in mavlink inspector as i cant see it, the function is returning True now without error when i send it so it suggests all the parameters are good.

[akvsachin]

@stephendade I wanna work on this issue. Please assign this to me and since I'm new to this repo please guide me through.

[rayyanInqline786]

How to recieve this information on the mavlink recieving end?

[rmackay9]

@rayyanInqline786,

If you're using ArduPilot, it doesn't send these messages yet but it's high on the to-do list.

[rayyanInqline786]

@rayyanInqline786,

If you're using ArduPilot, it doesn't send these messages yet but it's high on the to-do list. @rmackay9 I want to send video stream through pymavlink and receive through the pymavlink. How can I do it?

[Ronan0912]

Hello @rmackay9,

Does it mean that ArduPilot will not forward a VIDEO_STREAM_INFORMATION/STATUS MAVLink message? (i.e. from a companion computer implementing a camera protocol to a GCS via an ArduPilot).

Thanks,

[rmackay9]

@Ronan0912,

ArduPilot will forward messages received on the autopilot's serial ports to the GCS unless the SERIALx_OPTION bit has been set to disable forwarding

@rayyanInqline786,

I'm not really a pymavlink expert I'm afraid.

[Ronan0912]

Thanks! All the messages look forwarded to the GCS except those two. I will add debug traces to understand what is happening.

[Ronan0912]

FYI ArduPilot is correctly forwarding the VIDEO_STREAM_INFORMATION. It is the Herelink remote/airunit connected to the ArduPilot that is filtering it (https://discuss.cubepilot.org/t/video-streaming-issue-in-custom-qgc-for-herelink/12858).