# RTSP Streaming (to QGC on Android) issues on VOXL Mini

Source: https://forum.modalai.com/topic/3290/rtsp-streaming-to-qgc-on-android-issues-on-voxl-mini
Category: VOXL 2 and VOXL 2 Mini (https://forum.modalai.com/category/26/voxl-2-and-voxl-2-mini)
Tags: voxl-2-mini
Posted: 2024-04-03 17:53:03 UTC by AndriiHlyvko
Replies: 7 · Views: 2130

## AndriiHlyvko · 2024-04-03 17:53:03 UTC

Hi, I seem to have issues with streaming rtsp video from voxl mini to QGC on an Android tablet. Initially when I connect from QGC I see the video feed but when I close out QGC and try to open the video stream again I don't see any video. Previously I have been using the same configuration to stream from the VOXL2 and I haven't seen this problem. I tried installing different versions of the voxl-streamer on the mini but it did not help. I am running SDK version 1.1.2 on the Mini. Has anyone seen this problem before?

Thanks.

## Reply by Alex Kushleyev (ModalAI staff) · 2024-04-03 19:56:49 UTC

@AndriiHlyvko , can you please run the voxl-streamer in foreground (you can stop the background service using `systemctl stop voxl-streamer`), run it from command line and see if it outputs any useful information during your QGC connection / disconnection? also, i believe there is a debug mode (`-v 0`) which may give you more information.

## Reply by AndriiHlyvko · 2024-04-03 21:14:32 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev I ran voxl-streamer in verbose mode in two cases: when I got the video and when I didn't. The voxl-streamer output was the same in both cases (only the port was different). I didn't see any errors either. 
anyways here is the output:

```
voxl2-mini:/$ voxl-streamer -v 0
DEBUG:   Using input:     hires_small_encoded
DEBUG:   Using RTSP port: 8900
DEBUG:   Using bitrate:   1000000
DEBUG:   Using decimator: 1
Waiting for pipe hires_small_encoded to appear
Found Pipe
detected following stats from pipe:
w: 1024 h: 768 fps: 15 format: H265
DEBUG:   Frame rate is: 15
DEBUG:   Made rtsp_server
DEBUG:   Created RTSP server main loop context
DEBUG:   Created RTSP server main loop
DEBUG:   Created RTSP server main loop source for callback
DEBUG:   Created timeout loop source for callback
DEBUG:   Got 3 from gst_rtsp_server_attach
Stream available at rtsp://127.0.0.1:8900/live
A new client rtsp://192.168.168.10:52296(null) has connected, total clients: 1
Camera server Connected
DEBUG:   Meta data from incoming frame:
DEBUG:          magic_number 0x564F584C 
DEBUG:          timestamp_ns: 95891853324
DEBUG:          frame_id: -1
DEBUG:          width: 1024
DEBUG:          height: 768
DEBUG:          size_bytes: 77
DEBUG:          stride: 1024
DEBUG:          exposure_ns: 270328
DEBUG:          gain: 54
DEBUG:          format: 4
DEBUG:   Saving h265 SPS
DEBUG:   Creating media pipeline for RTSP client
DEBUG:   Made empty pipeline
DEBUG:   Made test_source
DEBUG:   Made test_caps_filter
DEBUG:   Made overlay_queue
DEBUG:   Made image_overlay
DEBUG:   Made scaler_queue
DEBUG:   Made scaler
DEBUG:   Made converter_queue
DEBUG:   Made video_converter
DEBUG:   Made rotator_queue
DEBUG:   Made video_rotate
DEBUG:   Made video_rotate_filter
DEBUG:   Made app_source
DEBUG:   Made app_source_filter
DEBUG:   Made encoder_queue
DEBUG:   Made omx_encoder
DEBUG:   Made omx_h265_encoder
DEBUG:   Made h264_parser
DEBUG:   Made h265_parser
DEBUG:   Made rtp_filter
DEBUG:   Made rtp_queue
DEBUG:   Made rtp_payload
DEBUG:   Made rtp_h265_payload
VERBOSE: *** Start feeding ***
DEBUG:   SPS accepted
VERBOSE: Frame 1 accepted
VERBOSE: *** Start feeding ***
VERBOSE: Frame 2 accepted
VERBOSE: *** Start feeding ***
```

## Reply by AndriiHlyvko · 2024-04-03 23:05:41 UTC (in reply to Alex Kushleyev)

@Alex-Kushleyev I am pretty confident right now that this issue is not a modalai issue but a QGC issue. I tried using VLC on Android and it works fine every time but whenever I switch into QGC is when I see the problem.

## Reply by Alex Kushleyev (ModalAI staff) · 2024-04-05 02:46:29 UTC (in reply to AndriiHlyvko)

@AndriiHlyvko , hmm.. interesting! I am not sure what to suggest, i don't think we have seen this issue. If the RTSP stream is working via VLC, it *should* also work in QGC.. Both VOXL2 and VOXL2 mini can run the same VOXL2 SDK version (though not exactly the same kernel and a few other things, hence different sdk release files), so essentially the same version of `voxl-camera-server`, `voxl-streamer`, `voxl-px4`, etc.

## Reply by Vinny (ModalAI staff) · 2024-04-05 05:03:29 UTC (in reply to Alex Kushleyev)

@AndriiHlyvko @Alex-Kushleyev 
Are you using USB-C for this connection?
Voxl2 Mini differs from Voxl 2 in that USB-C cable lengths need to be shorter on V2 Mini compared to Voxl 2.
Voxl 2 uses a re-driver IC to boost the signals on USB-C, whereas to keep V2 Mini small, we removed that part.
So, not sure if that is a factor or not, but maybe try using a shorter USB-C cable on V2 Mini.
I have heard of several folks (even internally) that use very long USB-C cables on Voxl 2, then when they try Voxl 2 mini, they forget to use a shorter cable, and some things with USB communications start to fail randomly.

Give it a shot. Not sure if one mode or another for your stream tries to use faster speeds, but that can possibly explain it.

## Reply by AndriiHlyvko · 2024-04-09 19:02:27 UTC (in reply to Vinny)

@Vinny and @Alex-Kushleyev I've narrowed down what the exact problem is. Apparently QGC is not good with H265 video streaming. Once I set the encoding to H264 in voxl-camera config file the video streaming works well. Also FYI I am using microhard radio for the voxl to QGC connection.

## Reply by Alex Kushleyev (ModalAI staff) · 2024-04-10 20:36:47 UTC (in reply to AndriiHlyvko)

@AndriiHlyvko , thank you for following up with your solution!