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Since commit c25567fe, if "hardware acceleration" is enabled, the video on the Lenovo P51 Ubuntu 19.04 is not sent.

[sdp @ 0x7ff14c1c0200] Stream #0: not enough frames to estimate rate; consider increasing probesize
[mjpeg @ 0x7ff1340a0c00] unable to decode APP fields: Invalid data found when processing input
[1565900238.308|11497|accel.cpp         :269  ] Attempting to use hardware decoder mjpeg with vaapi
[1565900238.308|11497|media_decoder.cpp :311  ] Decoding video using MJPEG (Motion JPEG) (mjpeg)
[1565900238.308|11497|video_input.cpp   :375  ] created decoder with video params : size=1280X720, fps=30.000000
[1565900238.308|11497|sinkclient.cpp    :415  ] Start sink <local / Jami Daemon_shm_11070_0>, size=1280x720, mixer=0
[mjpeg @ 0x7ff134099e40] unable to decode APP fields: Invalid data found when processing input
[1565900238.309|11497|accel.cpp         :51   ] Found compatible hardware format for mjpeg decoder with vaapi
[mjpeg @ 0x7ff134099e40] No support for codec mjpeg profile 192.
[mjpeg @ 0x7ff134099e40] Failed setup for format vaapi_vld: hwaccel initialisation returned error.
[1565900238.309|11497|accel.cpp         :58   ] Not using hardware decoding
[1565900238.309|11499|accel.cpp         :269  ] Attempting to use hardware decoder h264 with vaapi
[1565900238.309|11499|media_decoder.cpp :311  ] Decoding video using H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (h264)
[1565900238.310|11499|sinkclient.cpp    :195  ] ShmHolder[Jami Daemon_shm_11070_1]: new sizes: f=0, a=103
[1565900238.310|11499|sinkclient.cpp    :161  ] ShmHolder: new holder 'Jami Daemon_shm_11070_1'
[1565900238.310|11499|sinkclient.cpp    :415  ] Start sink <5818368387659495 / Jami Daemon_shm_11070_1>, size=1280x720, mixer=0
[1565900238.310|11503|accel.cpp         :51   ] Found compatible hardware format for h264 decoder with vaapi
[h264 @ 0x7ff14c35bcc0] No support for codec h264 profile 578.
[h264 @ 0x7ff14c35bcc0] Failed setup for format vaapi_vld: hwaccel initialisation returned error.
[1565900238.310|11503|accel.cpp         :58   ] Not using hardware decoding
[1565900238.313|11499|sinkclient.cpp    :195  ] ShmHolder[Jami Daemon_shm_11070_1]: new sizes: f=3686400, a=7372903
[1565900238.320|11497|accel.cpp         :299  ] Attempting to use hardware encoder h264_vaapi with vaapi
[1565900238.320|11497|media_encoder.cpp :497  ] [h264_vaapi] Using 8 threads
[1565900238.320|11497|media_encoder.cpp :604  ] Using profile Constrained Baseline (242) and level 41
[1565900238.320|11497|media_encoder.cpp :552  ] Failed to set x264 preset 'ultrafast'
[1565900238.320|11497|media_encoder.cpp :555  ] Failed to set x264 tune 'zerolatency'
[1565900238.320|11497|media_encoder.cpp :761  ] H264 encoder setup: crf=30, maxrate=1200000, bufsize=2400000
[h264_vaapi @ 0x7ff134370380] No usable encoding profile found.
[1565900238.320|11497|threadloop.cpp    :46   ] [threadloop:0x7ff1b8012868] Unwaited exception: Could not open encoder

Works if I add (accel.cpp:initDevice():)

if (av_hwdevice_ctx_create(&deviceCtx_, hwType_, "/dev/dri/renderD128", nullptr, 0) >= 0)
    return true;