Problem re-encoding Webcam stream?

[ecations]

I saw in another issue that you recommended the following code for re-encoding a webcam stream;

paths:
  cam:
    runOnInit: ffmpeg -f dshow -i video="Jabra PanaCast" -f rtsp rtsp://localhost:$RTSP_PORT/$RTSP_PATH
    runOnInitRestart: yes
    runOnPublish: ffmpeg -i rtsp://localhost:$RTSP_PORT/$RTSP_PATH -c:v libx264 -preset ultrafast -b:v 500k -max_muxing_queue_size 1024 -filter:v fps=fps=20 -f rtsp rtsp://localhost:$RTSP_PORT/newfps
    runOnPublishRestart: yes

However this produces the following (repeating) error when I try it:

2020/12/09 23:08:57 [2/1/0] [client [::1]:8699] connected
2020/12/09 23:08:57 [2/1/0] [client [::1]:8699] OPTIONS
2020/12/09 23:08:57 [2/1/0] [client [::1]:8699] DESCRIBE
2020/12/09 23:08:57 [2/1/0] [client [::1]:8699] SETUP
2020/12/09 23:08:57 [2/1/0] [client [::1]:8699] PLAY
2020/12/09 23:08:57 [2/1/1] [client [::1]:8699] is reading from path 'cam', 1 tr
ack with udp
Input #0, rtsp, from 'rtsp://localhost:8554/cam':
  Metadata:
    title           : Stream
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 1920x1080 [SAR 1:1 DAR
16:9], 30 tbr, 90k tbn, 30 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[mpeg4 @ 000000b8ee8eb600] warning: first frame is no keyframe
[libx264 @ 000000b8ee8e8d80] using SAR=1/1
[libx264 @ 000000b8ee8e8d80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
AVX FMA3 BMI2 AVX2
[libx264 @ 000000b8ee8e8d80] profile Constrained Baseline, level 4.0, 4:2:0, 8-b
it
[libx264 @ 000000b8ee8e8d80] 264 - core 161 - H.264/MPEG-4 AVC codec - Copyleft
2003-2020 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0
:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 c
hroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset
=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 b
luray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=20
scenecut=0 intra_refresh=0 rc=abr mbtree=0 bitrate=500 ratetol=1.0 qcomp=0.60 qp
min=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
2020/12/09 23:08:58 [3/1/1] [client [::1]:8700] connected
2020/12/09 23:08:58 [3/1/1] [client [::1]:8700] OPTIONS
2020/12/09 23:08:58 [3/1/1] [client [::1]:8700] ANNOUNCE
2020/12/09 23:08:58 [3/1/1] [client [::1]:8700] ERR: unable to find a valid conf
iguration for path 'newfps'
2020/12/09 23:08:58 [2/1/1] [client [::1]:8700] disconnected
Could not write header for output file #0 (incorrect codec parameters ?): Server
 returned 400 Bad Request
Error initializing output stream 0:0 --
[libx264 @ 000000b8ee8e8d80] final ratefactor: 41.13
2020/12/09 23:08:58 [2/1/1] [client [::1]:8699] TEARDOWN
2020/12/09 23:08:58 [1/1/0] [client [::1]:8699] disconnected
Conversion failed!
frame=  336 fps= 30 q=31.0 size=N/A time=00:00:11.16 bitrate=N/A dup=0 drop=1 sp
frame=  351 fps= 30 q=31.0 size=N/A time=00:00:11.66 bitrate=N/A dup=0 drop=1 sp
[dshow @ 000000fc23dbd6c0] real-time buffer [Jabra PanaCast] [video input] too f
ull or near too full (136% of size: 3041280 [rtbufsize parameter])! frame droppe
d!
Last message repeated 8 times

What could be the problem here?

[aler9]

ERR: unable to find a valid configuration for path 'newfps'

Just add a configuration for the path "newfps", in this way

paths:
  newfps:
  cam:
    runOnInit: ffmpeg -f dshow -i video="Jabra PanaCast" -f rtsp rtsp://localhost:$RTSP_PORT/$RTSP_PATH
    runOnInitRestart: yes
    runOnPublish: ffmpeg -i rtsp://localhost:$RTSP_PORT/$RTSP_PATH -c:v libx264 -preset ultrafast -b:v 500k -max_muxing_queue_size 1024 -filter:v fps=fps=20 -f rtsp rtsp://localhost:$RTSP_PORT/newfps
    runOnPublishRestart: yes