[FFmpeg-user] RTSP to Twitch

[Sébastien Bonaimé]

Hi,

I would like to stream a Revotech H6EV200-S-30-L 0S77
(https://www.desertcart.com.my/products/57000744-revotech-hd-1920-x-1080p-2-0mp-indoor-ip-camera-mini-type-security-metal-camera-onvif-p2p-ip-cctv-cam-system-i706-black)
camera pointing to a bird nest through my raspberry pi4 to my twitch
channel.

First, I need to configure CBR or VBR in the camera. Using ffprobe
with the url of the camera I have the following results:
VBR 3072 smart_codec enable
    Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive),
1920x1080, 25 fps, 25 tbr, 90k tbn, 180k tbc
CBR 3072 smart_codec enable
    Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive),
1920x1080, 25 tbr, 90k tbn, 180k tbc

FFmpeg version is
ffmpeg version 4.1.6-1~deb10u1+rpt1 Copyright (c) 2000-2020 the FFmpeg
developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)

included x264 codec are : libx264 libx264rgb h264_omx h264_v4l2m2m h264_vaapi

Here is my command line

url='rtsp://user:password@192.168.1.32:8554/0/av0'
twitch_url='rtmp://cdg.contribute.live-video.net/app/MY_twith_key'

     QUAL="ultrafast"  # one of the many FFMPEG preset
     CBR="3500k" # constant bitrate (should be between 1000k - 3000k)

        ffmpeg  -probesize  10M  -rtsp_transport tcp -thread_queue_size 1000k \
                  -i $url \
                -vsync 0 -enc_time_base -1 \
                 -bufsize 1024k -preset "$QUAL" \
                -b:v $CBR  -minrate $CBR -maxrate $CBR   -keyint_min 24 -g 24 \
                -crf 10  -c:v libx264    \
                -f flv $twitch_url


With camera in CBR mode, I can't reach 25 FPS but only 14. And the
stream to twitch does not last more than ew seconds. What can I do to
improve the command ?

Thanks

[rtsp @ 0x8952e0] Missing PPS in sprop-parameter-sets, ignoring
Input #0, rtsp, from 'rtsp://user:password@192.168.1.32:8554/0/av0':
  Metadata:
    title           : Session Streamed by LIBZRTSP
    comment         : 0
  Duration: N/A, start: 0.040000, bitrate: N/A
    Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive),
1920x1080, 25 fps, 25 tbr, 90k tbn, 180k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x8fd140] MB rate (734400000) > level limit (16711680)
[libx264 @ 0x8fd140] using cpu capabilities: ARMv6 NEON
[libx264 @ 0x8fd140] profile Constrained Baseline, level 6.2
[libx264 @ 0x8fd140] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC
codec - Copyleft 2003-2018 - 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 chroma_me=1 trellis=1
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
bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=24
keyint_min=13 scenecut=0 intra_refresh=0 rc_lookahead=0 rc=crf
mbtree=0 crf=10.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4
vbv_maxrate=3500 vbv_bufsize=1024 crf_max=0.0 nal_hrd=none filler=0
ip_ratio=1.40 aq=0
Output #0, flv, to 'rtmp://cdg.contribute.live-video.net/app/MY_twith_key':
  Metadata:
    title           : Session Streamed by LIBZRTSP
    comment         : 0
    encoder         : Lavf58.20.100
    Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007),
yuvj420p(pc), 1920x1080, q=-1--1, 3500 kb/s, 25 fps, 1k tbn, 90k tbc
    Metadata:
      encoder         : Lavc58.35.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 3500000/0/3500000 buffer size: 1024000
vbv_delay: -1
[libx264 @ 0x8fd140] non-strictly-monotonic PTS
frame=  190 fps= 14 q=23.0 size=    3136kB time=00:00:08.88
bitrate=2892.7kbits/s speed=0.66x