[FFmpeg-user] RTSP to Twitch
Sébastien Bonaimé
s.bonaime at gmail.com
Thu Mar 11 08:37:09 EET 2021
Thanks for your advice. Here is my changes :
- changes my camera settings to VBR with 3532kb/s and 30 FPS
- With VLC, I can see the RTSP stream which is 1920x1080 @29.970030
FPS with H264 - MPEG-4 AVC (part10) (H264)
-compile ffmpeg on my pi4. Now I have ffmpeg version 4.3.2 Copyright
(c) 2000-2021 the FFmpeg developers
built with gcc 8 (Raspbian 8.3.0-6+rpi1)
configuration: --extra-cflags=-I/usr/local/include
--extra-ldflags=-L/usr/local/lib --extra-libs='-lpthread -lm -latomic'
--arch=armel --enable-gmp --enable-gpl --enable-libaom --enable-libass
--enable-libdav1d --enable-libdrm --enable-libfdk-aac
--enable-libfreetype --enable-libkvazaar --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus
--enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libssh
--enable-libvorbis --enable-libvpx --enable-libwebp --enable-libzimg
--enable-libx264 --enable-libxml2 --enable-mmal --enable-nonfree
--enable-omx --enable-omx-rpi --enable-version3 --target-os=linux
--enable-pthreads --enable-openssl --enable-hardcoded-tables
- I simplify my ffmpeg command with this one
ffmpeg r -rtsp_transport tcp -thread_queue_size 3000k \
-i $url \
-vsync 0 -enc_time_base -1 \
-c:a copy \
-c:v copy \
-f flv $twitch_url
Now, I have only 11 FPS ! Why am I not able to reach 30 FPS ?
[rtsp @ 0x1899220] Missing PPS in sprop-parameter-sets, ignoring
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, rtsp, from 'rtsp://view3:my_pass@192.168.1.32:8554/0/av0':
Metadata:
title : Session Streamed by LIBZRTSP
comment : 0
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive),
1920x1080, 10 fps, 10 tbr, 90k tbn, 180k tbc
Stream #0:1: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
Output #0, flv, to 'rtmp://cdg.contribute.live-video.net/app/my_key':
Metadata:
title : Session Streamed by LIBZRTSP
comment : 0
encoder : Lavf58.20.100
Stream #0:0: Video: h264 (Main) ([7][0][0][0] / 0x0007),
yuvj420p(pc, bt709, progressive), 1920x1080, q=2-31, 10 fps, 10 tbr,
1k tbn, 90k tbc
Stream #0:1: Audio: pcm_mulaw ([8][0][0][0] / 0x0008), 8000 Hz,
mono, s16, 64 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[flv @ 0x18b5ee0] Timestamps are unset in a packet for stream 0. This
is deprecated and will stop working in the future. Fix your code to
set the timestamps properly
frame= 684 fps= 11 q=-1.0 size= 8797kB time=00:01:08.40
bitrate=1053.6kbits/s speed=1.07x
If I turn the rtsp_transport to udp, I still have 11 FPS and I miss
some packets.
Press [q] to stop, [?] for help
[flv @ 0x1ecd190] Timestamps are unset in a packet for stream 0. This
is deprecated and will stop working in the future. Fix your code to
set the timestamps properly
[rtsp @ 0x1e70220] max delay reached. need to consume packet
[rtsp @ 0x1e70220] RTP: missed 31 packets
[rtsp @ 0x1e70220] max delay reached. need to consume
packetbitrate=1008.1kbits/s speed=1.14x
[rtsp @ 0x1e70220] RTP: missed 3 packets
[rtsp @ 0x1e70220] max delay reached. need to consume packetbitrate=
982.2kbits/s speed=1.12x
[rtsp @ 0x1e70220] RTP: missed 4 packets
[rtsp @ 0x1e70220] max delay reached. need to consume packet
[rtsp @ 0x1e70220] RTP: missed 1 packets
[rtsp @ 0x1e70220] max delay reached. need to consume packetbitrate=
993.0kbits/s speed= 1.1x
[rtsp @ 0x1e70220] RTP: missed 1 packets
[rtsp @ 0x1e70220] max delay reached. need to consume
packetbitrate=1004.5kbits/s speed=1.08x
[rtsp @ 0x1e70220] RTP: missed 7 packets
[rtsp @ 0x1e70220] max delay reached. need to consume packet
[rtsp @ 0x1e70220] RTP: missed 1 packets
[rtsp @ 0x1e70220] max delay reached. need to consume
packetbitrate=1008.6kbits/s speed=1.07x
[rtsp @ 0x1e70220] RTP: missed 7 packets
[rtsp @ 0x1e70220] max delay reached. need to consume
packetbitrate=1010.3kbits/s speed=1.04x
[rtsp @ 0x1e70220] RTP: missed 10 packets
frame= 954 fps= 10 q=-1.0 size= 11858kB time=00:01:35.74
bitrate=1014.6kbits/s speed=1.04xPress [q] to stop, [?] for help
Thanks
Le mer. 10 mars 2021 à 14:58, Moritz Barsnick <barsnick at gmx.net> a écrit :
>
> Hi Sébastien,
>
> On Wed, Mar 10, 2021 at 12:55:25 +0100, Sébastien Bonaimé wrote:
>
> > included x264 codec are : libx264 libx264rgb h264_omx h264_v4l2m2m h264_vaapi
>
> > 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 ?
>
> - Do you really need to reencode for twitch? Does it need CBR?
> Otherwise, you could just use the "copy" codec.
>
> - AFAIU, you cannot combine "-b:v" and "-crf". I believe (fro mlooking
> at your logs) that the latter is being ignored.
>
> - CRF 10 is really really low. What are you trying to achieve? Is the
> default of CRF 27 not good enough? CRF 10 is bound to take a lot of
> additional compute power (if not ignored).
>
> - You listed other available encoders. Have you tried any of them? (I
> have no experience with HW accel on RaspPi, others may pitch in.)
>
> > FFmpeg version is
> > ffmpeg version 4.1.6-1~deb10u1+rpt1 Copyright (c) 2000-2020 the FFmpeg developers
>
> You should try to get hold of a newer version of ffmpeg. You may have
> to compile yourself though. A newer version probably won't help with
> the speed of libx264, but the support for the other HWAccels may have
> improved.
>
> Cheers,
> Moritz
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