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  • very low latency streaminig with ffmpeg using a webcam

    22 mars 2017, par userDtrm

    I’m trying to configure ffmpeg to do a real-time video streaming using a webcam. The ffmpeg encoder command I use is as follows.

    ffmpeg -f v4l2 -input_format yuyv422 -s 640x480 -i /dev/video0 -c:v libx264 -profile:v baseline -trellis 0 -subq 1 -level 32 -preset superfast -tune zerolatency -me_method epzs -crf 30 -threads 0 -bufsize 1 -refs 4 -coder 0 -b_strategy 0 -bf 0 -sc_threshold 0 -x264-params vbv-maxrate=2000:slice-max-size=1500:keyint=30:min-keyint=10: -pix_fmt yuv420p -an -f mpegts udp://192.168.1.8:5001

    The ffplay command used to display the video feed is,

    ffplay -analyzeduration 1 -fflags -nobuffer -i udp://192.168.1.8:5001

    However, I’m experiencing a latency of 0.5 - 1.0s latency in the video stream. Is there a way to reduce this to a number less than 100ms. Also, when I replace the v4l2 camera capture with a screen capture using x11grab, the stream is almost real-time and I experience no noticeable delays. Moreover, changing the encoder from x264 to mpeg2 had no effect on the latency. In addition, the statistics from the ffmpeg shows that the encoder is performing at a 30fps rate, which I believe indicates that the encoding is real-time. This leaves me with only one reason for the experienced delay.

    • Is there a significant delay in buffers when using v4l2 during video capturing in a webcam ?
    • I don’t think the transmission delay is in effect in this case as I see no latencies when screen capture is used under the same conditions.
    • Can this latency be further reduced ?. Can someone think of a different encoder configuration to be used instead of the one that I’ve been using ?.

    Any suggestions or assistance is highly appreciated.

    Thank You.

  • Streamplayers can't play stream when ffmpeg using x264 codec

    12 novembre 2016, par iCheater Retaehci

    When i start process ffmpeg and use -c:v libx264 and -x264opts users, who open my stream can’t play it, but after i restart ffmpeg - they can see stream.
    When i turn off -c:v libx264 and -x264opts users can see stream without any problems.

    sudo ffmpeg \
    
    -f video4linux2 \
    
    -i /dev/video0 \
    
    -filter:v "crop=250:480:195:0" \
    
    -intra-refresh 1 \
    
    -pix_fmt yuv420p \
    
    -framerate 30  \
    
    -c:v libx264 \
    
    -preset ultrafast \
    
    -threads 8 \
    
    -tune zerolatency  \
    
    -analyzeduration 0 \
    
    -an \
    
    -s 640x480 \
    
    -probesize 32 \
    
    -x264opts crf=20:vbv-maxrate=12000:vbv-bufsize=100:intra-refresh=1:slice-max-size=1500:keyint=30:ref=1 \
    
    -f flv rtmp://xx.xx.xx.xx/webcam

    log

    cheater@cheater-vm:~$ sh webcam.sh 
    
ffmpeg version 3.0.2-1ubuntu3 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 6.1.1 (Ubuntu 6.1.1-11ubuntu12) 20160805
    
  configuration: --prefix=/usr --extra-version=1ubuntu3 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-chromaprint --enable-libx264
    
  libavutil      55. 17.103 / 55. 17.103
    
  libavcodec     57. 24.102 / 57. 24.102
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 31.100 /  6. 31.100
    
  libavresample   3.  0.  0 /  3.  0.  0
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, video4linux2,v4l2, from '/dev/video0':
    
  Duration: N/A, start: 12237.477963, bitrate: 184320 kb/s
    
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 800x600, 184320 kb/s, 24 fps, 24 tbr, 1000k tbn, 1000k tbc
    
[libx264 @ 0x55f9d286a280] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
    
[libx264 @ 0x55f9d286a280] VBV buffer size cannot be smaller than one 
    
frame, using 500 kbit
    
[libx264 @ 0x55f9d286a280] profile Constrained Baseline, level 3.1
    
[libx264 @ 0x55f9d286a280] 264 - core 148 r2699 a5e06b9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - 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=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=8 lookahead_threads=8 sliced_threads=1 slices=8 slice_max_size=1500 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=30 keyint_min=3 scenecut=0 intra_refresh=1 rc_lookahead=0 rc=crf mbtree=0 crf=20.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=12000 vbv_bufsize=500 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=0
    
Output #0, flv, to 'rtmp://xx.xx.xx.xx/webcam':
    
  Metadata:
    
    encoder         : Lavf57.25.100
    
    Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 800x600, q=-1--1, 24 fps, 1k tbn, 24 tbc
    
    Metadata:
    
      encoder         : Lavc57.24.102 libx264
    
    Side data:
    
      unknown side data type 10 (24 bytes)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
    
Press [q] to stop, [?] for help
    
[swscaler @ 0x55f9d28972a0] Warning: data is not aligned! This can lead to a speedloss
    

    
frame=   22 fps=0.0 q=19.0 size=     339kB time=00:00:00.91 bitrate=3032.9kbits/
    
frame=   30 fps= 30 q=19.0 size=     463kB time=00:00:01.41 bitrate=2674.7kbits/
    
frame=   38 fps= 25 q=20.0 size=     577kB time=00:00:01.91 bitrate=2465.8kbits/
    
frame=   45 fps= 22 q=21.0 size=     700kB time=00:00:02.41 bitrate=2372.3kbits/
    
frame=   53 fps= 21 q=21.0 size=     835kB time=00:00:02.91 bitrate=2344.7kbits/
    
frame=   60 fps= 20 q=20.0 size=     945kB time=00:00:03.41 bitrate=2266.3kbits/
    
frame=   68 fps= 19 q=21.0 size=    1118kB time=00:00:03.91 bitrate=2339.4kbits/
    
frame=   76 fps= 19 q=20.0 size=    1270kB time=00:00:04.45 bitrate=2332.5kbits/
    
frame=   83 fps= 18 q=20.0 size=    1385kB time=00:00:04.91 bitrate=2308.2kbits/
    
frame=   91 fps= 18 q=20.0 size=    1509kB time=00:00:05.45 bitrate=2263.9kbits/
    
frame=   98 fps= 18 q=19.0 size=    1611kB time=00:00:05.91 bitrate=2230.5kbits/
    
frame=  106 fps= 17 q=19.0 size=    1735kB time=00:00:06.45 bitrate=2200.1kbits/
    
frame=  113 fps= 17 q=20.0 size=    1829kB time=00:00:06.91 bitrate=2165.9kbits/
    
frame=  121 fps= 17 q=20.0 size=    1940kB time=00:00:07.45 bitrate=2131.0kbits/
    
frame=  129 fps= 17 q=21.0 size=    2087kB time=00:00:08.00 bitrate=2137.4kbits/
    
frame=  136 fps= 17 q=21.0 size=    2213kB time=00:00:08.45 bitrate=2143.6kbits/
    
frame=  144 fps= 17 q=21.0 size=    2360kB time=00:00:09.00 bitrate=2148.0kbits/
    
frame=  151 fps= 17 q=20.0 size=    2487kB time=00:00:09.45 bitrate=2153.8kbits/
    
frame=  159 fps= 17 q=21.0 size=    2639kB time=00:00:10.00 bitrate=2161.5kbits/
    
frame=  166 fps= 16 q=21.0 size=    2755kB time=00:00:10.45 bitrate=2158.2kbits/
    
frame=  174 fps= 16 q=21.0 size=    2898kB time=00:00:11.00 bitrate=2158.1kbits/
    
frame=  181 fps= 16 q=21.0 size=    3027kB time=00:00:11.45 bitrate=2164.2kbits/
    
frame=  189 fps= 16 q=21.0 size=    3161kB time=00:00:12.00 bitrate=2157.8kbits/
    
frame=  197 fps= 16 q=22.0 size=    3313kB time=00:00:12.54 bitrate=2164.4kbits/
    
frame=  204 fps= 16 q=21.0 size=    3453kB time=00:00:13.00 bitrate=2175.7kbits/
    
frame=  212 fps= 16 q=20.0 size=    3586kB time=00:00:13.54 bitrate=2169.6kbits/
    
frame=  219 fps= 16 q=19.0 size=    3699kB time=00:00:14.00 bitrate=2164.2kbits/
    
frame=  227 fps= 16 q=20.0 size=    3819kB time=00:00:14.54 bitrate=2151.6kbits/
    
frame=  234 fps= 16 q=20.0 size=    3919kB time=00:00:15.00 bitrate=2140.3kbits/
    

    
[flv @ 0x55f9d2869000] Failed to update header with correct duration.
    
[flv @ 0x55f9d2869000] Failed to update header with correct filesize.
    

    
frame=  236 fps= 16 q=20.0 Lsize=    3947kB time=00:00:15.12 bitrate=2137.7kbits/s speed=1.02x    
    
video:3938kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.208510%
    
[libx264 @ 0x55f9d286a280] frame I:1     Avg QP:19.08  size: 45311
    
[libx264 @ 0x55f9d286a280] frame P:235   Avg QP:20.24  size: 16965
    
[libx264 @ 0x55f9d286a280] mb I  I16..4: 100.0%  0.0%  0.0%
    
[libx264 @ 0x55f9d286a280] mb P  I16..4: 20.3%  0.0%  0.0%  P16..4: 59.4%  0.0%  0.0%  0.0% 0.0%    skip:20.3%
    
[libx264 @ 0x55f9d286a280] coded y,uvDC,uvAC intra: 29.8% 61.6% 29.4% inter: 38.0% 56.2% 13.1%
    
[libx264 @ 0x55f9d286a280] i16 v,h,dc,p: 16% 51% 23% 10%
    
[libx264 @ 0x55f9d286a280] i8c dc,h,v,p: 56% 30%  9%  4%
    
[libx264 @ 0x55f9d286a280] kb/s:3280.43
    
Exiting normally, received signal 2.

  • Streamplayers can't play stream when ffmpeg using x264 codec

    12 novembre 2016, par iCheater Retaehci

    When i start process ffmpeg and use -c:v libx264 and -x264opts users, who open my stream can’t play it, but after i restart ffmpeg - they can see stream.
    When i turn off -c:v libx264 and -x264opts users can see stream without any problems.

    sudo ffmpeg \
    
    -f video4linux2 \
    
    -i /dev/video0 \
    
    -filter:v "crop=250:480:195:0" \
    
    -intra-refresh 1 \
    
    -pix_fmt yuv420p \
    
    -framerate 30  \
    
    -c:v libx264 \
    
    -preset ultrafast \
    
    -threads 8 \
    
    -tune zerolatency  \
    
    -analyzeduration 0 \
    
    -an \
    
    -s 640x480 \
    
    -probesize 32 \
    
    -x264opts crf=20:vbv-maxrate=12000:vbv-bufsize=100:intra-refresh=1:slice-max-size=1500:keyint=30:ref=1 \
    
    -f flv rtmp://xx.xx.xx.xx/webcam

    log

    cheater@cheater-vm:~$ sh webcam.sh 
    
ffmpeg version 3.0.2-1ubuntu3 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 6.1.1 (Ubuntu 6.1.1-11ubuntu12) 20160805
    
  configuration: --prefix=/usr --extra-version=1ubuntu3 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-chromaprint --enable-libx264
    
  libavutil      55. 17.103 / 55. 17.103
    
  libavcodec     57. 24.102 / 57. 24.102
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 31.100 /  6. 31.100
    
  libavresample   3.  0.  0 /  3.  0.  0
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, video4linux2,v4l2, from '/dev/video0':
    
  Duration: N/A, start: 12237.477963, bitrate: 184320 kb/s
    
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 800x600, 184320 kb/s, 24 fps, 24 tbr, 1000k tbn, 1000k tbc
    
[libx264 @ 0x55f9d286a280] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
    
[libx264 @ 0x55f9d286a280] VBV buffer size cannot be smaller than one 
    
frame, using 500 kbit
    
[libx264 @ 0x55f9d286a280] profile Constrained Baseline, level 3.1
    
[libx264 @ 0x55f9d286a280] 264 - core 148 r2699 a5e06b9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - 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=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=8 lookahead_threads=8 sliced_threads=1 slices=8 slice_max_size=1500 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=30 keyint_min=3 scenecut=0 intra_refresh=1 rc_lookahead=0 rc=crf mbtree=0 crf=20.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=12000 vbv_bufsize=500 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=0
    
Output #0, flv, to 'rtmp://xx.xx.xx.xx/webcam':
    
  Metadata:
    
    encoder         : Lavf57.25.100
    
    Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 800x600, q=-1--1, 24 fps, 1k tbn, 24 tbc
    
    Metadata:
    
      encoder         : Lavc57.24.102 libx264
    
    Side data:
    
      unknown side data type 10 (24 bytes)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
    
Press [q] to stop, [?] for help
    
[swscaler @ 0x55f9d28972a0] Warning: data is not aligned! This can lead to a speedloss
    

    
frame=   22 fps=0.0 q=19.0 size=     339kB time=00:00:00.91 bitrate=3032.9kbits/
    
frame=   30 fps= 30 q=19.0 size=     463kB time=00:00:01.41 bitrate=2674.7kbits/
    
frame=   38 fps= 25 q=20.0 size=     577kB time=00:00:01.91 bitrate=2465.8kbits/
    
frame=   45 fps= 22 q=21.0 size=     700kB time=00:00:02.41 bitrate=2372.3kbits/
    
frame=   53 fps= 21 q=21.0 size=     835kB time=00:00:02.91 bitrate=2344.7kbits/
    
frame=   60 fps= 20 q=20.0 size=     945kB time=00:00:03.41 bitrate=2266.3kbits/
    
frame=   68 fps= 19 q=21.0 size=    1118kB time=00:00:03.91 bitrate=2339.4kbits/
    
frame=   76 fps= 19 q=20.0 size=    1270kB time=00:00:04.45 bitrate=2332.5kbits/
    
frame=   83 fps= 18 q=20.0 size=    1385kB time=00:00:04.91 bitrate=2308.2kbits/
    
frame=   91 fps= 18 q=20.0 size=    1509kB time=00:00:05.45 bitrate=2263.9kbits/
    
frame=   98 fps= 18 q=19.0 size=    1611kB time=00:00:05.91 bitrate=2230.5kbits/
    
frame=  106 fps= 17 q=19.0 size=    1735kB time=00:00:06.45 bitrate=2200.1kbits/
    
frame=  113 fps= 17 q=20.0 size=    1829kB time=00:00:06.91 bitrate=2165.9kbits/
    
frame=  121 fps= 17 q=20.0 size=    1940kB time=00:00:07.45 bitrate=2131.0kbits/
    
frame=  129 fps= 17 q=21.0 size=    2087kB time=00:00:08.00 bitrate=2137.4kbits/
    
frame=  136 fps= 17 q=21.0 size=    2213kB time=00:00:08.45 bitrate=2143.6kbits/
    
frame=  144 fps= 17 q=21.0 size=    2360kB time=00:00:09.00 bitrate=2148.0kbits/
    
frame=  151 fps= 17 q=20.0 size=    2487kB time=00:00:09.45 bitrate=2153.8kbits/
    
frame=  159 fps= 17 q=21.0 size=    2639kB time=00:00:10.00 bitrate=2161.5kbits/
    
frame=  166 fps= 16 q=21.0 size=    2755kB time=00:00:10.45 bitrate=2158.2kbits/
    
frame=  174 fps= 16 q=21.0 size=    2898kB time=00:00:11.00 bitrate=2158.1kbits/
    
frame=  181 fps= 16 q=21.0 size=    3027kB time=00:00:11.45 bitrate=2164.2kbits/
    
frame=  189 fps= 16 q=21.0 size=    3161kB time=00:00:12.00 bitrate=2157.8kbits/
    
frame=  197 fps= 16 q=22.0 size=    3313kB time=00:00:12.54 bitrate=2164.4kbits/
    
frame=  204 fps= 16 q=21.0 size=    3453kB time=00:00:13.00 bitrate=2175.7kbits/
    
frame=  212 fps= 16 q=20.0 size=    3586kB time=00:00:13.54 bitrate=2169.6kbits/
    
frame=  219 fps= 16 q=19.0 size=    3699kB time=00:00:14.00 bitrate=2164.2kbits/
    
frame=  227 fps= 16 q=20.0 size=    3819kB time=00:00:14.54 bitrate=2151.6kbits/
    
frame=  234 fps= 16 q=20.0 size=    3919kB time=00:00:15.00 bitrate=2140.3kbits/
    

    
[flv @ 0x55f9d2869000] Failed to update header with correct duration.
    
[flv @ 0x55f9d2869000] Failed to update header with correct filesize.
    

    
frame=  236 fps= 16 q=20.0 Lsize=    3947kB time=00:00:15.12 bitrate=2137.7kbits/s speed=1.02x    
    
video:3938kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.208510%
    
[libx264 @ 0x55f9d286a280] frame I:1     Avg QP:19.08  size: 45311
    
[libx264 @ 0x55f9d286a280] frame P:235   Avg QP:20.24  size: 16965
    
[libx264 @ 0x55f9d286a280] mb I  I16..4: 100.0%  0.0%  0.0%
    
[libx264 @ 0x55f9d286a280] mb P  I16..4: 20.3%  0.0%  0.0%  P16..4: 59.4%  0.0%  0.0%  0.0% 0.0%    skip:20.3%
    
[libx264 @ 0x55f9d286a280] coded y,uvDC,uvAC intra: 29.8% 61.6% 29.4% inter: 38.0% 56.2% 13.1%
    
[libx264 @ 0x55f9d286a280] i16 v,h,dc,p: 16% 51% 23% 10%
    
[libx264 @ 0x55f9d286a280] i8c dc,h,v,p: 56% 30%  9%  4%
    
[libx264 @ 0x55f9d286a280] kb/s:3280.43
    
Exiting normally, received signal 2.

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