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• Problem with ffplay from webcam stream using complex filters

  29 mai 2022, par efelbar

  I'm trying to stream video from a webcam (at /dev/video2) through ffplay to scale and recolor it, add some text, and then reduce the number of colors with palettes. I don't get any errors, but running the ffplay command :

  


  ffplay -i /dev/video2 -vf "hflip,\
  colorbalance=\
    rs=0.4:\
    bs=-0.4\
  ,\
  scale=\
    trunc(iw/8):\
    trunc(ih/8)\
  ,\
  drawtext=\
    text=\
      'efelbar':\
      fontcolor=white:\
      fontsize=10:\
      box=1:\
      boxcolor=black:\
      boxborderw=5:\
      x=(w-text_w)/2:\
      y=(h-text_h)/2\
  ,\
  split[s0][s1];\
  [s0]palettegen=\
    max_colors=16\
  [p];\
  [s1][p]paletteuse"


  


  seems to stall, and fails to produce video output.

  


  Running the simpler command ffplay -i /dev/video2 -vf "split[s0][s1];[s0]palettegen=max_colors=16[p];[s1][p]paletteuse", which takes a stream from a webcam and (should) reduce the number of colors, results in it just sitting there without showing the actual output stream. This might just be a performance issue because I'm on older hardware, but it doesn't give output relfective of that.

  


  The output of that command is as follows :

  


  ffplay version n5.0 Copyright (c) 2003-2022 the FFmpeg developers
  built with gcc 11.2.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-shared --enable-version3
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
Input #0, video4linux2,v4l2, from '/dev/video2':B sq=    0B f=0/0   
  Duration: N/A, start: 254970.739108, bitrate: 147456 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn


  


  I'm running this on a thinkpad t420s, so I definitely wouldn't be surprised if my laptop just can't process video that quickly. If that is the case, suggestions for optimizations would be great !

  


• capture my webcam and encode to mp4 with ffmpeg, but the x264 works bad

  17 septembre 2015, par zhangxm1991

  here is my version :
  ffmpeg version : 2.3.3
  libx264 version:142.x

  I wat to capture my video and use ffmpeg and x264 to a mp4 file. the solution is 320x240.
  But i found that the video file is so big. Then i found that the P frame and B frame is very big, even nearly equal to the I frame.I do not know why.

  here is my code :

      c->codec_id = codec_id;
  
      c->bit_rate = 400000;
  
      c->width    = 320;
  
      c->height   = 240;
  
      c->time_base.den = 10;
  
      c->time_base.num = 1;
  
      c->pix_fmt       = AV_PIX_FMT_YUV420P;

  Here is my program output :

  [libx264 @ 0xb6200fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX 
  
  
  
  [libx264 @ 0xb6200fc0] profile High, level 1.3
  
  
  
  [libx264 @ 0xb6200fc0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=400 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  
  
  Output #0, mp4, to '/home/2014_09_12/0002b6429579/5/2014_09_12_18_39_12_600.mp4':
  
  
  
      Stream #0:0: Video: h264 (libx264), yuv420p, 320x240, q=-1--1, 400 kb/s, 10 tbc
  
  
  
      Stream #0:1: Audio: aac, 8000 Hz, mono, fltp, 32 kb/s
  
  
  
  [mp4 @ 0xb62005e0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
  
  
  
  [mp4 @ 0xb62005e0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
  
  
  
  [mp4 @ 0xb62005e0] Encoder did not produce proper pts, making some up.
  
  
  
  [libx264 @ 0xb6200fc0] frame I:3     Avg QP: 2.79  size: 72996
  
  
  
  [libx264 @ 0xb6200fc0] frame P:383   Avg QP: 0.14  size: 54075
  
  
  
  [libx264 @ 0xb6200fc0] frame B:216   Avg QP: 1.95  size: 64784
  
  
  
  [libx264 @ 0xb6200fc0] consecutive B-frames: 30.1% 63.2%  6.0%  0.7%
  
  
  
  [libx264 @ 0xb6200fc0] mb I  I16..4: 16.1% 12.7% 71.2%
  
  
  
  [libx264 @ 0xb6200fc0] mb P  I16..4:  3.5%  5.1% 15.9%  P16..4: 20.3% 22.8% 14.0%  0.0%  0.0%    skip:18.3%
  
  
  
  [libx264 @ 0xb6200fc0] mb B  I16..4:  0.4%  2.5%  8.2%  B16..8: 32.6% 19.8% 13.5%  
  
  direct:22.2%  skip: 0.8%  L0:25.5% L1:12.8% BI:61.6%
  
  
  
  [libx264 @ 0xb6200fc0] final ratefactor: -32.89
  
  
  
  [libx264 @ 0xb6200fc0] 8x8 transform intra:21.0% inter:29.6%
  
  
  
  [libx264 @ 0xb6200fc0] coded y,uvDC,uvAC intra: 100.0% 100.0% 100.0% inter: 83.3% 80.9% 80.9%
  
  
  
  [libx264 @ 0xb6200fc0] i16 v,h,dc,p:  5%  7% 42% 46%
  
  
  
  [libx264 @ 0xb6200fc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 12% 23%  8%  6%  6%  8%  9% 14%
  
  
  
  [libx264 @ 0xb6200fc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 11% 19% 10%  8%  8% 10% 10% 12%
  
  
  
  [libx264 @ 0xb6200fc0] i8c dc,h,v,p: 78%  3%  4% 15%
  
  
  
  [libx264 @ 0xb6200fc0] Weighted P-Frames: Y:0.5% UV:0.3%
  
  
  
  [libx264 @ 0xb6200fc0] ref P L0: 43.4% 14.6% 19.0% 22.9%  0.1%
  
  
  
  [libx264 @ 0xb6200fc0] ref B L0: 63.3% 35.7%  1.1%
  
  
  
  [libx264 @ 0xb6200fc0] ref B L1: 97.0%  3.0%
  
  
  
  [libx264 @ 0xb6200fc0] kb/s:4.53
  
  
  
  [aac @ 0xb6201ba0] 2 frames left in the queue on closing

• capture my webcam and encode to mp4 with ffmpeg, but the x264 works bad

  17 septembre 2015, par zhangxm1991

  here is my version :
  ffmpeg version : 2.3.3
  libx264 version:142.x

  I wat to capture my video and use ffmpeg and x264 to a mp4 file. the solution is 320x240.
  But i found that the video file is so big. Then i found that the P frame and B frame is very big, even nearly equal to the I frame.I do not know why.

  here is my code :

      c->codec_id = codec_id;
  
      c->bit_rate = 400000;
  
      c->width    = 320;
  
      c->height   = 240;
  
      c->time_base.den = 10;
  
      c->time_base.num = 1;
  
      c->pix_fmt       = AV_PIX_FMT_YUV420P;

  Here is my program output :

  [libx264 @ 0xb6200fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX 
  
  
  
  [libx264 @ 0xb6200fc0] profile High, level 1.3
  
  
  
  [libx264 @ 0xb6200fc0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=400 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  
  
  Output #0, mp4, to '/home/2014_09_12/0002b6429579/5/2014_09_12_18_39_12_600.mp4':
  
  
  
      Stream #0:0: Video: h264 (libx264), yuv420p, 320x240, q=-1--1, 400 kb/s, 10 tbc
  
  
  
      Stream #0:1: Audio: aac, 8000 Hz, mono, fltp, 32 kb/s
  
  
  
  [mp4 @ 0xb62005e0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
  
  
  
  [mp4 @ 0xb62005e0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
  
  
  
  [mp4 @ 0xb62005e0] Encoder did not produce proper pts, making some up.
  
  
  
  [libx264 @ 0xb6200fc0] frame I:3     Avg QP: 2.79  size: 72996
  
  
  
  [libx264 @ 0xb6200fc0] frame P:383   Avg QP: 0.14  size: 54075
  
  
  
  [libx264 @ 0xb6200fc0] frame B:216   Avg QP: 1.95  size: 64784
  
  
  
  [libx264 @ 0xb6200fc0] consecutive B-frames: 30.1% 63.2%  6.0%  0.7%
  
  
  
  [libx264 @ 0xb6200fc0] mb I  I16..4: 16.1% 12.7% 71.2%
  
  
  
  [libx264 @ 0xb6200fc0] mb P  I16..4:  3.5%  5.1% 15.9%  P16..4: 20.3% 22.8% 14.0%  0.0%  0.0%    skip:18.3%
  
  
  
  [libx264 @ 0xb6200fc0] mb B  I16..4:  0.4%  2.5%  8.2%  B16..8: 32.6% 19.8% 13.5%  
  
  direct:22.2%  skip: 0.8%  L0:25.5% L1:12.8% BI:61.6%
  
  
  
  [libx264 @ 0xb6200fc0] final ratefactor: -32.89
  
  
  
  [libx264 @ 0xb6200fc0] 8x8 transform intra:21.0% inter:29.6%
  
  
  
  [libx264 @ 0xb6200fc0] coded y,uvDC,uvAC intra: 100.0% 100.0% 100.0% inter: 83.3% 80.9% 80.9%
  
  
  
  [libx264 @ 0xb6200fc0] i16 v,h,dc,p:  5%  7% 42% 46%
  
  
  
  [libx264 @ 0xb6200fc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 12% 23%  8%  6%  6%  8%  9% 14%
  
  
  
  [libx264 @ 0xb6200fc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 11% 19% 10%  8%  8% 10% 10% 12%
  
  
  
  [libx264 @ 0xb6200fc0] i8c dc,h,v,p: 78%  3%  4% 15%
  
  
  
  [libx264 @ 0xb6200fc0] Weighted P-Frames: Y:0.5% UV:0.3%
  
  
  
  [libx264 @ 0xb6200fc0] ref P L0: 43.4% 14.6% 19.0% 22.9%  0.1%
  
  
  
  [libx264 @ 0xb6200fc0] ref B L0: 63.3% 35.7%  1.1%
  
  
  
  [libx264 @ 0xb6200fc0] ref B L1: 97.0%  3.0%
  
  
  
  [libx264 @ 0xb6200fc0] kb/s:4.53
  
  
  
  [aac @ 0xb6201ba0] 2 frames left in the queue on closing