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• Using FFMPEG with Xvfb, Can't get a smooth video output

  13 juillet 2020, par Emax

  I'm trying to stream to twitch from a linux server, I've installed Xvfb and FFMPEG, the live starts fine, but I can't get a smooth video output.

  


  Setps :

  


  Xvfb :1 -screen 0 1920x1080x24 &amp;&#xA;export DISPLAY=:1&#xA;&#xA;&#xA;ffmpeg -probesize 60M -video_size "1920x1080" -framerate 60 -f x11grab -i :1.0 -f flv -ac 2 -crf 23 \&#xA;       -vcodec libx264 -g 120 -b:v 3000k -minrate 3000k -maxrate 3000k -pix_fmt yuv420p\&#xA;       -s "1920x1080" -preset veryfast -tune zerolatency -acodec libmp3lame -threads 4 -strict normal \&#xA;       -bufsize 12000k "rtmp://live-mil.twitch.tv/app/<key>"&#xA;</key>

  


  I'm 100% sure that the app I'm trying to record output 60fps

  


  Also the FFMPEG output is

  


  ffmpeg version 4.1.6-1~deb10u1 Copyright (c) 2000-2020 the FFmpeg developers&#xA;  built with gcc 8 (Debian 8.3.0-6)&#xA;  configuration: --prefix=/usr --extra-version=&#x27;1~deb10u1&#x27; --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared&#xA;  libavutil      56. 22.100 / 56. 22.100&#xA;  libavcodec     58. 35.100 / 58. 35.100&#xA;  libavformat    58. 20.100 / 58. 20.100&#xA;  libavdevice    58.  5.100 / 58.  5.100&#xA;  libavfilter     7. 40.101 /  7. 40.101&#xA;  libavresample   4.  0.  0 /  4.  0.  0&#xA;  libswscale      5.  3.100 /  5.  3.100&#xA;  libswresample   3.  3.100 /  3.  3.100&#xA;  libpostproc    55.  3.100 / 55.  3.100&#xA;Input #0, x11grab, from &#x27;:1.0&#x27;:&#xA;  Duration: N/A, start: 1594669358.267783, bitrate: N/A&#xA;    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 60 fps, 59.94 tbr, 1000k tbn, 1000k tbc&#xA;Stream mapping:&#xA;  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))&#xA;Press [q] to stop, [?] for help&#xA;[libx264 @ 0x55a2b7e28ec0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2&#xA;[libx264 @ 0x55a2b7e28ec0] profile High, level 4.2&#xA;[libx264 @ 0x55a2b7e28ec0] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=4 lookahead_threads=4 sliced_threads=1 slices=4 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=1 keyint=120 keyint_min=12 scenecut=40 intra_refresh=0 rc_lookahead=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=3000 vbv_bufsize=12000 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00&#xA;Output #0, flv, to &#x27;rtmp://live.twitch.tv/app/<key>&#x27;:&#xA;  Metadata:&#xA;    encoder         : Lavf58.20.100&#xA;    Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1920x1080, q=-1--1, 3000 kb/s, 60 fps, 1k tbn, 60 tbc&#xA;    Metadata:&#xA;      encoder         : Lavc58.35.100 libx264&#xA;    Side data:&#xA;      cpb: bitrate max/min/avg: 3000000/0/3000000 buffer size: 12000000 vbv_delay: -1&#xA;frame=  436 fps= 61 q=22.0 size=     287kB time=00:00:08.73 bitrate= 269.1kbits/s dup=0 drop=0 speed=1.22x&#xA;</key>

  


  I've also tryed to output the recording to an mp4 video file but I got the same result : a laggy video, It's like ffmpeg is recording the input at a lower framerate than 60, how can I fix this ?

  


• Error using ffmpeg image2pipe with phantomjs to render video from webpage screenshots

  14 novembre 2016, par user1690179

  I am trying to use phantomjs with ffmpeg to complie videos from screenshots of a webpage as described here :
  https://groups.google.com/forum/# !msg/phantomjs/wluVGGjhL90/oGBXqh7QP44J

  I have the following test.js file :

  var page = require('webpage').create();
  
  
  
  page.clipRect = { top: 0, left: 0, width: 900, height: 800};
  
  page.viewportSize = { width: 900, height: 800};
  
  
  
  var url = 'http://dl.dropbox.com/u/621993/voronoi/voronoi.html';
  
  var frames = 100;
  
  
  
  page.open(url, function(){
  
      setInterval(function(){
  
          page.render('/dev/stdout');
  
  
  
          if( frames == 0 ){
  
              phantom.exit();
  
          }
  
  
  
          frames--;
  
  
  
      }, 100);
  
  });

  Then I run this command, taken from the link above :

  $ phantomjs test.js |ffmpeg -c:v png -f image2pipe -r 10 -sameq -i - -y test.mp4

  Including -sameq causes an error in ffmpeg, so I took it out and ran :

  $ phantomjs test.js |ffmpeg -c:v png -f image2pipe -r 10 -i - -y test.mp4

  I get the following output from ffmpeg :

  ffmpeg version 2.0 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 22 2013 09:14:18 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
    configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --arch=x86_64 --enable-runtime-cpudetect
  
    libavutil      52. 38.100 / 52. 38.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.100 / 55. 12.100
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 79.101 /  3. 79.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, image2pipe, from 'pipe:':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: png, rgba, 900x800 [SAR 2835:2835 DAR 9:8], 10 fps, 10 tbr, 10 tbn, 10 tbc
  
  No pixel format specified, yuv444p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x7f8973803800] using SAR=1/1
  
  [libx264 @ 0x7f8973803800] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x7f8973803800] profile High 4:4:4 Predictive, level 3.1, 4:4:4 8-bit
  
  [libx264 @ 0x7f8973803800] 264 - core 133 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - 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=4 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=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'test.mp4':
  
    Metadata:
  
      encoder         : Lavf55.12.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 900x800 [SAR 1:1 DAR 9:8], q=-1--1, 10240 tbn, 10 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png -> libx264)
  
  pipe:: Input/output error0 size=      65kB time=00:00:04.10 bitrate= 130.5kbits/s    
  
  frame=   93 fps= 15 q=-1.0 Lsize=      71kB time=00:00:09.10 bitrate=  63.8kbits/s    
  
  video:69kB audio:0kB subtitle:0 global headers:0kB muxing overhead 2.696543%
  
  [libx264 @ 0x7f8973803800] frame I:1     Avg QP:15.17  size: 50212
  
  [libx264 @ 0x7f8973803800] frame P:24    Avg QP: 8.91  size:   575
  
  [libx264 @ 0x7f8973803800] frame B:68    Avg QP: 9.69  size:    87
  
  [libx264 @ 0x7f8973803800] consecutive B-frames:  2.2%  0.0%  3.2% 94.6%
  
  [libx264 @ 0x7f8973803800] mb I  I16..4: 64.2% 19.6% 16.1%
  
  [libx264 @ 0x7f8973803800] mb P  I16..4:  2.8%  0.2%  0.1%  P16..4:  0.5%  0.0%  0.0%  0.0%  0.0%    skip:96.3%
  
  [libx264 @ 0x7f8973803800] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  3.1%  0.0%  0.0%  direct: 0.0%  skip:96.9%  L0:76.4% L1:23.6% BI: 0.0%
  
  [libx264 @ 0x7f8973803800] 8x8 transform intra:13.9% inter:54.0%
  
  [libx264 @ 0x7f8973803800] coded y,u,v intra: 7.4% 4.8% 5.2% inter: 0.1% 0.1% 0.1%
  
  [libx264 @ 0x7f8973803800] i16 v,h,dc,p: 68% 31%  2%  0%
  
  [libx264 @ 0x7f8973803800] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 48% 20% 32%  0%  0%  0%  0%  0%  0%
  
  [libx264 @ 0x7f8973803800] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 31% 20%  3%  3%  3%  5%  3%  4%
  
  [libx264 @ 0x7f8973803800] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7f8973803800] ref P L0: 91.9%  0.0%  7.4%  0.7%
  
  [libx264 @ 0x7f8973803800] ref B L0: 20.5% 79.5%
  
  [libx264 @ 0x7f8973803800] ref B L1: 99.9%  0.1%
  
  [libx264 @ 0x7f8973803800] kb/s:60.16

  The output test.mp4 file is a blank 10 second video - just a black screen. From what i can tell, I am getting a pipe: : Input/output error from ffmpeg.

  I am pretty new to ffmpeg and I have tried changing some parameters and video codecs in the ffmpeg call, but have not found a solution yet. Can anyone advise ?

• How to add black frames and keep the framerate ?

  3 mars 2020, par Patryk

  I have a black image from which I generate videos filled with black color only for specified lengths that I can then concatenate with my destination videos. This is how I produce it :

  ffmpeg -loop 1 -i black.png -t 00:00:00.066 \ 
  
      -c:v libx264 -pix_fmt yuv420p -vf scale=840:480,fps=15 out66ms.mp4

  with the following ffmpeg output :

  Input #0, png_pipe, from 'black.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: png, rgba(pc), 608x342 [SAR 5669:5669 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x7fadf3826e00] using SAR=64/63
  
  [libx264 @ 0x7fadf3826e00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x7fadf3826e00] profile High, level 3.0
  
  [libx264 @ 0x7fadf3826e00] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=12 lookahead_threads=2 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=15 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'out66ms.mp4':
  
    Metadata:
  
      encoder         : Lavf58.29.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 840x480 [SAR 64:63 DAR 16:9], q=-1--1, 15 fps, 15360 tbn, 15 tbc
  
      Metadata:
  
        encoder         : Lavc58.54.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=    1 fps=0.0 q=27.0 Lsize=       2kB time=00:00:00.00 bitrate=201107.7kbits/s speed=0.0031x
  
  video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 100.984009%
  
  [libx264 @ 0x7fadf3826e00] frame I:1     Avg QP:12.00  size:   123
  
  [libx264 @ 0x7fadf3826e00] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 0x7fadf3826e00] 8x8 transform intra:0.0%
  
  [libx264 @ 0x7fadf3826e00] coded y,uvDC,uvAC intra: 0.0% 0.0% 0.0%
  
  [libx264 @ 0x7fadf3826e00] i16 v,h,dc,p: 97%  0%  3%  0%
  
  [libx264 @ 0x7fadf3826e00] i8c dc,h,v,p: 100%  0%  0%  0%
  
  [libx264 @ 0x7fadf3826e00] kb/s:14.76

  I’d like to then concatenate it with videos like this one :

  ffprobe file.ts
  
  Input #0, mpegts, from 'file.ts':
  
    Duration: 00:00:06.67, start: 0.000000, bitrate: 1090 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (Baseline) ([27][0][0][0] / 0x001B), yuv420p(progressive), 864x480, 90k tbr, 90k tbn, 180k tbc

  but as soon as I concatenate it using concat demuxer like that :

  ffmpeg -y -hide_banner \
  
      -f concat -safe 0 \
  
      -i <(echo "file '$PWD/out66ms.mp4'"; for f in dir/*.ts; do echo "file '$PWD/$f'"; done) \
  
      -c copy \
  
      output.mp

  I get this :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:01:41.38, start: 0.000000, bitrate: 170 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 840x480 [SAR 64:63 DAR 16:9], 170 kb/s, 2.67 fps, 2.67 tbr, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  Which has 2.67 fps whereas not adding this empty black video to concatenation gives the following (desired 15 fps) :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:00:17.29, start: 0.000000, bitrate: 1001 kb/s
  
      Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 864x480, 999 kb/s, 15.62 fps, 15.58 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  EDIT

  I’ve tried reencoding instead of copying :

  ffmpeg -y -hide_banner \
  
      -f concat -safe 0 \
  
      -i <(echo "file '$PWD/out66ms.mp4'"; for f in dir/*.ts; do echo "file '$PWD/$f'"; done) \
  
      -c:v libx264 -vf scale=840:480,fps=15 \
  
      output.mp

  But I get a similar result :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:01:41.00, start: 0.000000, bitrate: 555 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1680x480 [SAR 64:63 DAR 32:9], 554 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  even though that the fps is set properly the video is too long and slowed down.

  How to properly add those black filled videos to preserve fps or set it to desired value ?