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• Capture camera + mic and encode to h264/aac on macOS

  16 décembre 2018, par Flock Dawson

  I’m having trouble capturing and encoding audio+video on-the-fly on macOS.

  I tried two options :

  1. ffmpeg

     ffmpeg -threads 0 -f avfoundation -s 1920x1080 -framerate 25 -I 0:0 -async 441 -c:v libx264 -preset medium -pix_fmt yuv420p -crf 22 -c:a libfdk_aac -aq 95 -y

  2. gstreamer

     gst-launch-1.0 -ve avfvideosrc device-index=0 ! video/x-raw,width=1920,height=1080,framerate=25/1 ! vtenc_h264 ! queue ! mp4mux name=mux ! filesink location=out.mp4  osxaudiosrc device=0 ! audio/x-raw ! faac midside=false ! queue ! mux.

  The ffmpeg option works, but only for lower resolutions. With higher resolutions, the Mac mini (2018 gen) can’t do the heavy lifting. I think because I installed ffmpeg with brew, so it wasn’t compiled on my machine, meaning it doesn’t use the h264 hardware encoder in the Mac ?

  The gstreamer option works as well, but there’s a slight audio/video sync issue (audio is 100ms ahead of the video). I can’t seem to add delay to the GStreamer queue (it ignores it) :

  queue max-size-buffers=0 max-size-time=0 max-size-bytes=0 min-threshold-time=100000000

  Anyone who has any experience with this ? Thanks !

• ffmpeg video slideshow only takes first image

  14 décembre 2018, par Erhan

  I wanted to create an .mp4 video with a framerate of 1 fps out of 10 images. I followed https://trac.ffmpeg.org/wiki/Slideshow and got to (my images are in the folder I am running the command from and are name img000.png, img001.png, etc.)

  path_to_ffmpeg\ffmpeg.exe -framerate 1 -i img%03d.png output.mp4

  However only the first image is taken to the video and it only shows one image !

  After trying multiple permutations of -framerate and -r options and positions of the options, I did not recieve any better results.

  Does anyone know what might have gone wrong even in this simple case ? Thanks.

  Full log :

  C:\Users\foo\Documents\path>C:\bar\ffmpeg-4.0.2-win64-static\bin\ffmpeg.ex
  
  e -framerate 1 -i img%03d.png output.mp4    
  
  ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers    
  
    built with gcc 7.3.1 (GCC) 20180722    
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --e    
  
  nable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libblur    
  
  ay --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-    
  
  libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enab    
  
  le-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-li    
  
  bvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --en    
  
  able-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-    
  
  libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enabl    
  
  e-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enabl    
  
  e-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enab    
  
  le-dxva2 --enable-avisynth    
  
    libavutil      56. 14.100 / 56. 14.100    
  
    libavcodec     58. 18.100 / 58. 18.100    
  
    libavformat    58. 12.100 / 58. 12.100    
  
    libavdevice    58.  3.100 / 58.  3.100    
  
    libavfilter     7. 16.100 /  7. 16.100    
  
    libswscale      5.  1.100 /  5.  1.100    
  
    libswresample   3.  1.100 /  3.  1.100    
  
    libpostproc    55.  1.100 / 55.  1.100    
  
  Input #0, image2, from 'img%03d.png':    
  
    Duration: 00:00:10.00, start: 0.000000, bitrate: N/A    
  
      Stream #0:0: Video: png, rgba(pc), 959x550 [SAR 2834:2834 DAR 959:550], 1 fp    
  
  s, 1 tbr, 1 tbn, 1 tbc    
  
  File 'output.mp4' already exists. Overwrite ? [y/N] y    
  
  Stream mapping:    
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))    
  
  Press [q] to stop, [?] for help    
  
  [libx264 @ 0000000000611040] using SAR=1/1    
  
  [libx264 @ 0000000000611040] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2    
  
  AVX FMA3 BMI2 AVX2    
  
  [libx264 @ 0000000000611040] profile High 4:4:4 Predictive, level 3.1, 4:4:4 8-b    
  
  it    
  
  [libx264 @ 0000000000611040] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC cod    
  
  ec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 r    
  
  ef=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed    
  
  _ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pski    
  
  p=1 chroma_qp_offset=4 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 deci    
  
  mate=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=1    
  
  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 'output.mp4':    
  
    Metadata:    
  
      encoder         : Lavf58.12.100    
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 959x550 [SA    
  
  R 1:1 DAR 959:550], q=-1--1, 1 fps, 16384 tbn, 1 tbc    
  
      Metadata:    
  
        encoder         : Lavc58.18.100 libx264    
  
      Side data:    
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1    
  
  frame=   10 fps=0.0 q=-1.0 Lsize=      20kB time=00:00:07.00 bitrate=  23.1kbits    
  
  /s speed=68.6x    
  
  video:19kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing ov    
  
  erhead: 5.046419%    
  
  [libx264 @ 0000000000611040] frame I:1     Avg QP: 4.41  size: 14084    
  
  [libx264 @ 0000000000611040] frame P:3     Avg QP:12.31  size:   632    
  
  [libx264 @ 0000000000611040] frame B:6     Avg QP:19.11  size:   436    
  
  [libx264 @ 0000000000611040] consecutive B-frames: 20.0%  0.0%  0.0% 80.0%    
  
  [libx264 @ 0000000000611040] mb I  I16..4: 89.7%  0.0% 10.3%    
  
  [libx264 @ 0000000000611040] mb P  I16..4:  0.2%  0.0%  0.1%  P16..4:  0.5% 0.1    
  
  %  0.1%  0.0%  0.0%    skip:98.9%    
  
  [libx264 @ 0000000000611040] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.6%  0.1    
  
  %  0.1%  direct: 0.0%  skip:99.1%  L0:22.0% L1:73.7% BI: 4.3%    
  
  [libx264 @ 0000000000611040] coded y,u,v intra: 6.1% 2.5% 2.6% inter: 0.2% 0.1%    
  
  0.1%    
  
  [libx264 @ 0000000000611040] i16 v,h,dc,p: 72% 25%  3%  0%    
  
  [libx264 @ 0000000000611040] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 31% 20%  2%  2%    
  
  2%  3%  5%  2%    
  
  [libx264 @ 0000000000611040] Weighted P-Frames: Y:0.0% UV:0.0%    
  
  [libx264 @ 0000000000611040] ref P L0: 65.8%  1.5% 26.5%  6.1%    
  
  [libx264 @ 0000000000611040] ref B L0: 77.0% 12.7% 10.3%    
  
  [libx264 @ 0000000000611040] ref B L1: 88.6% 11.4%
  
  [libx264 @ 0000000000611040] kb/s:14.87

• Revision 35042 : Un truc qui trainait

  9 février 2010, par kent1@… — Log

  Un truc qui trainait