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• Bad video quality and only 3 fps

  25 juillet 2019, par ApplowPi

  There are a few things wrong with the quality of the output file when I run this command.

  arecord -d 0 -r 48000 -c 2 -f S16_LE -t wav -D sysdefault:CARD=tc358743 | avconv -t 0 -i pipe:0 -f v4l2 -i /dev/video0 -c:v libx264 -r 30 -acodec aac -ar 48000 -vcodec flv -strict experimental -y -f flv test.flv

  The audio seems okay at the moment but, if I’m reading it correctly (at the very bottom of the output below), the fps is about 3 and the quality is at 31, which I understand is the worse. This is the output during the process.

  I’m looking to get 30 fps (ideally 60 if possible).

  I’m pretty new to this, any help would be great. Thanks in advance.

  ffmpeg version 3.2.10-1~deb9u1+rpt2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 6.3.0 (Raspbian 6.3.0-18+rpi1+deb9u1) 20170516
  
    configuration: --prefix=/usr --extra-version='1~deb9u1+rpt2' --toolchain=hardened --libdir=/usr/lib/arm-linux-gnueabihf --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --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-libzmq --enable-libzvbi --enable-omx-rpi --enable-mmal --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --arch=armhf --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, wav, from 'pipe:0':
  
    Duration: N/A, bitrate: 1536 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
  
  [video4linux2,v4l2 @ 0x172e110] ioctl(VIDIOC_G_PARM): Inappropriate ioctl for device
  
  [video4linux2,v4l2 @ 0x172e110] Time per frame unknown
  
  Input #1, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 927.631204, bitrate: N/A
  
      Stream #1:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 1280x720, 120 tbr, 1000k tbn, 1000k tbc
  
  Output #0, flv, to 'test.flv':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 1280x720, q=2-31, 200 kb/s, 120 fps, 1k tbn, 120 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 flv
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 48000 Hz, stereo, fltp, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc57.64.101 aac
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (rawvideo (native) -> flv1 (flv))
  
    Stream #0:0 -> #0:1 (pcm_s16le (native) -> aac (native))
  
  [wav @ 0x1728730] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
  
  [video4linux2,v4l2 @ 0x172e110] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
  
  overrun!!! (at least 9513.101 ms long)44kB time=00:00:00.97 bitrate=2890.9kbits/s speed=0.0987x
  
  overrun!!! (at least 25.077 ms long) 363kB time=00:00:01.84 bitrate=1614.1kbits/s speed=0.162x
  
  overrun!!! (at least 254.192 ms long)421kB time=00:00:02.97 bitrate=1159.1kbits/s speed=0.226x
  
  overrun!!! (at least 93.349 ms long) 441kB time=00:00:03.86 bitrate= 935.3kbits/s speed=0.263x
  
  overrun!!! (at least 198.942 ms long)461kB time=00:00:04.97 bitrate= 758.6kbits/s speed=0.303x
  
  overrun!!! (at least 155.909 ms long)526kB time=00:00:06.14 bitrate= 701.0kbits/s speed=0.337x
  
  frame=   54 fps=2.8 q=31.0 Lsize=     534kB time=00:00:06.67 bitrate= 655.6kbits/s speed=0.352x

  Running different commands to see what happens. This command :

  avconv -t 0 -i /dev/video0 -c:v libx264 -preset ultrafast -y newtest.h264

  Slowly builds up to 40 fps but the result is still poor. Feels like it’s 5 fps not 40. The CPU percentage when running this is 65-70%. Output is :

  ffmpeg version 3.2.10-1~deb9u1+rpt2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 6.3.0 (Raspbian 6.3.0-18+rpi1+deb9u1) 20170516
  
    configuration: --prefix=/usr --extra-version='1~deb9u1+rpt2' --toolchain=hardened --libdir=/usr/lib/arm-linux-gnueabihf --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --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-libzmq --enable-libzvbi --enable-omx-rpi --enable-mmal --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --arch=armhf --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [video4linux2,v4l2 @ 0x16d4600] ioctl(VIDIOC_G_PARM): Inappropriate ioctl for device
  
  [video4linux2,v4l2 @ 0x16d4600] Time per frame unknown
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 5015.769341, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 1280x720, 59.94 tbr, 1000k tbn, 1000k tbc
  
  No pixel format specified, yuv422p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x16d77e0] using cpu capabilities: ARMv6 NEON
  
  [libx264 @ 0x16d77e0] profile High 4:2:2, level 3.2, 4:2:2 8-bit
  
  Output #0, h264, to 'newtest.h264':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: h264 (libx264), yuv422p, 1280x720, q=-1--1, 59.94 fps, 59.94 tbn, 59.94 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame= 1813 fps= 37 q=-1.0 Lsize=    3218kB time=00:00:30.24 bitrate= 871.5kbits/s dup=1700 drop=0 speed=0.617x
  
  video:3218kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
  
  [libx264 @ 0x16d77e0] frame I:8     Avg QP:14.00  size:170114
  
  [libx264 @ 0x16d77e0] frame P:1805  Avg QP:15.46  size:  1071
  
  [libx264 @ 0x16d77e0] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 0x16d77e0] mb P  I16..4:  0.4%  0.0%  0.0%  P16..4:  2.0%  0.0%  0.0%  0.0%  0.0%    skip:97.6%
  
  [libx264 @ 0x16d77e0] coded y,uvDC,uvAC intra: 43.4% 28.3% 19.2% inter: 1.1% 0.8% 0.2%
  
  [libx264 @ 0x16d77e0] i16 v,h,dc,p: 61% 26%  8%  5%
  
  [libx264 @ 0x16d77e0] i8c dc,h,v,p: 68% 12% 17%  4%
  
  [libx264 @ 0x16d77e0] kb/s:871.45

  Running this command :

  avconv -t 0 -i /dev/video0 -r 60 -c:v libx264 -preset ultrafast -y newtest.flv 

  (just specifying a different output file format, results in a CPU usage of about 30% and produces this output :

  avconv -t 0 -i /dev/video0 -r 60 -c:v libx264 -preset ultrafast -y newtest.flv
  
  ffmpeg version 3.2.10-1~deb9u1+rpt2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 6.3.0 (Raspbian 6.3.0-18+rpi1+deb9u1) 20170516
  
    configuration: --prefix=/usr --extra-version='1~deb9u1+rpt2' --toolchain=hardened --libdir=/usr/lib/arm-linux-gnueabihf --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --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-libzmq --enable-libzvbi --enable-omx-rpi --enable-mmal --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --arch=armhf --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [video4linux2,v4l2 @ 0x527620] ioctl(VIDIOC_G_PARM): Inappropriate ioctl for device
  
  [video4linux2,v4l2 @ 0x527620] Time per frame unknown
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 6071.912862, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 1280x720, 120 tbr, 1000k tbn, 1000k tbc
  
  No pixel format specified, yuv422p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x52a870] using cpu capabilities: ARMv6 NEON
  
  [libx264 @ 0x52a870] profile High 4:2:2, level 3.2, 4:2:2 8-bit
  
  [libx264 @ 0x52a870] 264 - core 148 r2748 97eaef2 - 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=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
  
  Output #0, flv, to 'newtest.flv':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv422p, 1280x720, q=-1--1, 60 fps, 1k tbn, 60 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=  158 fps=4.1 q=-1.0 Lsize=     878kB time=00:00:30.70 bitrate= 234.2kbits/s speed=0.803x
  
  video:874kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.385400%
  
  [libx264 @ 0x52a870] frame I:1     Avg QP:20.00  size: 68854
  
  [libx264 @ 0x52a870] frame P:157   Avg QP: 8.93  size:  5261
  
  [libx264 @ 0x52a870] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 0x52a870] mb P  I16..4:  1.4%  0.0%  0.0%  P16..4:  7.7%  0.0%  0.0%  0.0%  0.0%    skip:90.9%
  
  [libx264 @ 0x52a870] coded y,uvDC,uvAC intra: 28.1% 13.8% 13.4% inter: 3.4% 2.7% 2.3%
  
  [libx264 @ 0x52a870] i16 v,h,dc,p: 76% 22%  1%  1%
  
  [libx264 @ 0x52a870] i8c dc,h,v,p: 88%  4%  7%  0%
  
  [libx264 @ 0x52a870] kb/s:231.42

• Recording a video by webcam on Raspberry Pi [on hold]

  9 août 2019, par Stan Eskin

  Need a python3 script for recording a video by a USB webcam on Raspberry Pi. For instance, I’d like to capture a video to the RasPi’s SD card when a motion sensor gives the signal.

  I’ve found this code for the terminal :
  ffmpeg -f v4l2 -r 25 -s 640x480 -i /dev/video0 out.avi

  Unfortunately, I don’t know how to implement it in my python3 script.

• ffmpeg cannot enumerate audio only devices [on hold]

  28 août 2019, par ark1974

  I am using the following ffmpeg command-line to enumerate audio only devices :

  ffmpeg -list_devices true -f dshow -i dummy

  However it displays "could not enumerate audio only devices" although Realtek audio device is present. I am using Windows 10, 4.72 .NET Framework and the audio device driver is up to date and the ffmpeg used is latest built.

  I want to use ffmpeg command line in my c++ project and the existing audio card, I need advice in this regard.