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• FFMPEG extracting 1 second resized with copy codec

  28 avril 2019, par boblapointe

  How can I extract 1 second ( using fast seek ) from a video, resize it, using vp9 ? I always get the same errors. Here are the bare bone commands I’m trying :

  ffmpeg -ss 00:00:10 -i test.webm -to 00:00:01 -filter:v "scale=min(iw\,1280):min(ih\,720):force_original_aspect_ratio=decrease" -c:v libvpx-vp9 -y output.webm

  It returns :

  "Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

  After playing around I realize that this will work :

  ffmpeg -ss 00:00:10 -i test.webm -to 00:00:01 -c copy -y output.webm

  Not ideal but at least it works, so I add the filter :

  ffmpeg -ss 00:00:10 -i test.webm -to 00:00:01 -filter:v "scale=min(iw\,1280):min(ih\,720):force_original_aspect_ratio=decrease" -c copy -y output.webm

  Ant then I get :

  "Filtering and streamcopy cannot be used together."

  I’ve tried all kinds of combinations, unsuccessfully. Any hint would be appreciated. Thank you

  ---

  Here is the full log of the first command :

      ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg developers
        built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
        configuration : —prefix=/usr —extra-version=0ubuntu0.18.04.1 —toolchain=hardened —libdir=/usr/lib/x86_64-linux-gnu —incdir=/usr/include/x86_64-linux-gnu —enable-gpl —disable-stripping —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-libmp3lame —enable-libmysofa —enable-libopenjpeg —enable-libopenmpt —enable-libopus —enable-libpulse —enable-librubberband —enable-librsvg —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-libxml2 —enable-libxvid —enable-libzmq —enable-libzvbi —enable-omx —enable-openal —enable-opengl —enable-sdl2 —enable-libdc1394 —enable-libdrm —enable-libiec61883 —enable-chromaprint —enable-frei0r —enable-libopencv —enable-libx264 —enable-shared
        libavutil      55. 78.100 / 55. 78.100
        libavcodec     57.107.100 / 57.107.100
        libavformat    57. 83.100 / 57. 83.100
        libavdevice    57. 10.100 / 57. 10.100
        libavfilter     6.107.100 /  6.107.100
        libavresample   3.  7.  0 /  3.  7.  0
        libswscale      4.  8.100 /  4.  8.100
        libswresample   2.  9.100 /  2.  9.100
        libpostproc    54.  7.100 / 54.  7.100
      Splitting the commandline.
      Reading option ’-ss’ ... matched as option ’ss’ (set the start time offset) with argument ’00:00:10’.
      Reading option ’-i’ ... matched as input url with argument ’test.webm’.
      Reading option ’-to’ ... matched as option ’to’ (record or transcode stop time) with argument ’00:00:01’.
      Reading option ’-filter:v’ ... matched as option ’filter’ (set stream filtergraph) with argument ’scale=min(iw\,1280):min(ih\,720):force_original_aspect_ratio=decrease’.
      Reading option ’-c:v’ ... matched as option ’c’ (codec name) with argument ’libvpx-vp9’.
      Reading option ’-y’ ... matched as option ’y’ (overwrite output files) with argument ’1’.
      Reading option ’-v’ ... matched as option ’v’ (set logging level) with argument ’debug’.
      Reading option ’output.webm’ ... matched as output url.
      Finished splitting the commandline.
      Parsing a group of options : global .
      Applying option y (overwrite output files) with argument 1.
      Applying option v (set logging level) with argument debug.
      Successfully parsed a group of options.
      Parsing a group of options : input url test.webm.
      Applying option ss (set the start time offset) with argument 00:00:10.
      Successfully parsed a group of options.
      Opening an input file : test.webm.
      [NULL @ 0x55ce679f8920] Opening ’test.webm’ for reading
      [file @ 0x55ce679f9340] Setting default whitelist ’file,crypto’
      [matroska,webm @ 0x55ce679f8920] Format matroska,webm probed with size=2048 and score=100
      st:0 removing common factor 1000000 from timebase
      [matroska,webm @ 0x55ce679f8920] Before avformat_find_stream_info() pos : 566 bytes read:32768 seeks:0 nb_streams:1
      [matroska,webm @ 0x55ce679f8920] All info found
      [matroska,webm @ 0x55ce679f8920] After avformat_find_stream_info() pos : 72449 bytes read:72449 seeks:0 frames:1
      Input #0, matroska,webm, from ’test.webm’ :
        Metadata :
          ENCODER : Lavf57.83.100
        Duration : 00:00:15.03, start : 5.016000, bitrate : 1146 kb/s
          Stream #0:0(eng), 1, 1/1000 : Video : vp9 (Profile 0), 1 reference frame, yuv420p(tv), 1280x720, 0/1, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
          Metadata :
            DURATION : 00:00:15.025000000
      Successfully opened the file.
      Parsing a group of options : output url output.webm.
      Applying option to (record or transcode stop time) with argument 00:00:01.
      Applying option filter:v (set stream filtergraph) with argument scale=min(iw\,1280):min(ih\,720):force_original_aspect_ratio=decrease.
      Applying option c:v (codec name) with argument libvpx-vp9.
      Successfully parsed a group of options.
      Opening an output file : output.webm.
      [file @ 0x55ce67b1e820] Setting default whitelist ’file,crypto’
      Successfully opened the file.
      detected 8 logical cores
      Stream mapping :
        Stream #0:0 -> #0:0 (vp9 (native) -> vp9 (libvpx-vp9))
      Press [q] to stop, [?] for help
      cur_dts is invalid (this is harmless if it occurs once at the start per stream)
          Last message repeated 1 times
      [matroska,webm @ 0x55ce679f8920] first_dts 5016 not matching first dts 10395 (pts 10395, duration 41) in the queue
      cur_dts is invalid (this is harmless if it occurs once at the start per stream)
          Last message repeated 6 times
      [Parsed_scale_0 @ 0x55ce67a7c520] Setting ’w’ to value ’min(iw,1280)’
      [Parsed_scale_0 @ 0x55ce67a7c520] Setting ’h’ to value ’min(ih,720)’
      [Parsed_scale_0 @ 0x55ce67a7c520] Setting ’force_original_aspect_ratio’ to value ’decrease’
      [Parsed_scale_0 @ 0x55ce67a7c520] Setting ’flags’ to value ’bicubic’
      [Parsed_scale_0 @ 0x55ce67a7c520] w:min(iw,1280) h:min(ih,720) flags :’bicubic’ interl:0
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’video_size’ to value ’1280x720’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’pix_fmt’ to value ’0’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’time_base’ to value ’1/1000’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’pixel_aspect’ to value ’1/1’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’sws_param’ to value ’flags=2’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] Setting ’frame_rate’ to value ’24000/1001’
      [graph 0 input from stream 0:0 @ 0x55ce67a7cea0] w:1280 h:720 pixfmt:yuv420p tb:1/1000 fr:24000/1001 sar:1/1 sws_param:flags=2
      [format @ 0x55ce67ad7d60] compat : called with args=[yuv420p|yuva420p|yuv422p|yuv440p|yuv444p|gbrp]
      [format @ 0x55ce67ad7d60] Setting ’pix_fmts’ to value ’yuv420p|yuva420p|yuv422p|yuv440p|yuv444p|gbrp’
      [AVFilterGraph @ 0x55ce67aec740] query_formats : 6 queried, 5 merged, 0 already done, 0 delayed
      [Parsed_scale_0 @ 0x55ce67a7c520] w:1280 h:720 fmt:yuv420p sar:1/1 -> w:1280 h:720 fmt:yuv420p sar:1/1 flags:0x4
      [libvpx-vp9 @ 0x55ce67b32200] v1.7.0
      [libvpx-vp9 @ 0x55ce67b32200] —prefix=/usr —enable-pic —enable-shared —disable-install-bins —disable-install-srcs —size-limit=16384x16384 —enable-postproc —enable-multi-res-encoding —enable-temporal-denoising —enable-vp9-temporal-denoising —enable-vp9-postproc —target=x86_64-linux-gcc
      [libvpx-vp9 @ 0x55ce67b32200] vpx_codec_enc_cfg
      [libvpx-vp9 @ 0x55ce67b32200] generic settings
        g_usage :                      0
        g_threads :                    8
        g_profile :                    0
        g_w :                          320
        g_h :                          240
        g_bit_depth :                  8
        g_input_bit_depth :            8
        g_timebase :                   1/30
        g_error_resilient :            0
        g_pass :                       0
        g_lag_in_frames :              25
      [libvpx-vp9 @ 0x55ce67b32200] rate control settings
        rc_dropframe_thresh :          0
        rc_resize_allowed :            0
        rc_resize_up_thresh :          60
        rc_resize_down_thresh :        30
        rc_end_usage :                 0
        rc_twopass_stats_in :          (nil)(0)
        rc_target_bitrate :            256
      [libvpx-vp9 @ 0x55ce67b32200] quantizer settings
        rc_min_quantizer :             0
        rc_max_quantizer :             63
      [libvpx-vp9 @ 0x55ce67b32200] bitrate tolerance
        rc_undershoot_pct :            25
        rc_overshoot_pct :             25
      [libvpx-vp9 @ 0x55ce67b32200] decoder buffer model
        rc_buf_sz :                    6000
        rc_buf_initial_sz :            4000
        rc_buf_optimal_sz :            5000
      [libvpx-vp9 @ 0x55ce67b32200] 2 pass rate control settings
        rc_2pass_vbr_bias_pct :        50
        rc_2pass_vbr_minsection_pct :  0
        rc_2pass_vbr_maxsection_pct :  2000
      [libvpx-vp9 @ 0x55ce67b32200] keyframing settings
        kf_mode :                      1
        kf_min_dist :                  0
        kf_max_dist :                  128
      [libvpx-vp9 @ 0x55ce67b32200]
      [libvpx-vp9 @ 0x55ce67b32200] vpx_codec_enc_cfg
      [libvpx-vp9 @ 0x55ce67b32200] generic settings
        g_usage :                      0
        g_threads :                    0
        g_profile :                    0
        g_w :                          1280
        g_h :                          720
        g_bit_depth :                  8
        g_input_bit_depth :            8
        g_timebase :                   1001/24000
        g_error_resilient :            0
        g_pass :                       0
        g_lag_in_frames :              25
      [libvpx-vp9 @ 0x55ce67b32200] rate control settings
        rc_dropframe_thresh :          0
        rc_resize_allowed :            0
        rc_resize_up_thresh :          60
        rc_resize_down_thresh :        30
        rc_end_usage :                 0
        rc_twopass_stats_in :          (nil)(0)
        rc_target_bitrate :            200
      [libvpx-vp9 @ 0x55ce67b32200] quantizer settings
        rc_min_quantizer :             0
        rc_max_quantizer :             63
      [libvpx-vp9 @ 0x55ce67b32200] bitrate tolerance
        rc_undershoot_pct :            25
        rc_overshoot_pct :             25
      [libvpx-vp9 @ 0x55ce67b32200] decoder buffer model
        rc_buf_sz :                    6000
        rc_buf_initial_sz :            4000
        rc_buf_optimal_sz :            5000
      [libvpx-vp9 @ 0x55ce67b32200] 2 pass rate control settings
        rc_2pass_vbr_bias_pct :        50
        rc_2pass_vbr_minsection_pct :  0
        rc_2pass_vbr_maxsection_pct :  2000
      [libvpx-vp9 @ 0x55ce67b32200] keyframing settings
        kf_mode :                      1
        kf_min_dist :                  0
        kf_max_dist :                  128
      [libvpx-vp9 @ 0x55ce67b32200]
      [libvpx-vp9 @ 0x55ce67b32200] vpx_codec_control
      [libvpx-vp9 @ 0x55ce67b32200]   VP8E_SET_CPUUSED :             1
      [libvpx-vp9 @ 0x55ce67b32200]   VP8E_SET_ARNR_MAXFRAMES :      0
      [libvpx-vp9 @ 0x55ce67b32200]   VP8E_SET_ARNR_STRENGTH :       3
      [libvpx-vp9 @ 0x55ce67b32200]   VP8E_SET_ARNR_TYPE :           3
      [libvpx-vp9 @ 0x55ce67b32200]   VP8E_SET_STATIC_THRESHOLD :    0
      [libvpx-vp9 @ 0x55ce67b32200]   VP9E_SET_COLOR_SPACE :         0
      [libvpx-vp9 @ 0x55ce67b32200]   VP9E_SET_COLOR_RANGE :         0
      [libvpx-vp9 @ 0x55ce67b32200]   VP9E_SET_TARGET_LEVEL :        255
      [libvpx-vp9 @ 0x55ce67b32200] Using deadline : 1000000
      Output #0, webm, to ’output.webm’ :
        Metadata :
          encoder : Lavf57.83.100
          Stream #0:0(eng), 0, 1/1000 : Video : vp9 (libvpx-vp9), 1 reference frame, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 0/1, q=-1—1, 200 kb/s, 23.98 fps, 1k tbn, 23.98 tbc (default)
          Metadata :
            DURATION : 00:00:15.025000000
            encoder : Lavc57.107.100 libvpx-vp9
          Side data :
            cpb : bitrate max/min/avg : 0/0/0 buffer size : 0 vbv_delay : -1
      cur_dts is invalid (this is harmless if it occurs once at the start per stream)
          Last message repeated 120 times
      [out_0_0 @ 0x55ce67ac35a0] EOF on sink link out_0_0:default.
      No more output streams to write to, finishing.
      [webm @ 0x55ce67b2e2a0] get_metadata_duration returned : 15025000
      [webm @ 0x55ce67b2e2a0] Write early duration from recording time = 1000
      [webm @ 0x55ce67b2e2a0] end duration = 0
      [webm @ 0x55ce67b2e2a0] stream 0 end duration = 0
      frame=    0 fps=0.0 q=0.0 Lsize=       1kB time=00:00:00.00 bitrate=N/A speed=   0x
      video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown
      Input file #0 (test.webm) :
        Input stream #0:0 (video) : 120 packets read (1031599 bytes) ; 112 frames decoded ;
        Total : 120 packets (1031599 bytes) demuxed
      Output file #0 (output.webm) :
        Output stream #0:0 (video) : 0 frames encoded ; 0 packets muxed (0 bytes) ;
        Total : 0 packets (0 bytes) muxed
      Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
      112 frames successfully decoded, 0 decoding errors
      [AVIOContext @ 0x55ce67b2e9a0] Statistics : 13 seeks, 9 writeouts
      [AVIOContext @ 0x55ce67a01660] Statistics : 2137508 bytes read, 4 seeks
  

• lavc/h265_profile_level : Add new profiles

  6 mai 2019, par Mark Thompson

  lavc/h265_profile_level : Add new profiles
  Monochrome 10 and Main 10 Still Picture profiles are added by the 2018
  
  version of the standard.
  

  • [DH] libavcodec/h265_profile_level.c

• 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