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• Why calling libav* library doesn't have same quality as ffmpeg command line ?

  10 mai 2016, par seaguest

  I am using the ffmpeg 3 to do the video format conversion, it works fine when I use the command line mode, but when I call the libav* library, I get a audio quality loss problem (there is a lot of noises in the audio).

  Here are the two files :

  mv.webm - original file
  mv2.mp4 converted with libarary , a lot of noises

  Here is the probe information for the mv.webm :

  $ ffprobe mv.webm
  
  ffprobe version N-79826-g64fd62d Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 5.3.1 (Ubuntu 5.3.1-14ubuntu2) 20160413
  
    configuration: --prefix=/home/seaguest/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/seaguest/ffmpeg_build/include --extra-ldflags=-L/home/seaguest/ffmpeg_build/lib --enable-gpl --enable-libfdk-aac --enable-libx264 --enable-libx265 --enable-nonfree
  
    libavutil      55. 24.100 / 55. 24.100
  
    libavcodec     57. 39.100 / 57. 39.100
  
    libavformat    57. 36.100 / 57. 36.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 45.100 /  6. 45.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, matroska,webm, from 'mv.webm':
  
    Metadata:
  
      encoder         : Lavf57.36.100
  
    Duration: 00:00:30.00, start: 0.000000, bitrate: 935 kb/s
  
      Stream #0:0: Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 25 fps, 25 tbr, 1k tbn (default)
  
      Stream #0:1: Audio: vorbis, 44100 Hz, stereo, fltp (default)

  I checked the log printed by command line mode and calling code mode, the setting looks like the same, here are the logs :

  $ ffmpeg -i mv.webm -c:a aac -c:v libx264  mv.mp4
  
  ffmpeg version N-79826-g64fd62d Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.3.1 (Ubuntu 5.3.1-14ubuntu2) 20160413
  
    configuration: --prefix=/home/seaguest/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/seaguest/ffmpeg_build/include --extra-ldflags=-L/home/seaguest/ffmpeg_build/lib --enable-gpl --enable-libfdk-aac --enable-libx264 --enable-libx265 --enable-nonfree
  
    libavutil      55. 24.100 / 55. 24.100
  
    libavcodec     57. 39.100 / 57. 39.100
  
    libavformat    57. 36.100 / 57. 36.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 45.100 /  6. 45.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, matroska,webm, from 'mv.webm':
  
    Metadata:
  
      encoder         : Lavf57.36.100
  
    Duration: 00:00:30.00, start: 0.000000, bitrate: 935 kb/s
  
      Stream #0:0: Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 25 fps, 25 tbr, 1k tbn (default)
  
      Stream #0:1: Audio: vorbis, 44100 Hz, stereo, fltp (default)
  
  [libx264 @ 0x3e5d880] using SAR=1/1
  
  [libx264 @ 0x3e5d880] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x3e5d880] profile High, level 3.0
  
  [libx264 @ 0x3e5d880] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=25 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
  
  [mp4 @ 0x3e2f680] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
      Last message repeated 1 times
  
  Output #0, mp4, to 'mv.mp4':
  
    Metadata:
  
      encoder         : Lavf57.36.100
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 25 fps, 12800 tbn (default)
  
      Metadata:
  
        encoder         : Lavc57.39.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc57.39.100 aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (vp8 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (vorbis (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  frame=  750 fps=229 q=-1.0 Lsize=    2508kB time=00:00:30.02 bitrate= 684.5kbits/s speed=9.17x
  
  video:2023kB audio:459kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.052857%
  
  [libx264 @ 0x3e5d880] frame I:11    Avg QP:15.29  size: 20395
  
  [libx264 @ 0x3e5d880] frame P:345   Avg QP:20.93  size:  4350
  
  [libx264 @ 0x3e5d880] frame B:394   Avg QP:23.55  size:   879
  
  [libx264 @ 0x3e5d880] consecutive B-frames: 25.2%  3.2% 33.2% 38.4%
  
  [libx264 @ 0x3e5d880] mb I  I16..4: 44.1% 32.5% 23.4%
  
  [libx264 @ 0x3e5d880] mb P  I16..4:  1.5%  3.6%  0.6%  P16..4: 28.9% 11.2%  4.7%  0.0%  0.0%    skip:49.5%
  
  [libx264 @ 0x3e5d880] mb B  I16..4:  0.0%  0.1%  0.0%  B16..8: 27.4%  2.0%  0.4%  direct: 0.8%  skip:69.3%  L0:40.0% L1:53.3% BI: 6.7%
  
  [libx264 @ 0x3e5d880] 8x8 transform intra:52.6% inter:74.9%
  
  [libx264 @ 0x3e5d880] coded y,uvDC,uvAC intra: 57.5% 68.6% 35.9% inter: 10.6% 11.9% 2.6%
  
  [libx264 @ 0x3e5d880] i16 v,h,dc,p: 36% 42%  7% 15%
  
  [libx264 @ 0x3e5d880] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 23% 15% 6%  7%  7% 10%  7% 10%
  
  [libx264 @ 0x3e5d880] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 27% 14% 6%  8%  7%  7%  6%  6%
  
  [libx264 @ 0x3e5d880] i8c dc,h,v,p: 46% 34% 11%  9%
  
  [libx264 @ 0x3e5d880] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x3e5d880] ref P L0: 63.9% 20.8% 11.2%  4.1%
  
  [libx264 @ 0x3e5d880] ref B L0: 93.1%  6.1%  0.8%
  
  [libx264 @ 0x3e5d880] ref B L1: 95.8%  4.2%
  
  [libx264 @ 0x3e5d880] kb/s:552.32
  
  [aac @ 0x3e5ec00] Qavg: 3030.804
  
  
  
  
  
  $ ffprobe mv.mp4
  
  ffprobe version N-79826-g64fd62d Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 5.3.1 (Ubuntu 5.3.1-14ubuntu2) 20160413
  
    configuration: --prefix=/home/seaguest/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/seaguest/ffmpeg_build/include --extra-ldflags=-L/home/seaguest/ffmpeg_build/lib --enable-gpl --enable-libfdk-aac --enable-libx264 --enable-libx265 --enable-nonfree
  
    libavutil      55. 24.100 / 55. 24.100
  
    libavcodec     57. 39.100 / 57. 39.100
  
    libavformat    57. 36.100 / 57. 36.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 45.100 /  6. 45.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mv.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.36.100
  
    Duration: 00:00:30.01, start: 0.000000, bitrate: 684 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 552 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  For the calling code mode :

  $ go run transcode.go mv.webm mv1.mp4
  
  # github.com/3d0c/gmf
  
  ../packet.go: In function ‘_cgo_3c42eeb63b1e_Cfunc_avcodec_decode_audio4’:
  
  ../packet.go:87:2: warning: ‘avcodec_decode_audio4’ is deprecated [-Wdeprecated-declarations]
  
   func (this *Packet) decode(cc *CodecCtx, frame *Frame) (*Frame, bool, int, error) {
  
    ^
  
  In file included from ../packet.go:7:0:
  
  /home/seaguest/ffmpeg_build/include/libavcodec/avcodec.h:4685:5: note: declared here
  
   int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
  
       ^
  
  ../packet.go: In function ‘_cgo_3c42eeb63b1e_Cfunc_avcodec_decode_video2’:
  
  ../packet.go:104:2: warning: ‘avcodec_decode_video2’ is deprecated [-Wdeprecated-declarations]
  
     }
  
    ^
  
  In file included from ../packet.go:7:0:
  
  /home/seaguest/ffmpeg_build/include/libavcodec/avcodec.h:4734:5: note: declared here
  
   int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
  
       ^
  
  [libx264 @ 0x2d82400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x2d82400] profile High, level 3.0
  
  [libx264 @ 0x2d82400] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=25 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
  
  [mp4 @ 0x2d480c0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
  
  [mp4 @ 0x2d480c0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  [mp4 @ 0x2d480c0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
  
  [mp4 @ 0x2d480c0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  
  
  
  
  
  
  $ ffprobe mv1.mp4
  
  ffprobe version N-79826-g64fd62d Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 5.3.1 (Ubuntu 5.3.1-14ubuntu2) 20160413
  
    configuration: --prefix=/home/seaguest/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/seaguest/ffmpeg_build/include --extra-ldflags=-L/home/seaguest/ffmpeg_build/lib --enable-gpl --enable-libfdk-aac --enable-libx264 --enable-libx265 --enable-nonfree
  
    libavutil      55. 24.100 / 55. 24.100
  
    libavcodec     57. 39.100 / 57. 39.100
  
    libavformat    57. 36.100 / 57. 36.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 45.100 /  6. 45.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mv1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.36.100
  
    Duration: 00:00:30.00, start: 0.000000, bitrate: 751 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x480, 613 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  Checking the setting section, crf=23.0 for both (the rest are exactly the same), but the output bitrate are different (the audio for calling code mode has a lot of noises), how is that possible ?

  Why the command line mode and use libav* library mode with same setting, but have different output ?
  What should I do to call libav* library to get lossless video conversion ?

• distorted video during ffmpeg h264 video with audio recording

  16 mars 2018, par Developer

  I am continuously recording a video with audio from an ip camera using ffmpeg. I am getting a distorted video when I get in to the picture. If the background is still, the video looks normal, but as soon as I step in to the picture, I see myself only being distorted while the background stays intact. If anyone went through this issue, I would really appreciate your help. Here is a command that I am using :

  ffmpeg -i rtsp://admin:admin@192.168.1.9/mpeg4 -map 0 -c:v libx264 -c:a aac -pix_fmt yuv420p -f segment -segment_time 60 -segment_wrap 10 -reset_timestamps 1 %d.mp4

  This is a ffmpeg command output :

  ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
  
  
  
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  
  
  
   configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma --enable-nonfree
  
  
  
  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

  Guessed Channel Layout for Input Stream #0.1 : mono

  Input #0, rtsp, from 'rtsp://admin:admin@192.168.1.9/mpeg4':

  Metadata :

  title           : My MPEG4 Session
  
  
  
  comment         : My MPEG4 info

  Duration : N/A, start : 0.000000, bitrate : N/A

  Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 30 tbr, 90k tbn, 30k tbc
  
  
  
  Stream #0:1: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s

  Stream mapping :

  Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))
  
  
  
  Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
  
  
  
  Press [q] to stop, [?] for help
  
  
  
  [aac @ 0x7fc303000600] Too many bits 8832.000000 > 6144 per frame requested, clamping to max
  
  
  
  [libx264 @ 0x7fc301846800] using SAR=1/1
  
  
  
  [libx264 @ 0x7fc301846800] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  
  
  [libx264 @ 0x7fc301846800] profile High, level 3.0
  
  
  
  [libx264 @ 0x7fc301846800] 264 - core 148 r2795 aaa9aa8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=25 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
  
  
  
  [segment @ 0x7fc301844400] Opening '0.mp4' for writing

  Output #0, segment, to ’%d.mp4’ :

  Metadata :

  title           : My MPEG4 Session
  
  
  
  comment         : My MPEG4 info
  
  
  
  encoder         : Lavf57.83.100
  
  
  
  Stream #0:0: Video: h264 (libx264), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 30 fps, 15360 tbn, 30 tbc
  
  
  
  Metadata:
  
  
  
    encoder         : Lavc57.107.100 libx264
  
  
  
  Side data:
  
  
  
    cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  
  
  Stream #0:1: Audio: aac (LC), 8000 Hz, mono, fltp, 48 kb/s
  
  
  
  Metadata:
  
  
  
    encoder         : Lavc57.107.100 aac
  
  
  
  frame=   57 fps=0.0 q=29.0 size=N/A time=00:00:02.04 bitrate=N/A dup=22 drop=0 sframe=   73 fps= 68 q=29.0 size=N/A time=00:00:02.56 bitrate=N/A dup=22 drop=0 s
  
  
  
  frame=   89 fps= 54 q=29.0 size=N/A time=00:00:03.07 bitrate=N/A dup=22 drop=0 sframe=  106 fps= 48 q=29.0 size=N/A time=00:00:03.58 bitrate=N/A dup=22 drop=0 s
  
  
  
  frame=  122 fps= 45 q=29.0 size=N/A time=00:00:04.09 bitrate=N/A dup=22 drop=0 sframe=  137 fps= 42 q=29.0 size=N/A time=00:00:04.48 bitrate=N/A dup=22 drop=0 s
  
  
  
  frame=  151 fps= 40 q=29.0 size=N/A time=00:00:04.97 bitrate=N/A dup=22 drop=0 s
  
  
  
  frame=  156 fps= 37 q=-1.0 Lsize=N/A time=00:00:05.48 bitrate=N/A dup=22 drop=0 speed= 1.3x  

  Update : It works fine in vlc player. I am adding a link to the destorted video : https://drive.google.com/file/d/1QCc7XUbePBI3v1h0sNQgU0guHA2AwgRT/view?usp=sharing

• FFMPEG problems with real-time buffer

  27 juin 2024, par Charles Kiel

  I'm trying to use FFMPEG (Windows) to encode a stream from a video capture card via dshow and send to a RTMP server. THis is my command line ;

  



      ffmpeg -f dshow -i video="AVerMedia BDA Analog Capture Secondary":audio="Microphone (6- C-Media USB Audi" -vf scale=1280:720 -vcodec libx264 -r 30 -rtbufsize 702000k -acodec mp3 -ac 2 -ar 44100 -ab 128k -pix_fmt yuv420p -tune zerolatency -preset ultrafast -f flv "rtmp://xxx.xxx.xxx.xxx/stream/key"        ffmpeg version N-86950-g1bef008 Copyright (c) 2000-2017 the FFmpeg developers
    built with gcc 7.1.0 (GCC)
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable
    -libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspe
    ex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
    libavutil      55. 70.100 / 55. 70.100
    libavcodec     57.102.100 / 57.102.100
    libavformat    57. 76.100 / 57. 76.100
    libavdevice    57.  7.100 / 57.  7.100
    libavfilter     6. 98.100 /  6. 98.100
    libswscale      4.  7.102 /  4.  7.102
    libswresample   2.  8.100 /  2.  8.100
    libpostproc    54.  6.100 / 54.  6.100
    Guessed Channel Layout for Input Stream #0.1 : stereo
    Input #0, dshow, from 'video=AVerMedia BDA Analog Capture Secondary:audio=Microphone (6- C-Media USB Audi':
    Duration: N/A, start: 2035.202000, bitrate: N/A
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 720x480, 29.97 fps, 29.97 tbr, 10000k tbn, 10000k tbc
    Stream #0:1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
    [dshow @ 00000000005f90e0] real-time buffer [AVerMedia BDA Analog Capture Secondary] [video input] too full or near too full (68% of size: 3041280 [rtbufsize parameter])! frame dropped!
    [dshow @ 00000000005f90e0] real-time buffer [AVerMedia BDA Analog Capture Secondary] [video input] too full or near too full (90% of size: 3041280 [rtbufsize parameter])! frame dropped!
    [dshow @ 00000000005f90e0] real-time buffer [AVerMedia BDA Analog Capture Secondary] [video input] too full or near too full (113% of size: 3041280 [rtbufsize parameter])! frame dropped!
    Last message repeated 46 times
    Stream mapping:
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
    Stream #0:1 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))
    Press [q] to stop, [?] for help
    [dshow @ 00000000005f90e0] real-time buffer [AVerMedia BDA Analog Capture Secondary] [video input] too full or near too full (113% of size: 3041280 [rtbufsize parameter])! frame dropped!
    [libx264 @ 0000000005b16640] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
    [libx264 @ 0000000005b16640] profile Constrained Baseline, level 3.1
    [libx264 @ 0000000005b16640] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=2
    1,11 fast_pskip=1 chroma_qp_offset=0 threads=11 lookahead_threads=11 sliced_threads=1 slices=11 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_ra
    tio=1.40 aq=0
    [dshow @ 00000000005f90e0] real-time buffer [AVerMedia BDA Analog Capture Secondary] [video input] too full or near too full (113% of size: 3041280 [rtbufsize parameter])! frame dropped!
    Past duration 0.999992 too large


  



  The buffer too full message are non-stop. I can use Open Broadcast Software (OBS) and stream with no problem (I'm pretty sure it also uses ffmpeg), so I'm doing something wrong.