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• ALSA buffer xrun induced by low quality source in ffmpeg capture

  24 juin 2015, par Peter Becich

  I am attempting to transfer some old Video 8 tapes to my computer, though an EasyCap USB stick and the motherboard’s sound line-in, on Ubuntu. I believe the arguments are correctly laid out below to capture from two independent streams, and encode them both into the output MP4 file.

  Edit :

  I can simplify the question a bit, now.

  ALSA buffer overrun (or underrun ?) is induced by the unreliable/noisy audio source. For instance, if ffmpeg captures the beginning of tape playback, this causes "buffer xrun" far beyond when the tape gets up to speed and playback should be normal.

  It is interesting that the bitrate shown in the ffmpeg log shoots up higher than normal when it’s producing a garbage output ! (Is this bitrate a sum of of audio and video bitrates ?)

  I’ve tried a couple of audio encoding codecs, and had the same problem.

  Using libfdk_aac :

    Metadata:
  
      encoder         : Lavf56.15.102
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 640x480, q=-1--1, 29.97 fps, 11988 tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc56.13.100 libx264
  
      Stream #0:1: Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 48000 Hz, mono, s16, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.13.100 libfdk_aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (libfdk_aac))
  
  [alsa @ 0x22038a0] ALSA buffer xrun.  0kB time=00:00:00.00 bitrate=N/A    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.1934kB time=00:00:02.76 bitrate=5723.5kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.4795kB time=00:00:05.49 bitrate=7150.1kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.7668kB time=00:00:08.21 bitrate=7646.1kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.1475kB time=00:00:10.94 bitrate=8588.9kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.3822kB time=00:00:13.66 bitrate=8289.0kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.5388kB time=00:00:16.38 bitrate=7695.0kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.6896kB time=00:00:19.10 bitrate=7244.0kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.8980kB time=00:00:21.84 bitrate=7118.8kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.2032kB time=00:00:24.55 bitrate=7349.3kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.4612kB time=00:00:27.27 bitrate=7391.1kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.6660kB time=00:00:29.98 bitrate=7284.6kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.9123kB time=00:00:32.68 bitrate=7299.3kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.0641kB time=00:00:35.39 bitrate=7091.7kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.2601kB time=00:00:38.13 bitrate=7002.6kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.5828kB time=00:00:40.87 bitrate=7181.0kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.8481kB time=00:00:43.60 bitrate=7229.9kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.1461kB time=00:00:46.34 bitrate=7328.0kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.3982kB time=00:00:49.06 bitrate=7342.7kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.6565kB time=00:00:51.77 bitrate=7367.8kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.9718kB time=00:00:54.51 bitrate=7471.3kbits/s    
  
  [alsa @ 0x22038a0] ALSA buffer xrun.2341kB time=00:00:57.25 bitrate=7489.2kbits/s    
  
  ^Cframe= 1760 fps= 29 q=-1.0 Lsize=   53946kB time=00:01:00.04 bitrate=7360.3kbits/s    
  
  video:53880kB audio:53kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.022994%
  
  [libx264 @ 0x2217ac0] frame I:8     Avg QP:24.00  size: 55686
  
  [libx264 @ 0x2217ac0] frame P:1752  Avg QP:27.66  size: 31237
  
  [libx264 @ 0x2217ac0] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 0x2217ac0] mb P  I16..4: 15.0%  0.0%  0.0%  P16..4: 80.2%  0.0%  0.0%  0.0%  0.0%    skip: 4.8%
  
  [libx264 @ 0x2217ac0] coded y,uvDC,uvAC intra: 45.3% 86.6% 59.4% inter: 65.7% 81.3% 11.5%
  
  [libx264 @ 0x2217ac0] i16 v,h,dc,p: 40% 25% 26%  9%
  
  [libx264 @ 0x2217ac0] i8c dc,h,v,p: 45% 24% 19% 12%
  
  [libx264 @ 0x2217ac0] kb/s:7516.07
  
  Received signal 2: terminating.

  Using libvorbis :

    Metadata:
  
      encoder         : Lavf56.15.102
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 640x480, q=-1--1, 29.97 fps, 11988 tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc56.13.100 libx264
  
      Stream #0:1: Audio: vorbis (libvorbis) ([221][0][0][0] / 0x00DD), 48000 Hz, mono, fltp, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.13.100 libvorbis
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #1:0 -> #0:1 (pcm_s16le (native) -> vorbis (libvorbis))
  
  [alsa @ 0x1a948a0] ALSA buffer xrun.  0kB time=00:00:00.00 bitrate=N/A    
  
  [alsa @ 0x1a948a0] ALSA buffer xrun. 402kB time=00:00:04.37 bitrate= 752.3kbits/s    
  
  [alsa @ 0x1a948a0] ALSA buffer xrun.4122kB time=00:00:08.80 bitrate=3833.0kbits/s    
  
  [alsa @ 0x1a948a0] ALSA buffer xrun.8722kB time=00:00:13.14 bitrate=5436.3kbits/s    
  
  [alsa @ 0x1a948a0] ALSA buffer xrun.3903kB time=00:00:17.51 bitrate=6502.2kbits/s    
  
  [alsa @ 0x1a948a0] ALSA buffer xrun.6625kB time=00:00:21.89 bitrate=6221.4kbits/s    
  
  [alsa @ 0x1a948a0] ALSA buffer xrun.9548kB time=00:00:26.28 bitrate=6092.5kbits/s    
  
  ^Cframe=  851 fps= 26 q=-1.0 Lsize=   22018kB time=00:00:30.69 bitrate=5875.3kbits/s    
  
  video:21996kB audio:12kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead: 0.044897%
  
  [libx264 @ 0x1aa8ac0] frame I:4     Avg QP:23.50  size: 62405
  
  [libx264 @ 0x1aa8ac0] frame P:847   Avg QP:25.58  size: 26297
  
  [libx264 @ 0x1aa8ac0] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 0x1aa8ac0] mb P  I16..4: 13.2%  0.0%  0.0%  P16..4: 72.0%  0.0%  0.0%  0.0%  0.0%    skip:14.8%
  
  [libx264 @ 0x1aa8ac0] coded y,uvDC,uvAC intra: 40.6% 81.0% 58.6% inter: 58.8% 72.7% 8.6%
  
  [libx264 @ 0x1aa8ac0] i16 v,h,dc,p: 41% 28% 22%  9%
  
  [libx264 @ 0x1aa8ac0] i8c dc,h,v,p: 54% 19% 16% 11%
  
  [libx264 @ 0x1aa8ac0] kb/s:6345.60
  
  Received signal 2: terminating.

  ---

  ffmpeg’s detection of the ALSA stream is seemingly goofed up by the inconsistencies of the tape. In the failure case, only short blips of the tapes audio exist in the output MP4. The audio bitrate of the output file is less than 10 kbps, averaged out across the whole file. The output video seems to be fine, even though the low frames-per-second in the failure case log below.

  The audio and video streams can be captured fine for short amounts of time before a source error occurs ; this provides the success case log. The failure case log was created by intentionally making an error in the source streams — turning on the camera makes a brief noisy signal.

  Is there a setting that needs to be forced to keep ffmpeg recording the audio stream, even when the tape is blank or noisy ?

  Could it be that the libfdk_aac audio encoder is tripped up by the low quality source ?

  The relevant line ; rawvideo stream is piped to this in script at bottom :

  ffmpeg -pixel_format uyvy422 -s:v 720x480 -framerate 29.97 -f rawvideo \
  
  -i $PIPE  -f alsa -i hw:0,0 -vf scale=w=720:h=540 -vcodec libx264 \
  
  -preset ultrafast -shortest -c:a libfdk_aac -b:a 128k -af pan=1:c0=c0  \
  
  -ar 96000 $OUTFILE

  The ar argument was one attempt to force recording.

  ffmpeg log file for (short-lived) success ; high frames-per-second captured :

  ffmpeg version 2.5.3 Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Jan 11 2015 17:53:45 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, rawvideo, from '/tmp/somagic-pipe':
  
    Duration: N/A, start: 0.000000, bitrate: 165722 kb/s
  
      Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x480, 165722 kb/s, 29.97 tbr, 29.97 tbn, 29.97 tbc
  
  Home directory not accessible: Permission denied
  
  Guessed Channel Layout for  Input Stream #1.0 : stereo
  
  Input #1, alsa, from 'hw:0,0':
  
    Duration: N/A, start: 1423202268.577088, bitrate: 1536 kb/s
  
      Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  
  No pixel format specified, yuv422p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [Parsed_pan_0 @ 0x3335d60] This syntax is deprecated. Use '|' to separate the list items.
  
  Single channel layout '1' is interpreted as a number of channels, switch to the syntax '1c' otherwise it will be interpreted as a channel layout number in a later version
  
  [Parsed_pan_0 @ 0x3335d60] Pure channel mapping detected: 0
  
  [libx264 @ 0x3364bc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
  
  [libx264 @ 0x3364bc0] profile High 4:2:2, level 3.1, 4:2:2 8-bit
  
  [libx264 @ 0x3364bc0] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=3 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, mp4, to '/home/peterbecich/easycap/Videos/fpv_video_02_05_2015_21_57_48.mp4':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 720x540, q=-1--1, 29.97 fps, 11988 tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc56.13.100 libx264
  
      Stream #0:1: Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 96000 Hz, mono, s16, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.13.100 libfdk_aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (libfdk_aac))
  
  Press [q] to stop, [?] for help
  
  frame=   13 fps=0.0 q=26.0 size=     187kB time=00:00:00.30 bitrate=5102.7kbits/s    
  
  frame=   29 fps= 29 q=26.0 size=     469kB time=00:00:00.83 bitrate=4607.6kbits/s    
  
  frame=   44 fps= 29 q=26.0 size=     755kB time=00:00:01.33 bitrate=4635.2kbits/s    
  
  frame=   59 fps= 29 q=26.0 size=    1024kB time=00:00:01.83 bitrate=4572.1kbits/s    
  
  frame=   74 fps= 29 q=26.0 size=    1279kB time=00:00:02.33 bitrate=4486.5kbits/s    
  
  frame=   89 fps= 29 q=26.0 size=    1516kB time=00:00:02.83 bitrate=4378.0kbits/s    
  
  frame=  104 fps= 29 q=26.0 size=    1752kB time=00:00:03.33 bitrate=4301.0kbits/s    
  
  frame=  119 fps= 29 q=26.0 size=    1991kB time=00:00:03.83 bitrate=4251.1kbits/s    
  
  frame=  135 fps= 30 q=26.0 size=    2245kB time=00:00:04.37 bitrate=4207.5kbits/s    
  
  frame=  150 fps= 30 q=26.0 size=    2524kB time=00:00:04.87 bitrate=4245.0kbits/s    
  
  frame=  165 fps= 30 q=26.0 size=    2808kB time=00:00:05.37 bitrate=4282.0kbits/s    
  
  frame=  180 fps= 30 q=26.0 size=    3091kB time=00:00:05.87 bitrate=4311.5kbits/s    
  
  [rawvideo @ 0x3350640] Invalid buffer size, packet size 65536 < expected frame_size 691200
  
  Error while decoding stream #0:0: Invalid argument
  
  frame=  183 fps= 29 q=-1.0 Lsize=    3247kB time=00:00:06.11 bitrate=4351.5kbits/s    
  
  video:3142kB audio:96kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.254788%
  
  [libx264 @ 0x3364bc0] frame I:1     Avg QP:20.00  size:  2289
  
  [libx264 @ 0x3364bc0] frame P:182   Avg QP:25.99  size: 17664
  
  [libx264 @ 0x3364bc0] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 0x3364bc0] mb P  I16..4: 78.5%  0.0%  0.0%  P16..4: 20.2%  0.0%  0.0%  0.0%  0.0%    skip: 1.4%
  
  [libx264 @ 0x3364bc0] coded y,uvDC,uvAC intra: 84.1% 71.5% 18.9% inter: 51.9% 63.5% 0.4%
  
  [libx264 @ 0x3364bc0] i16 v,h,dc,p: 15%  8% 69%  8%
  
  [libx264 @ 0x3364bc0] i8c dc,h,v,p: 50% 19% 24%  7%
  
  [libx264 @ 0x3364bc0] kb/s:4215.02

  ffmpeg log for failure ; low FPS captured :

  ffmpeg version 2.5.3 Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Jan 11 2015 17:53:45 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, rawvideo, from '/tmp/somagic-pipe':
  
    Duration: N/A, start: 0.000000, bitrate: 165722 kb/s
  
      Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x480, 165722 kb/s, 29.97 tbr, 29.97 tbn, 29.97 tbc
  
  Home directory not accessible: Permission denied
  
  Guessed Channel Layout for  Input Stream #1.0 : stereo
  
  Input #1, alsa, from 'hw:0,0':
  
    Duration: N/A, start: 1423201999.226455, bitrate: 1536 kb/s
  
      Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  
  No pixel format specified, yuv422p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [Parsed_pan_0 @ 0x21cad60] This syntax is deprecated. Use '|' to separate the list items.
  
  Single channel layout '1' is interpreted as a number of channels, switch to the syntax '1c' otherwise it will be interpreted as a channel layout number in a later version
  
  [Parsed_pan_0 @ 0x21cad60] Pure channel mapping detected: 0
  
  [libx264 @ 0x21f9bc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
  
  [libx264 @ 0x21f9bc0] profile High 4:2:2, level 3.1, 4:2:2 8-bit
  
  [libx264 @ 0x21f9bc0] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=3 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, mp4, to '/home/peterbecich/easycap/Videos/fpv_video_02_05_2015_21_53_18.mp4':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 720x540, q=-1--1, 29.97 fps, 11988 tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc56.13.100 libx264
  
      Stream #0:1: Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 96000 Hz, mono, s16, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.13.100 libfdk_aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (libfdk_aac))
  
  Press [q] to stop, [?] for help
  
  frame=    1 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
  
  frame=    1 fps=1.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
  
  frame=    1 fps=0.7 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
  
  frame=    1 fps=0.5 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
  
  frame=    1 fps=0.4 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
  
  frame=    1 fps=0.3 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
  
  frame=    1 fps=0.3 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
  
  frame=    1 fps=0.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
  
  frame=    1 fps=0.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
  
  frame=    1 fps=0.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
  
  frame=    1 fps=0.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
  
  [alsa @ 0x21e5ac0] ALSA buffer xrun.
  
  frame=    8 fps=1.3 q=19.0 size=      12kB time=00:00:06.03 bitrate=  15.9kbits/s    
  
  frame=   23 fps=3.5 q=18.0 size=      12kB time=00:00:06.03 bitrate=  16.4kbits/s    
  
  frame=   38 fps=5.4 q=18.0 size=      12kB time=00:00:06.03 bitrate=  16.7kbits/s    
  
  frame=   53 fps=7.0 q=18.0 size=      12kB time=00:00:06.03 bitrate=  16.9kbits/s    
  
  frame=   68 fps=8.4 q=26.0 size=     146kB time=00:00:06.03 bitrate= 198.8kbits/s    
  
  frame=   83 fps=9.7 q=26.0 size=     375kB time=00:00:06.03 bitrate= 510.0kbits/s    
  
  frame=   98 fps= 11 q=26.0 size=     608kB time=00:00:06.03 bitrate= 826.5kbits/s    
  
  frame=  114 fps= 12 q=26.0 size=     875kB time=00:00:06.03 bitrate=1189.1kbits/s    
  
  frame=  128 fps= 13 q=26.0 size=    1091kB time=00:00:06.03 bitrate=1481.6kbits/s    
  
  frame=  144 fps= 14 q=26.0 size=    1339kB time=00:00:06.03 bitrate=1819.2kbits/s    
  
  frame=  159 fps= 14 q=26.0 size=    1571kB time=00:00:06.03 bitrate=2134.6kbits/s    
  
  frame=  174 fps= 15 q=26.0 size=    1796kB time=00:00:06.03 bitrate=2440.1kbits/s    
  
  [alsa @ 0x21e5ac0] ALSA buffer xrun.
  
  frame=  189 fps= 16 q=26.0 size=    2015kB time=00:00:12.04 bitrate=1370.4kbits/s    
  
  frame=  204 fps= 16 q=26.0 size=    2238kB time=00:00:12.04 bitrate=1522.3kbits/s    
  
  frame=  219 fps= 17 q=26.0 size=    2490kB time=00:00:12.04 bitrate=1694.2kbits/s    
  
  frame=  235 fps= 17 q=26.0 size=    2728kB time=00:00:12.04 bitrate=1855.8kbits/s    
  
  frame=  250 fps= 18 q=26.0 size=    2973kB time=00:00:12.04 bitrate=2022.4kbits/s    
  
  [rawvideo @ 0x21e5640] Invalid buffer size, packet size 65536 < expected frame_size 691200
  
  Error while decoding stream #0:0: Invalid argument
  
  frame=  261 fps= 18 q=-1.0 Lsize=    3269kB time=00:00:12.06 bitrate=2220.1kbits/s    
  
  video:3263kB audio:4kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.081101%
  
  [libx264 @ 0x21f9bc0] frame I:2     Avg QP:21.50  size: 21342
  
  [libx264 @ 0x21f9bc0] frame P:259   Avg QP:24.22  size: 12734
  
  [libx264 @ 0x21f9bc0] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 0x21f9bc0] mb P  I16..4: 62.8%  0.0%  0.0%  P16..4: 14.2%  0.0%  0.0%  0.0%  0.0%    skip:22.9%
  
  [libx264 @ 0x21f9bc0] coded y,uvDC,uvAC intra: 77.7% 61.2% 14.1% inter: 19.7% 24.8% 1.6%
  
  [libx264 @ 0x21f9bc0] i16 v,h,dc,p: 17% 10% 65%  8%
  
  [libx264 @ 0x21f9bc0] i8c dc,h,v,p: 52% 18% 24%  6%
  
  [libx264 @ 0x21f9bc0] kb/s:3068.90

  The whole script :

  #!/bin/sh
  
  
  
  PIPE=/tmp/somagic-pipe
  
  OUTFILEDIR=~/easycap/Videos/
  
  LOGDIR=~/.somagic-log/
  
  NOW=`date +"%m_%d_%Y_%H_%M_%S"`
  
  
  
  OUTFILE=${OUTFILEDIR}fpv_video_${NOW}.mp4
  
  
  
  mkdir $LOGDIR
  
  
  
  FFMPEG_LOG=${LOGDIR}ffmpeg.log
  
  SOMAGIC_LOG=${LOGDIR}somagic.log
  
  MPLAYER_LOG=${LOGDIR}mplayer.log
  
  
  
  rm $PIPE >/dev/null 2>&1
  
  rm $OUTFILE >/dev/null 2>&1
  
  
  
  rm $FFMPEG_LOG
  
  rm $SOMAGIC_LOG
  
  rm $MPLAYER_LOG
  
  
  
  mkfifo $PIPE >/dev/null 2>&1
  
  
  
  ffmpeg -pixel_format uyvy422 -s:v 720x480 -framerate 29.97 -f rawvideo \
  
  -i $PIPE  -f alsa -i hw:0,0 -vf scale=w=720:h=540 -vcodec libx264 \
  
  -preset ultrafast -shortest -c:a libfdk_aac -b:a 128k -af pan=1:c0=c0  \
  
  -ar 96000 $OUTFILE > $FFMPEG_LOG 2>&1 &
  
  
  
  somagic-capture --ntsc -c --luminance=2 --lum-aperture=3 2> $SOMAGIC_LOG \
  
  | tee $PIPE | \
  
  mplayer -vf yadif,screenshot -demuxer rawvideo -rawvideo \
  
  "ntsc:format=uyvy:fps=30000/1001" -aspect 4:3 - 2> $MPLAYER_LOG
  
  
  
  
  
  rm $PIPE >/dev/null 2>&1 

  Modified from here : https://gist.github.com/Brick85/0b327ac2d3d45e23ed33

• Build FFMPEG on MAC with my own license

  16 février 2015, par Ashish

  I am new in ffmpeg world. I want to build the ffmpeg exe on MAC os using its binary source. I have tried to build the exe and infact i succeeded in compiling exe but when i run that exe i got this line :

  ffmpeg version 2.2.4 Copyright (c) 2000-2014 the FFmpeg developers

  While surfing on internet i got an exe with different copyright holder. I also want to change that "the FFmpeg developer" with with my name. Please help me out how to do this ?
  Thanks.

• Using ffmpeg on Windows, what is the command to capture hardware encoded H264 stream from Logitech c930e

  2 mai 2015, par Jeff

  I am using ffmpeg on Windows 8 and I would like to capture the built-in H264 hardware encoded stream from the Logitech c930e camera. The H264 built-in encoded stream is part of the UVC 1.5 interface.

  Using this command I have noticed that the c930e exposes two video pins through DirectShow : 0 and 1.

  ffmpeg -report -list_options true -f dshow -i video="Logitech Webcam C930e"

  [dshow @ 0000000002d89360]  Pin "Capture" (alternative pin name "0")

  [dshow @ 0000000002d89360]  Pin "Capture" (alternative pin name "1")

  It doesn’t seem to matter if I choose Pin 0 or 1, I still get raw video from the Logitech c930e webcam. On Linux, the supposed command involves v4l2, but this does not appear to exist in the default Windows version of ffmpeg from http://ffmpeg.zeranoe.com/builds/

  Does the default Windows build of ffmpeg support the direct capture of the UVC interface ?

  This is the closest I have gotten on this journey, but still isn’t quite right :

  ffmpeg -report -f dshow -i video="Logitech Webcam C930e" -s 1920x1080 -r 30 -video_pin_name 1 -vcodec H264 -c copy -f mp4 Logitechc930eFeed.mp4

  As of April 17, 2015 I am still trying to figure this out and have two new pieces of info.

  I found this interesting article on Logitech’s website instructing the user to change the default Logitech driver to the generic USB Video Device driver :
  https://support.logitech.com/en_us/article/Install-native-UVC-drivers-for-your-Logitech-webcam?product=a0qi00000069v0MAAQ#

  I also found that my C930e had an older firmware (8.0.866), and Logitech recommends updating the firmware to 8.0.875 to fix an unspecified UVC H.264 issue.

  So now I have the latest firmware, and am using the generic "USB Video Device" on Windows 8.1.

  ffmpeg -list_devices true -f dshow -i

  which gives this output :

  ffmpeg version N-69608-g9dc45d1 Copyright (c) 2000-2015 the FFmpeg developers
 built with gcc 4.9.2 (GCC)
 configuration: --enable-gpl --enable-version3 --disable-w32threads --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-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
 libavutil      54. 18.100 / 54. 18.100
 libavcodec     56. 21.102 / 56. 21.102
 libavformat    56. 19.100 / 56. 19.100
 libavdevice    56.  4.100 / 56.  4.100
 libavfilter     5.  9.103 /  5.  9.103
 libswscale      3.  1.101 /  3.  1.101
 libswresample   1.  1.100 /  1.  1.100
 libpostproc    53.  3.100 / 53.  3.100
[dshow @ 00000000045c9360] DirectShow video devices (some may be both video and audio devices)
[dshow @ 00000000045c9360]  "Logitech Webcam C930e"
[dshow @ 00000000045c9360]     Alternative name "@device_pnp_\\?\usb#vid_046d&pid_0843&mi_00#7&3693c0e6&1&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 00000000045c9360] DirectShow audio devices
[dshow @ 00000000045c9360]  "Microphone (Logitech Webcam C930e)"
[dshow @ 00000000045c9360]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{BB8BE70B-4DDC-465F-9247-86E6EC98D627}"
dummy: Immediate exit requested

  And this command :
  ffmpeg -list_options true -f dshow -i video="Logitech Webcam C930e"

  still gives this output :

  ffmpeg version N-69608-g9dc45d1 Copyright (c) 2000-2015 the FFmpeg developers
 built with gcc 4.9.2 (GCC)
 configuration: --enable-gpl --enable-version3 --disable-w32threads --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-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
 libavutil      54. 18.100 / 54. 18.100
 libavcodec     56. 21.102 / 56. 21.102
 libavformat    56. 19.100 / 56. 19.100
 libavdevice    56.  4.100 / 56.  4.100
 libavfilter     5.  9.103 /  5.  9.103
 libswscale      3.  1.101 /  3.  1.101
 libswresample   1.  1.100 /  1.  1.100
 libpostproc    53.  3.100 / 53.  3.100
[dshow @ 0000000004469360] DirectShow video device options (from video devices)
[dshow @ 0000000004469360]  Pin "Capture" (alternative pin name "0")
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=800x600 fps=5 max s=800x600 fps=24
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=800x600 fps=5 max s=800x600 fps=24
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=960x540 fps=5 max s=960x540 fps=15
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=960x540 fps=5 max s=960x540 fps=15
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1024x576 fps=5 max s=1024x576 fps=15
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1024x576 fps=5 max s=1024x576 fps=15
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1280x720 fps=5 max s=1280x720 fps=10
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1280x720 fps=5 max s=1280x720 fps=10
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1600x896 fps=5 max s=1600x896 fps=7.5
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1600x896 fps=5 max s=1600x896 fps=7.5
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1920x1080 fps=5 max s=1920x1080 fps=5
[dshow @ 0000000004469360]   pixel_format=yuyv422  min s=1920x1080 fps=5 max s=1920x1080 fps=5
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=640x480 fps=5 max s=640x480 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=160x120 fps=5 max s=160x120 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=176x144 fps=5 max s=176x144 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=320x180 fps=5 max s=320x180 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=320x240 fps=5 max s=320x240 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=352x288 fps=5 max s=352x288 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=424x240 fps=5 max s=424x240 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=480x270 fps=5 max s=480x270 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=640x360 fps=5 max s=640x360 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=800x448 fps=5 max s=800x448 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=800x600 fps=5 max s=800x600 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=800x600 fps=5 max s=800x600 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=848x480 fps=5 max s=848x480 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=960x540 fps=5 max s=960x540 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=960x540 fps=5 max s=960x540 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1024x576 fps=5 max s=1024x576 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1024x576 fps=5 max s=1024x576 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1280x720 fps=5 max s=1280x720 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1280x720 fps=5 max s=1280x720 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1600x896 fps=5 max s=1600x896 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1600x896 fps=5 max s=1600x896 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1920x1080 fps=5 max s=1920x1080 fps=30
[dshow @ 0000000004469360]   vcodec=mjpeg  min s=1920x1080 fps=5 max s=1920x1080 fps=30
[dshow @ 0000000004469360]  Pin "Capture" (alternative pin name "1")
video=Logitech Webcam C930e: Immediate exit requested