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• Logic and lawyers

  22 mai 2013, par Mans — Law and liberty

  Reading about various patent litigation cases, I am struck by the frequency with which common logical fallacies such as the Appeal to Consequences are committed. We shall look at a couple of recent examples. In conjunction with the Federal Circuit ruling in CLS Bank v. Alice Corp., Judge Moore, joined … Continue reading →

• Huffman table decode error with FFmpeg

  22 janvier 2018, par subha

  I am able to build FFmpeg older versions using Visual Studio 12 2013 in Windows 8.1 and integrated those set of generated libs with the sample application which calls FFmpeg API functions.
  When "avcodec_decode_video2()" function call is executed, I am getting following error
  [mjpeg @ 000000FC02AB1900] huffman table decode error
  Can someone please help me to find why above error is thrown ?

• FFMPEG result video freezes in the middle of playback

  10 mai 2013, par Revoluzifer

  I'm trying stitch four source videos together into one grid. For testing purposes I'm working with a single source flv using this command :

  ffmpeg -i woohoo.flv -i woohoo.flv -i woohoo.flv -i woohoo.flv \
  
  -filter_complex "[0:0]pad=iw:ih[a];[1:0]scale=w=iw/2:h=ih/2[b];
  
  [2:0]scale=w=iw/2:h=ih/2[c];[3:0]scale=w=iw/2:h=ih/2[d];
  
  [0:0]scale=w=iw/2:h=ih/2[e];[a][b]overlay=w[x];[x][c]overlay=0:h[y];
  
  [y][d]overlay=w:h[z];[z][e]overlay=0:0" -qscale 1 stitched.avi

  The stitching itself is working great, but somehow the resulting video does not show as expected.
  After running for a few frames, it gets stuck at a single frame for most of the video, skipping the frames which should be there.

  While encoding ffmpeg throws a freaking lot of messages like :

  [Parsed_overlay_8 @ 000000000459e080] Buffer queue overflow, dropping.

  Any hints on how to solve my problem ?
  My source flv is h.264 encoded, coming from Red5 media server.

  Edit : Output is :

  root@s15757871:/opt/red5/webapps/woohoo/streams# ffmpeg -i out_3.mp4 -i 3.mp4 -filter_complex "[0:0]pad=iw:ih[a];[1:0]scale=w=iw/2:h=ih/2[b];[a][b]overlay=w:h" -vcodec libx264 -r 30 -acodec copy out_final.mp4
  
  ffmpeg version N-52943-g500220a Copyright (c) 2000-2013 the FFmpeg developers
  
  built on May 10 2013 09:46:03 with gcc 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)
  
  configuration: --enable-gpl --enable-libx264 --enable-libmp3lame --enable-nonfree --enable-libaacplus
  
    libavutil      52. 30.100 / 52. 30.100
  
    libavcodec     55.  7.100 / 55.  7.100
  
    libavformat    55.  4.101 / 55.  4.101
  
    libavdevice    55.  0.100 / 55.  0.100
  
    libavfilter     3. 63.101 /  3. 63.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out_3.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
  Duration: 00:00:26.53, start: 0.000000, bitrate: 513 kb/s
  
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 447 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #0:1(und): Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, mono, s16p, 62 kb/s
  
  Metadata:
  
    handler_name    : SoundHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '3.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
  Duration: 00:00:26.60, start: 0.000000, bitrate: 639 kb/s
  
  Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 574 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #1:1(und): Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, mono, s16p, 62 kb/s
  
  Metadata:
  
    handler_name    : SoundHandler
  
  File 'out_final.mp4' already exists. Overwrite ? [y/N] y
  
  [libx264 @ 0x19baee0] using SAR=1/1
  
  [libx264 @ 0x19baee0] using cpu capabilities: MMX2 SSE2Fast SSEMisalign LZCNT
  
  [libx264 @ 0x19baee0] profile High, level 3.0
  
  [libx264 @ 0x19baee0] 264 - core 132 r2310 76a5c3a - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - 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=12 lookahead_threads=2 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
  
  Output #0, mp4, to 'out_final.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf55.4.101
  
  Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 15360 tbn, 30 tbc
  
  Stream #0:1(und): Audio: mp3 (i[0][0][0] / 0x0069), 44100 Hz, mono, 62 kb/s
  
  Metadata:
  
    handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 (h264) -> pad
  
    Stream #1:0 (h264) -> scale
  
    overlay -> Stream #0:0 (libx264)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  Buffer queue overflow, dropping.     583kB time=00:00:08.00 bitrate= 597.3kbits/s
  
  [Parsed_overlay_2 @ 0x19be420] Buffer queue overflow, dropping.
  
  Last message repeated 202 times
  
  frame=  795 fps= 96 q=-2.0 Lsize=    1700kB time=00:00:27.04 bitrate= 514.9kbits/s dup=203 drop=0
  
  video:1487kB audio:196kB subtitle:0 global headers:0kB muxing overhead 1.025454%
  
  [libx264 @ 0x19baee0] frame I:4     Avg QP:19.83  size: 34019
  
  [libx264 @ 0x19baee0] frame P:322   Avg QP:22.85  size:  3858
  
  [libx264 @ 0x19baee0] frame B:469   Avg QP:24.57  size:   305
  
  [libx264 @ 0x19baee0] consecutive B-frames: 13.8% 15.8% 20.0% 50.3%
  
  [libx264 @ 0x19baee0] mb I  I16..4: 10.5% 47.8% 41.7%
  
  [libx264 @ 0x19baee0] mb P  I16..4:  1.4%  3.0%  0.8%  P16..4: 27.1% 14.4%  9.2%  0.0% 0.0%    skip:44.1%
  
  [libx264 @ 0x19baee0] mb B  I16..4:  0.0%  0.1%  0.0%  B16..8: 15.3%  1.5%  0.2%  direct: 0.3%  skip:82.6%  L0:39.7% L1:53.8% BI: 6.5%
  
  [libx264 @ 0x19baee0] 8x8 transform intra:56.6% inter:64.9%
  
  [libx264 @ 0x19baee0] coded y,uvDC,uvAC intra: 58.4% 72.9% 39.0% inter: 8.3% 11.9% 1.0%
  
  [libx264 @ 0x19baee0] i16 v,h,dc,p: 63% 18% 10% 10%
  
  [libx264 @ 0x19baee0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 17% 20%  4%  7%  9%  6%  6%  8%
  
  [libx264 @ 0x19baee0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 21% 13%  5%  7%  8%  6%  6%  7%
  
  [libx264 @ 0x19baee0] i8c dc,h,v,p: 52% 18% 22%  9%
  
  [libx264 @ 0x19baee0] Weighted P-Frames: Y:7.5% UV:4.0%
  
  [libx264 @ 0x19baee0] ref P L0: 70.8% 16.9%  9.3%  2.8%  0.2%
  
  [libx264 @ 0x19baee0] ref B L0: 90.6%  8.1%  1.3%
  
  [libx264 @ 0x19baee0] ref B L1: 96.4%  3.6%
  
  [libx264 @ 0x19baee0] kb/s:459.39

  The source mp4 files used here have successfully been converted from flv by ffmpeg before.