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• 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.