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• Decode an RTP stream, process it, and encode it again

  2 mai 2013, par pinoscotto

  i'm trying to receive an RTP stream (direct with an SDP file or from an RTSP server), decode it in something like an RGB matrix (to work on it with OPENCV), and encapsulate it again in a stream, to send it to another end point.

  I've tried live555, but it hasn't encoding/decoding, and support is mostly for keyframe formats.
  I've used ffmpeg whith success but only from the command line.

  I'm wondering if there's some smarter way of doing this.
  Thanks

• ffmpeg not setting GOP size for x264

  5 juillet 2012, par Chris Robinson

  Can someone please explain to me why the following settings :

  ffmpeg -i test.avi -vcodec libx264 -g 2 -keyint_min 1 -sc_threshold 100000000 -bf 1 test.mp4

  produces the following output :

  ffmpeg version N-41668-g564bb24 Copyright (c) 2000-2012 the FFmpeg developers
  
  built on Jun 17 2012 20:18:05 with gcc 4.6.3
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --ena  libavutil      51. 58.100 / 51. 58.100
  
    libavcodec     54. 25.100 / 54. 25.100
  
    libavformat    54.  6.101 / 54.  6.101
  
    libavdevice    54.  0.100 / 54.  0.100
  
    libavfilter     2. 81.100 /  2. 81.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, avi, from 'test.avi':
  
    Metadata:
  
      encoder         : Lavf54.6.101
  
    Duration: 00:00:01.70, start: 0.000000, bitrate: 4258 kb/s
  
  Stream #0:0: Video: mpeg4 (Simple Profile) (DIVX / 0x58564944), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 29.97 tbn, 30k tbc
  
  Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16, 128 kb/s
  
  [buffer @ 0000000004115600] w:1280 h:720 pixfmt:yuv420p tb:1001/30000 fr:30000/1001 sar:1/1 sws_param:flags=2
  
  [ffmpeg_buffersink @ 00000000041157a0] No opaque field provided
  
  [libx264 @ 000000000411f120] using SAR=1/1
  
  [libx264 @ 000000000411f120] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  
  [libx264 @ 000000000411f120] profile High, level 3.1
  
  [libx264 @ 000000000411f120] 264 - core 125 r2200 999b753 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - 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=36 lookahead_threads=6 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 keOutput #0, mp4, to 'test.mp4':
  
    Metadata:
  
      encoder         : Lavf54.6.101
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 30k tbn, 29.97 tbc
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 -> libx264)
  
    Stream #0:1 -> #0:1 (mp3 -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  [libvo_aacenc @ 0000000001ebe240] Que input is backward in time
  
  Last message repeated 8 times
  
  frame=   35 fps=0.0 q=-1.0 Lsize=     466kB time=00:00:01.10 bitrate=3466.6kbits/s dup=1 drop=0    
  
  
  
  video:436kB audio:28kB global headers:0kB muxing overhead 0.558509%
  
  [libx264 @ 000000000411f120] frame I:1     Avg QP:24.93  size: 92398
  
  [libx264 @ 000000000411f120] frame P:28    Avg QP:26.82  size: 12010
  
  [libx264 @ 000000000411f120] frame B:6     Avg QP:30.37  size:  2764
  
  [libx264 @ 000000000411f120] consecutive B-frames: 74.3%  5.7%  8.6% 11.4%
  
  [libx264 @ 000000000411f120] mb I  I16..4: 41.5% 40.1% 18.4%
  
  [libx264 @ 000000000411f120] mb P  I16..4:  3.9%  1.4%  0.6%  P16..4: 14.3%  4.7%  3.2%  0.0%  0.0%    skip:72.0%
  
  [libx264 @ 000000000411f120] mb B  I16..4:  1.1%  0.4%  0.1%  B16..8: 14.2%  2.8%  0.6%  direct: 1.1%  skip:79.8%  L0:49.8% L1:39.5% BI:10.8%
  
  [libx264 @ 000000000411f120] 8x8 transform intra:29.9% inter:76.4%
  
  [libx264 @ 000000000411f120] coded y,uvDC,uvAC intra: 31.1% 34.4% 18.7% inter: 10.2% 6.3% 3.0%
  
  [libx264 @ 000000000411f120] i16 v,h,dc,p: 62% 34%  3%  0%
  
  [libx264 @ 000000000411f120] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 23% 38%  4%  4%  3%  3%  2%  5%
  
  [libx264 @ 000000000411f120] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 40% 35% 16%  1%  2%  2%  1%  1%  1%
  
  [libx264 @ 000000000411f120] i8c dc,h,v,p: 52% 20% 24%  3%
  
  [libx264 @ 000000000411f120] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 000000000411f120] ref P L0: 70.5% 10.1% 12.1%  7.3%
  
  [libx264 @ 000000000411f120] ref B L0: 81.1% 16.9%  2.0%
  
  [libx264 @ 000000000411f120] ref B L1: 89.7% 10.3%
  
  [libx264 @ 000000000411f120] kb/s:3050.18

  Why am I not getting an I-Frame every second frame ? Is there something else I can set to do enforce this ? If not, can you suggest how to do this using the mpeg4 codec. It's vital that I can extract what type of frame has been encoded during the encoding process and that I can set a specific GOP structure.

• ffmpeg video stitching error (error while opening decoder...)

  24 mai 2013, par Revoluzifer

  I'm trying to stitch nine videos into one grid using this command :

  /usr/local/bin/ffmpeg -loglevel debug 
  
  -i ./woohoo/7_video.mp4 -i ./woohoo/5_video.mp4 -i ./woohoo/6_video.mp4 
  
  -i ./woohoo/2_video.mp4 -i ./woohoo/8_video.mp4 -i ./woohoo/0_video.mp4 
  
  -i ./woohoo/3_video.mp4 -i ./woohoo/1_video.mp4 -i ./woohoo/10_video.mp4 
  
  -filter_complex "
  
      [0:0]pad=iw:ih[a];[1:0]scale=w=iw/4:h=ih/4[b];[2:0]scale=w=iw/4:h=ih/4[c];
  
      [3:0]scale=w=iw/4:h=ih/4[d];[4:0]scale=w=iw/4:h=ih/4[e];
  
      [5:0]scale=w=iw/4:h=ih/4[f];[6:0]scale=w=iw/4:h=ih/4[g];
  
      [7:0]scale=w=iw/4:h=ih/4[h];[8:0]scale=w=iw/4:h=ih/4[i];
  
      [0:0]scale=w=iw/4:h=ih/4[j];
  
      [a][b]overlay=0*w:0*h[k];[k][c]overlay=1*w:0*h[l];[l][d]overlay=2*w:0*h[m];
  
      [m][e]overlay=0*w:1*h[n];[n][f]overlay=1*w:1*h[o];[o][g]overlay=2*w:1*h[p];
  
      [p][h]overlay=0*w:2*h[q];[q][i]overlay=1*w:2*h[r];[r][j]overlay=2*w:2*h
  
      " 
  
  -c:v libx264 -an -r 30 -q:v 0 -threads 0 ./woohoo/10_video_out.mp4

  I'm running Ubuntu 10.04 LTS

  The complete output given by ffmpeg looks like this :

  ffmpeg version N-52943-g500220a Copyright (c) 2000-2013 the FFmpeg developers
  
    built on May 23 2013 16:44:21 with gcc 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)
  
    configuration: --enable-gpl --enable-version3 --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-zlib
  
    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
  
  Splitting the commandline.
  
  
  
  (...)
  
  
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file ./woohoo/7_video.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: ./woohoo/7_video.mp4.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2919e20] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2919e20] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2919e20] File position before avformat_find_stream_info() is 969848
  
  [h264 @ 0x291aa80] no picture 
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2919e20] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2919e20] File position after avformat_find_stream_info() is 19245
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './woohoo/7_video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
    Duration: 00:00:14.93, start: 0.000000, bitrate: 519 kb/s
  
      Stream #0:0(und), 1, 1/15360: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1/60, 516 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Successfully opened the file.
  
  Parsing a group of options: input file ./woohoo/5_video.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: ./woohoo/5_video.mp4.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x291f580] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x291f580] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x291f580] File position before avformat_find_stream_info() is 990829
  
  [h264 @ 0x2920340] no picture 
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x291f580] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x291f580] File position after avformat_find_stream_info() is 15914
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from './woohoo/5_video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
    Duration: 00:00:14.93, start: 0.000000, bitrate: 530 kb/s
  
      Stream #1:0(und), 1, 1/15360: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1/60, 528 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Successfully opened the file.
  
  Parsing a group of options: input file ./woohoo/6_video.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: ./woohoo/6_video.mp4.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2921aa0] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2921aa0] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2921aa0] File position before avformat_find_stream_info() is 709220
  
  [h264 @ 0x2935f60] no picture 
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2921aa0] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2921aa0] File position after avformat_find_stream_info() is 22467
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from './woohoo/6_video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
    Duration: 00:00:15.00, start: 0.000000, bitrate: 378 kb/s
  
      Stream #2:0(und), 1, 1/15360: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1/60, 375 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Successfully opened the file.
  
  Parsing a group of options: input file ./woohoo/2_video.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: ./woohoo/2_video.mp4.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x29ad800] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x29ad800] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x29ad800] File position before avformat_find_stream_info() is 928241
  
  [h264 @ 0x29b1040] no picture 
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x29ad800] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x29ad800] File position after avformat_find_stream_info() is 28508
  
  Input #3, mov,mp4,m4a,3gp,3g2,mj2, from './woohoo/2_video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
    Duration: 00:00:14.87, start: 0.000000, bitrate: 499 kb/s
  
      Stream #3:0(und), 1, 1/15360: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1/60, 496 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Successfully opened the file.
  
  Parsing a group of options: input file ./woohoo/8_video.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: ./woohoo/8_video.mp4.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x29b2f00] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x29b2f00] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x29b2f00] File position before avformat_find_stream_info() is 1038553
  
  [h264 @ 0x29b3cc0] no picture 
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x29b2f00] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x29b2f00] File position after avformat_find_stream_info() is 20282
  
  Input #4, mov,mp4,m4a,3gp,3g2,mj2, from './woohoo/8_video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
    Duration: 00:00:15.03, start: 0.000000, bitrate: 552 kb/s
  
      Stream #4:0(und), 1, 1/15360: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1/60, 549 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Successfully opened the file.
  
  Parsing a group of options: input file ./woohoo/0_video.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: ./woohoo/0_video.mp4.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2a30f20] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2a30f20] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2a30f20] File position before avformat_find_stream_info() is 1158061
  
  [h264 @ 0x2a318e0] no picture 
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2a30f20] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2a30f20] File position after avformat_find_stream_info() is 19639
  
  Input #5, mov,mp4,m4a,3gp,3g2,mj2, from './woohoo/0_video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
    Duration: 00:00:15.03, start: 0.000000, bitrate: 616 kb/s
  
      Stream #5:0(und), 1, 1/15360: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1/60, 614 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Successfully opened the file.
  
  Parsing a group of options: input file ./woohoo/3_video.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: ./woohoo/3_video.mp4.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ac6ba0] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ac6ba0] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ac6ba0] File position before avformat_find_stream_info() is 1102892
  
  [h264 @ 0x2ab4f00] no picture 
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ac6ba0] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ac6ba0] File position after avformat_find_stream_info() is 22585
  
  Input #6, mov,mp4,m4a,3gp,3g2,mj2, from './woohoo/3_video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
    Duration: 00:00:15.03, start: 0.000000, bitrate: 586 kb/s
  
      Stream #6:0(und), 1, 1/15360: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1/60, 583 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Successfully opened the file.
  
  Parsing a group of options: input file ./woohoo/1_video.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: ./woohoo/1_video.mp4.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ab6b20] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ab6b20] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ab6b20] File position before avformat_find_stream_info() is 933389
  
  [h264 @ 0x2ad7d80] no picture 
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ab6b20] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ab6b20] File position after avformat_find_stream_info() is 20610
  
  Input #7, mov,mp4,m4a,3gp,3g2,mj2, from './woohoo/1_video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
    Duration: 00:00:14.97, start: 0.000000, bitrate: 498 kb/s
  
      Stream #7:0(und), 1, 1/15360: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1/60, 495 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Successfully opened the file.
  
  Parsing a group of options: input file ./woohoo/10_video.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: ./woohoo/10_video.mp4.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ad9ac0] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ad9ac0] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ad9ac0] File position before avformat_find_stream_info() is 933355
  
  [h264 @ 0x2ada4a0] no picture 
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ad9ac0] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ad9ac0] File position after avformat_find_stream_info() is 21283
  
  Input #8, mov,mp4,m4a,3gp,3g2,mj2, from './woohoo/10_video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
    Duration: 00:00:15.03, start: 0.000000, bitrate: 496 kb/s
  
      Stream #8:0(und), 1, 1/15360: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1/60, 493 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Successfully opened the file.
  
  Parsing a group of options: output file ./woohoo/10_video_out.mp4.
  
  Applying option c:v (codec name) with argument libx264.
  
  Applying option an (disable audio) with argument 1.
  
  Applying option r (set frame rate (Hz value, fraction or abbreviation)) with argument 30.
  
  Applying option q:v (use fixed quality scale (VBR)) with argument 0.
  
  Successfully parsed a group of options.
  
  Opening an output file: ./woohoo/10_video_out.mp4.
  
  [Parsed_pad_0 @ 0x2cb42a0] Setting 'width' to value 'iw'
  
  [Parsed_pad_0 @ 0x2cb42a0] Setting 'height' to value 'ih'
  
  [Parsed_scale_1 @ 0x2cb58a0] Setting 'w' to value 'iw/4'
  
  [Parsed_scale_1 @ 0x2cb58a0] Setting 'h' to value 'ih/4'
  
  [Parsed_scale_1 @ 0x2cb58a0] w:iw/4 h:ih/4 flags:'bilinear' interl:0
  
  [Parsed_scale_2 @ 0x2cb6a60] Setting 'w' to value 'iw/4'
  
  [Parsed_scale_2 @ 0x2cb6a60] Setting 'h' to value 'ih/4'
  
  [Parsed_scale_2 @ 0x2cb6a60] w:iw/4 h:ih/4 flags:'bilinear' interl:0
  
  [Parsed_scale_3 @ 0x2cb7920] Setting 'w' to value 'iw/4'
  
  [Parsed_scale_3 @ 0x2cb7920] Setting 'h' to value 'ih/4'
  
  [Parsed_scale_3 @ 0x2cb7920] w:iw/4 h:ih/4 flags:'bilinear' interl:0
  
  [Parsed_scale_4 @ 0x2cb8580] Setting 'w' to value 'iw/4'
  
  [Parsed_scale_4 @ 0x2cb8580] Setting 'h' to value 'ih/4'
  
  [Parsed_scale_4 @ 0x2cb8580] w:iw/4 h:ih/4 flags:'bilinear' interl:0
  
  [Parsed_scale_5 @ 0x2d2f0c0] Setting 'w' to value 'iw/4'
  
  [Parsed_scale_5 @ 0x2d2f0c0] Setting 'h' to value 'ih/4'
  
  [Parsed_scale_5 @ 0x2d2f0c0] w:iw/4 h:ih/4 flags:'bilinear' interl:0
  
  [Parsed_scale_6 @ 0x2d302a0] Setting 'w' to value 'iw/4'
  
  [Parsed_scale_6 @ 0x2d302a0] Setting 'h' to value 'ih/4'
  
  [Parsed_scale_6 @ 0x2d302a0] w:iw/4 h:ih/4 flags:'bilinear' interl:0
  
  [Parsed_scale_7 @ 0x2d31060] Setting 'w' to value 'iw/4'
  
  [Parsed_scale_7 @ 0x2d31060] Setting 'h' to value 'ih/4'
  
  [Parsed_scale_7 @ 0x2d31060] w:iw/4 h:ih/4 flags:'bilinear' interl:0
  
  [Parsed_scale_8 @ 0x2d31d60] Setting 'w' to value 'iw/4'
  
  [Parsed_scale_8 @ 0x2d31d60] Setting 'h' to value 'ih/4'
  
  [Parsed_scale_8 @ 0x2d31d60] w:iw/4 h:ih/4 flags:'bilinear' interl:0
  
  [Parsed_scale_9 @ 0x2d32c60] Setting 'w' to value 'iw/4'
  
  [Parsed_scale_9 @ 0x2d32c60] Setting 'h' to value 'ih/4'
  
  [Parsed_scale_9 @ 0x2d32c60] w:iw/4 h:ih/4 flags:'bilinear' interl:0
  
  [Parsed_overlay_10 @ 0x2cb69a0] Setting 'x' to value '0*w'
  
  [Parsed_overlay_10 @ 0x2cb69a0] Setting 'y' to value '0*h'
  
  [Parsed_overlay_11 @ 0x2cb6420] Setting 'x' to value '1*w'
  
  [Parsed_overlay_11 @ 0x2cb6420] Setting 'y' to value '0*h'
  
  [Parsed_overlay_12 @ 0x2d2ee20] Setting 'x' to value '2*w'
  
  [Parsed_overlay_12 @ 0x2d2ee20] Setting 'y' to value '0*h'
  
  [Parsed_overlay_13 @ 0x2cb7220] Setting 'x' to value '0*w'
  
  [Parsed_overlay_13 @ 0x2cb7220] Setting 'y' to value '1*h'
  
  [Parsed_overlay_14 @ 0x2d322e0] Setting 'x' to value '1*w'
  
  [Parsed_overlay_14 @ 0x2d322e0] Setting 'y' to value '1*h'
  
  [Parsed_overlay_15 @ 0x2d2fba0] Setting 'x' to value '2*w'
  
  [Parsed_overlay_15 @ 0x2d2fba0] Setting 'y' to value '1*h'
  
  [Parsed_overlay_16 @ 0x2cb83a0] Setting 'x' to value '0*w'
  
  [Parsed_overlay_16 @ 0x2cb83a0] Setting 'y' to value '2*h'
  
  [Parsed_overlay_17 @ 0x2cb8480] Setting 'x' to value '1*w'
  
  [Parsed_overlay_17 @ 0x2cb8480] Setting 'y' to value '2*h'
  
  [Parsed_overlay_18 @ 0x2d30d80] Setting 'x' to value '2*w'
  
  [Parsed_overlay_18 @ 0x2d30d80] Setting 'y' to value '2*h'
  
  [graph 0 input from stream 0:0 @ 0x2d36880] Setting 'video_size' to value '640x360'
  
  [graph 0 input from stream 0:0 @ 0x2d36880] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 0:0 @ 0x2d36880] Setting 'time_base' to value '1/15360'
  
  [graph 0 input from stream 0:0 @ 0x2d36880] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 0:0 @ 0x2d36880] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 0x2d36880] Setting 'frame_rate' to value '30/1'
  
  [graph 0 input from stream 0:0 @ 0x2d36880] w:640 h:360 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:1/1 sws_param:flags=2
  
  [graph 0 input from stream 1:0 @ 0x2d2e780] Setting 'video_size' to value '640x360'
  
  [graph 0 input from stream 1:0 @ 0x2d2e780] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 1:0 @ 0x2d2e780] Setting 'time_base' to value '1/15360'
  
  [graph 0 input from stream 1:0 @ 0x2d2e780] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 1:0 @ 0x2d2e780] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 1:0 @ 0x2d2e780] Setting 'frame_rate' to value '30/1'
  
  [graph 0 input from stream 1:0 @ 0x2d2e780] w:640 h:360 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:1/1 sws_param:flags=2
  
  [graph 0 input from stream 2:0 @ 0x2cb4d40] Setting 'video_size' to value '640x360'
  
  [graph 0 input from stream 2:0 @ 0x2cb4d40] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 2:0 @ 0x2cb4d40] Setting 'time_base' to value '1/15360'
  
  [graph 0 input from stream 2:0 @ 0x2cb4d40] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 2:0 @ 0x2cb4d40] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 2:0 @ 0x2cb4d40] Setting 'frame_rate' to value '30/1'
  
  [graph 0 input from stream 2:0 @ 0x2cb4d40] w:640 h:360 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:1/1 sws_param:flags=2
  
  [graph 0 input from stream 3:0 @ 0x2d318e0] Setting 'video_size' to value '640x360'
  
  [graph 0 input from stream 3:0 @ 0x2d318e0] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 3:0 @ 0x2d318e0] Setting 'time_base' to value '1/15360'
  
  [graph 0 input from stream 3:0 @ 0x2d318e0] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 3:0 @ 0x2d318e0] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 3:0 @ 0x2d318e0] Setting 'frame_rate' to value '30/1'
  
  [graph 0 input from stream 3:0 @ 0x2d318e0] w:640 h:360 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:1/1 sws_param:flags=2
  
  [graph 0 input from stream 4:0 @ 0x2cb60c0] Setting 'video_size' to value '640x360'
  
  [graph 0 input from stream 4:0 @ 0x2cb60c0] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 4:0 @ 0x2cb60c0] Setting 'time_base' to value '1/15360'
  
  [graph 0 input from stream 4:0 @ 0x2cb60c0] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 4:0 @ 0x2cb60c0] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 4:0 @ 0x2cb60c0] Setting 'frame_rate' to value '30/1'
  
  [graph 0 input from stream 4:0 @ 0x2cb60c0] w:640 h:360 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:1/1 sws_param:flags=2
  
  [graph 0 input from stream 5:0 @ 0x2d2f9e0] Setting 'video_size' to value '640x360'
  
  [graph 0 input from stream 5:0 @ 0x2d2f9e0] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 5:0 @ 0x2d2f9e0] Setting 'time_base' to value '1/15360'
  
  [graph 0 input from stream 5:0 @ 0x2d2f9e0] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 5:0 @ 0x2d2f9e0] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 5:0 @ 0x2d2f9e0] Setting 'frame_rate' to value '30/1'
  
  [graph 0 input from stream 5:0 @ 0x2d2f9e0] w:640 h:360 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:1/1 sws_param:flags=2
  
  [graph 0 input from stream 6:0 @ 0x2d33380] Setting 'video_size' to value '640x360'
  
  [graph 0 input from stream 6:0 @ 0x2d33380] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 6:0 @ 0x2d33380] Setting 'time_base' to value '1/15360'
  
  [graph 0 input from stream 6:0 @ 0x2d33380] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 6:0 @ 0x2d33380] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 6:0 @ 0x2d33380] Setting 'frame_rate' to value '30/1'
  
  [graph 0 input from stream 6:0 @ 0x2d33380] w:640 h:360 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:1/1 sws_param:flags=2
  
  [graph 0 input from stream 7:0 @ 0x2cb55c0] Setting 'video_size' to value '640x360'
  
  [graph 0 input from stream 7:0 @ 0x2cb55c0] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 7:0 @ 0x2cb55c0] Setting 'time_base' to value '1/15360'
  
  [graph 0 input from stream 7:0 @ 0x2cb55c0] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 7:0 @ 0x2cb55c0] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 7:0 @ 0x2cb55c0] Setting 'frame_rate' to value '30/1'
  
  [graph 0 input from stream 7:0 @ 0x2cb55c0] w:640 h:360 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:1/1 sws_param:flags=2
  
  [graph 0 input from stream 8:0 @ 0x2d34ae0] Setting 'video_size' to value '640x360'
  
  [graph 0 input from stream 8:0 @ 0x2d34ae0] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 8:0 @ 0x2d34ae0] Setting 'time_base' to value '1/15360'
  
  [graph 0 input from stream 8:0 @ 0x2d34ae0] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 8:0 @ 0x2d34ae0] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 8:0 @ 0x2d34ae0] Setting 'frame_rate' to value '30/1'
  
  [graph 0 input from stream 8:0 @ 0x2d34ae0] w:640 h:360 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:1/1 sws_param:flags=2
  
  [graph 0 input from stream 0:0 @ 0x2d2f8e0] Setting 'video_size' to value '640x360'
  
  [graph 0 input from stream 0:0 @ 0x2d2f8e0] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 0:0 @ 0x2d2f8e0] Setting 'time_base' to value '1/15360'
  
  [graph 0 input from stream 0:0 @ 0x2d2f8e0] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 0:0 @ 0x2d2f8e0] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 0x2d2f8e0] Setting 'frame_rate' to value '30/1'
  
  [graph 0 input from stream 0:0 @ 0x2d2f8e0] w:640 h:360 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:1/1 sws_param:flags=2
  
  [format @ 0x2d382c0] compat: called with args=[yuv420p|yuvj420p|yuv422p|yuv444p]
  
  [format @ 0x2d382c0] Setting 'pix_fmts' to value 'yuv420p|yuvj420p|yuv422p|yuv444p'
  
  Successfully opened the file.
  
  [AVFilterGraph @ 0x2cb0e80] query_formats: 31 queried, 30 merged, 0 already done, 0 delayed
  
  [Parsed_pad_0 @ 0x2cb42a0] w:640 h:360 -> w:640 h:360 x:0 y:0 color:0x000000FF
  
  [Parsed_scale_1 @ 0x2cb58a0] w:640 h:360 fmt:yuv420p sar:1/1 -> w:160 h:90 fmt:yuva420p sar:1/1 flags:0x2
  
  [Parsed_overlay_10 @ 0x2cb69a0] main w:640 h:360 fmt:yuv420p overlay w:160 h:90 fmt:yuva420p
  
  [Parsed_scale_2 @ 0x2cb6a60] w:640 h:360 fmt:yuv420p sar:1/1 -> w:160 h:90 fmt:yuva420p sar:1/1 flags:0x2
  
  [Parsed_overlay_11 @ 0x2cb6420] main w:640 h:360 fmt:yuv420p overlay w:160 h:90 fmt:yuva420p
  
  [Parsed_scale_3 @ 0x2cb7920] w:640 h:360 fmt:yuv420p sar:1/1 -> w:160 h:90 fmt:yuva420p sar:1/1 flags:0x2
  
  [Parsed_overlay_12 @ 0x2d2ee20] main w:640 h:360 fmt:yuv420p overlay w:160 h:90 fmt:yuva420p
  
  [Parsed_scale_4 @ 0x2cb8580] w:640 h:360 fmt:yuv420p sar:1/1 -> w:160 h:90 fmt:yuva420p sar:1/1 flags:0x2
  
  [Parsed_overlay_13 @ 0x2cb7220] main w:640 h:360 fmt:yuv420p overlay w:160 h:90 fmt:yuva420p
  
  [Parsed_scale_5 @ 0x2d2f0c0] w:640 h:360 fmt:yuv420p sar:1/1 -> w:160 h:90 fmt:yuva420p sar:1/1 flags:0x2
  
  [Parsed_overlay_14 @ 0x2d322e0] main w:640 h:360 fmt:yuv420p overlay w:160 h:90 fmt:yuva420p
  
  [Parsed_scale_6 @ 0x2d302a0] w:640 h:360 fmt:yuv420p sar:1/1 -> w:160 h:90 fmt:yuva420p sar:1/1 flags:0x2
  
  [Parsed_overlay_15 @ 0x2d2fba0] main w:640 h:360 fmt:yuv420p overlay w:160 h:90 fmt:yuva420p
  
  [Parsed_scale_7 @ 0x2d31060] w:640 h:360 fmt:yuv420p sar:1/1 -> w:160 h:90 fmt:yuva420p sar:1/1 flags:0x2
  
  [Parsed_overlay_16 @ 0x2cb83a0] main w:640 h:360 fmt:yuv420p overlay w:160 h:90 fmt:yuva420p
  
  [Parsed_scale_8 @ 0x2d31d60] w:640 h:360 fmt:yuv420p sar:1/1 -> w:160 h:90 fmt:yuva420p sar:1/1 flags:0x2
  
  [Parsed_overlay_17 @ 0x2cb8480] main w:640 h:360 fmt:yuv420p overlay w:160 h:90 fmt:yuva420p
  
  [Parsed_scale_9 @ 0x2d32c60] w:640 h:360 fmt:yuv420p sar:1/1 -> w:160 h:90 fmt:yuva420p sar:1/1 flags:0x2
  
  [Parsed_overlay_18 @ 0x2d30d80] main w:640 h:360 fmt:yuv420p overlay w:160 h:90 fmt:yuva420p
  
  [libx264 @ 0x2d38ae0] using mv_range_thread = 24
  
  [libx264 @ 0x2d38ae0] using SAR=1/1
  
  [libx264 @ 0x2d38ae0] using cpu capabilities: MMX2 SSE2Fast SSEMisalign LZCNT
  
  [libx264 @ 0x2d38ae0] profile High, level 3.0
  
  [libx264 @ 0x2d38ae0] 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
  
  [h264 @ 0x291aa80] detected 8 logical cores
  
  [h264 @ 0x2920340] detected 8 logical cores
  
  [h264 @ 0x2935f60] detected 8 logical cores
  
  [h264 @ 0x29b1040] detected 8 logical cores
  
  [h264 @ 0x29b3cc0] detected 8 logical cores
  
  Output #0, mp4, to './woohoo/10_video_out.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.4.101
  
      Stream #0:0, 0, 1/90000: Video: h264, yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1/30, q=-1--1, 90k tbn, 30 tbc
  
  Stream mapping:
  
    Stream #0:0 (h264) -> pad
  
    Stream #0:0 (h264) -> scale
  
    Stream #1:0 (h264) -> scale
  
    Stream #2:0 (h264) -> scale
  
    Stream #3:0 (h264) -> scale
  
    Stream #4:0 (h264) -> scale
  
    Stream #5:0 (h264) -> scale
  
    Stream #6:0 (h264) -> scale
  
    Stream #7:0 (h264) -> scale
  
    Stream #8:0 (h264) -> scale
  
    overlay -> Stream #0:0 (libx264)
  
  Error while opening decoder for input stream #4:0
  
  [AVIOContext @ 0x2d2fea0] Statistics: 0 seeks, 0 writeouts
  
  [AVIOContext @ 0x28dd8e0] Statistics: 71559 bytes read, 2 seeks
  
  [AVIOContext @ 0x291fae0] Statistics: 70647 bytes read, 2 seeks
  
  [AVIOContext @ 0x2931c40] Statistics: 71199 bytes read, 2 seeks
  
  [AVIOContext @ 0x2935e40] Statistics: 71399 bytes read, 2 seeks
  
  [AVIOContext @ 0x29b3480] Statistics: 71339 bytes read, 2 seeks
  
  [AVIOContext @ 0x2a2e180] Statistics: 69591 bytes read, 2 seeks
  
  [AVIOContext @ 0x2a317c0] Statistics: 71147 bytes read, 2 seeks
  
  [AVIOContext @ 0x2ab4de0] Statistics: 71363 bytes read, 2 seeks
  
  [AVIOContext @ 0x2c3ab00] Statistics: 71647 bytes read, 2 seeks

  The error line

  Error while opening decoder for input stream #4:0

  seems to be kind of random to me - at least the streams, ffmpeg fails on changes from time to time.