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• ffmpeg - How to determine if -movflags faststart is enabled ? PHP

  6 juillet 2017, par IIIOXIII

  While I am able to encode an mp4 file which I can play on my local windows machine, I am having trouble encoding files to mp4 which are readable when streaming by safari, etc.

  After a bit of reading, I believe my issue is that I must move the metadata from the end of the file to the beginning in order for the converted mp4 files to be streamable.

  To that end, I am trying to find out if the build of ffmpeg that I am currently using is able to use the -movflags faststart option through php - as my current outputted mp4 files are not working when streamed online.

  This is the way I am now echoing the -help, -formats, -codecs, but I am not seeing anything about -movflags faststart in any of the lists :

  exec($ffmpegPath." -help", $codecArr);
  
  for($ii=0;$iibr>';
  
  }

  Is there a similar method of determining if -movflags fastart is available to my ffmpeg build ? Any other way ? Should it be listed with any of the previously suggested commands ? -help/-formats ?

  Can someone that knows it is enabled in their version of ffmpeg check to see if it is listed under -help or -formats, etc.?

  TIA.

  EDIT : COMPLETE CONSOLE OUTPUT FOR BOTH THE CONVERSION COMMAND AND -MOVFLAGS COMMAND BELOW :

  COMMAND :

  ffmpeg -i C:\vidtests\Wildlife.wmv -s 640x480 C:\vidtests\Wildlife.mp4 

  OUTPUT :

  ffmpeg version N-54207-ge59fb3f Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun 25 2013 21:55:00 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 37.101 / 52. 37.101
  
    libavcodec     55. 17.100 / 55. 17.100
  
    libavformat    55. 10.100 / 55. 10.100
  
    libavdevice    55.  2.100 / 55.  2.100
  
    libavfilter     3. 77.101 /  3. 77.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [asf @ 00000000002ed760] Stream #0: not enough frames to estimate rate; consider
  
   increasing probesize
  
  Guessed Channel Layout for  Input Stream #0.0 : stereo
  
  Input #0, asf, from 'C:\vidtests\Wildlife.wmv'
  
  :
  
    Metadata:
  
      SfOriginalFPS   : 299700
  
      WMFSDKVersion   : 11.0.6001.7000
  
      WMFSDKNeeded    : 0.0.0.0000
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand
  
   | Producer: Gary F. Spradling | Music: Steve Ball
  
      title           : Wildlife in HD
  
      copyright       : ┬⌐ 2008 Microsoft Corporation
  
      IsVBR           : 0
  
      DeviceConformanceTemplate: AP@L3
  
    Duration: 00:00:30.09, start: 0.000000, bitrate: 6977 kb/s
  
      Stream #0:0(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, fltp
  
  , 192 kb/s
  
      Stream #0:1(eng): Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p, 1280x7
  
  20, 5942 kb/s, 29.97 tbr, 1k tbn, 1k tbc
  
  [libx264 @ 00000000002e6980] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
  
  
  
  [libx264 @ 00000000002e6980] profile High, level 3.0
  
  [libx264 @ 00000000002e6980] 264 - core 133 r2334 a3ac64b - H.264/MPEG-4 AVC cod
  
  ec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 r
  
  ef=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_pski
  
  p=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 deci
  
  mate=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=2
  
  5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.6
  
  0 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'C:\vidtests\Wildlife.mp4':
  
  
  
    Metadata:
  
      SfOriginalFPS   : 299700
  
      WMFSDKVersion   : 11.0.6001.7000
  
      WMFSDKNeeded    : 0.0.0.0000
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand
  
   | Producer: Gary F. Spradling | Music: Steve Ball
  
      title           : Wildlife in HD
  
      copyright       : ┬⌐ 2008 Microsoft Corporation
  
      IsVBR           : 0
  
      DeviceConformanceTemplate: AP@L3
  
      encoder         : Lavf55.10.100
  
      Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 6
  
  40x480, q=-1--1, 30k tbn, 29.97 tbc
  
      Stream #0:1(eng): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100
  
  Hz, stereo, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (vc1 -> libx264)
  
    Stream #0:0 -> #0:1 (wmav2 -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  frame=   53 fps= 49 q=29.0 size=       0kB time=00:00:00.13 bitrate=   2.9kbits/
  
  frame=   63 fps= 40 q=29.0 size=       0kB time=00:00:00.46 bitrate=   0.8kbits/
  
  frame=   74 fps= 35 q=29.0 size=       0kB time=00:00:00.83 bitrate=   0.5kbits/
  
  frame=   85 fps= 32 q=29.0 size=       0kB time=00:00:01.20 bitrate=   0.3kbits/
  
  frame=   95 fps= 30 q=29.0 size=       0kB time=00:00:01.53 bitrate=   0.3kbits/
  
  frame=  107 fps= 28 q=29.0 size=       0kB time=00:00:01.93 bitrate=   0.2kbits/
  
  Queue input is backward in time
  
  [mp4 @ 00000000003ef800] Non-monotonous DTS in output stream 0:1; previous: 7616
  
  , current: 7063; changing to 7617. This may result in incorrect timestamps in th
  
  e output file.
  
  frame=  118 fps= 28 q=29.0 size=     113kB time=00:00:02.30 bitrate= 402.6kbits/
  
  frame=  129 fps= 26 q=29.0 size=     219kB time=00:00:02.66 bitrate= 670.7kbits/
  
  frame=  141 fps= 26 q=29.0 size=     264kB time=00:00:03.06 bitrate= 704.2kbits/
  
  frame=  152 fps= 25 q=29.0 size=     328kB time=00:00:03.43 bitrate= 782.2kbits/
  
  frame=  163 fps= 25 q=29.0 size=     431kB time=00:00:03.80 bitrate= 928.1kbits/
  
  frame=  174 fps= 24 q=29.0 size=     568kB time=00:00:04.17 bitrate=1116.3kbits/
  
  frame=  190 fps= 25 q=29.0 size=     781kB time=00:00:04.70 bitrate=1359.9kbits/
  
  frame=  204 fps= 25 q=29.0 size=    1006kB time=00:00:05.17 bitrate=1593.1kbits/
  
  frame=  218 fps= 25 q=29.0 size=    1058kB time=00:00:05.63 bitrate=1536.8kbits/
  
  frame=  229 fps= 25 q=29.0 size=    1093kB time=00:00:06.00 bitrate=1490.9kbits/
  
  frame=  239 fps= 24 q=29.0 size=    1118kB time=00:00:06.33 bitrate=1444.4kbits/
  
  frame=  251 fps= 24 q=29.0 size=    1150kB time=00:00:06.74 bitrate=1397.9kbits/
  
  frame=  265 fps= 24 q=29.0 size=    1234kB time=00:00:07.20 bitrate=1402.3kbits/
  
  frame=  278 fps= 25 q=29.0 size=    1332kB time=00:00:07.64 bitrate=1428.3kbits/
  
  frame=  294 fps= 25 q=29.0 size=    1403kB time=00:00:08.17 bitrate=1405.7kbits/
  
  frame=  308 fps= 25 q=29.0 size=    1547kB time=00:00:08.64 bitrate=1466.4kbits/
  
  frame=  323 fps= 25 q=29.0 size=    1595kB time=00:00:09.14 bitrate=1429.5kbits/
  
  frame=  337 fps= 25 q=29.0 size=    1702kB time=00:00:09.60 bitrate=1450.7kbits/
  
  frame=  351 fps= 25 q=29.0 size=    1755kB time=00:00:10.07 bitrate=1427.1kbits/
  
  frame=  365 fps= 25 q=29.0 size=    1820kB time=00:00:10.54 bitrate=1414.1kbits/
  
  frame=  381 fps= 25 q=29.0 size=    1852kB time=00:00:11.07 bitrate=1369.6kbits/
  
  frame=  396 fps= 26 q=29.0 size=    1893kB time=00:00:11.57 bitrate=1339.5kbits/
  
  frame=  409 fps= 26 q=29.0 size=    1923kB time=00:00:12.01 bitrate=1311.8kbits/
  
  frame=  421 fps= 25 q=29.0 size=    1967kB time=00:00:12.41 bitrate=1298.3kbits/
  
  frame=  434 fps= 25 q=29.0 size=    1998kB time=00:00:12.84 bitrate=1274.0kbits/
  
  frame=  445 fps= 25 q=29.0 size=    2018kB time=00:00:13.21 bitrate=1251.3kbits/
  
  frame=  458 fps= 25 q=29.0 size=    2048kB time=00:00:13.64 bitrate=1229.5kbits/
  
  frame=  471 fps= 25 q=29.0 size=    2067kB time=00:00:14.08 bitrate=1202.3kbits/
  
  frame=  484 fps= 25 q=29.0 size=    2189kB time=00:00:14.51 bitrate=1235.5kbits/
  
  frame=  497 fps= 25 q=29.0 size=    2260kB time=00:00:14.94 bitrate=1238.3kbits/
  
  frame=  509 fps= 25 q=29.0 size=    2311kB time=00:00:15.34 bitrate=1233.3kbits/
  
  frame=  523 fps= 25 q=29.0 size=    2429kB time=00:00:15.81 bitrate=1258.1kbits/
  
  frame=  535 fps= 25 q=29.0 size=    2541kB time=00:00:16.21 bitrate=1283.5kbits/
  
  frame=  548 fps= 25 q=29.0 size=    2718kB time=00:00:16.64 bitrate=1337.5kbits/
  
  frame=  560 fps= 25 q=29.0 size=    2845kB time=00:00:17.05 bitrate=1367.1kbits/
  
  frame=  571 fps= 25 q=29.0 size=    2965kB time=00:00:17.41 bitrate=1394.6kbits/
  
  frame=  580 fps= 25 q=29.0 size=    3025kB time=00:00:17.71 bitrate=1398.7kbits/
  
  frame=  588 fps= 25 q=29.0 size=    3098kB time=00:00:17.98 bitrate=1411.1kbits/
  
  frame=  597 fps= 25 q=29.0 size=    3183kB time=00:00:18.28 bitrate=1426.1kbits/
  
  frame=  606 fps= 24 q=29.0 size=    3279kB time=00:00:18.58 bitrate=1445.2kbits/
  
  frame=  616 fps= 24 q=29.0 size=    3441kB time=00:00:18.91 bitrate=1489.9kbits/
  
  frame=  626 fps= 24 q=29.0 size=    3650kB time=00:00:19.25 bitrate=1553.0kbits/
  
  frame=  638 fps= 24 q=29.0 size=    3826kB time=00:00:19.65 bitrate=1594.7kbits/
  
  frame=  649 fps= 24 q=29.0 size=    3950kB time=00:00:20.02 bitrate=1616.3kbits/
  
  frame=  660 fps= 24 q=29.0 size=    4067kB time=00:00:20.38 bitrate=1634.1kbits/
  
  frame=  669 fps= 24 q=29.0 size=    4121kB time=00:00:20.68 bitrate=1631.8kbits/
  
  frame=  682 fps= 24 q=29.0 size=    4274kB time=00:00:21.12 bitrate=1657.9kbits/
  
  frame=  696 fps= 24 q=29.0 size=    4446kB time=00:00:21.58 bitrate=1687.1kbits/
  
  frame=  709 fps= 24 q=29.0 size=    4590kB time=00:00:22.02 bitrate=1707.3kbits/
  
  frame=  719 fps= 24 q=29.0 size=    4772kB time=00:00:22.35 bitrate=1748.5kbits/
  
  frame=  732 fps= 24 q=29.0 size=    4852kB time=00:00:22.78 bitrate=1744.3kbits/
  
  frame=  744 fps= 24 q=29.0 size=    4973kB time=00:00:23.18 bitrate=1756.9kbits/
  
  frame=  756 fps= 24 q=29.0 size=    5099kB time=00:00:23.59 bitrate=1770.8kbits/
  
  frame=  768 fps= 24 q=29.0 size=    5149kB time=00:00:23.99 bitrate=1758.4kbits/
  
  frame=  780 fps= 24 q=29.0 size=    5227kB time=00:00:24.39 bitrate=1755.7kbits/
  
  frame=  797 fps= 24 q=29.0 size=    5377kB time=00:00:24.95 bitrate=1765.0kbits/
  
  frame=  813 fps= 24 q=29.0 size=    5507kB time=00:00:25.49 bitrate=1769.5kbits/
  
  frame=  828 fps= 24 q=29.0 size=    5634kB time=00:00:25.99 bitrate=1775.5kbits/
  
  frame=  843 fps= 24 q=29.0 size=    5701kB time=00:00:26.49 bitrate=1762.9kbits/
  
  frame=  859 fps= 24 q=29.0 size=    5830kB time=00:00:27.02 bitrate=1767.0kbits/
  
  frame=  872 fps= 24 q=29.0 size=    5926kB time=00:00:27.46 bitrate=1767.7kbits/
  
  frame=  888 fps= 24 q=29.0 size=    6014kB time=00:00:27.99 bitrate=1759.7kbits/
  
  frame=  900 fps= 24 q=29.0 size=    6332kB time=00:00:28.39 bitrate=1826.9kbits/
  
  frame=  901 fps= 24 q=-1.0 Lsize=    6717kB time=00:00:30.10 bitrate=1828.0kbits
  
  /s
  
  video:6211kB audio:472kB subtitle:0 global headers:0kB muxing overhead 0.513217%
  
  
  
  [libx264 @ 00000000002e6980] frame I:8     Avg QP:21.77  size: 39744
  
  [libx264 @ 00000000002e6980] frame P:433   Avg QP:25.69  size: 11490
  
  [libx264 @ 00000000002e6980] frame B:460   Avg QP:29.25  size:  2319
  
  [libx264 @ 00000000002e6980] consecutive B-frames:  5.4% 78.6%  2.7% 13.3%
  
  [libx264 @ 00000000002e6980] mb I  I16..4: 21.8% 48.8% 29.5%
  
  [libx264 @ 00000000002e6980] mb P  I16..4:  0.7%  4.0%  1.3%  P16..4: 37.1% 22.2
  
  % 15.5%  0.0%  0.0%    skip:19.2%
  
  [libx264 @ 00000000002e6980] mb B  I16..4:  0.1%  0.5%  0.2%  B16..8: 43.5%  7.0
  
  %  2.1%  direct: 2.2%  skip:44.5%  L0:36.4% L1:52.7% BI:10.9%
  
  [libx264 @ 00000000002e6980] 8x8 transform intra:62.8% inter:56.2%
  
  [libx264 @ 00000000002e6980] coded y,uvDC,uvAC intra: 74.2% 78.8% 44.0% inter: 2
  
  3.6% 14.5% 1.0%
  
  [libx264 @ 00000000002e6980] i16 v,h,dc,p: 48% 24%  9% 20%
  
  [libx264 @ 00000000002e6980] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 17% 15%  7%  8%
  
  11%  8% 10%  8%
  
  [libx264 @ 00000000002e6980] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 17% 15%  7% 10%
  
  11%  8%  7%  7%
  
  [libx264 @ 00000000002e6980] i8c dc,h,v,p: 53% 21% 18%  7%
  
  [libx264 @ 00000000002e6980] Weighted P-Frames: Y:0.7% UV:0.0%
  
  [libx264 @ 00000000002e6980] ref P L0: 62.4% 19.0% 12.0%  6.6%  0.0%
  
  [libx264 @ 00000000002e6980] ref B L0: 90.5%  8.9%  0.7%
  
  [libx264 @ 00000000002e6980] ref B L1: 97.9%  2.1%
  
  [libx264 @ 00000000002e6980] kb/s:1692.37

  AND THE –MOVFLAGS COMMAND :

  ffmpeg -i C:\vidtests\Wildlife.mp4 -movflags faststart C:\vidtests\Wildlife_fs.mp4

  AND THE –MOVFLAGS OUTPUT

  ffmpeg version N-54207-ge59fb3f Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun 25 2013 21:55:00 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 37.101 / 52. 37.101
  
    libavcodec     55. 17.100 / 55. 17.100
  
    libavformat    55. 10.100 / 55. 10.100
  
    libavdevice    55.  2.100 / 55.  2.100
  
    libavfilter     3. 77.101 /  3. 77.101
  
    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 'C:\vidtests\Wildlife.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : Wildlife in HD
  
      encoder         : Lavf55.10.100
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand
  
   | Producer: Gary F. Spradling | Music: Steve Ball
  
      copyright       : ┬⌐ 2008 Microsoft Corporation
  
    Duration: 00:00:30.13, start: 0.036281, bitrate: 1826 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x480,
  
  1692 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 12
  
  8 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [libx264 @ 0000000004360620] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
  
  
  
  [libx264 @ 0000000004360620] profile High, level 3.0
  
  [libx264 @ 0000000004360620] 264 - core 133 r2334 a3ac64b - H.264/MPEG-4 AVC cod
  
  ec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 r
  
  ef=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_pski
  
  p=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 deci
  
  mate=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=2
  
  5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.6
  
  0 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'C:\vidtests\Wildlife_fs.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : Wildlife in HD
  
      copyright       : ┬⌐ 2008 Microsoft Corporation
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand
  
   | Producer: Gary F. Spradling | Music: Steve Ball
  
      encoder         : Lavf55.10.100
  
      Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 6
  
  40x480, q=-1--1, 30k tbn, 29.97 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100
  
  Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (aac -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  frame=   52 fps=0.0 q=29.0 size=      29kB time=00:00:01.76 bitrate= 133.9kbits/
  
  frame=   63 fps= 60 q=29.0 size=     104kB time=00:00:02.14 bitrate= 397.2kbits/
  
  frame=   74 fps= 47 q=29.0 size=     176kB time=00:00:02.51 bitrate= 573.2kbits/
  
  frame=   87 fps= 41 q=29.0 size=     265kB time=00:00:02.93 bitrate= 741.2kbits/
  
  frame=  101 fps= 37 q=29.0 size=     358kB time=00:00:03.39 bitrate= 862.8kbits/
  
  frame=  113 fps= 34 q=29.0 size=     437kB time=00:00:03.79 bitrate= 943.7kbits/
  
  frame=  125 fps= 33 q=29.0 size=     520kB time=00:00:04.20 bitrate=1012.2kbits/
  
  frame=  138 fps= 32 q=29.0 size=     606kB time=00:00:04.64 bitrate=1069.8kbits/
  
  frame=  151 fps= 31 q=29.0 size=     696kB time=00:00:05.06 bitrate=1124.3kbits/
  
  frame=  163 fps= 30 q=29.0 size=     780kB time=00:00:05.47 bitrate=1166.4kbits/
  
  frame=  176 fps= 30 q=29.0 size=     919kB time=00:00:05.90 bitrate=1273.9kbits/
  
  frame=  196 fps= 31 q=29.0 size=     994kB time=00:00:06.57 bitrate=1237.4kbits/
  
  frame=  213 fps= 31 q=29.0 size=    1097kB time=00:00:07.13 bitrate=1258.8kbits/
  
  frame=  225 fps= 30 q=29.0 size=    1204kB time=00:00:07.53 bitrate=1309.8kbits/
  
  frame=  236 fps= 30 q=29.0 size=    1323kB time=00:00:07.91 bitrate=1369.4kbits/
  
  frame=  249 fps= 29 q=29.0 size=    1451kB time=00:00:08.34 bitrate=1424.6kbits/
  
  frame=  263 fps= 29 q=29.0 size=    1574kB time=00:00:08.82 bitrate=1461.3kbits/
  
  frame=  278 fps= 29 q=29.0 size=    1610kB time=00:00:09.30 bitrate=1416.9kbits/
  
  frame=  296 fps= 30 q=29.0 size=    1655kB time=00:00:09.91 bitrate=1368.0kbits/
  
  frame=  313 fps= 30 q=29.0 size=    1697kB time=00:00:10.48 bitrate=1326.4kbits/
  
  frame=  330 fps= 30 q=29.0 size=    1737kB time=00:00:11.05 bitrate=1286.5kbits/
  
  frame=  345 fps= 30 q=29.0 size=    1776kB time=00:00:11.54 bitrate=1260.4kbits/
  
  frame=  361 fps= 30 q=29.0 size=    1813kB time=00:00:12.07 bitrate=1230.3kbits/
  
  frame=  377 fps= 30 q=29.0 size=    1847kB time=00:00:12.59 bitrate=1201.4kbits/
  
  frame=  395 fps= 30 q=29.0 size=    1880kB time=00:00:13.22 bitrate=1165.0kbits/
  
  frame=  410 fps= 30 q=29.0 size=    1993kB time=00:00:13.72 bitrate=1190.2kbits/
  
  frame=  424 fps= 30 q=29.0 size=    2080kB time=00:00:14.18 bitrate=1201.4kbits/
  
  frame=  439 fps= 30 q=29.0 size=    2166kB time=00:00:14.67 bitrate=1209.4kbits/
  
  frame=  455 fps= 30 q=29.0 size=    2262kB time=00:00:15.21 bitrate=1217.5kbits/
  
  frame=  469 fps= 30 q=29.0 size=    2341kB time=00:00:15.68 bitrate=1223.0kbits/
  
  frame=  484 fps= 30 q=29.0 size=    2430kB time=00:00:16.19 bitrate=1229.1kbits/
  
  frame=  500 fps= 30 q=29.0 size=    2523kB time=00:00:16.71 bitrate=1236.3kbits/
  
  frame=  515 fps= 30 q=29.0 size=    2607kB time=00:00:17.21 bitrate=1240.4kbits/
  
  frame=  531 fps= 30 q=29.0 size=    2681kB time=00:00:17.73 bitrate=1238.2kbits/
  
  frame=  546 fps= 30 q=29.0 size=    2758kB time=00:00:18.24 bitrate=1238.2kbits/
  
  frame=  561 fps= 30 q=29.0 size=    2824kB time=00:00:18.75 bitrate=1233.4kbits/
  
  frame=  576 fps= 30 q=29.0 size=    2955kB time=00:00:19.25 bitrate=1256.8kbits/
  
  frame=  586 fps= 29 q=29.0 size=    3061kB time=00:00:19.59 bitrate=1279.6kbits/
  
  frame=  598 fps= 29 q=29.0 size=    3217kB time=00:00:19.99 bitrate=1318.4kbits/
  
  frame=  610 fps= 29 q=29.0 size=    3354kB time=00:00:20.39 bitrate=1347.2kbits/
  
  frame=  622 fps= 29 q=29.0 size=    3483kB time=00:00:20.78 bitrate=1372.6kbits/
  
  frame=  634 fps= 29 q=29.0 size=    3593kB time=00:00:21.19 bitrate=1388.6kbits/
  
  frame=  648 fps= 29 q=29.0 size=    3708kB time=00:00:21.66 bitrate=1402.3kbits/
  
  frame=  661 fps= 29 q=29.0 size=    3811kB time=00:00:22.08 bitrate=1413.5kbits/
  
  frame=  674 fps= 29 q=29.0 size=    3978kB time=00:00:22.53 bitrate=1446.3kbits/
  
  frame=  690 fps= 29 q=29.0 size=    4133kB time=00:00:23.05 bitrate=1468.4kbits/
  
  frame=  706 fps= 29 q=29.0 size=    4263kB time=00:00:23.58 bitrate=1480.4kbits/
  
  frame=  721 fps= 29 q=29.0 size=    4391kB time=00:00:24.08 bitrate=1493.8kbits/
  
  frame=  735 fps= 29 q=29.0 size=    4524kB time=00:00:24.55 bitrate=1509.4kbits/
  
  frame=  748 fps= 29 q=29.0 size=    4661kB time=00:00:24.98 bitrate=1528.2kbits/
  
  frame=  763 fps= 29 q=29.0 size=    4835kB time=00:00:25.50 bitrate=1553.1kbits/
  
  frame=  778 fps= 29 q=29.0 size=    4993kB time=00:00:25.99 bitrate=1573.6kbits/
  
  frame=  795 fps= 29 q=29.0 size=    5149kB time=00:00:26.56 bitrate=1588.1kbits/
  
  frame=  814 fps= 29 q=29.0 size=    5258kB time=00:00:27.18 bitrate=1584.4kbits/
  
  frame=  833 fps= 29 q=29.0 size=    5368kB time=00:00:27.82 bitrate=1580.2kbits/
  
  frame=  851 fps= 29 q=29.0 size=    5469kB time=00:00:28.43 bitrate=1575.9kbits/
  
  frame=  870 fps= 29 q=29.0 size=    5567kB time=00:00:29.05 bitrate=1569.5kbits/
  
  frame=  889 fps= 29 q=29.0 size=    5688kB time=00:00:29.70 bitrate=1568.4kbits/
  
  Starting second pass: moving header on top of the file
  
  frame=  902 fps= 28 q=-1.0 Lsize=    6109kB time=00:00:30.14 bitrate=1659.8kbits
  
  /s dup=1 drop=0
  
  video:5602kB audio:472kB subtitle:0 global headers:0kB muxing overhead 0.566600%
  
  
  
  [libx264 @ 0000000004360620] frame I:8     Avg QP:20.52  size: 39667
  
  [libx264 @ 0000000004360620] frame P:419   Avg QP:25.06  size: 10524
  
  [libx264 @ 0000000004360620] frame B:475   Avg QP:29.03  size:  2123
  
  [libx264 @ 0000000004360620] consecutive B-frames:  3.2% 79.6%  0.3% 16.9%
  
  [libx264 @ 0000000004360620] mb I  I16..4: 20.7% 52.3% 26.9%
  
  [libx264 @ 0000000004360620] mb P  I16..4:  0.7%  4.2%  1.1%  P16..4: 39.4% 21.4
  
  % 13.8%  0.0%  0.0%    skip:19.3%
  
  [libx264 @ 0000000004360620] mb B  I16..4:  0.1%  0.9%  0.3%  B16..8: 41.8%  6.4
  
  %  1.7%  direct: 1.7%  skip:47.1%  L0:36.4% L1:53.3% BI:10.3%
  
  [libx264 @ 0000000004360620] 8x8 transform intra:65.7% inter:58.8%
  
  [libx264 @ 0000000004360620] coded y,uvDC,uvAC intra: 71.2% 76.6% 35.7% inter: 2
  
  0.7% 13.0% 0.5%
  
  [libx264 @ 0000000004360620] i16 v,h,dc,p: 48% 24%  8% 20%
  
  [libx264 @ 0000000004360620] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 18% 15%  6%  8%
  
  11%  8% 10%  8%
  
  [libx264 @ 0000000004360620] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 16% 15%  7% 10%
  
  11%  8%  8%  7%
  
  [libx264 @ 0000000004360620] i8c dc,h,v,p: 51% 22% 19%  9%
  
  [libx264 @ 0000000004360620] Weighted P-Frames: Y:0.7% UV:0.0%
  
  [libx264 @ 0000000004360620] ref P L0: 63.4% 19.7% 11.0%  5.9%  0.0%
  
  [libx264 @ 0000000004360620] ref B L0: 90.7%  8.7%  0.7%
  
  [libx264 @ 0000000004360620] ref B L1: 98.4%  1.6%
  
  [libx264 @ 0000000004360620] kb/s:1524.54

• FFmpeg : Interpolation for Fade-In

  6 juillet 2017, par Sir Bad News

  I’m currently using the following to fade-in a short film.

  ffmpeg -i input.mp4 -filter:v fade=in:0:360 -c:v libx264 -preset:v slower -crf:v 24 -pix_fmt yuv420p output.mp4

  ---

  Everything works as expected ; however, the interpolation of the fade is not what I’m after (seems to be linear). I’d like to play around with exponential, cubic, sinusoidal, etc.

  Is there any way to achieve this with FFmpeg ? The visual material I’m working with is pure white and pure black, and the fade-in as it stands is too harsh ; I can see the material appear almost as soon as the fade starts as a result of the (apparently) linear progression. I’d like it to be more organic.

  Any help greatly appreciated.

• Piwik Analytics and becoming a Piwik Certified Professional

  10 juillet 2017, par Piwik Core Team — About

  Digital Analytics software

  Piwik Analytics is the leading open source digital analytics software, offering users around the world an opportunity to liberate their analytics. Most recently, they have introduced the Piwik Certified Professional certification exam which now allows users to become qualified in Piwik Analytics software on an individual level to gain a deeper understanding of Piwik. In this blog post I will guide you through the topics that are covered during the exam and provide you with advice on taking the official Piwik Certified Professional exam.

  

  Piwik certification exam

  Taking the exam will cost you a maximum investment of 60 minutes of your time, besides learning all materials of course. The exam consists of 55 multiple choice questions with four answers to choose from. The score needed to pass is 80% (44 questions answered correctly) and the cost is 50 USD total. An earned certificate is valid for 18 months, before these eighteen months are over a person should pass the exam again in order to retain the certified status.

  Learning topics

  The exam consists of two sections. The main section is focused on the Piwik Analytics software itself while the second part relates to digital analytics in general. All topics and content covered about Piwik Analytics is available through the official Piwik user guides. The second section tests your experience as a digital analyst, online marketer or any other function title in which you work with Piwik Analytics. In this case, the general digital analytics questions should be quite straightforward and easy to answer, and cover only a fraction of the total questions in the exam (around 10% with 5-7 general questions). An outline of all exam topics are listed below :

  • A Tour of Piwik
  • Track Goals and Measure Conversions
  • Event Tracking
  • Content Tracking
  • Ecommerce Analytics
  • Row Evolution – View and compare historical data
  • Segmentation – Compare segments of visitors
  • Visitors Maps – World, region, city
  • Real Time Visitor World Map
  • Real Time Analytics
  • The Visitor Profile
  • Site speed and Page speed
  • Site Search Tracking and Reporting
    
  • Transitions – Analyze the previous and following actions of your visitors for each page
  • Page Overlay
  • Custom Variables Analytics
  • Custom Dimensions
  • User ID
  • Annotating your data
  • Tracking Campaigns
  • URL Builder for Marketing Campaign Tracking

  The best way to prepare for the exam is read the entire Piwik user guides. You should definitely read the “Analytics Features” section since most questions of the Piwik Certified Professional – Digital Analytics exam that will be asked come from these sections. Furthermore you should be able to find your way around in Piwik at a basic level which means you know what the reports mean and where to find certain information. In addition, some basic knowledge regarding the settings is useful too. The exam is definitely not a technical implementation exam so no coding knowledge or any other deeply technical knowledge regarding Piwik is required.

  Finally, some general questions will be asked regarding digital analytics covering topics about KPI’s and the role of the analyst within an organization. While Piwik provides some links to articles by Avinash Kaushik covering these topics, you will not be able to learn these topics just by reading. When you have some experience with digital analytics you should be able to answer these general digital analytics questions with common sense and (even basic) experience as a digital analyst, analytics consultant, online marketer or any other related job whereby you work with Piwik.

  Taking the exam

  With 55 questions to be answered in 60 minutes the key to passing the exam is to keep moving. You have about 1 minute and 5 seconds to answer each question. This means that you should focus on the easiest questions first and return later to the questions that are a bit more challenging to answer. Keep an eye on the timer that will be displayed in the exam window. When the time expires or you click ‘Finish test’ your exam will end and be automatically submitted for review. Remember to first check all questions and answers before you click on the ‘Finish test’ button. If you click too soon and you still haven’t answered all questions, all unanswered questions will be marked as incorrect.

  During the test, no hard copy or online materials may be referenced. As you can imagine, it is almost impossible to check if users reference these kind of materials. However, be aware of the penalty system that is in place during the test. When a user leaves from the active test screen to another screen (i.e. a different browser tab) the screen turns red and provides a warning count when the user returns to the test screen again. You will have three warnings, after this your test will be submitted and graded as false. Furthermore, keep in mind you will have to do the test in one go and cannot pause and come back another time.

  Practice makes perfect

  Below I have included some example questions that could be asked during the exam. These questions do not necessarily represent how Piwik will test you on these topics.

  • What is the default report date that is selected by Piwik ?
  • Why would someone flatten a report in Piwik ?
  • Why would a user especially use the Page Overlay report ?
  • What are the three main Ecommerce interactions tracked with Piwik ?
  • What is an example of an anonymized IP address in Piwik ?

  Passing the Piwik Certified Professional – Digital Analytics exam

  Directly after submitting the exam you will receive a notification telling you whether or not you have passed the exam. If you pass, you will be able to download your personal certification right away. A report of your exam performance will also be available. This report lists the amount of correct answers and total questions by topic. The report with your exam performance is also available if you did not pass the exam. The certificate is valid for 18 months from the date of successful completion.

  Sometimes the difference between passing and failing can be a matter of how you interpret some of Piwik’s questions. There are several tricky questions included, so be sure to pay attention to detail on every question. If you fail, you may take the exam again. You will have to pay the 50 USD fee for each try, so do your best to pass it the first time.

  → Register to become a Piwik Certified Professional.

  We wish you the best of luck and happy analytics !