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• How to fix : Frame rate differs from source after encoding certain mp4 videos to wmv

  25 juin 2019, par hpenhp

  I’m having trouble with a usually working ffmpeg script for encoding mp4 and more to wmv. The goal is to keep it like the original, except for the resolution (smaller) and the format (wmv).

  When it usually works for a lot of videos, on some of them it doesn’t... and i would like to understand and avoid that.

  I tried several things, forcing the framerate for the output, using -vsync 2 option, -vsync 0 also.. noone of that fixed the issue.

  An other thing, worth adding, is that the fps value from media info is good (24 fps) on the output like the input, but through the M$ windows explorer, it says 30 frames per sec, and when you play the video you see that the text that was matching the input doesn’t match the output any more (because of the fps mismatching).

  Below the script i use :

  ffmpeg -threads auto -i input.mp4 -s 480*320 -b:v 1000k -vcodec msmpeg4 -acodec wmav2 -f asf output.wmv

  Here is the ffmpeg log :

  ffmpeg version 3.4.1-1~16.04.york0 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.5) 20160609
  
    configuration: --prefix=/usr --extra-version='1~16.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    WARNING: library configuration mismatch
  
    avcodec     configuration: --prefix=/usr --extra-version='1~16.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './test_2k-24__hq_960x540.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41isomavc1
  
      creation_time   : 2019-05-27T14:37:50.000000Z
  
    Duration: 01:28:52.80, start: 0.000000, bitrate: 1232 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 960x540, 1091 kb/s, 24 fps, 24 tbr, 24 tbn, 48 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-05-27T14:37:50.000000Z
  
        handler_name    : L-SMASH Video Handler
  
        encoder         : AVC Coding
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 137 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-05-27T14:37:50.000000Z
  
        handler_name    : L-SMASH Audio Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> msmpeg4v3 (msmpeg4))
  
    Stream #0:1 -> #0:1 (aac (native) -> wmav2 (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, asf, to '/nas/copiedetravail/test_2k-24__hq_960x540.mp4.wmv':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41isomavc1
  
      WM/EncodingSettings: Lavf57.83.100
  
      Stream #0:0(und): Video: msmpeg4v3 (msmpeg4) (MP43 / 0x3334504D), yuv420p(progressive), 480x320, q=2-31, 1000 kb/s, 24 fps, 1k tbn, 24 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-05-27T14:37:50.000000Z
  
        handler_name    : L-SMASH Video Handler
  
        encoder         : Lavc57.107.100 msmpeg4
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/1000000 buffer size: 0 vbv_delay: -1
  
      Stream #0:1(und): Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-05-27T14:37:50.000000Z
  
        handler_name    : L-SMASH Audio Handler
  
        encoder         : Lavc57.107.100 wmav2
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
      Last message repeated 31 times
  
  frame=  228 fps=0.0 q=2.0 size=     291kB time=00:00:09.45 bitrate= 252.4kbits/s speed=18.9x    
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
      Last message repeated 1 times
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
      Last message repeated 1 times
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
      Last message repeated 1 times
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
      Last message repeated 5 times
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
      Last message repeated 2 times
  
  frame=  449 fps=449 q=2.0 size=     663kB time=00:00:18.98 bitrate= 286.2kbits/s speed=  19x    
  
  frame=  629 fps=418 q=1.6 size=    1307kB time=00:00:26.16 bitrate= 409.2kbits/s speed=17.4x    
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
      Last message repeated 30 times
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
      Last message repeated 7 times
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
      Last message repeated 2 times
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
      Last message repeated 34 times
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
      Last message repeated 1 times
  
  frame=  821 fps=410 q=2.0 size=    1960kB time=00:00:34.26 bitrate= 468.7kbits/s speed=17.1x    
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
      Last message repeated 71 times
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 2 dct coefficients to -127..127
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
      Last message repeated 82 times
  
  frame= 1026 fps=409 q=2.0 size=    2695kB time=00:00:42.96 bitrate= 513.8kbits/s speed=17.1x    
  
  [msmpeg4 @ 0x5648e407cb60] warning, clipping 1 dct coefficients to -127..127
  
      Last message repeated 102 times
  
  frame= 1202 fps=400 q=1.6 size=    3754kB time=00:00:50.13 bitrate= 613.4kbits/s speed=16.7x  
  
  ......
  
  frame=127987 fps=301 q=2.0 Lsize=  753842kB time=01:28:52.77 bitrate=1158.0kbits/s speed=12.6x    
  
  video:650704kB audio:83244kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.710554%

  EDIT :
  My workaround was to encode to MPEG, doing this, i’m able to read my file and the frame rate is same as source. If someone knows why it couldn’t keep the original framerate in wmv, i’m still interested to know.

• Could not write header for output file #0 (incorrect codec parameters ?) : No such file or directory

  1er juillet 2019, par playmaker420

  Im trying to trans code a mp4 file using the following command using a ffmpeg static build

  ./ffmpeg -i /tmp/tools/file_example.mp4 -map 0 -map 0 -map 0 -map 0 -c:v libx265 -f dash \
  
  -b:v:0 25M -b:v:1 15M -b:v:2 6M -b:v:3 1M -maxrate 25M -bufsize 1835k -s:v:0 3840x2160 \
  
  -s:v:1 3840x2160 -s:v:2 1920x1080 -s:v:3 1920x1080 -keyint_min 150 -g 150 \ /tmp/tools/example/4k.mpd

  On executing the command im getting the following exception

   ./ffmpeg -i /tmp/tools/file_example.mp4 -map 0 -map 0 -map 0 -map 0 -c:v libx265 -f dash -b:v:0 25M -b:v:1 15M -b:v:2 6M -b:v:3 1M -maxrate 25M -bufsize 1835k -s:v:0 3840x2160 -s:v:1 3840x2160 -s:v:2 1920x1080 -s:v:3 1920x1080 -keyint_min 150 -g 150 \ /tmp/tools/example/
  
  ffmpeg version 4.1.3-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  
    configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzvbi --enable-libzimg
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/tools/file_example.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41isomavc1
  
      creation_time   : 2015-08-07T09:13:36.000000Z
  
    Duration: 00:00:30.53, start: 0.000000, bitrate: 4675 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 4486 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-08-07T09:13:36.000000Z
  
        handler_name    : L-SMASH Video Handler
  
        encoder         : AVC Coding
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-08-07T09:13:36.000000Z
  
        handler_name    : L-SMASH Audio Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
    Stream #0:0 -> #0:2 (h264 (native) -> hevc (libx265))
  
    Stream #0:1 -> #0:3 (aac (native) -> aac (native))
  
    Stream #0:0 -> #0:4 (h264 (native) -> hevc (libx265))
  
    Stream #0:1 -> #0:5 (aac (native) -> aac (native))
  
    Stream #0:0 -> #0:6 (h264 (native) -> hevc (libx265))
  
    Stream #0:1 -> #0:7 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  x265 [info]: HEVC encoder version 3.0ed72af837053
  
  x265 [info]: build info [Linux][GCC 6.3.0][64 bit] 8bit+10bit+12bit
  
  x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  x265 [info]: Main profile, Level-5 (Main tier)
  
  x265 [info]: Thread pool created using 4 threads
  
  x265 [info]: Slices                              : 1
  
  x265 [info]: frame threads / pool features       : 2 / wpp(34 rows)
  
  x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
  
  x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
  
  x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 2
  
  x265 [info]: Keyframe min / max / scenecut / bias: 25 / 250 / 40 / 5.00
  
  x265 [info]: Lookahead / bframes / badapt        : 20 / 4 / 2
  
  x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
  
  x265 [info]: References / ref-limit  cu / depth  : 3 / on / on
  
  x265 [info]: AQ: mode / str / qg-size / cu-tree  : 2 / 1.0 / 32 / 1
  
  x265 [info]: Rate Control / qCompress            : ABR-25000 kbps / 0.60
  
  x265 [info]: VBV/HRD buffer / max-rate / init    : 1835 / 25000 / 0.750
  
  x265 [info]: tools: rd=3 psy-rd=2.00 rskip signhide tmvp strong-intra-smoothing
  
  x265 [info]: tools: lslices=8 deblock sao
  
  x265 [info]: HEVC encoder version 3.0ed72af837053
  
  x265 [info]: build info [Linux][GCC 6.3.0][64 bit] 8bit+10bit+12bit
  
  x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  x265 [info]: Main profile, Level-5 (Main tier)
  
  x265 [info]: Thread pool created using 4 threads
  
  x265 [info]: Slices                              : 1
  
  x265 [info]: frame threads / pool features       : 2 / wpp(34 rows)
  
  x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
  
  x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
  
  x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 2
  
  x265 [info]: Keyframe min / max / scenecut / bias: 25 / 250 / 40 / 5.00
  
  x265 [info]: Lookahead / bframes / badapt        : 20 / 4 / 2
  
  x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
  
  x265 [info]: References / ref-limit  cu / depth  : 3 / on / on
  
  x265 [info]: AQ: mode / str / qg-size / cu-tree  : 2 / 1.0 / 32 / 1
  
  x265 [info]: Rate Control / qCompress            : ABR-15000 kbps / 0.60
  
  x265 [info]: VBV/HRD buffer / max-rate / init    : 1835 / 25000 / 0.750
  
  x265 [info]: tools: rd=3 psy-rd=2.00 rskip signhide tmvp strong-intra-smoothing
  
  x265 [info]: tools: lslices=8 deblock sao
  
  x265 [info]: HEVC encoder version 3.0ed72af837053
  
  x265 [info]: build info [Linux][GCC 6.3.0][64 bit] 8bit+10bit+12bit
  
  x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  x265 [info]: Main profile, Level-4 (High tier)
  
  x265 [info]: Thread pool created using 4 threads
  
  x265 [info]: Slices                              : 1
  
  x265 [info]: frame threads / pool features       : 2 / wpp(17 rows)
  
  x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
  
  x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
  
  x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 2
  
  x265 [info]: Keyframe min / max / scenecut / bias: 25 / 250 / 40 / 5.00
  
  x265 [info]: Lookahead / bframes / badapt        : 20 / 4 / 2
  
  x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
  
  x265 [info]: References / ref-limit  cu / depth  : 3 / on / on
  
  x265 [info]: AQ: mode / str / qg-size / cu-tree  : 2 / 1.0 / 32 / 1
  
  x265 [info]: Rate Control / qCompress            : ABR-6000 kbps / 0.60
  
  x265 [info]: VBV/HRD buffer / max-rate / init    : 1835 / 25000 / 0.750
  
  x265 [info]: tools: rd=3 psy-rd=2.00 rskip signhide tmvp strong-intra-smoothing
  
  x265 [info]: tools: lslices=6 deblock sao
  
  x265 [info]: HEVC encoder version 3.0ed72af837053
  
  x265 [info]: build info [Linux][GCC 6.3.0][64 bit] 8bit+10bit+12bit
  
  x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  x265 [info]: Main profile, Level-4 (High tier)
  
  x265 [info]: Thread pool created using 4 threads
  
  x265 [info]: Slices                              : 1
  
  x265 [info]: frame threads / pool features       : 2 / wpp(17 rows)
  
  x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
  
  x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
  
  x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 2
  
  x265 [info]: Keyframe min / max / scenecut / bias: 25 / 250 / 40 / 5.00
  
  x265 [info]: Lookahead / bframes / badapt        : 20 / 4 / 2
  
  x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
  
  x265 [info]: References / ref-limit  cu / depth  : 3 / on / on
  
  x265 [info]: AQ: mode / str / qg-size / cu-tree  : 2 / 1.0 / 32 / 1
  
  x265 [info]: Rate Control / qCompress            : ABR-1000 kbps / 0.60
  
  x265 [info]: VBV/HRD buffer / max-rate / init    : 1835 / 25000 / 0.750
  
  x265 [info]: tools: rd=3 psy-rd=2.00 rskip signhide tmvp strong-intra-smoothing
  
  x265 [info]: tools: lslices=6 deblock sao
  
  [dash @ 0x5f21000] Opening ' /tmp/tools/example/init-stream0.m4s' for writingtrate=N/A speed=N/A    
  
  Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory
  
  Error initializing output stream 0:7 -- 
  
  x265 [info]: consecutive B-frames: 100.0% 0.0% 0.0% 0.0% 0.0% 
  
  
  
  encoded 0 frames
  
  [aac @ 0x5f30d00] Qavg: -nan
  
  [aac @ 0x5f30d00] 1 frames left in the queue on closing
  
  x265 [info]: consecutive B-frames: 100.0% 0.0% 0.0% 0.0% 0.0% 
  
  
  
  encoded 0 frames
  
  [aac @ 0x5f24ac0] Qavg: -nan
  
  [aac @ 0x5f24ac0] 1 frames left in the queue on closing
  
  x265 [info]: consecutive B-frames: 100.0% 0.0% 0.0% 0.0% 0.0% 
  
  
  
  encoded 0 frames
  
  [aac @ 0x5f33ec0] Qavg: -nan
  
  [aac @ 0x5f33ec0] 1 frames left in the queue on closing
  
  x265 [info]: consecutive B-frames: 100.0% 0.0% 0.0% 0.0% 0.0% 
  
  
  
  encoded 0 frames
  
  [aac @ 0x5f434c0] Qavg: -nan
  
  Conversion failed!

  ffmpeg -version

  ./ffmpeg -version
  
  ffmpeg version 4.1.3-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2019 the FFmpeg developers
  
  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzvbi --enable-libzimg
  
  libavutil      56. 22.100 / 56. 22.100
  
  libavcodec     58. 35.100 / 58. 35.100
  
  libavformat    58. 20.100 / 58. 20.100
  
  libavdevice    58.  5.100 / 58.  5.100
  
  libavfilter     7. 40.101 /  7. 40.101
  
  libswscale      5.  3.100 /  5.  3.100
  
  libswresample   3.  3.100 /  3.  3.100
  
  libpostproc    55.  3.100 / 55.  3.100

  Can someone help me to rectify the issue ?

• How to analyse 404 pages

  1er juillet 2019, par Matomo Core Team — Development, Plugins

  How to analyse “not found” pages (404) in digital analytics

  Have you ever sent out a newsletter and one link wasn’t active yet ? Would you like to know how many users get affected when this happens ? Would you like to know if your visitors are encountering 404 pages ? 

  In this article we’re describing an easy way to analyse “not found” pages on your website with Matomo to increase your visitors’ user experience, user acquisition, and SEO (search engine optimization).

  How to know the number of 404s on my website ?

  There are different ways to get this information. Depending on how your website is built, you may or may not collect this data.

  The easiest way to answer this question is to fire a 404 page on your website, you do this by accessing a wrong url :

  

  As you can see here, in our case, the page title starts with “Page non trouvée” which stands for “Page not found” when translated in English (as the website we are considering here is in French) :

  

  In this example 19 page views have been fired and it generated a bounce rate of 67%. As a result ⅔ of the visits ended here.

  In some cases, the information related to a “not found” page can be found either within the title or within the URL, as some websites redirect you to a specific web page when a page can’t be found.

  If you can’t identify “not found” pages via a page title or a page URL, we strongly advise you to use this specific tracking code method on your 404 page : “How to track error pages in Matomo ?”. 

  You can easily set it with Matomo Tag Manager with a custom HTML tag :

  

  where the trigger is the following :

  

  You will however, have to define this trigger as an exclusion for all the other tags which may conflict with it (here below is the new trigger defined for the generic Matomo tags we are inserting on all pages) :

  

  Once this specific tracking is set, you will be able to track the source of the 404 and will gather all the “not found” pages in a specific group within your Page Title report :

  

  Here, for example, you can identify that the homepage of this website had a link pointing to a 404, in our case it was https://www.webassoc.org/pro-du-web.

  Note that this is just one technique. You could also create a custom dimension report and decide to send the 404 there also.

  How to get notified when a 404 page is visited ?

  Trust us, you’re not going to check everyday whether a 404 page has been visited. In order to avoid checking it manually, you can define custom alerts.

  There are three possible scenarios when “not found” pages can be fired :

  • internal 404 : one link within your website is pointing to a wrong url on the same website.
  • external 404 : someone from an external website made a link to yours and the link is not correct.
  • direct access 404 : someone access directly to a not found page on your website.

  You can define all those three within Matomo, but in your case, you will only have to focus on the first two only. In fact, you can’t really fix the third scenario. That’s the reason why we’re not focusing on it. It would result in irrelevant alerts.

  Custom alert for internal 404

  An internal 404 is defined from a 404 where the source is an internal web page. As a result, it will look like the following in your report :

  

  In this example, we’re using this specific custom implementation, the title of the page will contain “From = https://www.webassoc.org/”. So set our custom alert accordingly :

  

  Now every time a 404 page will be fired from an internal page, you’ll be notified by email.

  Note that you can also decide to not receive any email and track the evolution of alerts with the History of triggered alerts feature.

  Custom alert for external 404

  External 404 is almost the same setup. The only thing you need to keep in mind is that we want to exclude the 404 where the source is not indicated. As a result, your configuration will look like the following :

  

  Here your regular expression pattern is the following one :

  404/URL = .*From = (?!https://www.webassoc.org)[^\s]+

  as you’ll want to have any referrer coming from a website which is not Matomo and not a direct 404.

   

  You can now be notified every time that a 404 is fired from any link.

  Note that this configuration may slightly differ from website to website. So always double check your tracking code and the way the values are sent to your reports. Also try to trigger those alerts first before validating them.

  How to follow the evolution of your 404 over time ?

  It may be interesting to know how good or how bad you are performing in terms of 404.

  In order to check this information, you can click on the evolution icon near the 404 title :

  

  But you may be interested in accessing this information more regularly without having to create this report each time.

  So, one way to analyse the evolution of your 404 is to create a segment such as :

  

  and to click after that on evolution icon :

  

  As you can see below the number of “not found” pages is quite low in general, but we can also notice that a period received an increase in terms of 404 not found pages on May 27. It may be interesting to investigate it :

  

  You can start from the overview of referrers :

  

  As you can notice here the main source of 404 is coming from direct entries which is the most difficult channel to analyse as we don’t really know where the visitors are coming from.

  How to perform your analysis even faster ?

  As you can see analysing reports in Matomo in order to detect 404 pages is a time-consuming activity. In order to make it faster, you can already create a report about it within the Email reports feature with the following settings :

  • Segment : 404
  • Email schedule : never.
  • Visits summary and Page titles as selected report.

  You will then end up with a saved report listing all the URLs concerned :

  

  You can also have a look at the “Custom reports” premium feature.

  It will provide you with more flexibility. You will then be able to focus on the most important thing : the cause of 404.

  Good luck and happy analytics !