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  • ffmpeg concat video length is not the sum of durations

    9 novembre 2019, par Mason

    I’m simply trying to put some images together into a video with specific durations. I’m using the command

    ffmpeg -f concat -i concat.txt -r 30 video.mp4
    # concat.txt
    

    
file capture12.png
    
duration 1
    
file capture57.png
    
duration 3
    
file capture156.png
    
duration 7
    
file capture234.png
    
duration 5
    
file capture272.png
    
duration 3

    The output of my console is

    ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with gcc 9.1.1 (GCC) 20190807
    
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
    
  libavutil      56. 31.100 / 56. 31.100
    
  libavcodec     58. 54.100 / 58. 54.100
    
  libavformat    58. 29.100 / 58. 29.100
    
  libavdevice    58.  8.100 / 58.  8.100
    
  libavfilter     7. 57.100 /  7. 57.100
    
  libswscale      5.  5.100 /  5.  5.100
    
  libswresample   3.  5.100 /  3.  5.100
    
  libpostproc    55.  5.100 / 55.  5.100
    
Input #0, concat, from 'concat.txt':
    
  Duration: 00:00:19.00, start: 0.000000, bitrate: 0 kb/s
    
    Stream #0:0: Video: png, rgba(pc), 983x553, 25 tbr, 25 tbn, 25 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
    
Press [q] to stop, [?] for help
    
[libx264 @ 000001b3e55c5c80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
    
[libx264 @ 000001b3e55c5c80] profile High 4:4:4 Predictive, level 3.1, 4:4:4, 8-bit
    
[libx264 @ 000001b3e55c5c80] 264 - core 158 r2984 3759fcb - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - 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=4 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
Output #0, mp4, to 'video.mp4':
    
  Metadata:
    
    encoder         : Lavf58.29.100
    
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 983x553, q=-1--1, 30 fps, 15360 tbn, 30 tbc
    
    Metadata:
    
      encoder         : Lavc58.54.100 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
frame=  629 fps=400 q=-1.0 Lsize=     124kB time=00:00:20.86 bitrate=  48.8kbits/s dup=624 drop=0 speed=13.3x
    
video:116kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 7.050883%
    
[libx264 @ 000001b3e55c5c80] frame I:3     Avg QP:13.09  size: 20222
    
[libx264 @ 000001b3e55c5c80] frame P:158   Avg QP:10.80  size:   207
    
[libx264 @ 000001b3e55c5c80] frame B:468   Avg QP:13.75  size:    53
    
[libx264 @ 000001b3e55c5c80] consecutive B-frames:  0.8%  0.0%  0.0% 99.2%
    
[libx264 @ 000001b3e55c5c80] mb I  I16..4: 23.0% 58.6% 18.4%
    
[libx264 @ 000001b3e55c5c80] mb P  I16..4:  0.0%  0.0%  0.2%  P16..4:  0.1%  0.0%  0.0%  0.0%  0.0%    skip:99.7%
    
[libx264 @ 000001b3e55c5c80] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  1.3%  0.0%  0.0%  direct: 0.0%  skip:98.7%  L0:66.5% L1:33.5% BI: 0.0%
    
[libx264 @ 000001b3e55c5c80] 8x8 transform intra:54.0% inter:7.4%
    
[libx264 @ 000001b3e55c5c80] coded y,u,v intra: 15.3% 0.7% 0.7% inter: 0.0% 0.0% 0.0%
    
[libx264 @ 000001b3e55c5c80] i16 v,h,dc,p: 86% 14%  0%  0%
    
[libx264 @ 000001b3e55c5c80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 65%  7% 28%  0%  0%  0%  0%  0%  0%
    
[libx264 @ 000001b3e55c5c80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 50% 14% 14%  3%  4%  5%  4%  4%  3%
    
[libx264 @ 000001b3e55c5c80] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 000001b3e55c5c80] ref P L0: 87.3%  6.3%  5.6%  0.8%
    
[libx264 @ 000001b3e55c5c80] ref B L0: 45.3% 54.3%  0.4%
    
[libx264 @ 000001b3e55c5c80] ref B L1: 99.6%  0.4%
    
[libx264 @ 000001b3e55c5c80] kb/s:45.07

    I can see it clearly saying Duration 00:00:19.00 (as it should be) and then later saying that the final video is 00:00:20.86. How do I get these numbers to match ?

  • ffmpeg mp4 x264 encoding -> playback causes "pending" in both Chrome and IE causing 10+ seconds delay

    26 novembre 2015, par user1978645

    After encoding a video to mp4(x264 with aac) ; I have the following weird behaviour in both crome and IE :

    Im serving the content from https with spdy enables.

    It takes up to 30 seconds before the video is actually played, in the mean time i cannot reload the page it shows up as "pending". (even after i have visual on the video sometimes it takes 10-20 seconds before i can actually reload the page, or navigate to another url on the same domain)

    After looking at the "network" tab in developer tools, i see the following requests for 1 page/video :

    Path        Method Status   Type         Initiator   Size/content  Time/latency
    
video.mp4   GET    206 OK   video/mp4    other       32.3KB/32.0kb  600ms/339MS 
    
video.mp4   GET    206 OK   video/mp4    other       123kb/123b     21.85s/21.46s
    
video.mp4   GET    206 OK   video/mp4    other       7.1MB/7.2MB    1.4min/2ms

    I tried to isolate the problem, When i use an mp4 video from the internet (for example the demo video of jplayer) and load it from my server, it loads rapidly, without delays.

    So it makes me think the problem lies within the encoding. I tried various things.
    FFmpeg :

    • csr 69 (low quality)

    • various options

    HTML :

    • preload="none"

    • javascript loading/playing of the movie

    • type=’mp4/video’

    • no posterimage

    But i cannot resolve the problem. Does anyone have a clue what is causing this ?

    I have a download speed of 300kb/s and the movie is 6MB.

    After the video starts, the video isn’t fully buffered, so i wonder : What is the html5 videoplayer doing all this time ?

    The problem also blocks the connections. When i press "F5" in both chrome and IE the page beeing reloaded comes up in the network tab as "pending" and it can take 10 to 20 seconds before the page actually reloads.

    ffmpeg command : (i used various commands but this is just 1 example which causes the problem)

    /root/bin/ffmpeg    -threads 1 -y  -i /home/flirtzo/public_html//userfiles/files/94e76a18a7838e62ecb23cf0c374b1b798e7b936  -threads 0 -codec:a libfdk_aac -b:a 128k  -vf "scale=-2:320" -preset veryslow -vcodec h264 -acodec aac -strict -2  /home/flirtzo/public_html/userfiles/files/b2/72/695f4eba95169a3f29564bf9571c703b05f1b5974f5156da633eb139c80a1575452e2858dfc61cc82bfca02d2b156aa64d4503695756481dc2a5d1c673a4cdea-94e76a18a7838e62ecb23cf0c374b1b798e7b936.mp4

    Output :

    ffmpeg version git-2014-04-16-c150e2c Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Sep 28 2014 21:08:17 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4)
    
  configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-        ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree -    -enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-    libx264
    
  libavutil      52. 76.100 / 52. 76.100
    
  libavcodec     55. 58.103 / 55. 58.103
    
  libavformat    55. 37.100 / 55. 37.100
    
  libavdevice    55. 13.100 / 55. 13.100
    
  libavfilter     4.  4.100 /  4.  4.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mpeg, from         '/home/flirtzo/public_html//userfiles/files/94e76a18a7838e62ecb23cf0c374b1b798e7b936':
    
  Duration: 00:00:25.97, start: 0.340078, bitrate: 29004 kb/s
    
    Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 352x240 [SAR 200:219 DAR 880:657], 1150     kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc
    
    Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16p, 224 kb/s
    
[libx264 @ 0x2b189c0] using SAR=1199/1314
    
[libx264 @ 0x2b189c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x2b189c0] profile High, level 1.3
    
[libx264 @ 0x2b189c0] 264 - core 142 r2 d6b4e63 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 -     http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex     subme=4 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0     deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=1 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=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0     rc_lookahead=20 rc=crf mbtree=1 crf=51.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
Output #0, mp4, to     '/home/flirtzo/public_html/userfiles/files/b2/72/695f4eba95169a3f29564bf9571c703b05f1b5974f5156da633e    b139c80a1575452e2858dfc61cc82bfca02d2b156aa64d4503695756481dc2a5d1c673a4cdea-    94e76a18a7838e62ecb23cf0c374b1b798e7b936.mp4':
    
  Metadata:
    
    encoder         : Lavf55.37.100
    
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 320x218 [SAR 1199:1314        DAR 880:657], q=-1--1, 30k tbn, 29.97 tbc
    
    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg1video -> libx264)
    
  Stream #0:1 -> #0:1 (mp2 -> aac)
    
Press [q] to stop, [?] for help
    
frame=16127 fps=786 q=-1.0 Lsize=   10559kB time=00:08:58.12 bitrate= 160.7kbits/s dup=12 drop=0
    
video:1586kB audio:8410kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:     5.638589%
    
[libx264 @ 0x2b189c0] frame I:109   Avg QP:50.58  size:   494
    
[libx264 @ 0x2b189c0] frame P:9537  Avg QP:51.00  size:   138
    
[libx264 @ 0x2b189c0] frame B:6481  Avg QP:51.00  size:    40
    
[libx264 @ 0x2b189c0] consecutive B-frames: 21.8% 72.1%  5.4%  0.7%
    
[libx264 @ 0x2b189c0] mb I  I16..4: 46.1% 53.9%  0.0%
    
[libx264 @ 0x2b189c0] mb P  I16..4:  6.0%  6.1%  0.0%  P16..4: 12.7%  1.1%  0.1%  0.0%  0.0%        skip:74.1%
    
[libx264 @ 0x2b189c0] mb B  I16..4:  0.1%  0.1%  0.0%  B16..8:  6.3%  0.0%  0.0%  direct: 0.7%      skip:92.9%  L0:38.6% L1:61.2% BI: 0.2%
    
[libx264 @ 0x2b189c0] 8x8 transform intra:50.8% inter:85.6%
    
[libx264 @ 0x2b189c0] coded y,uvDC,uvAC intra: 5.9% 39.5% 0.1% inter: 0.1% 1.0% 0.0%
    
[libx264 @ 0x2b189c0] i16 v,h,dc,p: 56% 30%  7%  7%
    
[libx264 @ 0x2b189c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 11% 62%  3%  3%  3%  3%  2%  2%
    
[libx264 @ 0x2b189c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19%  5% 73%  2%  0%  0%  0%  0%  2%
    
[libx264 @ 0x2b189c0] i8c dc,h,v,p: 97%  1%  2%  0%
    
[libx264 @ 0x2b189c0] Weighted P-Frames: Y:5.5% UV:2.7%
    
[libx264 @ 0x2b189c0] ref P L0: 64.8% 35.2%
    
[libx264 @ 0x2b189c0] ref B L0: 75.2% 24.8%
    
[libx264 @ 0x2b189c0] ref B L1: 99.3%  0.7%
    
[libx264 @ 0x2b189c0] kb/s:24.13
    
ffmpeg version git-2014-04-16-c150e2c Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Sep 28 2014 21:08:17 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4)
    
  configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-    ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree -    -enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-    libx264
    
  libavutil      52. 76.100 / 52. 76.100
    
  libavcodec     55. 58.103 / 55. 58.103
    
  libavformat    55. 37.100 / 55. 37.100
    
  libavdevice    55. 13.100 / 55. 13.100
    
  libavfilter     4.  4.100 /  4.  4.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mpeg, from     '/home/flirtzo/public_html//userfiles/files/94e76a18a7838e62ecb23cf0c374b1b798e7b936':
    
  Duration: 00:00:25.97, start: 0.340078, bitrate: 29004 kb/s
    
    Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 352x240 [SAR 200:219 DAR 880:657], 1150         kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc
    
    Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16p, 224 kb/s
    
[libx264 @ 0x300d9c0] using SAR=200/219
    
[libx264 @ 0x300d9c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x300d9c0] profile High, level 2.2
    
[libx264 @ 0x300d9c0] 264 - core 142 r2 d6b4e63 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 -                     http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh         subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0     deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=1 sliced_threads=0 nr=0     decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0     direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0     rc_lookahead=60 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
Output #0, mp4, to     '/home/flirtzo/public_html/userfiles/files/b2/72/73d4a3245c0b0e174ab7ce0f872ba3f649f8b93f73a6deeab364    4a994009d73638ce61aecc7dc2e0250c4e74ff2d9a4d479ed35cef26b3f6e1a77e8bf5938518-    94e76a18a7838e62ecb23cf0c374b1b798e7b936.mp4':
    
  Metadata:
    
    encoder         : Lavf55.37.100
    
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 352x240 [SAR 200:219     DAR 880:657], q=-1--1, 30k tbn, 29.97 tbc
    
    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg1video -> libx264)
    
  Stream #0:1 -> #0:1 (mp2 -> aac)
    
   Press [q] to stop, [?] for help
    
frame=16127 fps= 88 q=-1.0 Lsize=   29190kB time=00:08:58.12 bitrate= 444.4kbits/s dup=12 drop=0
    
video:20221kB audio:8410kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:     1.954086%
    
[libx264 @ 0x300d9c0] frame I:73    Avg QP:24.31  size:  8024
    
[libx264 @ 0x300d9c0] frame P:4399  Avg QP:26.97  size:  2600
    
[libx264 @ 0x300d9c0] frame B:11655 Avg QP:32.51  size:   745
    
[libx264 @ 0x300d9c0] consecutive B-frames:  3.8%  5.0% 27.2% 18.4%  8.4% 33.9%  1.7%  0.7%  0.9%
    
[libx264 @ 0x300d9c0] mb I  I16..4: 10.8% 68.5% 20.7%
    
[libx264 @ 0x300d9c0] mb P  I16..4:  2.9%  7.5%  0.8%  P16..4: 45.1% 18.4% 12.4%  0.5%  0.1%        skip:12.3%
    
[libx264 @ 0x300d9c0] mb B  I16..4:  0.6%  1.3%  0.1%  B16..8: 40.1%  8.7%  1.7%  direct: 2.1%      skip:45.5%  L0:47.2% L1:41.7% BI:11.1%
    
[libx264 @ 0x300d9c0] 8x8 transform intra:66.7% inter:76.7%
    
[libx264 @ 0x300d9c0] direct mvs  spatial:99.9% temporal:0.1%
    
[libx264 @ 0x300d9c0] coded y,uvDC,uvAC intra: 60.3% 75.8% 16.4% inter: 17.3% 16.8% 0.6%
    
[libx264 @ 0x300d9c0] i16 v,h,dc,p: 16% 27% 11% 47%
    
[libx264 @ 0x300d9c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 13% 18%  6%  9%  9% 11%  9% 11%
    
[libx264 @ 0x300d9c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 15%  7%  7% 14% 14% 13%  8% 10%
    
[libx264 @ 0x300d9c0] i8c dc,h,v,p: 26% 32% 20% 22%
    
[libx264 @ 0x300d9c0] Weighted P-Frames: Y:10.1% UV:6.9%
    
[libx264 @ 0x300d9c0] ref P L0: 40.6% 12.1% 10.0%  5.2%  5.2%  4.7%  4.6%  3.0%  2.5%  2.1%  1.9%      1.8%  1.7%  1.7%  1.6%  1.3%
    
[libx264 @ 0x300d9c0] ref B L0: 71.4%  5.6%  3.2%  3.0%  3.1%  2.8%  2.5%  1.8%  1.3%  1.0%  1.1%      1.2%  1.0%  0.7%  0.5%
    
[libx264 @ 0x300d9c0] ref B L1: 96.3%  3.7%
    
[libx264 @ 0x300d9c0] kb/s:307.82

  • ffmpeg mp4 x264 encoding -> playback causes "pending" in both crome and IE causing 10+ seconds delay

    29 septembre 2014, par user1978645

    After encoding a video to mp4(x264 with aac) ; I have the following weird behaviour in both crome and IE :

    Im serving the content from https with spdy enables.

    It takes up to 30 seconds before the video is actually played, in the mean time i cannot reload the page it shows up as "pending". (even after i have visual on the video sometimes it takes 10-20 seconds before i can actually reload the page, or navigate to another url on the same domain)

    After looking at the "network" tab in developer tools, i see the following requests for 1 page/video :

    Path        Method Status   Type         Initiator   Size/content  Time/latency
    
video.mp4   GET    206 OK   video/mp4    other       32.3KB/32.0kb  600ms/339MS 
    
video.mp4   GET    206 OK   video/mp4    other       123kb/123b     21.85s/21.46s
    
video.mp4   GET    206 OK   video/mp4    other       7.1MB/7.2MB    1.4min/2ms

    I tried to isolate the problem, When i use an mp4 video from the internet (for example the demo video of jplayer) and load it from my server, it loads rapidly, without delays.

    So it makes me think the problem lies within the encoding. I tried various things.
    FFmpeg :

    • csr 69 (low quality)

    • various options

    HTML :

    • preload="none"

    • javascript loading/playing of the movie

    • type=’mp4/video’

    • no posterimage

    But i cannot resolve the problem. Does anyone have a clue what is causing this ?

    I have a download speed of 300kb/s and the movie is 6MB.

    After the video starts, the video isn’t fully buffered, so i wonder : What is the html5 videoplayer doing all this time ?

    The problem also blocks the connections. When i press "F5" in both chrome and IE the page beeing reloaded comes up in the network tab as "pending" and it can take 10 to 20 seconds before the page actually reloads.

    ffmpeg command : (i used various commands but this is just 1 example which causes the problem)

    /root/bin/ffmpeg    -threads 1 -y  -i /home/flirtzo/public_html//userfiles/files/94e76a18a7838e62ecb23cf0c374b1b798e7b936  -threads 0 -codec:a libfdk_aac -b:a 128k  -vf "scale=-2:320" -preset veryslow -vcodec h264 -acodec aac -strict -2  /home/flirtzo/public_html/userfiles/files/b2/72/695f4eba95169a3f29564bf9571c703b05f1b5974f5156da633eb139c80a1575452e2858dfc61cc82bfca02d2b156aa64d4503695756481dc2a5d1c673a4cdea-94e76a18a7838e62ecb23cf0c374b1b798e7b936.mp4

    Output :

    ffmpeg version git-2014-04-16-c150e2c Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Sep 28 2014 21:08:17 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4)
    
  configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-        ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree -    -enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-    libx264
    
  libavutil      52. 76.100 / 52. 76.100
    
  libavcodec     55. 58.103 / 55. 58.103
    
  libavformat    55. 37.100 / 55. 37.100
    
  libavdevice    55. 13.100 / 55. 13.100
    
  libavfilter     4.  4.100 /  4.  4.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mpeg, from         '/home/flirtzo/public_html//userfiles/files/94e76a18a7838e62ecb23cf0c374b1b798e7b936':
    
  Duration: 00:00:25.97, start: 0.340078, bitrate: 29004 kb/s
    
    Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 352x240 [SAR 200:219 DAR 880:657], 1150     kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc
    
    Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16p, 224 kb/s
    
[libx264 @ 0x2b189c0] using SAR=1199/1314
    
[libx264 @ 0x2b189c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x2b189c0] profile High, level 1.3
    
[libx264 @ 0x2b189c0] 264 - core 142 r2 d6b4e63 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 -     http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex     subme=4 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0     deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=1 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=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0     rc_lookahead=20 rc=crf mbtree=1 crf=51.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
Output #0, mp4, to     '/home/flirtzo/public_html/userfiles/files/b2/72/695f4eba95169a3f29564bf9571c703b05f1b5974f5156da633e    b139c80a1575452e2858dfc61cc82bfca02d2b156aa64d4503695756481dc2a5d1c673a4cdea-    94e76a18a7838e62ecb23cf0c374b1b798e7b936.mp4':
    
  Metadata:
    
    encoder         : Lavf55.37.100
    
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 320x218 [SAR 1199:1314        DAR 880:657], q=-1--1, 30k tbn, 29.97 tbc
    
    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg1video -> libx264)
    
  Stream #0:1 -> #0:1 (mp2 -> aac)
    
Press [q] to stop, [?] for help
    
frame=16127 fps=786 q=-1.0 Lsize=   10559kB time=00:08:58.12 bitrate= 160.7kbits/s dup=12 drop=0
    
video:1586kB audio:8410kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:     5.638589%
    
[libx264 @ 0x2b189c0] frame I:109   Avg QP:50.58  size:   494
    
[libx264 @ 0x2b189c0] frame P:9537  Avg QP:51.00  size:   138
    
[libx264 @ 0x2b189c0] frame B:6481  Avg QP:51.00  size:    40
    
[libx264 @ 0x2b189c0] consecutive B-frames: 21.8% 72.1%  5.4%  0.7%
    
[libx264 @ 0x2b189c0] mb I  I16..4: 46.1% 53.9%  0.0%
    
[libx264 @ 0x2b189c0] mb P  I16..4:  6.0%  6.1%  0.0%  P16..4: 12.7%  1.1%  0.1%  0.0%  0.0%        skip:74.1%
    
[libx264 @ 0x2b189c0] mb B  I16..4:  0.1%  0.1%  0.0%  B16..8:  6.3%  0.0%  0.0%  direct: 0.7%      skip:92.9%  L0:38.6% L1:61.2% BI: 0.2%
    
[libx264 @ 0x2b189c0] 8x8 transform intra:50.8% inter:85.6%
    
[libx264 @ 0x2b189c0] coded y,uvDC,uvAC intra: 5.9% 39.5% 0.1% inter: 0.1% 1.0% 0.0%
    
[libx264 @ 0x2b189c0] i16 v,h,dc,p: 56% 30%  7%  7%
    
[libx264 @ 0x2b189c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 11% 62%  3%  3%  3%  3%  2%  2%
    
[libx264 @ 0x2b189c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19%  5% 73%  2%  0%  0%  0%  0%  2%
    
[libx264 @ 0x2b189c0] i8c dc,h,v,p: 97%  1%  2%  0%
    
[libx264 @ 0x2b189c0] Weighted P-Frames: Y:5.5% UV:2.7%
    
[libx264 @ 0x2b189c0] ref P L0: 64.8% 35.2%
    
[libx264 @ 0x2b189c0] ref B L0: 75.2% 24.8%
    
[libx264 @ 0x2b189c0] ref B L1: 99.3%  0.7%
    
[libx264 @ 0x2b189c0] kb/s:24.13
    
ffmpeg version git-2014-04-16-c150e2c Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Sep 28 2014 21:08:17 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4)
    
  configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-    ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree -    -enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-    libx264
    
  libavutil      52. 76.100 / 52. 76.100
    
  libavcodec     55. 58.103 / 55. 58.103
    
  libavformat    55. 37.100 / 55. 37.100
    
  libavdevice    55. 13.100 / 55. 13.100
    
  libavfilter     4.  4.100 /  4.  4.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mpeg, from     '/home/flirtzo/public_html//userfiles/files/94e76a18a7838e62ecb23cf0c374b1b798e7b936':
    
  Duration: 00:00:25.97, start: 0.340078, bitrate: 29004 kb/s
    
    Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 352x240 [SAR 200:219 DAR 880:657], 1150         kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc
    
    Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16p, 224 kb/s
    
[libx264 @ 0x300d9c0] using SAR=200/219
    
[libx264 @ 0x300d9c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x300d9c0] profile High, level 2.2
    
[libx264 @ 0x300d9c0] 264 - core 142 r2 d6b4e63 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 -                     http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh         subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0     deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=1 sliced_threads=0 nr=0     decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0     direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0     rc_lookahead=60 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
Output #0, mp4, to     '/home/flirtzo/public_html/userfiles/files/b2/72/73d4a3245c0b0e174ab7ce0f872ba3f649f8b93f73a6deeab364    4a994009d73638ce61aecc7dc2e0250c4e74ff2d9a4d479ed35cef26b3f6e1a77e8bf5938518-    94e76a18a7838e62ecb23cf0c374b1b798e7b936.mp4':
    
  Metadata:
    
    encoder         : Lavf55.37.100
    
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 352x240 [SAR 200:219     DAR 880:657], q=-1--1, 30k tbn, 29.97 tbc
    
    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg1video -> libx264)
    
  Stream #0:1 -> #0:1 (mp2 -> aac)
    
   Press [q] to stop, [?] for help
    
frame=16127 fps= 88 q=-1.0 Lsize=   29190kB time=00:08:58.12 bitrate= 444.4kbits/s dup=12 drop=0
    
video:20221kB audio:8410kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:     1.954086%
    
[libx264 @ 0x300d9c0] frame I:73    Avg QP:24.31  size:  8024
    
[libx264 @ 0x300d9c0] frame P:4399  Avg QP:26.97  size:  2600
    
[libx264 @ 0x300d9c0] frame B:11655 Avg QP:32.51  size:   745
    
[libx264 @ 0x300d9c0] consecutive B-frames:  3.8%  5.0% 27.2% 18.4%  8.4% 33.9%  1.7%  0.7%  0.9%
    
[libx264 @ 0x300d9c0] mb I  I16..4: 10.8% 68.5% 20.7%
    
[libx264 @ 0x300d9c0] mb P  I16..4:  2.9%  7.5%  0.8%  P16..4: 45.1% 18.4% 12.4%  0.5%  0.1%        skip:12.3%
    
[libx264 @ 0x300d9c0] mb B  I16..4:  0.6%  1.3%  0.1%  B16..8: 40.1%  8.7%  1.7%  direct: 2.1%      skip:45.5%  L0:47.2% L1:41.7% BI:11.1%
    
[libx264 @ 0x300d9c0] 8x8 transform intra:66.7% inter:76.7%
    
[libx264 @ 0x300d9c0] direct mvs  spatial:99.9% temporal:0.1%
    
[libx264 @ 0x300d9c0] coded y,uvDC,uvAC intra: 60.3% 75.8% 16.4% inter: 17.3% 16.8% 0.6%
    
[libx264 @ 0x300d9c0] i16 v,h,dc,p: 16% 27% 11% 47%
    
[libx264 @ 0x300d9c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 13% 18%  6%  9%  9% 11%  9% 11%
    
[libx264 @ 0x300d9c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 15%  7%  7% 14% 14% 13%  8% 10%
    
[libx264 @ 0x300d9c0] i8c dc,h,v,p: 26% 32% 20% 22%
    
[libx264 @ 0x300d9c0] Weighted P-Frames: Y:10.1% UV:6.9%
    
[libx264 @ 0x300d9c0] ref P L0: 40.6% 12.1% 10.0%  5.2%  5.2%  4.7%  4.6%  3.0%  2.5%  2.1%  1.9%      1.8%  1.7%  1.7%  1.6%  1.3%
    
[libx264 @ 0x300d9c0] ref B L0: 71.4%  5.6%  3.2%  3.0%  3.1%  2.8%  2.5%  1.8%  1.3%  1.0%  1.1%      1.2%  1.0%  0.7%  0.5%
    
[libx264 @ 0x300d9c0] ref B L1: 96.3%  3.7%
    
[libx264 @ 0x300d9c0] kb/s:307.82

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