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• Generate a thumbnail image every X seconds

  1er août 2013, par rabotalius

  I'm trying to generate a thumbnail every minute, but i'm getting the following error :

  ffmpeg -i Hung.mp4 -f image2 -vf fps=fps=1/60 img%03d.jpg
  
  
  
  [mjpeg @ 0x2f06da0] bitrate tolerance too small for bitrate
  
  [mjpeg @ 0x2f1b7c0] ff_frame_thread_encoder_init failed
  
  Output #0, image2, to 'img%03d.jpg':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: mp41
  
      Stream #0:0(eng): Video: mjpeg, yuvj420p, 1280x536 [SAR 1:1 DAR 160:67], q=2-31, 200 kb/s, 90k tbn, 0.02 tbc
  
      Metadata:
  
        creation_time   : 2013-07-22 00:01:41
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> mjpeg)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

• Paperclip-ffmpeg not working on Rails

  28 juillet 2013, par Lee7355512727

  I installed Paperclip-ffmpeg and tried to upload a flv file, but it seems there are some problems converting the file.

  I added Paperclip.options[:command_path] = "/usr/bin/" (I got the path by using which ffmpeg) to my config/environments/development.rb file, following the instructions on the paperclip-ffmpeg github page.

  Here is my model subquestion.rb, which contains a paperclip field called qflv :

  class Subquestion < ActiveRecord::Base
  
      belongs_to :question
  
      has_many :qimages , :dependent =>  :destroy
  
  
  
      has_attached_file :qflv, styles: {
  
          medium: {geometry: "640*480", format: 'flv'},
  
          thumb: {geometry: "100*100#", format: 'jpg', time: 10}
  
      }, processors: [:ffmpeg]

  And here is my _subquestion_fields.html.erb file, where users upload videos :

  <%= f.file_field :qflv %>

  _subquestion_fields.html.erb is rendered by question.html.erb file :

  <%= nested_form_for @question, :url => {:action => 'create_question'} do |f| %>
  
         <%= f.fields_for :subquestions do |builder| %>
  
         <%= render 'subquestion_fields', :f => builder %>

  And here is part of the error message :

  WARNING: gnome-keyring:: couldn't connect to: /run/user/li/keyring-CsW4u8/pkcs11: No such file or directory
  
  ffmpeg version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
  
    built on Mar 30 2013 22:23:21 with gcc 4.7.2
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  [flv @ 0x8ba50a0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from '/tmp/03000201005171FC8274A20623ECA86B119768-56C7-7A62-DB7A-A4B599F64EE720130727-1837-13757l9.flv':
  
    Metadata:
  
      metadatacreator : modified by youku.com in 20111202
  
      hasKeyframes    : true
  
      hasVideo        : true
  
      hasAudio        : true
  
      hasMetadata     : true
  
    Duration: 00:05:25.03, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: h264 (High), yuv420p, 448x336 [PAR 1:1 DAR 4:3], 15 tbr, 1k tbn, 30 tbc
  
      Stream #0.1: Audio: aac, 44100 Hz, stereo, s16
  
  Incorrect frame size
  
  Failed to set value '0x0' for option 's'
  
  WARNING: gnome-keyring:: couldn't connect to: /run/user/li/keyring-CsW4u8/pkcs11: No such file or directory
  
  ffmpeg version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
  
    built on Mar 30 2013 22:23:21 with gcc 4.7.2
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  [flv @ 0x86490a0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from '/tmp/03000201005171FC8274A20623ECA86B119768-56C7-7A62-DB7A-A4B599F64EE720130727-1837-13757l9.flv':
  
    Metadata:
  
      metadatacreator : modified by youku.com in 20111202
  
      hasKeyframes    : true
  
      hasVideo        : true
  
      hasAudio        : true
  
      hasMetadata     : true
  
    Duration: 00:05:25.03, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: h264 (High), yuv420p, 448x336 [PAR 1:1 DAR 4:3], 15 tbr, 1k tbn, 30 tbc
  
      Stream #0.1: Audio: aac, 44100 Hz, stereo, s16
  
  Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting format 'yuvj420p'
  
  [buffer @ 0x864c180] w:448 h:336 pixfmt:yuv420p
  
  [scale @ 0x8653840] w:448 h:336 fmt:yuv420p -> w:448 h:336 fmt:yuvj420p flags:0x4
  
  [crop @ 0x864dc20] w:448 h:336 -> w:0 h:0
  
  [crop @ 0x864dc20] Invalid too big or non positive size for width '0' or height '0'
  
  Error opening filters!
  
  
  
  
  
  Started POST "/test_geisinger/roots/questions/create" for 127.0.0.1 at 2013-07-27 23:12:31 -0400
  
  Processing by RootsController#create_question as HTML
  
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"EiJk5dBf1nL96BtUiKc0qALCg0Bj9mQ0dx9IodfYdO0=", "question"=>{"explanation"=>"flv", "choice_id"=>"8", "correct_selection_id"=>"32", "quiz_id"=>"10", "subquestions_attributes"=>{"0"=>{"subquestion_type"=>"flv", "_destroy"=>"false", "qflv"=>#x-flv\r\n", @tempfile=#tmp/RackMultipart20130727-1837-1f6g2s0>>}}}, "commit"=>"Submit"}
  
  [paperclip] [ffmpeg] ffmpeg -i "/tmp/03000201005171FC8274A20623ECA86B119768-56C7-7A62-DB7A-A4B599F64EE720130727-1837-13757l9.flv" 2>&1
  
  [paperclip] [ffmpeg] Command Success
  
  [paperclip] [ffmpeg] Making...
  
  [paperclip] [ffmpeg] Building Destination File: '03000201005171FC8274A20623ECA86B119768-56C7-7A62-DB7A-A4B599F64EE720130727-1837-13757l9' + 'flv'
  
  [paperclip] [ffmpeg] Destination File Built
  
  [paperclip] [ffmpeg] Adding Geometry
  
  [paperclip] [ffmpeg] Extracting Target Dimensions
  
  [paperclip] [ffmpeg] Target Size is Available
  
  [paperclip] [ffmpeg] Keeping Aspect Ratio
  
  [paperclip] [ffmpeg] Resize
  
  [paperclip] [ffmpeg] Convert Options: 0x0
  
  [paperclip] [ffmpeg] Adding Format
  
  [paperclip] [ffmpeg] Adding Source
  
  [paperclip] [ffmpeg] Building Parameters
  
  [paperclip] [ffmpeg] -i :source -s 0x0 -y :dest
  
  Command :: ffmpeg -i '/tmp/03000201005171FC8274A20623ECA86B119768-56C7-7A62-DB7A-A4B599F64EE720130727-1837-13757l9.flv' -s 0x0 -y '/tmp/03000201005171FC8274A20623ECA86B119768-56C7-7A62-DB7A-A4B599F64EE720130727-1837-13757l920130727-1837-11o3enh.flv'
  
  [paperclip] An error was received while processing: #tmp/03000201005171FC8274A20623ECA86B119768-56C7-7A62-DB7A-A4B599F64EE720130727-1837-13757l9.flv' -s 0x0 -y '/tmp/03000201005171FC8274A20623ECA86B119768-56C7-7A62-DB7A-A4B599F64EE720130727-1837-13757l920130727-1837-11o3enh.flv'' returned 1. Expected 0

  There might be some problems with pkcs11 so I found this article :

  https://bugzilla.redhat.com/show_bug.cgi?id=783568

  But I could not find /etc/xdg/autostart/gnome-keyring-*.desktop.

  Thank you !

• flvEncoder .flv output won't convert to .mp4 with ffmpeg

  31 juillet 2013, par Emma Assin

  My current project involves creating a .flv using AIR (using https://github.com/zeropointnine/leelib/tree/master/src/leelib/util/flvEncoder) - which then has to be converted into an .mp4, for which we are using ffmpeg.

  The .mp4 output is the correct dimensions and duration, but blank (no images). Audio is not an issue as the original output has no audio.

  ffmpeg version N-55020-g768e40b Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 28 2013 18:05:44 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --e
  
  nable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable
  
  -libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enab
  
  le-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheo
  
  ra --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --en
  
  able-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 40.100 / 52. 40.100
  
    libavcodec     55. 19.100 / 55. 19.100
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 81.103 /  3. 81.103
  
    libswscale      2.  4.100 /  2.  4.100
  
    libswresample   0. 17.103 /  0. 17.103
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, flv, from 'testWithAudio.flv':
  
    Metadata:
  
      canSeekToEnd    : true
  
      metadatacreator : FlvEncoder v0.9 Lee Felarca
  
    Duration: 00:00:44.77, start: 0.000000, bitrate: 56730 kb/s
  
      Stream #0:0: Video: flashsv, bgr24, 400x400, 30 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
  
  No pixel format specified, yuv444p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 00000000002e1da0] using cpu capabilities: MMX2 SSE2Fast SSEMisalign LZCNT
  
  [libx264 @ 00000000002e1da0] profile High 4:4:4 Predictive, level 2.1, 4:4:4 8-bit
  
  [libx264 @ 00000000002e1da0] 264 - core 135 r2345 f0c1c53 - 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=4 threads=1 lookahead_threads=1 sl
  
  iced_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 dire
  
  ct=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 'testWithAudio.mp4':
  
    Metadata:
  
      canSeekToEnd    : true
  
      metadatacreator : FlvEncoder v0.9 Lee Felarca
  
      encoder         : Lavf55.12.102
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 400x400, q=-1--1, 15360 tbn, 30 tbc
  
      Stream #0:1: Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flashsv -> libx264)
  
    Stream #0:1 -> #0:1 (pcm_s16le -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  frame= 1343 fps= 25 q=29.0 Lsize=    2680kB time=00:00:44.70 bitrate= 491.2kbits/s
  
  video:1943kB audio:691kB subtitle:0 global headers:0kB muxing overhead 1.756713%
  
  [libx264 @ 00000000002e1da0] frame I:25    Avg QP:20.44  size: 14523
  
  [libx264 @ 00000000002e1da0] frame P:614   Avg QP:23.20  size:  2319
  
  [libx264 @ 00000000002e1da0] frame B:704   Avg QP:24.59  size:   287
  
  [libx264 @ 00000000002e1da0] consecutive B-frames: 25.6% 11.0%  7.4% 56.0%
  
  [libx264 @ 00000000002e1da0] mb I  I16..4: 17.6% 67.0% 15.3%
  
  [libx264 @ 00000000002e1da0] mb P  I16..4:  7.6%  9.9%  0.8%  P16..4: 28.0%  8.3%  4.0%  0.0%  0.0%    skip:41.4%
  
  [libx264 @ 00000000002e1da0] mb B  I16..4:  0.4%  0.5%  0.0%  B16..8: 16.3%  1.1%  0.1%  direct: 0.2%  skip:81.4%  L0:39.7% L
  
  1:57.4% BI: 2.8%
  
  [libx264 @ 00000000002e1da0] 8x8 transform intra:56.3% inter:85.5%
  
  [libx264 @ 00000000002e1da0] coded y,u,v intra: 35.7% 17.0% 19.1% inter: 7.7% 3.8% 3.4%
  
  [libx264 @ 00000000002e1da0] i16 v,h,dc,p: 26% 28% 17% 30%
  
  [libx264 @ 00000000002e1da0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 21% 33%  4%  4%  5%  4%  4%  4%
  
  [libx264 @ 00000000002e1da0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 21% 16%  5%  6%  9%  6%  6%  6%
  
  [libx264 @ 00000000002e1da0] Weighted P-Frames: Y:6.5% UV:3.3%
  
  [libx264 @ 00000000002e1da0] ref P L0: 56.8% 16.5% 18.2%  8.0%  0.6%
  
  [libx264 @ 00000000002e1da0] ref B L0: 82.3% 14.1%  3.7%
  
  [libx264 @ 00000000002e1da0] ref B L1: 93.7%  6.3%
  
  [libx264 @ 00000000002e1da0] kb/s:355.47

  Any ideas ?