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• Rails Streamio FFMPEG taking a screenshot of the movie and upload with carrierwave

  5 juin 2016, par Felix

  I have got a Form where I can upload a movie. Its uploaded with carrierwave.

  In this process I want to Make a screenshot of the movie while uploading.

  How can I do this with Streamio FFMPEG.

  My code Looks like this at the moment.

  #Laedt ein Video hoch
  
  def uploadMovie
  
    @channels = Channel.all
  
    @vid = Movie.new(movies_params)
  
  
  
    @channel = Channel.find(params[:channel_id])
  
    @vid.channel = @channel
  
  
  
    if @vid.save
  
      flash[:notice] = t("flash.saved")
  
      render :add
  
    else
  
      render :add
  
    end
  
  end

  Do I have to do this in controller method or in the carrierwave uplaoder ?

  Update : I tried it this way :

  if @vid.save
  
    flash[:notice] = t("flash.saved")
  
    movieFile = FFMPEG::Movie.new(@vid.video.to_s)
  
    screenshot = movieFile.screenshot("uploads/screenshot", :seek_time => 10)
  
    render :add
  
  else

  But then I got tis error :

  s3.amazonaws.com/uploads/movie/video/6/2016-04-24_16.26.10.mp4' does not exist

• avconv : from multiple png to movie not exporting correctly

  13 avril 2016, par abhra

  I am trying to generate a mp4 movie from a set of pngs using avconv on my debian8 system. The mp4 file its generating basically looping over the first figure for some time. Here is the command I am using

  avconv -r 10 -start_number 8 -i images_%06d.png -b:v 1000k -vf scale=640 :-1 test.mp4

  Output is

  avconv version 11.6-6:11.6-1 deb8u1, Copyright (c) 2000-2014 the Libav developers built on Mar 2 2016 23:00:02 with gcc 4.9.2
  (Debian 4.9.2-10) Input #0, image2, from ’images_%06d.png’ :
  Duration : 00:00:16.00, start : 0.000000, bitrate : N/A
  Stream #0.0 : Video : png, rgb24, 2400x1801, 25 fps, 25 tbn File ’test.mp4’ already exists. Overwrite ? [y/N] y [scale @ 0x820c60] The
  ::flags= option syntax is deprecated. Use either
  : : or w=:h=:flags=. [libx264 @ 0x837760]
  using cpu capabilities : MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT
  BMI2 [libx264 @ 0x837760] profile High, level 2.2 [libx264 @ 0x837760]
  264 - core 142 r2431 a5831aa - H.264/MPEG-4 AVC codec - Copyleft
  2003-2014 - http://www.videolan.org/x264.html - options : cabac=1 ref=3
  deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00
  mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0
  deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12
  lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0
  bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
  b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250
  keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr
  mbtree=1 bitrate=1000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4
  ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to ’test.mp4’ : Metadata :
  encoder : Lavf56.1.0
  Stream #0.0 : Video : libx264, yuv420p, 640x480, q=-1—1, 1000 kb/s, 10 fps, 10 tbn, 10 tbc
  Metadata :
  encoder : Lavc56.1.0 libx264 Stream mapping : Stream #0:0 -> #0:0 (png (native) -> h264 (libx264)) Press ctrl-c to stop encoding frame= 17 fps= 0 q=0.0 size= 0kB time=10000000000.00
  bitrate= 0.0kbitframe= 34 fps= 32 q=0.0 size= 0kB
  time=10000000000.00 bitrate= 0.0kbitframe= 51 fps= 32 q=0.0 size=
  0kB time=10000000000.00 bitrate= 0.0kbitframe= 393 fps= 32 q=0.0
  Lsize= 139kB time=39.00 bitrate= 29.2kbits/s video:132kB
  audio:0kB other streams:0kB global headers:0kB muxing overhead :
  5.284794% [libx264 @ 0x837760] frame I:2 Avg QP : 3.69 size : 51320 [libx264 @ 0x837760] frame P:99 Avg QP : 0.32 size : 242 [libx264
  @ 0x837760] frame B:292 Avg QP : 0.15 size : 26 [libx264 @
  0x837760] consecutive B-frames : 0.8% 0.5% 0.0% 98.7% [libx264 @
  0x837760] mb I I16..4 : 45.5% 19.2% 35.3% [libx264 @ 0x837760] mb P
  I16..4 : 0.0% 0.0% 0.0% P16..4 : 0.9% 0.0% 0.0% 0.0% 0.0%
  skip:99.0% [libx264 @ 0x837760] mb B I16..4 : 0.0% 0.0% 0.0%
  B16..8 : 0.2% 0.0% 0.0% direct : 0.0% skip:99.8% L0:22.3% L1:77.7%
  BI : 0.0% [libx264 @ 0x837760] final ratefactor : -21.09 [libx264 @
  0x837760] 8x8 transform intra:18.9% inter:41.7% [libx264 @ 0x837760]
  coded y,uvDC,uvAC intra : 34.1% 0.0% 0.0% inter : 0.1% 0.0% 0.0%
  [libx264 @ 0x837760] i16 v,h,dc,p : 81% 14% 5% 0% [libx264 @
  0x837760] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu : 49% 14% 36% 0% 0% 0% 0%
  0% 0% [libx264 @ 0x837760] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu : 36% 28% 19%
  3% 3% 2% 4% 2% 3% [libx264 @ 0x837760] i8c dc,h,v,p : 100% 0% 0%
  0% [libx264 @ 0x837760] Weighted P-Frames : Y:0.0% UV:0.0% [libx264 @
  0x837760] ref P L0 : 99.3% 0.0% 0.6% 0.1% [libx264 @ 0x837760] ref B
  L0 : 4.2% 95.8% [libx264 @ 0x837760] ref B L1 : 99.8% 0.2% [libx264 @
  0x837760] kb/s:27.34

  I have also tried

  cat *.png | avconv -f image2pipe -i - -b:v 1000k -vf scale=640 :-1 test2.mp4

  output shows

  avconv version 11.6-6:11.6-1 deb8u1, Copyright (c) 2000-2014 the Libav developers built on Mar 2 2016 23:00:02 with gcc 4.9.2
  (Debian 4.9.2-10) Codec AVOption b (set bitrate (in bits/s)) specified
  for output file #0 (test2.mp4) has not been used for any stream. The
  most likely reason is either wrong type (e.g. a video option with no
  video streams) or that it is a private option of some encoder which
  was not actually used for any stream. Output #0, image2pipe, to
  ’test2.mp4’ : Output file #0 does not contain any stream

  When getting frames fromtest.mp4

  avconv -i test.mp4 -r 30 -f image2 %04d.png

  I found 1000 or more copies of the images_000001.png.

  Would you please help, whether I have made any mistake in commands ? Or am I missing some codec options ? Thanks for the help.

• Ffmpeg generated movie (png -> mp4) has no video

  21 avril 2016, par ILiveForVR

  I have a whole bunch of png’s which I would like to convert into a mp4 video.
  I am using the following command to stich them together :
  ffmpeg -i _2016-04-20_14-51-00-500_%06d.png -pix_fmt yuv420p movie.mp4

  I am getting a file, which has a size so it isn’t empty. But when I play it in VLC or Quicktime it shows the time going by, but it has no video in it. Any idea what I’m doing wrong ?
  I also tried :

  ffmpeg -framerate 1/5 -i _2016-04-20_14-51-00-500_%06d.png -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4

  and

  ffmpeg -r 45 -f image2 -s 1920x1080 -i _2016-04-20_14-51-00-500_%06d.png -vcodec libx264 -crf 25  -pix_fmt yuv420p test.mp4

  But still no video.
  This is the commandline output :

  >ffmpeg -i _2016-04-20_14-51-00-500_%06d.png -pix_fmt yuv420p movie.mp4
  
  ffmpeg version N-79546-g13406b6 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 22.100 / 55. 22.100
  
    libavcodec     57. 35.100 / 57. 35.100
  
    libavformat    57. 34.102 / 57. 34.102
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 44.100 /  6. 44.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, image2, from '_2016-04-20_14-51-00-500_%06d.png':
  
    Duration: 00:00:02.60, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgba(pc), 8192x4096 [SAR 3779:3779 DAR 2:1], 25 tbr, 25 tbn
  
  [libx264 @ 00000000025851e0] using SAR=1/1
  
  [libx264 @ 00000000025851e0] frame MB size (512x256) > level limit (36864)
  
  [libx264 @ 00000000025851e0] DPB size (4 frames, 524288 mbs) > level limit (1 frames, 184320 mbs)
  
  [libx264 @ 00000000025851e0] MB rate (3276800) > level limit (2073600)
  
  [libx264 @ 00000000025851e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 00000000025851e0] profile High, level 5.2
  
  [libx264 @ 00000000025851e0] 264 - core 148 r2665 a01e339 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=18 lookahead_threads=3 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
  
  [mp4 @ 0000000002583fc0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Output #0, mp4, to 'movie.mp4':
  
    Metadata:
  
      encoder         : Lavf57.34.102
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 8192x4096 [SAR 1:1 DAR 2:1], q=2-31, 25 fps, 12800 tbn
  
      Metadata:
  
        encoder         : Lavc57.35.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=   65 fps=3.2 q=-1.0 Lsize=   13498kB time=00:00:02.48 bitrate=44585.2kbits/s speed=0.123x    6x
  
  video:13497kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.009971%
  
  [libx264 @ 00000000025851e0] frame I:1     Avg QP:16.71  size:1373751
  
  [libx264 @ 00000000025851e0] frame P:52    Avg QP:23.59  size:234822
  
  [libx264 @ 00000000025851e0] frame B:12    Avg QP:21.17  size: 19609
  
  [libx264 @ 00000000025851e0] consecutive B-frames: 73.8%  3.1%  4.6% 18.5%
  
  [libx264 @ 00000000025851e0] mb I  I16..4: 14.7% 73.8% 11.5%
  
  [libx264 @ 00000000025851e0] mb P  I16..4:  3.1%  5.9%  0.5%  P16..4: 23.2%  7.7%  2.0%  0.0%  0.0%    skip:57.5%
  
  [libx264 @ 00000000025851e0] mb B  I16..4:  0.1%  0.1%  0.0%  B16..8:  9.0%  0.2%  0.0%  direct: 0.2%  skip:90.3%  L0:33.0% L1:66.6% BI: 0.4%
  
  [libx264 @ 00000000025851e0] 8x8 transform intra:63.5% inter:78.5%
  
  [libx264 @ 00000000025851e0] coded y,uvDC,uvAC intra: 33.7% 3.1% 1.0% inter: 10.1% 0.4% 0.0%
  
  [libx264 @ 00000000025851e0] i16 v,h,dc,p: 24% 57%  3% 17%
  
  [libx264 @ 00000000025851e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 31% 38%  2%  3%  2%  5%  2%  4%
  
  [libx264 @ 00000000025851e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 63% 10%  2%  2%  1%  5%  1%  4%
  
  [libx264 @ 00000000025851e0] i8c dc,h,v,p: 94%  2%  3%  0%
  
  [libx264 @ 00000000025851e0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 00000000025851e0] ref P L0: 71.6% 13.1% 10.8%  4.4%
  
  [libx264 @ 00000000025851e0] ref B L0: 69.0% 30.6%  0.4%
  
  [libx264 @ 00000000025851e0] ref B L1: 89.7% 10.3%
  
  [libx264 @ 00000000025851e0] kb/s:42522.38