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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.

• Encoding of two full hd streams in Linux + GPU with Intel HD4000 / VA API / FFMPEG / OpenGL

  30 juin 2016, par qknight

  i want to encode/stream two full hd streams in realtime from my laptop to a remote location using linux/xorg on the host.

  VA API

  for this i’ve been playing with the VA API but the performance is pretty bad with 5.59 fps (see paste below).

  FFMPEG

  using ffmpeg with CPU encoding i get about 200 fps but then all cores of my Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz are busy and the fan turns on.

  future plans

  i want GPU support in encoding and later integrate this into a program which streams a virtual xorg ’screen’, see https://lastlog.de/wiki/index.php/Raspberry_PI_virtual_screen for more details on my plans.

  maybe h264 isn’t even what i want ? so if someone advices towards a different implementation, i’d welcome that.

  besides VA API there seems to be QuickSync but i didn’t experiment with that yet as it is not packaged on NixOS just yet.

  note : i need a library to have a smooth integration into the code.

  h264encode -w 1920 -h 1080 —profile MPSource frame is 1920x1080 and will code clip to 1920x1088 with crop
  INPUT:Try to encode H264...
  
  INPUT : Resolution : 1920x1080, 60 frames
  
  INPUT : FrameRate : 30
  
  INPUT : Bitrate : 14929920
  
  INPUT : Slieces : 1
  
  INPUT : IntraPeriod : 30
  
  INPUT : IDRPeriod : 60
  
  INPUT : IpPeriod : 1
  
  INPUT : Initial QP : 26
  
  INPUT : Min QP : 0
  
  INPUT : Source YUV : AUTO generated
  
  INPUT : Coded Clip : /tmp/test.264
  
  INPUT : Rec   Clip : Not save reconstructed frame
  libva info : VA-API version 0.38.1
  
  libva info : va_getDriverName() returns 0
  
  libva info : Trying to open /run/opengl-driver/lib/dri/i965_drv_video.so
  
  libva info : Found init function __vaDriverInit_0_38
  
  libva info : va_openDriver() returns 0
  
  Use profile VAProfileH264Main
  
  Support rate control mode (0x12):CBR CQP 
  
  RateControl mode : CQP
  
  Support VAConfigAttribEncPackedHeaders
  
  Support packed sequence headers
  
  Support packed picture headers
  
  Support packed slice headers
  
  Support packed misc headers
  
  Support 1 RefPicList0 and 1 RefPicList1
  
  Loading data into surface 15.....Complete surface loading
  
        \00000059(054456 bytes coded)
  PERFORMANCE :   Frame Rate : 5.59 fps (60 frames, 10730 ms (178.83 ms per frame))
  
  PERFORMANCE :   Compression ratio : 51:1
  
  PERFORMANCE :     UploadPicture : 10467 ms (174.45, 97.55% percent)
  
  PERFORMANCE :     vaBeginPicture : 0 ms (0.00, 0.00% percent)
  
  PERFORMANCE :     vaRenderHeader : 1 ms (0.02, 0.01% percent)
  
  PERFORMANCE :     vaEndPicture : 42 ms (0.70, 0.39% percent)
  
  PERFORMANCE :     vaSyncSurface : 244 ms (4.07, 2.27% percent)
  
  PERFORMANCE :     SavePicture : 7 ms (0.12, 0.07% percent)
  
  PERFORMANCE :     Others : -31 ms (71582787.75, 40027653.91% percent)
  
  (Multithread enabled, the timing is only for reference)
  

  i’ve seen https://www.reddit.com/r/linux/comments/1qk1yu/is_there_currently_opensource_software_to_encode/ though but i’m not sure what do do with it.