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• Popen.write - operation on closed file | images to video using FFmpeg

  10 juin 2014, par f.rodrigues

  I’m trying to create a video file from images from my webcam(using SimpleCV), the images are converted to PIL format and then tostring() [rawformat]

  I’m using python subprocess and Popen to create the video using the FFmpeg.

  I can pipe the one image to the FFmpeg and make a video out of it
  But when I try to do a bunch of them I get a error :

  ValueError: I/O operation on closed file

  here’s my code.

  import subprocess as sp
  
  from SimpleCV import *
  
  from Image import Image
  
  
  
  FFMPEG_BIN = "ffmpeg.exe"
  
  
  
  img = Camera().getImage().toRGB()
  
  
  
  
  
  command = [FFMPEG_BIN, '-y',  # (optional) overwrite output file if it exists
  
             '-f', 'rawvideo', '-vcodec', 'rawvideo', '-s', '%sx%s'%(img.width,img.height),  # size of one frame
  
             '-pix_fmt', 'rgb24', '-r', '24',  # frames per second
  
             '-i', '-',  # The imput comes from a pipe
  
             '-an',  # Tells FFMPEG not to expect any audio
  
             '-vcodec', 'libx264rgb',
  
             'my_output_videofile.mp4']
  
  
  
  
  
  pipe = sp.Popen(command, stdin=sp.PIPE)#, stderr=sp.PIPE)
  
  
  
  
  
  for n in xrange(10):
  
      img = Camera().getImage().toRGB().getPIL().tostring()
  
      pipe.stdin.write(img)
  
  
  
  
  
  pipe.terminate()

  It’s wierd because the pipe.terminate() is in the end of the code, and it should close the file right away.

  EDIT :
  Removed the stderr

    ffmpeg version N-63208-gbe1fbc0 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on May 17 2014 01:30:26 with gcc 4.8.2 (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-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug 
  
    --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus 
  
    --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame 
  
    --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx 
  
    --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid 
  
    --enable-decklink --enable-zlib
  
    libavutil      52. 83.100 / 52. 83.100
  
    libavcodec     55. 62.100 / 55. 62.100
  
    libavformat    55. 38.100 / 55. 38.100
  
    libavdevice    55. 13.101 / 55. 13.101
  
    libavfilter     4.  5.100 /  4.  5.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, rawvideo, from 'pipe:':
  
    Duration: N/A, start: 0.000000, bitrate: 44236 kb/s
  
      Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240, 44236 kb/s, 24 tbr, 24 tbn, 24 tbc
  
  No pixel format specified, rgb24 for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264rgb @ 0000000000359de0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264rgb @ 0000000000359de0] profile High 4:4:4 Predictive, level 1.3, 4:4:4 8-bit
  
  [libx264rgb @ 0000000000359de0] 264 - core 142 r2431 ac76440 - 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=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=24 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 'my_output_videofile.mp4':
  
    Metadata:
  
      encoder         : Lavf55.38.100
  
      Stream #0:0: Video: h264 (libx264rgb) ([33][0][0][0] / 0x0021), rgb24, 320x240, q=-1--1, 12288 tbn, 24 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> libx264rgb)
  
  frame=    7 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A 

• Keep quality after drawtext in ffmpeg

  24 mai 2014, par NickName

  I am trying to use ffmpeg to put a subtitle in an avi video. I use this command to do it :

  -i input.avi -vf drawtext="fontsize=80:fontfile=C\\:/Windows/Fonts/arial.ttf:text=TEST_TEXT:y=h-line_h:x=(h+400)-(t*110)" output.avi

  The output of ffmpeg console is :

  >ffmpeg -i testwithout.avi -vf drawtext="fontsize=
  
  80:fontfile=C\\:/Windows/Fonts/arial.ttf:text=HELLO:y=h-line_h:x=(h+400)-(t*110)
  
  " -an withsubtitle.avi
  
  ffmpeg version N-62121-g634636e Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr  3 2014 23:30:16 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
  
  cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
  
  ack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable
  
  -zlib
  
    libavutil      52. 73.100 / 52. 73.100
  
    libavcodec     55. 56.107 / 55. 56.107
  
    libavformat    55. 36.101 / 55. 36.101
  
    libavdevice    55. 11.100 / 55. 11.100
  
    libavfilter     4.  3.100 /  4.  3.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [avi @ 041307e0] non-interleaved AVI
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, avi, from 'C:\\Users\\╬Χ╧Β╬│╬▒╧Δ╬ψ╬╡╧Γ\\Desktop\\testwithout.avi':
  
    Duration: 00:00:07.67, start: 0.000000, bitrate: 147822 kb/s
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 146812 k
  
  b/s, 30 tbr, 30 tbn, 30 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16
  
  , 1411 kb/s
  
  File 'withsubtitle.avi' already exists. Overwrite ? [y/N] y
  
  Output #0, avi, to 'withsubtitle.avi':
  
    Metadata:
  
      ISFT            : Lavf55.36.101
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 640x480, q=2-31, 200
  
   kb/s, 30 tbn, 30 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> mpeg4)
  
  Press [q] to stop, [?] for help
  
  frame=  112 fps=0.0 q=20.0 size=     331kB time=00:00:03.93 bitrate= 689.8kbits/
  
  frame=  222 fps=220 q=31.0 size=     479kB time=00:00:07.60 bitrate= 516.8kbits/
  
  frame=  228 fps=210 q=28.7 Lsize=     485kB time=00:00:07.80 bitrate= 509.4kbits
  
  /s
  
  video:474kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing o
  
  verhead: 2.350742%

  But my input video is 135 MB and the output is only 613 KB. How i could keep the same quality of video ?

• Ffmpeg - Remove rotate metadata

  16 mai 2014, par Ron I

  When I extract the images from a video, the resulting images are getting rotated. The orientation of the video is correct, and the images are upside down. The metadata for the original video is 180, and also for the output file, so it looks like it is copying that data and additionally rotating 180 degrees. However, since the original video is already rotated, it is flipping the video upside down.

  I would like to remove the metadata for the output file containing the ’rotate’ command. I tried adding -vf rotate=0, but it didn’t work.

  Here is the command I am running :

  ffmpeg -i left.MOV -r 1 -f image2 left-03%d.png

  I assume this is what is throwing it off (it looks like it is copying the rotate metadata from the input file and applying it to the output file) :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'left.MOV':
  
  rotate          : 180
  
  
  
  Output #0, image2, to 'left-03%d.png':
  
  
  
  Metadata:
  
        rotate          : 180

  Here’s the full output :

      ffmpeg version 2.2.1 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr 11 2014 22:50:35 with Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 66.100 / 52. 66.100
  
    libavcodec     55. 52.102 / 55. 52.102
  
    libavformat    55. 33.100 / 55. 33.100
  
    libavdevice    55. 10.100 / 55. 10.100
  
    libavfilter     4.  2.100 /  4.  2.100
  
    libavresample   1.  2.  0 /  1.  2.  0
  
    libswscale      2.  5.102 /  2.  5.102
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'left.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2014-05-14 16:24:27
  
      make            : Apple
  
      make-eng        : Apple
  
      encoder         : 7.1.1
  
      encoder-eng     : 7.1.1
  
      date            : 2014-05-14T09:23:48-0700
  
      date-eng        : 2014-05-14T09:23:48-0700
  
      model           : iPhone 5
  
      model-eng       : iPhone 5
  
    Duration: 00:00:10.98, start: 0.000000, bitrate: 795 kb/s
  
      Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 62 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-05-14 16:24:27
  
        handler_name    : Core Media Data Handler
  
      Stream #0:1(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 568x320, 728 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        rotate          : 180
  
        creation_time   : 2014-05-14 16:24:27
  
        handler_name    : Core Media Data Handler
  
  Output #0, image2, to 'left-03%d.png':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      model-eng       : iPhone 5
  
      make            : Apple
  
      make-eng        : Apple
  
      model           : iPhone 5
  
      encoder-eng     : 7.1.1
  
      date            : 2014-05-14T09:23:48-0700
  
      date-eng        : 2014-05-14T09:23:48-0700
  
      encoder         : Lavf55.33.100
  
      Stream #0:0(und): Video: png, rgb24, 568x320, q=2-31, 200 kb/s, 90k tbn, 1 tbc (default)
  
      Metadata:
  
        rotate          : 180
  
        creation_time   : 2014-05-14 16:24:27
  
        handler_name    : Core Media Data Handler
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (h264 -> png)
  
  Press [q] to stop, [?] for help
  
  frame=   14 fps=0.0 q=0.0 Lsize=N/A time=00:00:14.00 bitrate=N/A dup=0 drop=315    
  
  video:1521kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead -100.001411%