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• 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 ?

• 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 

• .swf file gets cut short after conversion to mp3 with ffmpeg

  23 mai 2014, par galdikas

  So I have a .swf file which i need to convert to .mp3 (or any other audio file), it looks like this :

  vytautas@vytautas-SATELLITE-C660:~/Desktop$ ffmpeg -i rem.swf
  
  ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
  
    built on May 18 2014 02:20:25 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-x11grab --enable-libpulse --enable-libx264 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr
  
    libavutil      52. 84.100 / 52. 84.100
  
    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
  
    libavresample   1.  2.  0 /  1.  2.  0
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [swf @ 0x2762ae0] SWF compressed file detected
  
  [swf @ 0x2762ae0] Could not find codec parameters for stream 0 (Audio: pcm_u8, 5512 Hz, mono, 44 kb/s): unspecified sample format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, swf, from 'rem.swf':
  
    Duration: 00:00:00.55, bitrate: 98 kb/s
  
      Stream #0:0: Audio: pcm_u8, 5512 Hz, mono, 44 kb/s
  
      Stream #0:1: Audio: mp3, 22050 Hz, mono, s16p, 128 kb/s
  
  At least one output file must be specified

  So it’s length is : 00:00:00.55, but then I convert it to .mp3 using this command :

   ffmpeg -i rem.swf -map 0:1 -acodec copy rem.mp3

  and this is the output I get :

  **output ommited, as it is same as above**
  
  Input #0, swf, from 'rem.swf':
  
    Duration: 00:00:00.55, bitrate: 98 kb/s
  
      Stream #0:0: Audio: pcm_u8, 5512 Hz, mono, 44 kb/s
  
      Stream #0:1: Audio: mp3, 22050 Hz, mono, s16p, 128 kb/s
  
  File 'rem.mp3' already exists. Overwrite ? [y/N] y
  
  Output #0, mp3, to 'rem.mp3':
  
    Metadata:
  
      TSSE            : Lavf55.38.100
  
      Stream #0:0: Audio: mp3, 22050 Hz, mono, 128 kb/s
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  size=       5kB time=00:00:00.33 bitrate= 130.7kbits/s    
  
  video:0kB audio:5kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.080189%

  So now the length is only 00:00:00.33, any ideas ?

  Here is the link to the file, even if yous could try converting it on your own machine that would help as well :

  https://docs.google.com/file/d/0ByJlZbStPk2cS0FwN09TX2VkWjg/edit

  Thanks in advance !