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• .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 !

• AVI to MP4 - ffmpeg conversion

  4 juin 2014, par Emmanuel Brunet

  I’m running a debian 7.5 machine with ffmpeg-2.2 installed following these instructions

  Issue

  I’m trying to display a mp4 video inside my browser. The original file has an AVI container format. I can successfully convert it to mp4 and the targetfile is readable (video + sound) with the totem movie player. So I thought everything would be OK displaying the bellow page

  HTML5 web page

      
  
  
  
  
  
  <video width="640" height="480" controls="controls">
  
    <source src="/path/to/output.mp4" type="video/mp4">
  
  <h3>Your browser does not support the video tag</h3>
  
  </source></video>

  Input probe

  $ ffprobe -show_streams input.avi
  
  
  
    Duration: 00:08:22.90, start: 0.000000, bitrate: 1943 kb/s
  
      Stream #0:0: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 64 kb/s
  
      Stream #0:1: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x540 [SAR 1:1 DAR 4:3], 1870 kb/s, 29.97 fps, 25 tbr, 29.97 tbn, 25 tbc

  Convert

  $ ffmpeg -y -fflags +genpts -i input.avi -acodec copy -vcodec copy ouput.mp4

  Html browser

  Opening the above html file plays sound but no video is displayed.

  When I use other .mp4 files, videos succesfully displayed so I’m sure I face a conversion issue.

  Not : I’ve tryed a lot of other ffmpeg options but without success.

  Any idea ?

  Thanks in advance.

• RGB to YUV422 conversion with ffmpeg, incorrect colors

  22 janvier 2016, par user3578571

  I’m trying to convert an 8bit RGB uncompressed to an mpeg2 mxf file (xdcam 422 HD 1080 50i) which is YUV422. With info from the FFMpeg docs and various websites i made the following command :

  ./ffmpeg -y -i test_lines.mov  -pix_fmt yuv422p -vcodec mpeg2video -non_linear_quant 1 -flags +ildct+ilme -top 1 -dc 10 -intra_vlc 1 -qmax 2 -vtag xd5c -rc_max_vbv_use 1 -rc_min_vbv_use 1 -g 12 -b:v 50000k -minrate 50000k -maxrate 50000k -bufsize 8000k -acodec pcm_s24le -ar 48000 -bf 2 -ac 2 lines_HD.mxf

  This gave me a result with the colors much brighter than the original.

  So i tried adding the options -color_range 1 -colorspace 1 -color_primaries 1 -color_trc 1 but this didn’t seem to do anything.

  After adding colormatrix=bt601:bt709 i got a way better image, but slightly darker than the original and it also feels weird specifying this option cause the source is also in the REC709 colorspace, so why specify it differently ?

  Next i regenerated my source image to an YUV codec (prores) and rerun FFMpeg on it with the colors coming out just fine. Therefore i think it has to be an RGB -> YUV problem.
  Does somebody have an idea how to this properly ? I can provide screenshots of the different results on a videoscope as soon as i’m back at the office, if anybody is interested.

  Last, i know there are various topics touching this subject but either they go way over my head FFmpeg wise or bring me to the stage where i already am.