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• python ff-mpeg not working on VM

  2 août 2013, par Bob

  I have two Windows 2008 R2 64 bit servers with two different host providers (GoDaddy and company B). My python script runs successfully on GoDaddy's server. It doesn't run successfully on the server with company B.

  I installed the same software on both servers :

  • Python 2.7 for Windows 32 bit
  • NumPY module
  • SetupTools
  • EchoNest API for Windows

  The company B server is giving me an error related to an executable called en-ffmpeg.exe that uses the python ff-mpeg module. The exact error message is

  [dv @ 0x1449690]Can't determine profile of DV input stream.
  C :\Music\song1.mp3 : Error while opening file

  The song.mp3 file exists. I installed the latest Windows updates on the server with Company B but still I get the error. I believe the error is because something is not configured properly on this server (missing libraries or drivers ?). However, I don't know what that is !

  Please help :)

  UPDATED TO INCLUDE COMMAND AND ERROR OUTPUT FROM FFMPEG

  COMMAND :

  c :\Python27>en-ffmpeg -i "C :\Music\song1.mp3" -y -ac 2 -ar 44100
  "c :\users\x07 dmini 1\x07ppdata\local\temp\x02\tmpax82jf.wav"

  FULL ERROR :

  FFmpeg version SVN-r17988-Komeil, Copyright (c) 2000-2009 Fabrice Bellard, et al
  
  .
  
    configuration: --enable-memalign-hack --extra-cflags=-fno-common --enable-stat
  
  ic --disable-shared --disable-debug --enable-gpl --enable-nonfree --enable-avfil
  
  ter --enable-avfilter-lavf --enable-avisynth --enable-postproc --enable-pthreads
  
   --enable-libamr-nb --enable-libamr-wb --enable-libgsm --enable-libfaac --enable
  
  -libfaad --enable-libmp3lame --enable-libschroedinger --enable-libspeex --enable
  
  -libtheora --enable-libvorbis --enable-libx264 --enable-libxvid
  
    libavutil     50. 0. 0 / 50. 0. 0
  
    libavcodec    52.21. 0 / 52.21. 0
  
    libavformat   52.31. 1 / 52.31. 1
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Mar 15 2009 18:16:31, gcc: 4.3.0 20080305 (alpha-testing) mingw-20080
  
  502
  
  [dv @ 0x1449690]Can't determine profile of DV input stream.
  
  C:\\Music\\song1.mp3: Error while opening file

  I also tried removing the double back slashes from the command but got the same error.

• Changing video frame rate and keeping duration intact

  6 mai 2018, par Idan

  I am trying to segment a video file, transcode each of the segments and then stitch them all back to one. The process is working but I have noticed that the final file has a different duration than the original one. Probably because I am transcoding to a fixed frame rate which is different from the source frame rate.

  To segment the video I use :

  ffmpeg -y -i video_only.mp4 -c copy -flags -global_header -segment_time 50 -break_non_keyframes 0 -reset_timestamps 0 \
  
    -segment_list file_segs.list -segment_format mp4 -segment_list_type ffconcat -write_empty_segments 0 \
  
    -f segment file_seg-%d.mp4

  Then, each segment is transcoded with this command :

  ffmpeg -y -i $f -vcodec libx264 -vsync 1 -crf 18 -vf "fps=30" -pix_fmt yuv420p -preset:v fast -profile:v main -level:v 4.1 transcoded/$f

  And finally, concat :

  ffmpeg -y -f concat -i file_segs.list -c:v copy -c:a copy -movflags +faststart video_final.mp4

  I’ve tried using "-r 30" instead on the filter (-vf), the same result.
  As this is a part of a transcoding system I prefer not to check for the input file fps before transcoding as it can be anything - variable fps too (which is not so easy to detect)

  Is there any way I can keep the duration intact while changing the frame rate in this type of transcoding flow ?

• ffmpeg : Incompatible pixel format 'yuv420p' for codec 'png', auto-selecting format 'rgb24'

  9 août 2019, par astromonerd

  I have a bunch of .png files

  file_000.png
  
  file_005.png
  
  file_010.png

  I am using an inherited ffmpeg script to stitch together .png files into an .mp4 file. I don’t understand all the flags, but I’ve used this script successfully in the past

  ## images_to_movie.sh
  
  set -o noglob
  
  
  
  in_files=$1
  
  out_file=$2
  
  
  
  ffmpeg \
  
      -framerate 10 \
  
      -loglevel warning \
  
      -pattern_type glob -i $in_files \
  
      -pix_fmt yuv420p \
  
      -vf 'crop=trunc(iw/2)*2:trunc(ih/2)*2:0:0' \
  
      -y \
  
      $out_file

  with the command

  ./images_to_movie file_*.png files.mp4

  I am now receiving the error

  Incompatible pixel format ’yuv420p’ for codec ’png’, auto-selecting
  format ’rgb24’

  Some searching reveals that

  -pix_fmt yuv420p

  is deprecated and I should instead use

  -pix_fmt yuv420p -color_range 2

  but the error remains. I tried using

  -pix_fmt rgb24

  and the error disappears but I’m no .mp4 file is created.

  How do I need to modify this script to create an .mp4 ?