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• frei0r : handle string params

  29 août 2018, par Raphael Graf

  frei0r : handle string params
  This is needed for some of the frei0r filters (facebl0r and facedetect) which accept string parameters.
  Fixes the issue described here :
  
  http://www.ffmpeg-archive.org/Unable-to-set-ffmpeg-frei0r-facedetect-filter-parameter-td4680190.html
  Signed-off-by : Raphael Graf <r@undefined.ch>
  

  • [DH] libavfilter/vf_frei0r.c

• Clojure shell/sh does not handle single-quoted arguments correctly ?

  3 janvier 2020, par Jarzka

  Executing the following command in the REPL :

  (shell/sh "ls" "-lah" "'resources'")

  gives the following output :

  {:exit 2, :out "", :err "ls: cannot access 'resources': No such file or directory\n"}

  Executing the same command in the Bash shell gives the correct output, the list of files in the resources directory. To my understanding this means that shell/sh is unable to handle single-quoted arguments correctly. Is this true or am I doing something wrong ?

  The example above is a simple example, as usually I probably would not need to single-quote the folder name. But why this is a real problem is because I try to concat audio files by executing the following ffmpeg command using shell/sh ;

  ffmpeg -i resources/ffmpeg_working/1.flac
  
  -i resources/ffmpeg_working/2.flac
  
  -i resources/ffmpeg_working/3.flac
  
  -i resources/ffmpeg_working/4.flac
  
  -filter_complex '[0:0][1:0][2:0][3:0]concat=n=4:v=0:a=1[out]'
  
  -map '[out]'
  
  resources/ffmpeg_working/done.flac

  This gives the following output

  Stream map ''[out]'' matches no streams.

  Once again, if I execute the same ffmpeg command in the Bash shell it concatenates the files successfully. Thus, it seems that the single-quoted argument is not handle correctly ?

• ffmpy capture and handle stderr properly

  18 février 2019, par BLang

  I am very new to ffmpeg and am using pythons wrapper for ffmpeg, ffmpy to process a large number of videos, but some videos produce various warnings and can not be transcoded. For example :

  Unsupported codec with id 0 for input stream 4

  I read how to parse the video meta data into json from the tuple the ff.run() gives back (from the first ff[0]), but how would i gracefully handle errors from ff[1] is there any standard, or recommended way using the ffmpy wrapper ? Below is what i currently have, but wonder if there is a more graceful way of handling specific errors ?

  import ffmpy
  
  ff = ffmpy.FFprobe(
  
              inputs={file_to_probe: None},
  
              global_options=[
  
                  '-v', 'warning',
  
                  '-print_format', 'json',
  
                  '-show_format', '-show_streams',
  
              ]
  
              ).run(stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  
  
  
  # to load meta data works great!!
  
  video_meta_data = json.loads(ff[0].decode('utf-8'))
  
  
  
  # ideally i'd like to do something like: but is there a better way?!
  
  if ff[1] is not null:
  
      print('handle errors here')