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• Evolution #4080 : Raccourci puce : se débarasser de l’image

  1er octobre 2018, par cedric -

  kent1 propose
  https://unicode-table.com/fr/203A/
  avec sa variante pour le rtl
  https://unicode-table.com/fr/2039/

  Qui a le mérite de l’élégance (bon ça c’est subjectif mais ça me semble mieux que le triangle plein) et d’un large support (puisque guillemet simple)
  La puce étant injectée en CSS (le html sera un tiret comme actuellement - simple ? demi/quart/entier cadratin ?) ça n’est sémantiquement pas gênant

• Generate thumbnail of videos sent from frontend flask

  15 août 2021, par qqxlafk

  I want to generate a thumbnail(say, extract frame at 1s) for videos user uploaded and sent back from the frontend.
user_upload = request.files['file']
What is the proper way for doing that ? Is it possible to extract the frame without saving the file locally and read in first ?

  


  subprocess.call(['ffmpeg', '-i', user_upload, '-ss',
                     '00:00:00.000', '-vframes', '1', output_dir])


  


  or

  


       vidcap = cv2.VideoCapture(user_upload)
     success, image = vidcap.read()
     count = 0
     while success and count < 1:
         cv2.imwrite("frame%d.jpg" % count, image)     # save frame as JPEG file
         success, image = vidcap.read()
         print('Read a new frame: ', success)
         count += 1


  


  both FFmpeg and cv2 require to read in a Path, not a FileStorage.

  


    File "/Users/glwang/bikan/yc2020/eb-flask/siyu/utils.py", line 8, in capture_thumnail
    '00:00:00.000', '-vframes', '1', output_dir])
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 267, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 709, in __init__
    restore_signals, start_new_session)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 1275, in _execute_child
    restore_signals, start_new_session, preexec_fn)
TypeError: expected str, bytes or os.PathLike object, not FileStorage


  


  Also, when I tried to first save the file locally and use FFmpegfor extracting the frame,
user_upload.save('path/to/somewhere')
it shows

  


  File "/siyu/utils.py", line 7, in capture_thumnail
    video_input.save(video_input.filename)
  File "/Users/lib/python3.6/site-packages/werkzeug/datastructures.py", line 3070, in save
    copyfileobj(self.stream, dst, buffer_size)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/shutil.py", line 79, in copyfileobj
    buf = fsrc.read(length)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/tempfile.py", line 738, in read
    return self._file.read(*args)
ValueError: read of closed file


  


• fftools/graph/graphprint : Fix races when initializing graphprint

  30 mai, par Andreas Rheinhardt

  fftools/graph/graphprint : Fix races when initializing graphprint
  Setting print_graphs_format (in case no -print_graphs_format
  
  option was specified) is racy, as is using av_strtok()
  
  to split it. Both have been removed.
  Notice that using av_strtok() was destructive : In the absence
  
  of races the options would only have been applied for the
  
  first initialization.
  Reviewed-by : softworkz . <softworkz-at-hotmail.com@ffmpeg.org>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] fftools/graph/graphprint.c
  • [DH] fftools/textformat/avtextformat.c