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• Error "EVP_DecryptFinal_ex:bad decrypt:crypto\evp\evp_enc.c:570" appears even after specifying -md5 sha256 in command line

  29 septembre 2019, par shantanu goel

  I have the following query. Could anyone please suggest me a solution.

  I’m working on decryption of .ts file for the first time. I have downloaded multiple .ts files from the source and have merged them but not able to decrypt the file. Even if it gets decrypted the size of the file is zero bytes.

  Command I’m using :

  aes-128-cbc -d -in D:\Test\joined_files.ts -out D:\Test\decrypt_I00100000.ts -iv 0 -K 313863756468736b63646b6a616b -md SHA256

  The error I’m getting :

  the hex string is too short, padding with zero bytes to the length
  the hex string is too short, padding with zero bytes to the length
  bad decrypt
  1132:error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt:crypto\evp\evp_enc.c:570 :
  error in aes-128-cbc

  enter image description here

• `sage -pip install —user ffmpeg` did not make the "`OSError : Error : ffmpeg does not appear to be installed.`" message go away

  2 septembre 2019, par SomeoneElse

  I am running a Docker instance of Cocalc on a Ubuntu 16 server. Everything seems to be working but I am trying to debug why sage -pip install --user ffmpeg did not make the "OSError: Error: ffmpeg does not appear to be installed." message go away, even though it said it had been installed. Here is the full message.

  Error in lines 9-9
  
  Traceback (most recent call last):
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 1188, in execute
  
      flags=compile_flags) in namespace, locals
  
    File "", line 1, in <module>
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2944, in show
  
      s = show0(objs, combine_all=True)
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2903, in show0
  
      b = show0(a)
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2868, in show0
  
      show_animation(obj, **kwds)
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2642, in show_animation
  
      obj.ffmpeg(t, delay=delay, **kwds)
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/sage/plot/animate.py", line 885, in ffmpeg
  
      raise OSError(msg)
  
  OSError: Error: ffmpeg does not appear to be installed. Saving an animation to
  
  a movie file in any format other than GIF requires this software, so
  
  please install it and try again.
  
  </module>

  For reference, here is the code that gives the error :

  n = var("n")
  
  frames = []
  
  xr = (x, 0, 1)
  
  for k in srange(1, 50):
  
      g = plot((sum((-1)^(n-1)*sin(n*x)/n,n,1,k)), xr, color="blue", legend_label='k = %d' % k)
  
      g += plot(x/2, xr, color="green", legend_label="x/2")
  
      frames.append(g)
  
  
  
  a = animate(frames, ymin=0.0, ymax=1.0, legend_loc=(0.2,0.8))
  
  a.show()

• lavf/utils : fix error like "offset 0x1f85 : partial file"

  7 août 2019, par tomajsjiang

  lavf/utils : fix error like "offset 0x1f85 : partial file"
  fix error like "offset 0x1f85 : partial file", the root cause is when
  
  read the mp4 file from http, and the moov in the end of the mp4 file,
  
  reconfig the buffer will drop some data.
  Signed-off-by : Jun Zhao <barryjzhao@tencent.com>
  
  Signed-off-by : Zhongxing Jiang <tomajsjiang@tencent.com>
  

  • [DH] libavformat/utils.c