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• avformat/crypto : add seeking support on read

  30 août 2016, par Simon Hailes

  avformat/crypto : add seeking support on read
  cyrpto allows reading of data which has been aes-128-cbc encrypted given a key and an iv. But it did not handle filetypes which require seeking... e.g. it failed on an encrypted .mp4 file.
  example :
  
  take 25.mp4 created with :
  
  ffmpeg -f lavfi -i sine=frequency=1000:beep_factor=2:r=48000:duration=720.0 -f lavfi -i testsrc=duration=720.0:rate=25 -vcodec libx264 -cmp 22 -timecode 10:00:00:00 -r 25 -y out\25.mp4
  encrypt with :
  
  openssl enc -aes-128-cbc -K 12345678901234567890123456789012 -iv 12345678901234567890123456789012 -in 25.mp4 -out 25.enc
  
  then to transcode in ffmpeg :
  
  ffmpeg -key 12345678901234567890123456789012 -iv 12345678901234567890123456789012 -i crypto:25.enc -vcodec mpeg4 -r 25 -y 25dec.mp4
  prior to this modification, the transcode would fail.
  Note also :  crypto previously maked both reads and writes as streamed, which caused the whole file
  
  to be read before the transcode started.  Now, for read only, if the underlying layer is not marked as streamed,
  
  then crypto is not.  This should enable efficient reading of encrypted containers which require seeking.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/crypto.c

• mp4 generated by moviepy no sound with tweepy

  2 décembre 2020, par Will Rowe

  I'm using MoviePy to edit a mp4 file and then Tweepy to tweet out the video.

  


  Here's what I have currently :

  


  clip = VideoFileClip("c:/users/.../UNIQUENAME2.mp4").subclip(8) #cut off the first 8 seconds of the clip
clip.write_videofile("c:/users/.../UNIQUENAME2-finished.mp4")
clip.close()
highlightz = TweetMachine()
highlightz.makeAVidTweet('c:/users/.../UNIQUENAME2-finished.mp4','audio test')


  


  Here's my TweetMachine :

  


  def makeAVidTweet(self,fileLoc,text):
        upload_result = self.api.media_upload(fileLoc)
        time.sleep(120) #wait just in case things are still processing
        media_ids = [upload_result.media_id_string]
        self.api.update_status(status=text, media_ids=media_ids)


  


  Currently, the video is cut fine and UNIQUENAME2-finished.mp4 is constructed correctly such that if I open the file on my computer, the video is cut correctly and the sound works. However, the video posted on Twitter has no sound.

  


  I'm assuming it's some sort of issue with how MoviePy makes the mp4 file and Twitter not liking something with the sound settings, but I'm pretty unfamiliar with mp4 stuff and I couldn't find anything about it on the MoviePy or Tweepy docs.

  


  Any tips or thoughts would be greatly appreciated !

  


  Stream info from VLC :
Codec : MPEG Audio layer 1/2 (mpga),
Type : Audio,
Channels : Stereo,
Sample Rate : 44100 Hz,
Bits per sample : 32,
Bitrate : 128 kb/s

  


• arm : Check for the .arch directive in configure

  3 mai 2017, par Martin Storsjö

  arm : Check for the .arch directive in configure
  When targeting windows, the .arch directive isn’t available.
  So far, when building for windows, we’ve always used gas-preprocessor,
  
  both when using msvc’s armasm and when using clang. Lately, clang/llvm
  
  has implemented the last missing piece (altmacro support) for building
  
  our assembly without gas-preprocessor. This means that we now build
  
  for arm/windows with clang without any extra compatibility layer.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] configure
  • [DBH] libavutil/arm/asm.S