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• FFMPEG crop boundaries animation

  28 septembre 2021, par VlFedotov

  I'm looking for a way to make crop filter params depends on current time.

  


  Now I have 2 videos - white and aqua squares in one split output video, and this code works fine :

  


  ffmpeg -i out/i1.mp4 -i out/i2.mp4 -filter_complex "[0:v]crop=iw/2:ih:0:0[left];[1:v]crop=iw/2:ih:ow:0[right];[left][right]hstack" out/generated.mp4


  


  My question is - how to make the border between two videos floating, animated ? For example from left side of output vide to the right ?

  


  I already tried to use t param, e.g. like this :

  


  ffmpeg -i out/i1.mp4 -i out/i2.mp4 -filter_complex "[0:v]crop=iw/2+t:ih:0:0[left];[1:v]crop=iw/2-t:ih:ow:0[right];[left][right]hstack" out/generated.mp4


  


  But it throws an error :

  


  [Parsed_crop_0 @ 0x7fa46060eec0] Error when evaluating the expression 'iw/2+t'

[Parsed_crop_0 @ 0x7fa46060eec0] Failed to configure input pad on Parsed_crop_0

Error reinitializing filters!

Failed to inject frame into filter network: Invalid argument

Error while processing the decoded data for stream #1:0


  


  Can anybody help me to solve this ? Or explain - why it isn't possible ?

  


• avformat/mov : fix integer overflow

  10 octobre 2015, par Ganesh Ajjanagadde

  avformat/mov : fix integer overflow
  Partially fixes Ticket 4727.
   duration is not a safe expression, since duration can be INT_MIN.
  
  One might ask how it can become INT_MIN.
  
  Although it is true that line 2574 is no longer reached with INT_MIN due
  
  to commit 053e80f6eaf8d87521fe58ea96886b6ee0bbe59d (which fixed another
  
  integer overflow issue), mov_update_dts_shift is called on line 3549 as
  
  well, right after a read of untrusted data.
  
  One can do the fix locally there, but that function is already a huge
  
  mess. Changing mov_update_dts_shift is likely better.
  This changes duration to INT_MIN + 1 in such cases. This should not make any
  
  practical difference since such streams are anyway fuzzer files.
  Tested with FATE.
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  

  • [DH] libavformat/mov.c

• android ffmpeg synchronize thread

  28 juin 2018, par Junburg

  I’m currently working on cutting and pasting audio with ffmpeg on Android. The problem is that when one audio file is not finished, there are other working files that need to be executed. I think the error below means this. I work through threads. An expression that executes a thread whenever there is a file to be processed.

  W/System.err: com.github.hiteshsondhi88.libffmpeg.exceptions.FFmpegCommandAlreadyRunningException: FFmpeg command is already running, you are only allowed to run single command at a time
  
  W/System.err:     at com.github.hiteshsondhi88.libffmpeg.FFmpeg.execute(FFmpeg.java:63)
  
                at com.github.hiteshsondhi88.libffmpeg.FFmpeg.execute(FFmpeg.java:89)
  
                at com.softcode.tablet.Mp3Concat_Thread$2.run(Mp3Concat_Thread.java:614)
  
                at java.lang.Thread.run(Thread.java:762)

  So what I want to ask is how to synchronize if a file comes in when the thread’s work is not over yet. Since the ffmpeg object is created with a singleton pattern, it seems that you will not be able to create a new object for each operation.

  If you know the answer, I would appreciate your reply.