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• Returning ffprobe metadata to another function using fluent-ffmpeg

  28 avril 2021, par noquierouser

  I'm trying to use fluent-ffmpeg's ffprobe to get the metadata of a file and add it to a list, but I want to separate the process of getting the metadata from the method related to checking the file, mostly because the addFileToList() function is quite long as is and the ffprobe routine is quite long as well.

  


  I've tried the following code, but it doesn't give the results I'm expecting :

  


  export default {
  // ...
  methods: {
    getVideoMetadata (file) {
      const ffmpeg = require('fluent-ffmpeg')
      ffmpeg.ffprobe(file.name, (err, metadata) => {
        if (!err) {
          console.log(metadata)  // this shows the metadata just fine
          return metadata
        }
      })
    },
    addFileToList (file) {
      // file checking routines
      console.log(this.getVideoMetadata(file))  // this returns null
      item.metadata = this.getVideoMetadata(file)
      // item saving routines
    }    
  }
}


  


  I've already tried to nest the getVideoMetadata() routines inside addFileToList(), and it works, but not as intended, because the actions are carried, but not the first time, only the second time. It seems to be an async issue, but I don't know how can I tackle this.

  


  What can I do ? Should I stick to my idea of decoupling getVideoMetadata() or should I nest it inside addFileToList() and wrestle with async/await ?

  


• avformat/apngdec : Fix size/overflow checks

  12 janvier 2020, par Andreas Rheinhardt

  avformat/apngdec : Fix size/overflow checks
  apng data consists of parts containing a small header (including a
  
  four-byte size field) and a data part ; the size field does not account
  
  for everything and is actually twelve bytes short of the actual size. In
  
  order to make sure that the size fits into an int, the size field is
  
  checked for being > INT_MAX ; yet this does not account for the + 12 and
  
  upon conversion to int (which happens when calling append_extradata()),
  
  the size parameter can still wrap around. In this case the currently
  
  used check would lead to undefined signed integer overflow.
  Furthermore, append_extradata() appends the new data to the already
  
  existing extradata and therefore needs to make sure that the combined
  
  size of new and old data as well as padding fits into an int. The check
  
  used for this is "if (old_size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE -
  
  new_size)". If new_size is > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE
  
  the right side becomes negative if the types are signed (as they are
  
  now) ; yet changing this to "if (new_size > INT_MAX -
  
  AV_INPUT_BUFFER_PADDING_SIZE - old_size)" is better as this also works
  
  for unsigned types (where it is of course presumed that INT_MAX is
  
  replaced by the corresponding maximum for the new type).
  Both of these issues have been fixed.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/apngdec.c

• JavaCV FrameRecorder broken output

  24 juin 2016, par user6510675

  I am trying to record from my webcam 360 frames, however the generated movie file always gets broken.

  Example from my dropbox account : https://www.dropbox.com/s/wc4p21tyuhu7uls/Untitled.avi?dl=0

  The issue starts at minute 0:02.

  I don’t know how to fix this.

  I always receive this message in the console :
  using huffyuv 2.2.0 or newer interlacing flag