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• avutil/mem : remove av_realloc / av_malloc incompatibility warning

  21 avril 2015, par Michael Niedermayer

  avutil/mem : remove av_realloc / av_malloc incompatibility warning
  memalign() is not guranteed to be compatible with free() or realloc()
  
  and for platforms in this category we have —enable-memalign-hack
  
  (which should be enabled automatically if such system is detected)
  
  Trying to somehow half support systems that can free() memalign memory
  
  but not reallocate it seems not worth the amount of work needed to
  
  keep 2 then incompatible allocation systems and ensure their
  
  seperation. That is unless this would affect a major platform
  
  on which we want to avoid the memalign hack code
  The warnings also cause wasted time and effort as people try
  
  to maintain a separation that does not exist currently.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavutil/mem.h

• FFMPEG Batch Copy Metadata from "Folder1File1.mp3" to "Folder2File1.mp3" in different folders

  27 février 2020, par Vektorz

  I have two separate files in separate folders with the same name and I would like to transfer the metadata from the file in "folder1" to "folder2".
  Then I would like to add a whole bunch of files fitting this same format and batch transfer all of the metadata information.

  From a stack exchange thread I’ve tried :

  "The following script will loop through the the files in one directory, find corresponding files in a second directory and then combine these two files into a third output directory
  
  
  
  dir1=FIRST DIRECTORY
  
  dir2=SECOND DIRECTORY
  
  output=OUTPUT DIRECTORY
  
  for file in $(ls $dir1); do
  
    ffmpeg -i "$dir1/$file" -i "$dir2/$file" -map 1 -c copy \
  
     # copies all global metadata from in0.mkv to out.mkv  
  
     -map_metadata 0 \
  
     # copies video stream metadata from in0.mkv to out.mkv
  
     -map_metadata:s:v 0:s:v \
  
     # copies audio stream metadata from in0.mkv to out.mkv
  
     -map_metadata:s:a 0:s:a \
  
     "$outdir/$file"
  
  done"

  But for the life of me I cannot get this to work properly and it is a bit overkill. He continues on saying :

  If you want to make something reuseable you could put this in a script with the following header (remove the assignment for dir1, dir2 and output in the script above). And then call it as script.sh dir1 dir2 outdir
  
  
  
  #!/bin/bash
  
  set -x errexit # exit immediately on error
  
  dir1="$1"
  
  dir2="$2"
  
  output="$3"

  And I am totally lost. Can someone please help me to get this to work and walk me through it a bit easier as I’m fairly inexperienced with code/FFMPEG.

  Thank you.

• Why can’t VLC go in to fullscreen mode ?

  31 mai 2017, par matiastofteby

  I’m working on a Matlab application that uses a VLC class to control a VLC-instance. One of the features is to set the VLC player to fullscreen. This feature works perfectly fine.

  The VLC player is downloaded from Matlab’s File Exchange : https://se.mathworks.com/matlabcentral/fileexchange/56215-vlc (Thanks a lot Léa Strobino)

  However, one particular clip insists on resizing the player to a smaller size.
  I have done some research and it turns out that this is a common problem in some VLC versions.

  Normal workarounds are to uncheck the “adapt interface to video size” (something like that) and to check the “Fullscreen” box.
  This ought to make the player open in fullscreen and not resize the screen to video size. The video still resizes the player to a smaller size.

  All the specs of the clips are the same : Same file extension (.vob), formats and were made the same way (I did some video trimming and such using ffmpeg – but the same way every time).

  I have noticed one difference and that is that this particular video has a lower Data and bitrate ( 1000-1500kbps) where as the others are higher (<4000kbps). Also when showing the properties of the clip the frame height and width are blank as opposed to the others that have specific values.

  This should however not have an effect of the fullscreen command from Matlab called after loading the video into the playlist. The command has no effect on this video, but does on all other.

  It is possible to set the player to fullscreen manually by clicking the window, so it is not caused by some restriction in the video not allowing it to fullscreen.

  Why does the video refuse to go in to fullscreen ?

  Hope somebody is able to help.