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• Join a series of mp4 files using ffmpeg following a pattern in filenames

  26 juin 2015, par Slabo

  I’m trying to join a series of generated mp4 files with the filenames in the following order>>

  Vid1.mp4,Vid1s.mp4,Smiley.mp4,Vid2.mp4,Vid2s.mp4,Smiley.mp4, ..... VidN.mp4,VidNs.mp4,Smiley.mp4

  where the pattern is A1,A1s,C,A2,A2s,C .... AN,ANs,C ... where N is the half the number of files in the folder.. File names are actually in a format similar to AN.mp4 and ANs.mp4

  I know it’s going to be something like : :

  ffmpeg -f concat -i some regex -c copy FinalVid.mp4

  I used to know this stuff 10 years ago... ok, 9 years ago..

  Edit : Ok, so after trying to fix this myself, I can better describe the problem as follows

  if two files Vid-N.mp4 and Vid-Ns.mp4 exist, then should be appended to FinalVid.mp4. How do I solve this ? Just thinking out loud: :

  1. get list of mp4 files
  2. for every two pairs of files, append to
     FinalVid.mp4

  Any help appreciated, thanks.

• How to encode a series of .dpx files using X264

  4 juin 2015, par user3759710

  I am complete newbie to video encoding. I am trying to encode a series of .dpx files into one single encoded video O/P file in any of the following format. ( .mp4,.avi,.h264,.mkv etc)

  I have tried 2 different approaches. The first one works and the second one does not.
  I would like to know the difference between the two. Any help / input would be much appreciated.

  1) using FFMPEG along with x264 library and it works well. I am able to produce desired output

  ffmpeg -start_number 0 -i frame%4d.dpx -pix_fmt yuv420p -c:v libx264 -crf 28 
  
  -profile:v baseline fromdpx.h264

  2) I first try to concatenate all the dpx files into a single file using concate protocol in ffmpeg and then use x264 to encode the concatenated file.
  Here I see that the size of the concatenated file is the sum of all the files concatenated. But when I use x264 command to encode the concatenated file, I get a green screen (basically not the desired output) .

  ffmpeg -i "concat:frame0.dpx|frame01.dpx|frame2.dpx etc" -c copy output.dpx

  then

  x264 --crf 28 --profile baseline -o encoded.mp4 --input-res 1920x1080 --demuxer raw 
  
  output.dpx

  I also tried to encoded the concatenated file using ffmpeg as follows

  ffmpeg -i output.dpx -pix_fmt yuv420p -c:v libx264 -crf 28 -profile:v baseline fromdpx.h264

  This also gives me a blank video.

  Could someone please point out to me what is going on here ? Why does the first method work and the second does not ?

  Thank you.

• ffmpeg convert a series of images to video - with crossfade or any other transition between every two frames

  12 mai 2017, par Mr Narendra

  I am currently able to convert a series of images to video, but I do also need to add transitions / animation in between them.

  String[] ffmpegCommand = {"/data/data/mypackage/app_bin/ffmpeg", "-y",
  
  "-qscale", "1", "-r", "" + framerate, "-i", "/data/data/mypackage/app_ipImg/image%3d.jpg",
  
  "-t", "" + (((total_images) * delay_of_each_frame_in_seconds) + 4), //"-s",heightwidth,
  
  "-vcodec", "libx264", "-s", "640x480",
  
   Environment.getExternalStorageDirectory() + "/photo_directory/myVideo.mp4"};

  The above command is working for me to create video from image series

  But

  Now, I do want to add fade or other transition / animation to be displayed in final video before each of the frames.

  I googled a lot, but didn’t find any solution to this trouble, yet.

  Please suggest me the way.

  Thanks in advance.