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• How to convert ffmpeg command to ffmpeg-python

  1er décembre 2020, par Retro Pie

  Hello and thanks for reading.

  


  I have the following command : ffmpeg -i tmp.mp4 -loop 1 -i mask.png -filter_complex "[0:v]split [a][b];[a]transpose=1,crop=720:888:0:196,scale=876:1080,setdar=876/1080 [crop];[b]transpose=1,crop=720:888:0:196,scale=1920:1080,setdar=16/9,avgblur=76 [back];[1:v]alphaextract [mask];[crop][mask]alphamerge [masked];[back][masked]overlay=522:0" "out.mp4

  


  And I would like to convert it to ffmpeg-python syntax. So far I was able to come up with the bellow, but it far from ready :

  


  overlay_file = ffmpeg.input(mask)
(
ffmpeg
.input(tmp).split()
.overlay(overlay_file.hflip())
.alphaextract(),
.alphamerge(),
.output('out.mp4')
.run()
)


  


  Any help will be appreciated.

  


• FFMPEG- filtered video coming rotated

  31 août 2017, par Alok Kumar Verma

  After a lot of struggle I finally did what I want, i.e., save filters using ffmpeg now for now I’m using the Vintage filter command line from FFMPEG in order to add Vintage Filter to it. But there is a certain problem, and the problem is that The output is coming 90 degree clockwise rotated which is not what I wanted.

  I’ve used this command from FFMPEG documentation, and the vintage filter application is working fine.

  String complexCommand[] = {"-y", "-i", stringBuilder.toString(), "-strict", "experimental", "-vf", "curves=vintage",
  
              "-s", "640x480", "-r", "30", "-aspect", "4:3", "-ab",
  
              "48000","-ac", "2", "-ar", "22050", "-b:a", "2097k", "-vcodec", "mpeg4", savingPath};

  I’ve read about how to do the rotation from this link : Video Rotation using FFMPEG

  Now what I’ve tried is rotating the video 90 degree counterclockwise which transpose=2 after -vf from the documentation.

  1.This is what I’ve done :

  String complexCommand[] = {"-y", "-i", stringBuilder.toString(), "-strict", "experimental", "-vf", "transpose=2", "curves=vintage",
  
              "-s", "640x480", "-r", "30", "-aspect", "4:3", "-ab",
  
              "48000","-ac", "2", "-ar", "22050", "-b:a", "2097k", "-vcodec", "mpeg4", savingPath};

  But I got this problem in my logcat, i.e.,

  [NULL @ 0xaaab0c00] Unable to find a suitable output format for 'curves=vintage' curves=vintage: Invalid argument

  2. I’ve also done this in order to get the desired result :

  String complexCommand[] = {"-y", "-i", stringBuilder.toString(), "-strict", "experimental", "-vf", "transpose=2",
  
          "-s", "640x480", "-r", "30", "-aspect", "4:3", "-ab",
  
          "48000","-ac", "2", "-ar", "22050", "-b:a", "2097k", "-vcodec", "mpeg4", savingPath};

  Now from above the result is fine, without any filter.

  3. I’ve tried this also which was my last attempt to do that :

  String complexCommand[] = {"-y", "-i", stringBuilder.toString(), "-strict", "experimental", "-vf", "curves=vintage", "-vf", "transpose=2",
  
          "-s", "640x480", "-r", "30", "-aspect", "4:3", "-ab",
  
          "48000","-ac", "2", "-ar", "22050", "-b:a", "2097k", "-vcodec", "mpeg4", savingPath};

  Here is what I have changed : "-vf", "curves=vintage", "-vf","transpose=2"

  But the result was same as in the second, only the rotated video, no fiters applied to the video.

  I’m in need of the result as I’ve reached close to my destination but the problem is there and I need the result as the filtered video with the rotated form and that has to be implemented in the string only.

  I think there is some issue with the string before -vf as the video is getting rotated before -vf and when I apply transpose then the correct result comes. Any suggestion would be appreciated.

  EDITS

  I’ve tried using this too, the && in between the command in order to get the result but I’m getting this error in my logcat :

  E/MediaMetadataRetrieverJNI: getFrameAtTime: videoFrame is a NULL pointer

  What I’ve done is :

  String complexCommand[] = {"-y", "-i", stringBuilder.toString(), "-strict", "experimental", "-vf", "curves=vintage",
  
              "&&", "-vf", "transpose=2", "-s", "720x720", "-r", "30", "-aspect", "4:3", "-ab",
  
              "48000","-ac", "2", "-ar", "22050", "-b:v", "2097k", "-vcodec", "mpeg4", savingPath};

• avformat/segafilmenc : Add deinit function

  14 janvier 2020, par Andreas Rheinhardt

  avformat/segafilmenc : Add deinit function
  Prevents memleaks when the trailer is never written or when shifting the
  
  data fails when writing the trailer.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/segafilmenc.c