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• Remove frames based off an image with FFmpeg

  15 novembre 2020, par VEXED

  The Goal : Take a frame or a reference image and use that to decide what frames to keep/remove from an old screen recording (no audio).

  


  To be slightly more specific, I want to match a specific program that is being used in the screen recording. The program is always full screen and could potentially be identified just by a crop of the top left corner.

  


  The Question : What would be the best way to take an image, in particular a cropped corner of say 100px width and height, and look for the same matching corner in a video ? I would want to output those matches to a new file, that or remove the non-matching frames and create a new file with all the frames that match.

  


  What I Know : I know that duplicate frame removal is very possible, and I already use that for screen recordings.

  


  -filter:v mpdecimate, setpts=N/FRAME_RATE/TB \


  


  The above is being used in my screen recording script to remove duplicate frames.

  


  I'm also aware that you can crop using FFmpeg, but I'm not looking to have actual cropped output. I'm only looking to use a crop to find the portion that matches my reference image or reference frame.

  


  ffmpeg -i in.mp4 -filter:v "crop=out_w:out_h:x:y" out.mp4


  


  The above is a basic crop.

  


  The only reference to finding frames by images is this one. It didn't do what I wanted and just produced dark and distorted output. Though I might be understanding what the aim of that post was incorrectly.

  


  Notes : Thanks in advance for any help, this frame/image matching doesn't have to be done while recording, but can be done in post.

  


• trying to merge 2 video command [duplicate]

  4 octobre 2019, par Vikram Dulgach

  This question already has an answer here :

  • FFmpeg - concat videos error, do not match the corresponding output link ?
    
    1 answer
    

  I am trying to merge 2 video one has audio and in 2nd video i am adding silent track. but everytime i am trying to merge them it shows me these error. I am using 2 command in both ti give me same erro.

  String [] merge2video={ "-i", video1,"-i", new video2,"-filter_complex", "[0:v]scale=1280x720,setpts=PTS-STARTPTS[v0];[1:v]scale=1280x720,setpts=PTS-STARTPTS[v1];[v0][0:a][v1][1:a]concat=n=2:v=1:a=1", "-map", "[v]", "-map", "[a]","-preset" ,"ultrafast" ,"-crf" ,"30", sharevideo};

  String [] merge2video= "-i", video1,"-i", new video2,"-filter_complex", "[0]setdar=16/9[a] ;[1]setdar=16/9[b] ; [a][b]concat=n=2:v=1:a=1", "-map", "[v]", "-map", "[a]","-preset" ,"ultrafast" ,"-crf" ,"30", sharevideo ;

  [swscaler @ 0xee692000] deprecated pixel format used, make sure you did set range correctly
  [Parsed_concat_4 @ 0xee9255f0] Input link in1:v0 parameters (size 1280x720, SAR 1647:1648) do not match the corresponding output link in0:v0 parameters (1280x720, SAR 1:1)
  [Parsed_concat_4 @ 0xee9255f0] Failed to configure output pad on Parsed_concat_4
  Error configuring complex filters.
  Invalid argument

  Help to solve there issue if anybody is there thanks in advance. and sorry for bad english

• How can I manually extract Metadata from mp4 Videoframes ?

  3 décembre 2020, par bennimueller

  I have a large GoPro Video about 11:44 min. Each second the GoPro records 30 frames with datetime(UNIX) and gps(lat, long) information. So there are round about 21188 frames in my video.

  


  I need to extract the GPS data to bring every single frame to a map. There's a tool called GoProtelemetryextractor (https://goprotelemetryextractor.com/free/). This gives me a csv file with 19800 lines (1 line for each frame). Obviously there are 1400 rows/frames missing in the csv. If I now multiplex the csv with the mp4 in a GIS software, the frames get assigned to wrong "csv frames". I need to match these 19800 frames correctly to the frames in the video by deleting "None metadata frames" out of the video.
I guess the problem is that the goprotelemetry extractor starts writing the csv with the first metadata it finds. And not starting at the first frame and just write "NO METADATA ROWS".

  


  Basically my question is : How can I extract the metadata from each mp4 Frame "manually" to know where the csv "starts" and match video and csv ?