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• Is there any library in python or can we use FFMPEG to detect the appearance of the lines pattern in video that is shown in the image attached below ? [closed]

  21 septembre 2022, par Shreyas R

  Video defect appearing frame

  


  Hi All,

  


  I am trying to find a way to detect the appearance of this lines pattern embedded in the link below.
If I get any match of this pattern in a video, I need to record that particular timestamp of the video where I got the pattern match.

  


  My idea is to take the image and compare it against the video to find for approximate match percentage. If I get it, then I record that particular timestamp within a .txt file.

  


  Is there any better way to achieve this ?
I think we can use Python or FFMPEG video filters to get a solution for this.

  


  It would really help if anyone can support with a solution. Thanks

  


  Update :
I got a reference where they have proposed a solution similar to my concern.

  


  https://aws.amazon.com/blogs/media/metfc-automatically-compare-two-videos-to-find-common-content/

  


  So we can try to achieve some output from this solution.

  


• FFMPeg Windows C# H264

  21 septembre 2011, par Allen Ho

  I am trying to use SharpFFMpeg

  http://sourceforge.net/projects/sharpffmpeg/

  I found avcodec-52.dll and avformat-52.dll somewhere on the Net...

  When I use SharpFFMpeg and make calls like av_init_packet

  I get PInvoke errors like so

  PInvokeStackImbalance was detected
  Message : A call to PInvoke function 'WpfApplicationFFMpegTest !FFmpegSharp.Interop.FFmpeg::av_init_packet' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.

  In a nutshell I am trying to decode H264 and display the incoming stream from a camera...

  Just wondering if anyone has been able to do this succesfully in C# ?

  Thanks

• Multiple video input to Video grid using vstack and hstack in ffmpeg

  22 mars 2017, par Newbee7

  I am trying to find a working example for ffmpeg to combine 4 videos (2x2 stack) and 9 videos (3x3 stack) that are not the same resolution.

  For the 2x2 example I am currently I am using the documentation example but it only works if all videos are the same resolution. see command

  ffmpeg -i top_l.mp4 -i top_r.mp4 -i bottom_l.mp4 -i bottom_r.mp4 -i audio.mp4 \
-filter_complex "[0:v][1:v]hstack[t];[2:v][3:v]hstack[b];[t][b]vstack[v]" \
-map "[v]" -an -sn -shortest -f flv rtmp://server/stream

  This does not work with my videos inputs with the following error.

  [Parsed_vstack_2 @ 0000000003245cc0] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 0000000003245cc0] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while decoding stream #3:0: Invalid argument
[Parsed_vstack_2 @ 00000000033fec20] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033fec20] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Error while filtering: Invalid argument
[Parsed_vstack_2 @ 00000000033feb40] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033feb40] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while decoding stream #0:0: Invalid argument
[Parsed_vstack_2 @ 00000000033fec20] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033fec20] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while decoding stream #1:0: Invalid argument
[Parsed_vstack_2 @ 00000000033fece0] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033fece0] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while decoding stream #2:0: Invalid argument
[Parsed_vstack_2 @ 00000000033ff1c0] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033ff1c0] Failed to configure output pad on Parsed_vstack_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while decoding stream #3:0: Invalid argument
Finishing stream 0:0 without any data written to it.
[Parsed_vstack_2 @ 00000000033fec20] Input 1 width 1440 does not match input 0 width 1264.
[Parsed_vstack_2 @ 00000000033fec20] Failed to configure output pad on Parsed_vstack_2
Error configuring filter graph
Conversion failed!

  Also if anyone knows how to do the 3x3 stack, feel free to comment.