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• FFmpeg - Vertical-Scroll Image Overlay for same duration as audio file

  28 décembre 2020, par John Doe

  I want to scroll an image vertically, but I want the animation duration to match an mp3 file, which will be different every time. Here's what I have :

  


  ffmpeg -y -hide_banner -f lavfi -i color=s=1280x720 -loop 1 -i "image.jpg" -filter_complex "[1:v]scale=1280:-2,setpts=if(eq(N\,0)\,0\,1+1/0.01/TB),fps=30[fg]; [0:v][fg]overlay=y=-'t*h*0.01':eof_action=endall[video]" -map "[video]" "output.mp4"


  


  But this always produces a video with duration of 1 minute and 40 seconds, making the animation slow down or speed up accordingly. This is not what I want. I want the output video (and the scrolling animation) duration to match a random mp3 file.

  


  I am using FFmpeg in a Batch file on Windows. Any help would be appreciated.

  


• 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.

• 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