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• How to get the duration or total number of frame in ffmpeg filter ?

  1er juillet 2020, par Reasno

  I'm writing a filter in ffmpeg in which I have to get the duration of the video. The filter_frame function looks like followings :

  


  static int filter_frame(AVFilterLink* link, AVFrame* in) {
    AVFilterContext* avctx = link->dst;
    ExtractContext* privCtx = (ExtractContext*)avctx->priv;
    AVFilterLink* outlink = avctx->outputs[0];
    //here I want to get the duration or total number of frames:
}


  


  I have to get the duration or total number of frames in this function, but the only parameters of the function is AVFilterLink and AVFrame in which I cant find relative fields, so I dont know how to do.
Can you help me ? Thanks for your reply !

  


• avformat/ifv : Check that total frames do not overflow

  17 octobre 2020, par Michael Niedermayer

  avformat/ifv : Check that total frames do not overflow
  Fixes : Infinite loop
  
  Fixes : 26392/clusterfuzz-testcase-minimized-ffmpeg_dem_GIF_fuzzer-5713658237419520
  
  Fixes : 26435/clusterfuzz-testcase-minimized-ffmpeg_dem_SUBVIEWER_fuzzer-6548251853193216
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/ifv.c

• ffmpeg combine multiple images - output video incorrect xfade transition time, and total length

  24 janvier 2021, par jsaluja

  I want to merge 5 images with transition at specific times 4.00, 10.0, 16.0, 22.0, with a transition duration of 1 sec, and a 27 sec audio into a 27 sec video clip.

  


  I used the below command, and got output video of 10 min 43 sec

  


  ./ffmpeg \
-i 27.m4a \
-loop 1 -t 4.0 -i image01.jpeg \
-loop 1 -t 6.0 -i image02.jpeg \
-loop 1 -t 6.0 -i image03.jpeg \
-loop 1 -t 6.0 -i image04.jpeg \
-loop 1 -t 5.0 -i image05.jpeg \
-movflags faststart -pix_fmt yuva420p \
-filter_complex " \
[1:v] format=pix_fmts=yuva420p, \
scale=1080:1920:force_original_aspect_ratio=decrease, \
pad=1080:1920:(ow-iw)/2:(oh-ih)/2, \
zoompan=z='if(eq(on,1),1,zoom+0.0004170)':x='iw-iw/zoom':y='0':fps=60:d=60*4.000:s=1080x1920, \
crop=w=1080:h=1920:x='(iw-ow)/2':y='(ih-oh)/2', \
setpts=PTS-STARTPTS+0.000/TB[v0]; \
[2:v] format=pix_fmts=yuva420p, \
scale=1080:1920:force_original_aspect_ratio=decrease, \
pad=1080:1920:(ow-iw)/2:(oh-ih)/2, \
zoompan=z='if(eq(on,1),1,zoom+0.0004170)':x='0':y='ih-ih/zoom':fps=60:d=60*6.000:s=1080x1920, \
crop=w=1080:h=1920:x='(iw-ow)/2':y='(ih-oh)/2', \
setpts=PTS-STARTPTS+4.000/TB[v1]; \
[3:v] format=pix_fmts=yuva420p, \
scale=1080:1920:force_original_aspect_ratio=decrease, \
pad=1080:1920:(ow-iw)/2:(oh-ih)/2, \
zoompan=z='if(eq(on,1),1,zoom+0.0004170)':x='0':y='ih-ih/zoom':fps=60:d=60*6.000:s=1080x1920, \
crop=w=1080:h=1920:x='(iw-ow)/2':y='(ih-oh)/2', \
setpts=PTS-STARTPTS+10.000/TB[v2]; \
[4:v] format=pix_fmts=yuva420p, \
scale=1080:1920:force_original_aspect_ratio=decrease, \
pad=1080:1920:(ow-iw)/2:(oh-ih)/2, \
zoompan=z='if(eq(on,1),1,zoom+0.0004170)':x='iw-iw/zoom':y='0':fps=60:d=60*6.000:s=1080x1920, \
crop=w=1080:h=1920:x='(iw-ow)/2':y='(ih-oh)/2', \
setpts=PTS-STARTPTS+16.000/TB[v3]; \
[5:v] format=pix_fmts=yuva420p, \
scale=1080:1920:force_original_aspect_ratio=decrease, \
pad=1080:1920:(ow-iw)/2:(oh-ih)/2, \
zoompan=z='if(eq(on,1),1,zoom+0.0004170)':x='iw-iw/zoom':y='ih-ih/zoom':fps=60:d=60*5.000:s=1080x1920, \
crop=w=1080:h=1920:x='(iw-ow)/2':y='(ih-oh)/2', \
setpts=PTS-STARTPTS+22.000/TB[v4]; \
[v0][v1]xfade=transition=circlecrop:duration=1.00:offset=3.000[v01];\
[v01][v2]xfade=transition=hrslice:duration=1.00:offset=8.000[v12];\
[v12][v3]xfade=transition=slideleft:duration=1.00:offset=13.000[v23];\
[v23][v4]xfade=transition=vdslice:duration=1.00:offset=18.000[v34]" \
-map "0:a" -map [v34] -y output.mp4


  


  ====

  


  I think I need to tweak the time values are specified at 4 places to get this right

  


  -loop 1 -t TIMESTAMP1

  


  I set this to expected duration of each image i.e, 4, 6, 6, 6, 5

  


  zoompan=z='if(eq(on,1),1,zoom+0.0004170)':x='iw-iw/zoom':y='0':fps=60:d=60* TIMESTAMP2 :s=1080x1920,

  


  I set this to expected duration of each image i.e, 4, 6, 6, 6, 5

  


  setpts = PTS - STARTPTS+ TIMESTAMP3 /TB

  


  I set this to cumulative offset from 0 i.e, 0, 4, 10, 16, 22

  


  Additionally, I ensured that
TIMESTAMP2 + TIMESTAMP3 = time at which each image display should end ie., 4, 10, 16, 22, 27

  


  xfade=transition=circlecrop:duration=1.00:offset=TIMESTAMP4

  


  =======

  


  Few problems

  


  

  1. The transition between images, is not as per the times i expect

  


  2. Overall clip length is long 10:43 as opposed to expected 00:27

  


  3. Overall processing time is 5+ minutes

  


  


  Am i missing something ?