Recherche avancée

Sur d’autres sites (10626)

• 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 ?

  


• How to convert a single photo into video with some filters ?

  11 avril 2019, par Zedd W

  I have a picture in jpeg format : cat.

  I converted this picture into a video through some ffmpeg filter : scale and zoompan. The video is that the picture is slowly enlarged

  Then, I encountered some problems when using the following command.

  command 1

  ffmpeg -loop 1 -i cat.jpeg -filter_complex "scale=iw*2:-1,zoompan=z='zoom+0.002':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=720x960" -pix_fmt yuv420p -vcodec libx264 -preset ultrafast -crf 28 -y -t 5 out.mp4

  command 2 (Just adjust the scale value of command 1)

  ffmpeg -loop 1 -i cat.jpeg -filter_complex "scale=iw*8:-1,zoompan=z='zoom+0.002':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s=720x960" -pix_fmt yuv420p -vcodec libx264 -preset ultrafast -crf 28 -y -t 5 out.mp4

  Problems :

  1. The picture in the video will zoom in slowly, which is true, but until about the fourth second, the picture will return to the minimum and re-enlarge.Is this the filter parameter I used wrong ?

  2. There is a warning after running the command : [swscaler @ 0x113c66000] Warning: data is not aligned! This can lead to a speed loss. The picture size is 720 x 960 and the video is the same. 720/16 is an integer and 960/16 also an integer. So what not aligned ?

  3. There is another warning : deprecated pixel format used, make sure you did set range correctly. Did I set the pix_fmtparameter wrong ?

  4. command 2 and command 1 are different scale value, But the time they run will vary greatly (If you try to run it). Using a larger scale will have better results. So how to choose a scale value or have better way ?

• FFMPEG - How to resize an image overlay ?

  2 mars 2020, par John Doe

  I need to resize input 3 (logo.gif) to 360x360, but using scale=360:360 just made my video quality really bad. Here’s my code :

  ffmpeg -y -hide_banner -safe 0 -f concat -i "concat.txt" -i "overlay.png" -i "audio.mp3" -ignore_loop 0 -i "logo.gif" -filter_complex "[0]scale=3840x2160,zoompan=z='if(lte(zoom,1.0),1.25,max(1.001,zoom-0.0012))':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':fps=20:d=200:s=1920x1080[p];[p][1]overlay, scale=1920:1080, drawtext=fontfile=Heathergreen.otf:text=TITLE':fontcolor=black:fontsize=62:x=135:y=940, drawtext=fontfile=voxbox.ttf:text='TEXT':fontcolor=white:fontsize=70:x=120:y=885[v];[2:a]showwaves=mode=cline:s=178x56:r=20:scale=sqrt:colors=0x222222,colorkey=0x000000:0.01:0.1,format=yuva420p[w];[v][3]overlay=20:500[z];[z][w]overlay=108:740[outv]" -map "[outv]" -map 2:a -pix_fmt yuv420p -c:v libx264 -c:a aac -preset veryfast -shortest -movflags faststart -fflags genpts -r 20 "output.mp4"

  UPDATE : I’ve simply resized the image and used that as input rather than resizing during the encode. It works fine, but if anyone has an answer to this I’d be curious to know where I was going wrong.