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• ffmpeg to hold last frame 10 seconds and show countdown text on video

  12 septembre 2023, par mikezang

  I have a video and I want to hold last frame for 10 seconds, and display a countdown text on the top right video, I knew hold last frame in 10 seconds as below

  


  ffmpeg -i %1.mp4 -vf tpad=stop_mode=clone:stop_duration=%2 %1-%2s.mp4


  


  I also know how to show countdown

  


  ffmpeg -i %1.mp4 -filter_complex "drawtext=fontfile='/WINDOWS/Fonts/Arial.ttf':text='%%{eif\:11-t\:d}':fontcolor=black:fontsize=24:x=w-tw-30:y=th-10:box=1:boxcolor=orange@0.4:boxborderw=10:enable='between(t,0,10)'" -c:a copy  %1-countdown.mp4


  


  My question is how can I hold last frame in 10 seconds and show countdown in that 10 seconds ? the last video will be original length + last frame in 10 seconds with countdown, does anyone help me ?

  


• ffmpeg command to scale, show images at exactly 130bpm [closed]

  17 août 2023, par S. Imp

  I have a sequence of images which I would like to display to some music that plays at 130bpm. I'll also need to scale the images, which are a rather strange 2673x2151 pixels each down to something, ideally something that would fit without stretching inside a 1080p frame — e.g. 1342x1080.

  


  130BPM yields weirdness with frame rates. There are 2.16666666667 (13/6) beats per second. This being the case, I can't figure out how many frames to show each each image at the usual frame rates (24, 25, 30 fps). If I could make a movie with a frame rate of 2.16666667 frames per second, i could simply show each image for one frame. This seems like it might actually be optimal — it would probably make a a very compact video file, right ??

  


  Alternatively, if we must set the frame rate to an positive integer value, 13 frames per second works if we just display each image for six frames. 13 FPS means 780 frames per minute. 780 frames divided by 130 beats means 6 frames per beat.

  


  Finally, my images are named j1.jpg, j2.jpg, j3.jpg, etc.

  


  Can someone help me concoct an ffmpeg command to assemble these images into a video with each image lasting one beat at 130BPM ? I've been trying to massage this command, which does assemble the images into a movie, but my attempts to specify a frame rate have had weird effects. E.g., doing a -r results in strange videos that change image very erratically. I think it's because there's a setpts=N/25/TB bit in there.

  


  ffmpeg -pattern_type glob -i "j*.jpg" -filter_complex "[0]reverse[r];[0][r]concat,loop=2:250,setpts=N/25/TB,scale=1342:1080" -pix_fmt yuv420p -c:v libx264 -preset slow -b:v 3500k output_looped.mp4


  


  Also, I don't understand what the 250 means in loop=2:250. If someone could explain that to me, I'd be grateful.

  


• How can I show that a frame has been duplicated to extend the video framerate using ffprobe ?

  14 juillet 2023, par Brandon J

  As the title suggests I have a video.mp4 which I know visually has been extended from 5fps to 20fps. I know this because there are 256 frames and when I run ffprobe it reports 20fps and the video is 12.8 sec long. I also run

  


  ffprobe -v 0 -select_streams v -show_entries stream=duration_ts,time_base,nb_frames video.mp4

  


  reports to me 256 frames, 1/20 timebase adn 256 duration. This matches the expected 12.8 s duration. When I manually sort through the extracted frames I can see the frames have been held for 4 ticks. So it should be 5fps.

  


  I then run the below to view the packets and the frames (cmd not typed)

  


  ffprobe -show_packets -select_streams v:0 video.mp4

  


  and the packets or frames don't seem to give me a huge indication that the frames have been duplicated.

  


  With the -show_packets cmd the only possible indication of duplication I can see is that every 0.2 seconds, (consistent with 5fps) the size of the packets go from a consistent 150-300 size to around 16000 or so. Is there a way I can better articulate what I am seeing with the packet size change ? Why has their compression or encoder (forgive any error in verbiage) decided to duplicate frames to achieve 20fps vs extending the pts to 0.2 seconds for each packet ? It seems like simply defining a longer pts would reduce overall file size anyways ?

  


  All that said, is there something within ffprobe or other tool I can use to more efficiently confirm what I am visually seeing to say yep these frames were just duplicated from another program ? Thanks !