Recherche avancée

Sur d’autres sites (8046)

• fftools/ffmpeg_enc : avoid breaking exactly integer timestamps in vsync code

  28 mai 2023, par Anton Khirnov

  fftools/ffmpeg_enc : avoid breaking exactly integer timestamps in vsync code
  The code will currently add a small offset to avoid exact midpoints, but
  
  this can cause inexact results when a float timestamp is exactly
  
  representable as an integer.
  Fixes off-by-one in the first frame duration in multiple FATE tests.
  

  • [DH] fftools/ffmpeg_enc.c
  • [DH] tests/ref/fate/apng-osample
  • [DH] tests/ref/fate/film-cvid
  • [DH] tests/ref/fate/filter-concat-vfr
  • [DH] tests/ref/fate/gif-gray

• How to make watermark move till the video ends in FFMPEG

  27 décembre 2022, par Мохамед Русланович

  am using this command to move watermark around my video. It's working but it only move once around the edges and then desapers

  


  ffmpeg -i film.mp4 -i logo_white.png -filter_complex "[0][1]overlay=x='0+(t-0)*(W-w)/5':y=0:enable='between(t,0,5)'[img];[img][1]overlay=x=W-w:y='0+(t-5)*(H-h)/5':enable='between(t,5,10)'[img];[img][1]overlay=x=(W-w)-(t-10)*(W-w)/5:y=H-h:enable='between(t,10,15)'[img],[img][1]overlay=x=0:y=(H-h)-(t-15)*(H-h)/5:enable='between(t,15,20)'"  output2.mp4


  


  I also tried this command using the -loop tag

  


  ffmpeg -t 20 -loop 1 -i film.mp4 -i logo_white.png  -loop 0  -filter_complex "[0][1]overlay=x='0+(t-0)*(W-w)/5':y=0:enable='between(t,0,5)'[img];[img][1]overlay=x=W-w:y='0+(t-5)*(H-h)/5':enable='between(t,5,10)'[img];[img][1]overlay=x=(W-w)-(t-10)*(W-w)/5:y=H-h:enable='between(t,10,15)'[img],[img][1]overlay=x=0:y=(H-h)-(t-15)*(H-h)/5:enable='between(t,15,20)'" output2.mp4


  


  But it throws an error (option loop not found)

  


  How to repeat the overlay over and over till the video ends ?

  


• ffmpeg - invalid duration

  22 septembre 2016, par OmidAntiLong

  For a project I’m working on I have a small bash script that loops over an input csv file of timecodes, and uses ffmpeg to create screenshots of a given film at each timecode. The csv file is in the format hh:mm:ss,id - it looks like this (extract)

  00:00:08,1
  
  00:00:49,2
  
  00:01:30,3
  
  00:02:38,4
  
  00:03:46,5
  
  00:04:08,6
  
  00:04:26,7
  
  00:04:37,8
  
  00:04:49,9
  
  00:05:29,10
  
  00:05:52,11
  
  00:06:00,12
  
  00:06:44,13
  
  00:07:49,14
  
  00:08:32,15
  
  00:09:28,16
  
  00:10:17,17
  
  00:10:44,18
  
  00:11:48,19
  
  00:12:07,20

  I’ve used it without issue in the past, but today I’ve come to update some of the films and I’m getting a weird issue where ffmpeg is complaining that my input timecode is invalid, despite being in the right format.

  The new input csv files are the same format as the old ones, but it seems like every so often ffmpeg drops the hours from the hh:mm:ss timestamp. If I comment out the ffmpeg line, everything prints to the terminal as expected (but obviously I get no screenshots).

  This is my loop code :

  while read code a
  
  do
  
    echo $code
  
    f="$(printf "%03d" $i)"
  
  
  
    ffmpeg -loglevel error -y -ss $code -i $FILM -vframes 1 -q:v 2 $OUTPUT/$f.jpg
  
  
  
    ((i++))
  
  done < $INPUT

  I’ve tried all sorts, including padding the csv with extra 0s - which works until the hours tick over to 01.

  

  Does anyone have any ideas ? I’m scratching my head.

  Cheers