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• Why Ffmpeg boxblur working slowly with non square area ?

  29 mai 2021, par Dmitri Dmitriev

  I've got a problem with ffmpeg boxblur if I want to blur ellipse area. No problem if you have 1 or 5 intervals for blurring, but if you have 90min movie and 150 intervals, it may be working > 6 hours. No problem with square blurring even if you have > 150 intervals, but I use ellipse. How do I do it ?

  


  Truncated command (original too long) :

  


  


  ffmpeg -y -i /data/www/records/streams/ftp/1100921_test.mp4 -loop 1 -i /tmp/tmpmajq7xhk/mask_for_1100921_test_1.png -loop 1 -i /tmp/tmpmajq7xhk/mask_for_1100921_test_2.png -loop 1 -i /tmp/tmpmajq7xhk/mask_for_1100921_test_3.png -loop 1 -i /tmp/tmpmajq7xhk/mask_for_1100921_test_4.png -loop 1 -i /tmp/tmpmajq7xhk/mask_for_1100921_test_5.png ..... -filter_complex "[0]crop=353:373:685:58, boxblur=20:enable='between(t,189.441341,189.781339)'[1] ;[0][1]overlay=685:58:enable='between(t,189.441341,189.781339)'[2] ;[0]crop=353:373:674:93, boxblur=20:enable='between(t,189.781339,189.901336)'[3] ;[2][3]overlay=674:93:enable='between(t,189.781339,189.901336)'[4] ;[0]crop=353:373:671:125, boxblur=20:enable='between(t,189.901336,190.001332)'[5] ;[4][5]overlay=671:125:enable='between(t,189.901336,190.001332)'[6] ;[0]crop=353:373:671:154, boxblur=20:enable='between(t,190.001332,190.09133)'[7] ;[6][7]overlay=671:154:enable='between(t,190.001332,190.09133)'[8] ;[0]crop=353:373:656:183, boxblur=20:enable='between(t,190.09133,190.151327)'[9] ;[8][9]overlay=656:183:enable='between(t,190.09133,190.151327)'[10] ;[0]crop=353:373:668:213 ..... -map 0:a -c:v h264_nvenc -c:a copy -movflags +faststart /data/www/records/streams/ftp/1100921_test.mp4_out.mp4

  


  


• ffmpeg : change alpha channel of a showwaves filter [on hold]

  15 février 2014, par Znuff

  I've been trying to figure this issue out for a few hours and I can't seem to find any solution.

  I'm creating a video from an .mp3 and some images with the following command

  fmpeg.exe -y -i temp\audio.mp3 -loop 1 -i Bokeh\frame-%03d.png -r 25 -filter_complex "[0:a] showwaves=size=1280x100:mode=line:r=25[wave];[1:v][wave] overlay=y=H-h:eval=init[canvas];[canvas]drawtext=fontfile='./tools/impact.ttf':fontsize=42:text='ORGANIKISMNESS':x=20:y=(h-170-text_h*2.20):fontcolor=white:shadowy=2:shadowx=2:shadowcolor=black,drawtext=fontfile='./tools/impact.ttf':fontsize=42:text='RETURN TO THE SOURCE PT.2 (ORGANIKISMNESS REMIX)':x=20:y=(h-170-text_h):fontcolor=white:shadowy=2:shadowx=2:shadowcolor=black" -shortest -acodec copy -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -tune stillimage -crf 19 -movflags faststart "videos\Organikismness-Return to the Source Pt.2 (Organikismness Remix).mp4"

  I'm trying to make the [wave] (showwaves) filter have some sort of alpha channel, to be slightly transparent to be overlayed on the rest of the video later.

  So far I've tried the blend filter, but this complains that the sources are not the same size (one is 1280x720, the showwaves source is 1280x100).

  I tried the colorchannelmixer filter, but I couldn't figure out how this should work.

  Anyone has any idea how to do it ?

• ffmpeg seek and concat without discontinuity [closed]

  11 août 2024, par pho

  I have a very simple usecase :
I want to seek mpeg videos from a camera (h264 (High) (HDMV / 0x564D4448), yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 50 tbr, 90k tbn)
Then I want to concat them in one file
I want to do it automatically from a script (that is why I use ffmpeg)
I do not want to re-encode the videos

  


  Then I get an issue :
The output file gets huge discontinuities in timestamps (for instance 10seconds) that make the file impossible to read.

  


  Here are my command lines in Linux, ffmpeg version n6.1.1-16-g33efa50fa4 :

  


  ffmpeg -y -i 00071.MTS -ss 2.000 -to 10.000 -c copy -f mpegts 00071_cut.MTS
ffmpeg -y -i 00072.MTS -ss 0.000 -to 10.000 -c copy -f mpegts 00072_cut.MTS
ffmpeg -y -i 00073.MTS -ss 15.000 -to 25.000 -c copy -f mpegts 00073_cut.MTS
ffmpeg -y -i 00074.MTS -ss 28.000 -to 38.000 -c copy -f mpegts 00074_cut.MTS
ffmpeg -y -f mpegts -i "concat:00071_cut.MTS|00072_cut.MTS|00073_cut.MTS|00074_cut.MTS" -c copy output.MTS


  


  During the concat command, I have this error when I use the *_cut.MTS files, but not when I use the raw files :
timestamp discontinuity (stream id=257): -9976000, new offset= 25480000

  


  All my *_cut.MTS files have a first pts_time between 1.4 and 2.0 seconds.

  


  What I just realized is that the issue is only there when I use the -to ou -t option to cut the end of the file

  


  The discontinuity seems to depend on the duration of the video... When I change the -t option with the following values :
20 ; 20 ; 11 ; 11 ; 10 ; 10 ; 9 ; 9 ; 8 ; 8 ; 7 ; 7 ; 6 ; 6 ; 5 ; 5 ; 4 ; 4 ;
and concat all these videos.

  


  Then I plot pts_time differences for all the packets of the output file :
Graph of dts differences

  


  I know that this kind of issue appears many times in the web, I looked for hours but did not find any clear answer.

  


  Thank you i advance for your help !