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Sur d’autres sites (9534)

  • How to generate a video from image sequence of set duration

    4 septembre 2021, par Sherali Karimov

    I have a sequence of images, one per frame. Sometimes some frames are missing in random parts.

    


    If it possible to instruct ffmpeg to generate a video of a pre-set length in number of frames from this sequence replacing missing frames with a black screen ?

    


    This would allow us to notice that frames are missing during the visual inspection.

    


    I tried to overlay the stream of images with a loop of another, black, image but I don't know how to tell it to force continue looping for N frames...

    


    The OS is CentOS 8.
Here is how I am combining them now :

    


    ffmpeg -y -nostdin -hide_banner -thread_queue_size 4096 
    -start_number 1 -framerate 25 -apply_trc iec61966_2_1 -i /data/OUT/RENDER/MG013/MG013_007/beauty/MG013_007.Beauty.%04d.exr 
    -start_number 1 -framerate 25 -apply_trc iec61966_2_1 -i /data/OUT/RENDER/MG013/MG013_007/chars/MG013_007.Beauty.%04d.exr 
    -filter_complex "[0:v]copy[out];[out][1:v]overlay=x=(W-w)/2:y=(H-h)/2[out];[out][out]" -c:v libx264  -pix_fmt yuv420p  
    -profile:v baseline  -refs 2  -crf 18 -map '[out]' -s 1920x1080 -t 1.875 /data/MG/episodes/MG013/story/playblasts/render/MG013_007.mov


    


    This is working, except for the cases of missing frames...

    


    Thank you !

    


  • Feed output of one filter to the input of one filter multiple times with ffmpeg

    27 août 2021, par kentcdodds

    I have the following ffmpeg commands to create a podcast episode :

    


    # remove all silence at start and end of the audio files
ffmpeg -i call.mp3 -af silenceremove=1:0:-50dB call1.mp3
ffmpeg -i response.mp3 -af silenceremove=1:0:-50dB response1.mp3

# remove silence longer than 1 second anywhere within the audio files
ffmpeg -i call1.mp3 -af silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-50dB call2.mp3
ffmpeg -i response1.mp3 -af silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-50dB response2.mp3

# normalize audio files
ffmpeg -i call2.mp3 -af loudnorm=I=-16:LRA=11:TP=0.0 call3.mp3
ffmpeg -i response2.mp3 -af loudnorm=I=-16:LRA=11:TP=0.0 response3.mp3

# cross fade audio files with intro/interstitial/outro
ffmpeg -i intro.mp3 -i call3.mp3 -i interstitial.mp3 -i response3.mp3 -i outro.mp3
  -filter_complex "[0][1]acrossfade=d=1:c2=nofade[a01];
                   [a01][2]acrossfade=d=1:c1=nofade[a02];
                   [a02][3]acrossfade=d=1:c2=nofade[a03];
                   [a03][4]acrossfade=d=1:c1=nofade"
  output.mp3


    


    While this "works" fine, I can't help but feel like it would be more efficient to do this all in one ffmpeg command. Based on what I found online this should be possible, but I don't understand the syntax well enough to know how to make it work. Here's what I tried :

    


    ffmpeg -i intro.mp3 -i call.mp3 -i interstitial.mp3 -i response.mp3 -i outro.mp3
       -af [1]silenceremove=1:0:-50dB[trimmedCall]
       -af [3]silenceremove=1:0:-50dB[trimmedResponse]
       -af [trimmedCall]silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-50dB[noSilenceCall]
       -af [trimmedResponse]silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-50dB[noSilenceResponse]
       -af [noSilenceCall]loudnorm=I=-16:LRA=11:TP=0.0[call]
       -af [noSilenceResponse]loudnorm=I=-16:LRA=11:TP=0.0[response]
      -filter_complex "[0][call]acrossfade=d=1:c2=nofade[a01];
                       [a01][2]acrossfade=d=1:c1=nofade[a02];
                       [a02][response]acrossfade=d=1:c2=nofade[a03];
                       [a03][4]acrossfade=d=1:c1=nofade"
  output.mp3


    


    But I have a feeling I have a fundamental misunderstanding of this because I got this error which I don't understand :

    


    Stream specifier 'call' in filtergraph description 
[0][call]acrossfade=d=1:c2=nofade[a01];
[a01][2]acrossfade=d=1:c1=nofade[a02];
[a02][response]acrossfade=d=1:c2=nofade[a03];
[a03][4]acrossfade=d=1:c1=nofade
       matches no streams.


    


    For added context, I'm running all these commands through @ffmpeg/ffmpeg so that last command actually looks like this (in JavaScript) :

    


    await ffmpeg.run(
  '-i', 'intro.mp3',
  '-i', 'call.mp3',
  '-i', 'interstitial.mp3',
  '-i', 'response.mp3',
  '-i', 'outro.mp3',
  '-af', '[1]silenceremove=1:0:-50dB[trimmedCall]',
  '-af', '[3]silenceremove=1:0:-50dB[trimmedResponse]',
  '-af', '[trimmedCall]silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-50dB[noSilenceCall]',
  '-af', '[trimmedResponse]silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-50dB[noSilenceResponse]',
  '-af', '[noSilenceCall]loudnorm=I=-16:LRA=11:TP=0.0[call]',
  '-af', '[noSilenceResponse]loudnorm=I=-16:LRA=11:TP=0.0[response]',
  '-filter_complex', `
[0][call]acrossfade=d=1:c2=nofade[a01];
[a01][2]acrossfade=d=1:c1=nofade[a02];
[a02][response]acrossfade=d=1:c2=nofade[a03];
[a03][4]acrossfade=d=1:c1=nofade
  `,
  'output.mp3',
)


    


  • How to generate a video of set duration in frames from image sequence

    4 septembre 2021, par Sherali Karimov

    I have a sequence of images, one per frame. Sometimes some frames are missing in random parts.

    


    If it possible to instruct ffmpeg to generate a video of a pre-set length in number of frames from this sequence replacing missing frames with a black screen ?

    


    This would allow us to notice that frames are missing during the visual inspection.

    


    I tried to overlay the stream of images with a loop of another, black, image but I don't know how to tell it to force continue looping for N frames...

    


    The OS is CentOS 8.
Here is how I am combining them now :

    


    ffmpeg -y -nostdin -hide_banner -thread_queue_size 4096 
    -start_number 1 -framerate 25 -apply_trc iec61966_2_1 -i /data/OUT/RENDER/MG013/MG013_007/beauty/MG013_007.Beauty.%04d.exr 
    -start_number 1 -framerate 25 -apply_trc iec61966_2_1 -i /data/OUT/RENDER/MG013/MG013_007/chars/MG013_007.Beauty.%04d.exr 
    -filter_complex "[0:v]copy[out];[out][1:v]overlay=x=(W-w)/2:y=(H-h)/2[out];[out][out]" -c:v libx264  -pix_fmt yuv420p  
    -profile:v baseline  -refs 2  -crf 18 -map '[out]' -s 1920x1080  /data/MG/episodes/MG013/story/playblasts/render/MG013_007.mov


    


    This is working, except for the cases of missing frames...

    


    Ideally I would love to instruct it to generate, for instance, 450
frames and it to fill in the missing frames with blanks.

    


    Thank you !

    


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