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Sur d’autres sites (10746)

  • How to timestamp video with seconds and milliseconds with ffmpeg ? [closed]

    10 février, par JulianJ

    I am trying to timestamp an .mp4 video with seconds and milliseconds using ffmpeg.
I can timestamp with hours, minutes, seconds and milliseconds using the code below but just can't figure out how to print seconds and milliseconds.

    


    ffmpeg -i input.mp4 -vf "drawtext=:text='%{pts\:s}':rate=25:start_number=0:x=(w-tw)/2:y=h-(3*lh):fontcolor=white:fontsize=50,drawtext=:text='%{pts\:hms}':rate=25:start_number=0:x=(w-tw)/2:y=h-(2*lh):fontcolor=white:fontsize=50" output.mp4


    


  • FFMpeg - Freeze First Frame for X seconds

    13 mars 2021, par John Doe

    I need to pause/freeze the first frame of the video for 2 seconds before proceeding to the scroll effect. Here's what I have :

    


    ffmpeg -y -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -loop 1 -i "temp.jpg" -i "floating.png" -filter_complex "[1:v]fps=fps=30,crop=1280:720:0:'t*(ih-oh)/120',overlay,scale=1280x720,drawtext=fontfile='font.ttf':text='text here':x=20:y=675:fontsize=60:fontcolor=white:shadowcolor=black:shadowx=2:shadowy=2,drawtext=fontfile='font.ttf':text='more text':x=w-tw-20:y=670:fontsize=70:fontcolor=white:shadowcolor=black:shadowx=2:shadowy=2[out]" -t 10 -map "[out]" -map "0:a" -shortest -c:v h264_qsv -c:a aac -ac 2 -ar 44100 -vb 30M -r 30 "video.mp4"


    


    Any ideas ?

    


  • How can I convert WebM file to WebP file ?

    24 août 2020, par c-an

    I tried it with ffmpeg.

    


    ffmpeg input.webm output.webp


    


    input.webm contains transparent background and But the alpha channel becomes white in webp. I think that means alpha channel doesn't come together.

    


    I extracted frames with this command :

    


    ffmpeg -i input.xxx -c:v libwebp output_%03d.webp


    


    And it also gives me webp files with white background.

    


    How can I convert it properly with alpha channel ? OR should I convert it from other format(extension) ?

    


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