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Sur d’autres sites (7305)

  • concat 2 videos with sound and loop with the other audio which is longer or shorter

    27 juillet 2021, par Andy

    I have audio.mp3 can be longer or shorter than concat of 2 videos with sound.

    


      

    • If audio > video, video will be looped until audio stops

      • 


    • If audio < video, ffmpeg will ends when audio stops

      • &#xA;

    &#xA;

    Currently, I have to use 2 lines :

    &#xA;

    ffmpeg -y -i v1.mp4 -i v2.mp4 -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0?]concat=n=2:v=1:a=1[outv][outa]" -c:v libx264 -map "[outv]" -map "[outa]" v12.mp4&#xA;

    &#xA;

    and

    &#xA;

    ffmpeg -i audio.mp3 -stream_loop -1 -i v12.mp4 -filter_complex "amovie=${BODY12}:loop=0,volume=0.5,apad[A];[0:a][A]amerge[outa]" -c:v copy -c:a aac -map 1:v -map "[outa]" -shortest -y newvideo.mp4&#xA;

    &#xA;

    Do you have any suggestions to combine 2 lines above to 1 line ffmpeg to reduce time for rendering ? Thanks.

    &#xA;

  • Get middle line from the output of a command

    14 décembre 2022, par Kishore T

    The following command list the duration of I-frames present in a video file.

    &#xA;

    ffprobe -i ./test.mp4 -v quiet -skip_frame nokey -select_streams v:0 -of flat -show_entries frame=pkt_pts_time | awk -F&#x27;=&#x27; &#x27;{gsub(/"/, "", $NF); print $NF}&#x27;&#xA;

    &#xA;

    I'm trying to get the duration of I-frame that is in middle. The output of the above command will be like

    &#xA;

    0.066667&#xA;2.066667&#xA;4.066667&#xA;9.066667&#xA;14.066667&#xA;19.066667&#xA;24.066667&#xA;

    &#xA;

    How do I get the middle value ? Here, I would like to get 9.066667 as the result. If the number of lines is even (say I've 2 values), I need to get the 1st value.

    &#xA;

    I tried using wc to get the number of lines and sed to print the middle line. But, this straightforward solution required me to run the command twice. I tried piping the command, but I didn't find any solution for storing the value in a variable (from the wc command) and using the same in another command (sed command) while retaining the piped output.

    &#xA;

  • How to make video effect in video by ffmpeg module in Node JS ?

    20 juin 2015, par Nazmul Hossain Bilash

    I am working with ffmpeg. I want to give effects in video like grayscale, Sepia, Blur in video. Also I want to add text in those videos. How can I make this with ffmpeg in node js. I have worked with fluent-ffmpeg & ffmpeg node module.

    I have seen this article : https://trac.ffmpeg.org/wiki/FancyFilteringExamples Here is the example of video effect by ffmpeg command. But I need to to how I can make this effects through Node JS.

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