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  • Using ffmpeg create an android playable music slide show

    22 avril 2014, par user2637966

    I am now creating a music slide mp4 video and going to play it in android device with ffmpeg.

    I used the following command to accomplish this mission.

    The first one is to inputting a batch of jpg files and convert it to a mp4 file.

    1.)C:/xampp/htdocs/bin/ffmpeg -y -r 1/5 -i C:/xampp/htdocs/bin/%03d.jpg -c:v libx264 -profile:v baseline -level 3.0 -r 30 -pix_fmt yuv420p C:/xampp/htdocs/bin/out.mp4

    The second one is to putting the audio to the previous created video.

    2.)C:/xampp/htdocs/bin/ffmpeg -i C:/xampp/htdocs/bin/out.mp4 -i C:/xampp/htdocs/upload/1.mp3 -y -map 0 -map 1 -codec copy -shortest C:/xampp/htdocs/bin/haha.mp4"

    Both of the command are correct and created the mp4 file. However only out.mp4 can be played in android deivce while haha.mp4 cannot.

    So it seems the audio track violate the android mp4 requirement. What should the second command be so that i can play the mp4 file in android device.

  • FFMPEG show audio frequency waves with border

    13 juillet 2020, par Nikhil Solanki

    I am trying to generate sine waves or audio frequency like this using this command :

    


    ffmpeg -i combine2.mp4 -i image1.png -i song.mp3 -t 20 -filter_complex "[0]split=2[color][alpha]; [color]crop=iw/2:ih:0:0[color]; [alpha]crop=iw/2:ih:iw/2:ih[alpha]; [color][alpha]alphamerge[v1];
[1]scale=540:960, setsar=1[v2];
[2]showfreqs=s=540x100:mode=line:ascale=sqrt:colors=white|red[v3];
[v2][v3] overlay=main_w-overlay_w:main_h-overlay_h-10[v4];
[v4][v1] overlay=1" output_video2.mp4 -y


    


    This command shows frequency of audio with white colour only and also its not smooth as above image. So, how can I generate waves like above image smooth and bordered ?

    


    Output video :
screenshot

    


  • Revision 99a132f561 : Add a seg map preservation test vector. Add a test vector to show the cases whe

    13 octobre 2014, par Alex Converse

    Changed Paths :
     Modify /test/test-data.mk


     Modify /test/test-data.sha1


     Modify /test/test_vectors.cc



    Add a seg map preservation test vector.

    Add a test vector to show the cases where segmentation map is preserved
    from frome to frame as outlined in the inquiry in issue 761.

    Change-Id : I630c6aba27d0d0b109cc7fd7c6fcd008222a0cf3

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