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Sur d’autres sites (5410)

  • ffmpeg crop and watermark in a single step

    11 juin 2018, par rbarab

    We are processing short videos. Most of them are 640x480, recorded by mobile. Many of them have a black frame on left and right.
    I would like to watermark the videos and currently using this command.

    ffmpeg -i IN.mp4 -i WATERMARK.png -filter_complex "overlay=main_w-overlay_w-10:main_h-overlay_h-10" OUT.mp4

    The problem is that if there is a frame, part of the watermark goes on the frame and only a part is on the actual content. Would like to place the watermark on the bottom right of the actual content.

    Are any of these possible, or any other ideas ?

    a, Dynamically detect the black frames and adjust the watermark position accordingly.

    b, Crop the black frame and watermark the content correctly in the same step.

    Thanks a lot for your help !

    EDIT :

    I have found that it won’t be possible in one step.

    1, I can get the crop size

    ffmpeg -i INPUT.mp4 -t 2 -vf cropdetect -f null - 2>&1 | awk '/crop/ { print $NF }' | tail -1

    2, Then crop the video

    ffmpeg -i INPUT.mp4 -filter:v "crop=352:480:144:0" -c:a copy OUTPUT.mp4

    3, Then watermark it

    ffmpeg -i INPUT VIDEO.mp4 -i INPUT IMAGE.png -filter_complex "overlay=main_w-overlay_w-10:main_h-overlay_h-10" OUTPUT VIDEO.mp4

    Is there a way to merge 2, and 3, into a single step ?

  • FFmpeg concatenation, no Audio in Final Output

    12 septembre 2016, par user4889724

    I have the following command working in ffmpeg, which adds 1 second of a black frame to the beginning of the video. However, I lose the audio from the original video in the output video. How can I adjust the command to make sure the original audio stays with the final output, or better yet, there is 1 second of "blank" audio at the beginning so it matches the new output video.

    ffmpeg -i originalvideo -f lavfi -i color=c=black:s=1920x1080:r=25:sar=1/1 -filter_complex "[0:v] setpts=PTS-STARTPTS [main]; [1:v] trim=end=1,setpts=PTS-STARTPTS [pre]; [pre][main] concat=n=2:v=1:a=0 [out]" -map "[out]" finaloutputvideo.mp4

  • iOS how to build ffmpeg

    10 février 2012, par zvoice

    How to build ffmpeg for iOS ? I have got 5.0 framework and scripts from iFrameExtractor fail to build it with - invalid operand on inline asm ldr $0:q, $1

    Do you have a successfull experience with it ?

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