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• How to detect black screen at play time in ijkplayer ?

  31 août 2019, par seaguest

  I am using ijkplayer,I am wondering if it is possible to know if current player is black screen at play time ?

  because some old model mobiles do not support hard-decode and get black screen, I need to know this case then switch to soft-decode.

• Remove .mp4 video top and bottom black bars using ffmpeg

  9 septembre 2014, par rexhin

  I’m new to ffmpeg and I have heard that it has a filter for black. I want to remove black bars on top and bottom of the video so the video will be cropped to the remaining video without black bars. Thanks :)

• ffmpeg auto crop black frame and watermark

  4 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 !