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• FFmpeg - Finally compiled. Now what ?

  1er juin 2016, par Gopgop

  OK So here is my story :

  I am creating an app that requires me to take a couple images and a video and merge them together. At first I had no idea what to use, never heard of ffmpeg or ndk.. After around 5 days of battling NDK, switching to Ubuntu and going crazy with ndk-build commands I finally got FFmpeg to compile using the dolphin-player example. Now that I can run ffmpeg on my computer and android device I have no idea what to do next.

  Here are the main questions I have :

  • To use FFmpeg, I saw that I need to use some sort of commands. First off what are these commands, where do I run them ?

  • Second of all, Are the commands all I need ? By that I mean can i just run my application normally, somewhere in it execute the commands in some way and it will do the rest for me ? or do I need some sort of element in the code, for example VideoEncoder instance or something..

  • Third of all, I saw people using NDK to use FFmpeg, Do I have to ? Or is it optional ? I would like to avoid using C if possible as I don’t know it at all..

  • OPTIONAL : Last but not least, Is this the best way of handling what I need to do in my application ? If so, can someone guide me in a brief manner of how to use FFmpeg to accomplish said task (mention commands or anything like this)..

  I know it’s a wall of text but every question is important to me !

  Thank you very much stackoverflow community !

• ffmpeg - recode to lower bitrate + remove audio + watermark

  26 avril 2014, par Ove Sundberg

  I’m a complete noob to ffmpeg and I’m trying to do a couple of things in the same call :

  1) recode a video to a lower bitrate

  2) remove audio

  3) add a watermark center bottom

  4) save output as .webm

  With a bit of RTFM and scouring for examples I have managed to achieve of 1, 2 and 4 with :

  ffmpeg -i hires.mp4 -c:v libvpx -crf 10 -b:v 128k -r 24 -an -c:a libvorbis output-file.webm

  This call adds a watermark center bottom :

  ffmpeg -i hires.mp4 -i watermark.png -filter_complex "overlay=main_w/2-overlay_w/2:main_h-overlay_h-10" output-file.webm

  Now I struggle to combine the two. The second -i option is the watermark. Therefore I would have thought that

  ffmpeg -i hires.mp4 -c:v libvpx -crf 10 -b:v 128k -r 24 -an -c:a libvorbis -i watermark.png -filter_complex "overlay=main_w/2-overlay_w/2:main_h-overlay_h-10"  output-file.webm

  would do the trick. It does not off course, the error I get is

  Option b:v (video bitrate (please use -b:v)) cannot be applied to input file watermark.png -- you are trying to apply an input option to an output file or vice versa. Move this option before the file it belongs to. Error parsing options for input file watermark.png. Error opening input files: Error number -22 occurred

  So I have the options all messed up. I’ve tried moving the options around but with no luck. I’d really appreciate some help here.

• x86/hevc_deblock : remove some duplicated instructions

  18 mai 2014, par James Almer

  x86/hevc_deblock : remove some duplicated instructions
  Also remove a couple unnecessary cmps
  Signed-off-by : James Almer <jamrial@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/x86/hevc_deblock.asm