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• getruntime() exec() with double quotes in command

  29 décembre 2012, par brux

  I want to execute an ffmpeg command, the method I am using works with every command on my list except the following one which contains double quotes to set a filter (-vf) parameter

  ffmpeg -i 2012-12-27.mp4 -vf "movie=bb.png [movie]; [in] [movie] overlay=0:0 [out]" -vcodec libx264 -acodec copy out.mp4

  I have tried changing the quotes for single quotes with no luck. The command works at the android terminal with both single and double quotes.

  The app I'm developing uses about 5 ffmpeg commands, all work except this one, is this some bug ?

  I can't find a concrete solution to this problem, breaking the args into an array and then passing this to runtime().exec() as suggested elsewhere doesn't seem to work, or simply trying to escape the quotes with \" won't work.

  Both of the files referenced in the above command are located in the sdcard, I removed the concatenation of the command out so that things don't get messy, rest assured these commands work in a terminal when referencing the full paths to the files.
  I contatenate the string passed to getRuntime().exec() using a stringbuilder and`getexternalstorageDirectory().getabsolutepath() to get the path to each file like I have been doing with previous commands when using the process class.

  I am using Jelly Bean 4.2 in case that is of any significance.

• ffmpeg does not apply watermark on first generated frame (wm is applied on all other frames)

  3 juillet 2013, par JohnSmith

  I am generating a bunch of jpgs from a movie, and want the watermark to be applied to all the jpgs. This works fine for all frames, but the first one, and I cannot figure out why.

  This is the command I use

  ffmpeg -vframes 16 -ss 00:00:01 -i a.mov -t 00:00:17 -r 1 -s 1280x720 -vf "movie=watermark.png,scale=1280:720 [wm];[in][wm] overlay=0:0 [out]" '/tmp/output%d.jpg'

  which will give me these files :

  output1.jpg
  
  output2.jpg
  
  output3.jpg
  
  output4.jpg
  
  output5.jpg
  
  output6.jpg
  
  output7.jpg
  
  output8.jpg
  
  output9.jpg
  
  output10.jpg

  where they all BUT output1.jpg has got watermark applied.

  I cannot figure out why ffmpeg does not apply the watermark on the first one.

  I am using ffmpeg 1.2 on debian

• php exec command to encode video to h.264 mp4 file using ffmpeg and x264 tool on ubuntu

  7 avril 2012, par matt

  I have a dedicated server with ffmpeg and the x264 tool installed. I can encode any video and works really well. But now I need to encode videos to play on iPads, iPhones... the format needs to be mp4 and using the h.264 codec.

  I'm using PHP to enconde videos, I'm just looking for an exec command to do the above encoding.
  what I'm using for the other videos is :

  exec("ffmpeg -i movie.mov -sameq -acodec mp3 -ar 22050 -ab 32 -f flv -s 1280x720 movie.flv");

  I just need something similar to that for encoding mp4
  by the way, I can't use libx264. I can only use the x264 tool

  Cheers