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• Overlaying alpha images on a video using ffmpeg

  10 mai 2016, par neuro_sys

  I have the following ffmpeg-cli command which does not produce the described effect in documentation. Could this be a bug, or I have something wrong with the command.

  ffmpeg \
  
      -y \
  
      -i small.mp4 \
  
      -i monkey/monkey_%04d.png \
  
      -filter_complex "[0:v][1:v]overlay=enable='between(t,1,5)'[out1]" \
  
      -map '[out1]' \
  
      output.mp4

  I expect it to overlay the #1 stream on top of #0 between seconds 1 and 5.

  You may download the test tarball from this link :

  • https://drive.google.com/file/d/0BxIQVP1zErDPYXRveG9hN0c0Qjg/view?usp=sharing

  It includes assets for the test case.

  The build I tried with :

  • ffmpeg-3.0.2-64bit-static (available online)

• high memory & cpu usage in ffmpeg C sample when muxing audio and video

  24 juin 2016, par chandu

  I am using the muxing.c example provided with ffmpeg 3.0 version to create an MP4 file (H.264 & AAC) with VS 2013.

  The sample is working fine with default width & height for video, but when I changed the width to 1920 and height to 1080, the sample is taking nearly 400MB & 60-70% cpu usage (using task manager & in Release mode) throughout the program. I have used multi threading also.

  I tried to free the encoded packet after calling write_frame(), but to no success.
  The memory is being released only after calling avcodec_close().

  Could anybody please tell me what I am doing wrong ?

  I am adding link (https://drive.google.com/open?id=0B75_-V7se7tmWUhyM0ItS0kzUVk) to code I tested with VS 2013.

  The screenshot link https://drive.google.com/open?id=0B75_-V7se7tmVm4tUjFtSnNNSHc

  The STREAM_DURATION value in the sample is set to 120 seconds (even tested with 600 seconds) and I changed default Height & Width values of AVCodecContext in add_stream function for video type to 1080 & 1920 respectively. Through out program, it is taking 355 MB, not changing at all. I think, once frame is encoded using avcodec_encode_video2 and written to the file, the memory should be released.

  Please correct me if I am wrong.

• New Piwik Mobile 2 Beta app (Android only)

  9 décembre 2014, par Thomas Steur — Piwik Mobile Releases

  Are you interested in testing our newest features, bug fixes and performance improvements before they make it to our next Piwik Mobile version ?

  Check out our new app Piwik Mobile 2 Beta on Google Play. This beta includes more than 15 bugfixes and improvements.

  We have been testing as much as we could. Now is your time to experiment and help us to track down any bugs, or even suggest usability improvements. Start using it and send us any feedback or issue a bug. We can improve Piwik Mobile much better with your help !

  Be aware that this version may contain bugs, if you are interested in a more stable version install Piwik Mobile 2 instead.