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• The most efficient way to generate mp4 video containing looped boomerang-alike video file ?

  29 juillet 2019, par B. Palka

  I’ve developed an Android app that allows user to create boomerang-alike mp4 video. This video consists of 10 still images being played back and forth quite fast. I know that such video (boomerang effect) can be easily looped from single video file while playing it, but I really need to create a mp4 video that would essentially contain already prepared boomerang video. The output video can be downloaded and played by user on any external player (over which obviously I don’t have any control).

  For that purpose currently I create a video from images in a loop. The loop starts from 1st picture and goes to 10th picture with 0.25 sec delay between frames, then goes back from 10th to 1st including delay. And there is 5 of those loops, which essentialy means creating a single video from 5 * 10 * 2 = 100 images. I know it’s kinda ridiculous, so the time that it takes to prepare this video is riduculous as well (around 1:40 min).

  What solution could you recommend assuming that the output video really has to consist of 5 loops back-and-forth ? I’ve thought about creating single loop video (20 pictures) and then create final output video by concatenating it 5 times. But could it be any good ? I’m trying to find an efficient yet understandable for a beginner Android programmer way.

• encoding images to video with ffpmeg

  29 septembre 2012, par AndroidGeek

  We are working on Android 3D Animation App.

  We need to identify images, then save and encode the same to video using FFmpeg (Since Android API is not supporting). Once the video is generated, then audio is appended to the same.

  We are facing 2 problems on this.

  First is the memory leakage issue at the time of saving identified images for encoding. CPU of emulator is getting overloaded. Whether FFpmeg is called every time when an image is selected ? How to resolve this issue ?

  Second (in case if we get through the first one) we are not able to encode the selected images, since this is generating green color video. What could be reason for this ?

  Whether is there any tool other than FFmpeg for video encoding from images to H264 ?
  Whether images version (Rastar or Vector) will impact this video encoding ?
  Whether Android OS version is considered ?

  Any valuable inputs on this will be greatly appreciated.

  Thanks

• Moviepy write_videofile changes number of video and audio frames even after using 'rawvideo' as the codec parameter

  14 mars 2019, par Jaideep Sagar

  I am using moviepy (Python) to read video and audio frames of a video and after making some changes I am writing them back to a videofile, say new.avi, to preserve the changes, or to avoid compression, I am using codec= ’rawvideo’ in write_videofile function. But when I read the video and audio frames back, the number of video and audio frames are different than when they were when written, they are usually increased.
  Can anybody tell me the reason, ? is it because of the ffmpeg used or some other reason ? Does it happen always or there is some problem in my machine ? Thank you :-)