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• compression android video trimmer ffmpeg Exoplayer2 [closed]

  6 mars 2024, par andrew cummins

  I'm trying to compress the video trimmed android video

  


  I have some android code from github that I've been working on. The code is a video trimmer in enter image description hereAndroid. However I'm trying to compress the video after the video is trimmed. Here's the source code

  


  https://github.com/a914-gowtham/android-video-trimmer

  


  I was able to modify the timeline that's generated with a set duration minimum similar to a whatsapp status, with a set max at 10 sec and max 90 seconds

  


  // TrimType.MIN_MAX_DURATION TrimVideo.activity(videoUri) .setTrimType(TrimType.MIN_MAX_DURATION) .setMinToMax(10, 90)  //seconds .start(this,startForResult);

  


  Now all is is working fine but I'm trying to compress the file after the video is trimmed and add an overlay.

  


  Any ideas would be helpful

  


• How to process float32 arrays by video compression tools and get back float32 values ? Video and image formats which natively supports float32 values

  7 février 2024, par VojtaK

  I have multiple arrays of float32 values, which might be interpreted as images. They go in the sequence. They are one channel only and they don't restrict itself to [0,1] range.

  


  I would like to process them by ffmpeg and create compressed video out of them. Then I want to decompress them to the sequence of images, or possibly also raw array of float values.

  


  Let's say I have RAWARRAYSFILE of float32 of frames with given dimensions and I want to convert it to the video. In ffmpeg there is a pix_fmt gray32le and I can convert my raw files into the video using e.g.

  


  DIMX=3250
DIMY=2132
dd if=$RAWARRAYSFILE |  ffmpeg -y -framerate 30 -f rawvideo -s "${DIMX}x${DIMY}" -pix_fmt grayf32le  -i - vid.mp4


  


  Now to get the sequence of the images back, I can

  


  ffmpeg -i vid.mp4 -pix_fmt grayf32le out/processed%05d.tif


  


  However not the vid.mp4 video nor out/processed%05d.tif will be float32. Are there a formats supported by ffmpeg which would support float32 natively ?

  


  Are you aware of any image format, which would natively support float32 values ?
Are you aware of any video format, which would natively support float32 values ?

  


• As part of my program that I am writing I am using ffmpeg. I am debugging. Why would ffmpeg run slower on a GPU than a CPU when doing mp4 compression ? [closed]

  6 mai 2023, par user875234

  I'm running it on modern equipment with latest drivers. I use it to compress video files, like so :

  


  ffmpeg -i 20230502_200913.mp4 -vcodec libx265 -crf 28 -vf "scale=trunc(iw/10)*2:trunc(ih/10)*2" output.mp4


  


  that command runs in 160 seconds on the CPU. but if I use the GPU, like so :

  


  ffmpeg -hwaccel cuda -i 20230502_200913.mp4 -vcodec libx265 -crf 28 -vf "scale=trunc(iw/10)*2:trunc(ih/10)*2" output.mp4


  


  it actually takes 280 seconds. And again, these are same era CPU and GPU. I can see it uses 100% of the GPU when running on the GPU but only 50% of the CPU when running on the CPU. I expected it to run much faster on the GPU than the CPU.

  


  Am I missing something ?