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• Optimizing Painting video encoding in Android

  26 octobre 2013, par coder000001

  I want to create live painting video as export feature for a painting application.

  I can create a video with a series of images, with the use of a library ( FFMPEG or MediaCodec). But, this would require too much processing power to compare the images and encode the video.

  While drawing, I know exactly which pixels are changed. So, I can save lot of processing if I can pass this info to FFMPEG, instead of having the FFMPEG figure this out from the images.

  Is there away to efficiently encode the video for this purpose ?

• Unable to play clear content packaged using ffmpeg mpeg-dash -single_file option

  20 novembre 2017, par diS

  Able to package the mpeg-dash clear content into a single file using -single_file option but unable to play the content.

  ffmpeg command :

  ffmpeg -y -loglevel info -loglevel verbose -err_detect careful -analyzeduration 8000000 -probesize 4000000 -rtbufsize 300000 -flush_packets 0 -fflags +genpts+discardcorrupt -f mpegts -i Sample_Input.ts -i -map 0:p:1:0 -c copy -f dash -window_size 24 -min_seg_duration 4 -use_timeline true -use_template true -single_file true live.mpd

  Able to package and play using below command :

  MP4Box -dash 150000 -dash-profile onDemand -segment-name chunk-stream clear.mp4

  Am I Missing any parameters while packaging with ffmpeg command ?

  FFMPEG latest code from https://git.ffmpeg.org/ffmpeg.git
  commit :- ce001bb8fc6677541c401a614e05e5058d58dde1

  Thank you in advance.

• Best ffmpeg options for creating TikTok-like app ? [closed]

  27 août 2022, par nickcoding

  My app is essentially vertical videos, so I'd like the videos to more or less be cropped to that dimension (especially in the case they are 'landscape mode' videos. In the below picture, if the video is that horizontal black rectangle, we should just crop the video to that dimension of the phone (the red vertical rectangle). I've tried messing around with aspect ratios, but can't seem to get it to work right (where the video is essentially cropped to the correct aspect ratio), but not necessarily hard-coding the dimensions (this would look bad on different size devices).

  


  I'm using this module : https://www.npmjs.com/package/fluent-ffmpeg

  


  How should I do this ?

  


  https://i.stack.imgur.com/bb8qR.png

  


  var ffmpeg = require('fluent-ffmpeg');

  ffmpeg('./original.mp4')
    .fps(25)
    .videoCodec('libx264')
    // here, I've tried .withAspectRatio('16:9') and playing around with .size(), but that seems to do nothing.
    .save('./new.mp4');