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• windows : Use native threads by default

  16 octobre 2015, par Henrik Gramner

  windows : Use native threads by default
  — disable-win32thread can be passed as an argument to configure to compile
  
  with pthreads, which was the old default behavior.
  

  • [DH] configure

• How to dynamically merge videos in react native

  23 janvier 2018, par sphraax

  Hey I’m trying to make a kitten app but I got a very difficult challenge which is to merge videos dynamically :
  The logic is the following :

  1 - User1 creates a video, this can be uploading an existing one, or recording a new one.

  2 - Video will be save in DB (firebase in this case) and showed on feed like in youtube.

  3 - User2 clicks on user1 video button “join kitten”

  4 - User2 is now on camera screen to record a video to merge with user1’s video.

  5 - user2 video will recorded to the length of user1’s video

  6 - the merge will keep audio of user1’s video

  7 - result video gets watermark

  8 - merged video will be saved in DB(or locally) and displayed in another feed.

  I’m very new to each native and I don’t code frequently.
  I found this code on GitHub, but I’m having issues to use the module but gives me error when trying to install it.
  The closest example that I found was this app

  With ffmpeg would more or less do a part of it or maybe it all, but I’m not familiar with it and I would know how to implement this in react native

  ffmpeg -i input1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts temp1 2> /dev/null & \

  ffmpeg -i input2.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts temp2 2> /dev/null &

  ffmpeg -f mpegts -i "concat:temp1|temp2" -c copy -bsf:a aac_adtstoasc output.mp4

• React Native and FFMPEG render text differently (Help me)

  6 février 2021, par Douglas Gondim

  I'm creating a video editing app in React Native that allows you to burn subtitles onto any video. I'm facing a problem that the font size on the phone screen doesn't match the font size after the video is rendered.

  


  I can guarantee that the text is being scaled down appropriately on the app side because the video obviously looks smaller on the phone screen than its original size. So the text that I'm placing on top of the video as a preview needs to be scaled down accordingly.

  


  The problem is each different font seems to have a different scale factor when I render the video. So the previewer is ALWAYS off. My solution was to manually scale up/down each font in regards to its approximate width and height factor. But that's a very poor solution.

  


  I assume it has something to do with something called a font.config file that you can set on ffmpeg.

  


  How can I make eg. Arial, 14 in React Native be rendered the same way as Arial, 14 on ffmpeg ? I really need help with that. I don't even know where to look.