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• 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.

  


• Set RTSP/UDP buffer size in FFmpeg

  16 mars 2015, par chuckleplant

  Note : I’m aware ffmpeg and libav are different libraries. This is a problem common to both.

  Disclaimer : Duplicate of SO question marked as answered but actually didn’t give a proper solution.

  ---

  Insufficient UDP buffer size causes broken streams for several high resolution video streams. In LibAV/FFMPEG it’s possible to set the udp buffer size for udp urls (udp ://...) by appending some options to it.

  However, for RTSP urls this is not supported. These are the only solutions I’ve found :

  • Rebuilding ffmpeg/libav changing the UDP_MAX_PKT_SIZE in the udp.c source file.
  • Using a nasty hack to find the required value.
  • Using a different decoding library (proposed solution to aforementioned related SO question).

  None of these is actually a solution. From what I found it should be possible to use the API’s AVOptions to find and set this value. Or else, the AVDictionary.

  It’s very difficult to find how to set these throughout the documentation of either libav or ffmpeg.

• Server side video merging with FFmpeg through oline form

  1er août 2017, par San007

  I have a difficult problem and not enough knowledge to solve it, therefore I am hoping you guys can give me some advice or redirect me to a professional or professional software which can solve my problem.

  I want something fairly simple but I simply do not know how to begin. I Googled extensively but didnt find any related topics.

  What do I want ?
  I want an online form on my website where people can select different options, which are videos, for example
  Question 1
  1 (1.mp4) / 2 (2.mp4) / 3 (3.mp4)
  Question 2
  X (X.mp4) / Y (Y.mp4) / Z (Z.mp4)
  Question 3
  Email adres :
  Generate

  When the visitor clicks the generator button it should merge the video’s the customer has selected. e.g. 1 and X will result in one video file of 1.mp4 and X.mp4 merged. The system should then after succesfully merging the videos send a download link to the users e-mail adres and ideally delete the video from the server afterwards.

  I know I have not done a whole lot of research because my knowledge simply is not enough to create my own solution, but I hope you guys can send me in the right direction, I do not mind any commercial solution.