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• implement xmp data inside the jpeg itself using ffmpeg

  8 janvier 2020, par Nadav Rosenberg

  Is there any way to take jpeg file and xmp file and combine them to one jpeg file that include all the metadata from the xmp file (created date, camera manufacturer, geolocation ...) ?
  Also, I want to do the same with mp4 videos.

  I want to use ffmpeg app from android because it’s something that I will do a lot but if there is any other easy option I do not mind.

  thank you !

• How do I use Ff-mpeg, Grabbing .PNG from RTMP stream ?

  22 février 2016, par Lewis Day

  I have recently installed Ff-mpeg onto my vps and have looked online for possible solutions to my problem I was having, I’m wondering how I can grab individual frames from a rtmp stream and display them as an image. I know this has previously been asked before here ; but my question is how can I use this code ?

  For example the answer on that question was marked as this ;

  ffmpeg -an -flv_metadata 1 -analyzeduration 1 ...

  How would I use this on a .php file ? I mean this doesnt even ask for the rtmp ip ?

• how is time_base diffrent then framerate in ffmpeg ? [duplicate]

  29 juin 2019, par Gilgamesh22

  This question already has an answer here :

  • What is video timescale, timebase, or timestamp in ffmpeg ? [closed]
    
    1 answer
    

  I have a project in which I receive frames sequentially to encode a mp4-h264 video. I also receive the timestamp in milliseconds along side the frame to indicate where in the video to place the frame. Because of this I decided to have a time_base of 10000 to simplify the placement of the frame since the frame rate is variable with an average fps of 30. I later learned that this causes problems in some video players. I was wondering if there is a proper way to accomplish this. at the moment my current solution is to set the time_base to 30 and simply set the frame->pts to timestamp of the frame divide by (10000/30).

  Original Setup

      AVCodecContext *cctx;
  
      AVStream* stream;
  
  
  
      stream->time_base.num = 1;
  
      stream->time_base.den = 10000;
  
  
  
      stream->r_frame_rate.num = 30;
  
      stream->r_frame_rate.den = 1;
  
  
  
      cctx->time_base.num = 1;
  
      cctx->time_base.den = 10000;
  
  
  
      cctx->framerate.num = 30;
  
      cctx->framerate.den = 1;

  My Question

  what exactly is time_base because I always though time_base was simply used to extract location of the frame and was abstracted away during the encoding process. this is why i though you have to declare both a framerate and time_base. If it is simply a ffmpg abstraction why is a time_base with large gaps of missing frames cause this problem in only some players. does the time base and frame rate need to match