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• avutil/mem : Handle fast allocations near UINT_MAX properly

  5 juillet 2022, par Andreas Rheinhardt

  avutil/mem : Handle fast allocations near UINT_MAX properly
  av_fast_realloc and av_fast_mallocz ? store the size of
  
  the objects they allocate in an unsigned. Yet they overallocate
  
  and currently they can allocate more than UINT_MAX bytes
  
  in case a user has requested a size of about UINT_MAX * 16 / 17
  
  or more if SIZE_MAX > UINT_MAX (and if the user increased
  
  max_alloc_size via av_max_alloc). In this case it is impossible
  
  to store the true size of the buffer via the unsigned* ;
  
  future requests are likely to use the (re)allocation codepath
  
  even if the buffer is actually large enough because of
  
  the incorrect size.
  Fix this by ensuring that the actually allocated size
  
  always fits into an unsigned. (This entails erroring out
  
  in case the user requested more than UINT_MAX.)
  Reviewed-by : Tomas Härdin <tjoppen@acc.umu.se>
  
  Reviewed-by : Anton Khirnov <anton@khirnov.net>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavutil/mem.c

• How to get video info using ffmpeg ?

  28 décembre 2022, par Jason wick

  I want that when user uplaods a video it should be passed through various checkpoints like resolution, frame rate, bit rate and FOV . So i want to know how can i get all these information about video using ffmpeg in php and store it in array to use it ?

  


• Rebuilding Website for sharing videos

  22 novembre 2015, par Léo Le Gall

  Some friends and I run a sport forum with a decent user base. A lot of users wanted the ability to share video clips of their tricks. We didn’t really think anyone would use a video website that we made, so I built a really simple one just to see if the users would really use it. I hosted the video site on a $10 VPS, and it got blown away. The site was literally garbage, it was not visually appealing and the performance was just sad. Just as expected really, since this was just a test site. Since our test project was a success, we want to create a new and more polished site for the videos.

  The website is really simple, and probably not optimized in any way at the moment. I will try to explain in details what the website does. The user uploads some video files in format X, the website combines them and converts (using ffmpeg) the final video to mp4(so it can be served with a html5 video player). The users gets a link (example.com/randomvideo) where he can see the video through a html5 player serving the mp4 file(just default html5, nothing fancy). The videos only contains highlights, and the final video is always under 1 minute, most are around 30 seconds.

  Currently everything happens on the same server, both the video processing and the video serving. I can try to show how it works :

  1. User uploads some videos
  2. Servers stores the videos in a new random folder
  3. Combine videos and convert to mp4 (ffmpeg)
  4. Move final video(random name) to directory containing processed videos
  5. Store the name of the video file in the database (for website to serve it)
  6. Delete directory used to process the videos

  I want to rebuild the website’s architecture to make it able to scale and handle heavy load. I have never done this before and I am currently making a plan how to do this. My plan is at the moment :

  1. Seperate servers for processing videos and viewing videos (all VPS in the start)
  2. Utilize content delivery network for serving static files
  3. Utilize load balancers both for servers proccesing and serving

  I don’t really know what I should do with database(s). Can I do with one database or should use more ? They do not need to store sensitive information, since the auth in done through an API. They only need store information about the videos. I have experience with postgresql, mysql and redis, but I am not limited to those. What would you recommend in terms of scaleability ?

  I will appriciate all the feedback I can get regarding my plan and what to do about databases. I know this might be a bit vague, so please ask me if I have forgotten anything imporant. Thanks for reading.