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• Scaling overlay to match the background video's width while maintaining aspect ratio

  29 mars 2023, par roku

  I'm trying to achive the effect described in the title. But I can't really figure it out. I made a command which almost does what I want it to do but the overlay is still bigger than the background for some reason beyond my understanding.

  


  For more context, the background video has an aspect ratio of 9:16 and the overlay video is always exactly 950 pixels wide.

  


  Here is my command :

  


  ffmpeg -i gameplay.mp4 -i merged.mp4 -i merged.wav -filter_complex "[0:v]crop=ih*(9/16):ih[backgr];[1:v]scale=-2:-2[ovrl];[backgr][ovrl]overlay=(W-w)/2:(H-h)/2[outv]" -map [outv] -map 2:a -shortest test.mp4


  


  Any help is welcome !

  


• HEVC : Fetching the input width and height from input bin stream

  3 septembre 2014, par Zax

  I have created an elementary bin stream using HM-12.0 reference code. So the out put is an HEVC encoded bin stream (say input.bin).

  I have a task which involves reading the header of this elementary stream. That is i need to fetch information such a the stream width, height etc. from the input.bin file.

  After seeing a lots of streams, i can conclude that all these bin streams starts from the sequence :

  00 00 00 01

  So whenever i see this sequence in any bin stream, i can say that this stream has to be decoded by HEVC decoder.

  Further if i want to fetch the width, height, fps etc. from the input.bin (like ff_raw_video_read_header function in ffmpeg), that are the steps need to be performed to fetch this information ?

  I have gone through the parsing section of the HEVC draft, but its very complicated for my level in video domain. Can anyone suggest a simple way to fetch the required information from the encoded bin file ?

  Any suggestions will be really helpful to me. Thanks in advance.

• HEVC : Fetching the input width and height from input bin stream

  1er juillet 2022, par Zax

  I have created an elementary bin stream using HM-12.0 reference code. So the out put is an HEVC encoded bin stream (say input.bin).

  



  I have a task which involves reading the header of this elementary stream. That is i need to fetch information such a the stream width, height etc. from the input.bin file.

  



  After seeing a lots of streams, i can conclude that all these bin streams starts from the sequence :

  



  00 00 00 01


  



  So whenever i see this sequence in any bin stream, i can say that this stream has to be decoded by HEVC decoder.

  



  Further if i want to fetch the width, height, fps etc. from the input.bin (like ff_raw_video_read_header function in ffmpeg), that are the steps need to be performed to fetch this information ?

  



  I have gone through the parsing section of the HEVC draft, but its very complicated for my level in video domain. Can anyone suggest a simple way to fetch the required information from the encoded bin file ?

  



  Any suggestions will be really helpful to me. Thanks in advance.