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A Comprehensive Guide to Encoding H.264 Video with MP4 Container Using Controllable Frame Rate and Bitrate in libavcodec

Introduction

If you're working with multimedia applications or video production, you may often find yourself in a situation where you need to encode video with specific settings like H.264 codec, MP4 container, and controllable frame rate and bitrate. libavcodec, a vital component of the FFmpeg multimedia framework, can help you achieve this. In this guide, we will walk you through the steps to encode video with these requirements and introduce you to the concept of presets to control encoding quality.



Encoding with libavcodec

libavcodec is a powerful library for encoding and decoding audio and video streams. To encode video with H.264 codec and MP4 container while controlling the frame rate and bitrate, you can use the following.
 

Set Encoding Options: To control the encoding quality, you can set the encoding options using the AVDictionary structure. In this case, we'll focus on the 'preset' option, which defines the encoding speed and quality. 

The available presets are as follows:

  • ultrafast
  • superfast
  • veryfast
  • faster
  • fast
  • medium
  • slow
  • slower
  • veryslow
  • placebo, 0


AVDictionary* options = NULL;
av_dict_set(&options, "preset", "veryslow", 0);

Select the preset that suits your encoding needs. Keep in mind that selecting a faster preset may result in faster encoding but lower video quality, while slower presets will improve video quality at the cost of longer encoding times.

Conclusion

libavcodec is a versatile library that allows you to encode video with H.264 codec and MP4 container while controlling the frame rate and bitrate. By selecting an appropriate preset, you can balance between encoding speed and video quality. 


link: Stackoverflow.com

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