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how to get frames per second value from video file using ffmpeg c++

 To get the frames per second (FPS) value from a video file using FFmpeg and C++, you can follow these steps:

  1. Include the required FFmpeg header files in your C++ source code:
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>

  1. Open the input video file using the avformat_open_input() function:
AVFormatContext *format_context = nullptr; int error = avformat_open_input(&format_context, input_filename, nullptr, nullptr); if (error < 0) { // Handle error }

  1. Find the stream information in the input file using the avformat_find_stream_info() function:
error = avformat_find_stream_info(format_context, nullptr); if (error < 0) { // Handle error }

  1. Find the video stream in the input file using the av_find_best_stream() function:
int video_stream_index = av_find_best_stream(format_context, AVMEDIA_TYPE_VIDEO, -1, -1, nullptr, 0); if (video_stream_index < 0) { // Handle error }

  1. Get the FPS value from the video stream's codec context using the av_q2d() function:
AVStream *video_stream = format_context->streams[video_stream_index]; AVCodecContext *codec_context = video_stream->codec; double fps = av_q2d(codec_context->framerate);

  1. Close the input file and release the format context using the avformat_close_input() function:
avformat_close_input(&format_context);


Similar way of identifying the fps, refer the many upvoted stackoverflow answer

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