FFMPEG：视频的bit_rate的动态变化 [英] FFMPEG: Dynamic change of bit_rate for Video

问题描述

我在C ++应用程序中使用ffmpeg代码，并希望控制那里的VIDEO的bit_rate参数。我试图改变其工作价值（通过ost-> st-> codec-> codec-> bit_rate），但是ffmpeg不希望改变它。
也许有人知道怎么做？

任何想法？

解决方案

为我工作。

  avcodec_init（）; 
 
 avcodec_register_all（）; 
 
 codec = avcodec_find_encoder（CODEC_ID_H263）; 
 
 c = avcodec_alloc_context（）; 
 
 picture = avcodec_alloc_frame（）; 
 
 c-> bit_rate = bitrate; 
 c-> width = w; 
 c-> height = h; 
 c-> time_base =（AVRational）{1，framerate}; 
 c-> pix_fmt = PIX_FMT_YUV420P; 
 
 avcodec_close（c）; 
 
 av_free（c）; 
  

I use ffmpeg codes in my C++ app and would like to control the bit_rate parameter for VIDEO there. I tried to change its value in work (via ost->st->codec->codec->bit_rate), but ffmpeg did not wish to change it. Perhaps anybody knows how to make it?

Any ideas?

解决方案

I have tried like this and its working for me.

     avcodec_init();

     avcodec_register_all();

     codec = avcodec_find_encoder(CODEC_ID_H263);

     c = avcodec_alloc_context();

     picture= avcodec_alloc_frame();

        c->bit_rate = bitrate;
        c->width = w;
        c->height = h;
        c->time_base= (AVRational){1,framerate};
        c->pix_fmt = PIX_FMT_YUV420P;

avcodec_close(c);

av_free(c);

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