FFmpeg's beginner notes

1. Unable to find a suitable output format for error:

Because no call

Av_register_all ();

Check whether other initialization functions are not called.

2.

Avcodec_encode_audio (audiostream-> codec,
Audiobuffer, audio_buffer_size, frame. Data. bytes); there is no input parameter to describe the length of the original frame, which means that the length of the original audio frame is fixed by default when FFmpeg is encoding the audio.

Audiostream-> codec-> frame_size.

The size of the input buffer area data is determined

Audiostream-> codec-> frame_size * bytes per channel * Channels

FFmpeg Audio Encoding requires the length of the above frame to be encoded.