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[libav-user] Encoding PCM audio with avcodec_encode_audio
https://libav-user.ffmpeg.narkive.com/bb4elg6G/encoding-pcm-audio-with-avcodec-encode-audio
BYTE* pBuffer; // PCM input, received by DirectShow long BufferLen; // length of buffer, it is 88200 bytes..... // this is adapted from output_example.c AVCodecContext *c; AVPacket pkt; av_init_packet(&pkt); c = st->codec; audio_input_frame_size = BufferLen / 2; pkt.size= avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);.....
c - Encode audio to aac with libavcodec - Stack Overflow
https://stackoverflow.com/questions/2410459/encode-audio-to-aac-with-libavcodec
I'm using libavcodec (latest git as of 3/3/10) to encode raw pcm to aac (libfaac support enabled). I do this by calling avcodec_encode_audio repeatedly with codec_context->frame_size samples each time. The first four calls return successfully, but the fifth call never returns. When I use gdb to break, the stack is corrupt.
how to encode raw audio into mp2 or mp3 formats - C / C++
https://bytes.com/topic/c/answers/693975-how-encode-raw-audio-into-mp2-mp3-formats
This is presumable what it thinks it can fit into a single audio frame from the MPEG2 specification part 3. The outbuf is the buffer where the encode MPEG2 audio data is written, its size appears to be arbitrary but large. When avcodec_encode_audio is called it returns the amount of data it has written into outbuf so that it can be saved to disk.
Why does avcodec_fill_audio_frame return -22 when only ...
https://www.examplefiles.net/cs/1596763
In some cases this depends on the codec (e.g. mp3 frame size is constant), but in other cases it can be variable. It should still be constant in an encoding for most encoders. It looks like your value is just whatever the default was and mulaw has no built-in constant, so you can just specify a different frame_size value before calling avcodec_open2() and you should be OK.
simplest_ffmpeg_audio_encoder/simplest_ffmpeg_audio ...
https://github.com/leixiaohua1020/simplest_ffmpeg_audio_encoder/blob/master/simplest_ffmpeg_audio_encoder/simplest_ffmpeg_audio_encoder.cpp
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