Код: Выделить всё
av_register_all();
avcodec_register_all();
av_log_set_callback(nullptr);
av_format_context_ = avformat_alloc_context();
if (!av_format_context_)
{
std::string error_msg = "Failed to allocate avformat context";
log_->Error(error_msg);
throw std::runtime_error(error_msg.c_str());
}
av_format_context_->oformat = av_guess_format("mp4", filename.c_str(), NULL);
strcpy(av_format_context_->filename, filename.c_str());
AVCodec* codec = avcodec_find_encoder(AV_CODEC_ID_PCM_MULAW);
av_format_context_->oformat->audio_codec = codec->id;
audio_stream_ = avformat_new_stream(av_format_context_, codec);
if (audio_stream_ == nullptr)
{
log_->Error("Can not create audiostream.");
return false;
}
AVCodecContext& codec_context = *audio_stream_->codec;
if (avcodec_copy_context(audio_stream_->codec, av_format_context_->streams[1]->codec) != 0)
{
log_->Error("Failed to Copy Context");
return false;
}
audio_stream_->time_base = { 1, codec_context.sample_rate };
if (av_format_context_->oformat->flags & AVFMT_GLOBALHEADER)
codec_context.flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
log_->Info("Init output {}", filename);
av_dump_format(av_format_context_, 0, filename.c_str(), 1);
int ret = avio_open(&av_format_context_->pb, filename.c_str(), AVIO_FLAG_WRITE);
if (ret < 0)
{
log_->Error("Can not open file for writing.");
return false;
}
ret = avformat_write_header(av_format_context_, NULL);
if (ret < 0)
{
log_->Error("Can not write header.");
return false;
}
Подробнее здесь: https://stackoverflow.com/questions/792 ... h-g711u-au