Howdy, I'm trying to encode audio on an iPhone and then send it out over http.
The video aspect works fine. My problem is with audio. If I choose PCM as the codec then everything works fine. However if I switch to MP3 then the audio plays too fast. An example of each file can be found at http://inodes.org/johnf/iphone_pcm.flv and http://inodes.org/johnf/iphone_mp3.flv Is there anything extra I need to do when encoding audio to FLV? The only difference between the two files above is choosing a different audio codec for the output. The relevant bits of code look like. codec->codec_type = AVMEDIA_TYPE_AUDIO; codec->sample_fmt = SAMPLE_FMT_S16; codec->sample_rate = 22050; codec->channels = 1; codec->bit_rate = 64000; uint8_t *data; /* Buffer for encoded data */ int16_t *samples; /* This holds the samples coming from CoreAudio */ uint32_t size; // Size of the samples buffer long sample_time; // time in ms since start from CoreAudio packet.size = avcodec_encode_audio(codec, data, size, samples); if (codec->coded_frame && codec->coded_frame->pts != AV_NOPTS_VALUE) { packet.pts = av_rescale_q(sample_time, codec->time_base, audio_stream->time_base); // Have also tried with no difference //packet.pts = sample_time; } packet.flags |= AV_PKT_FLAG_KEY; packet.stream_index = audio_stream->index; packet.data = data; av_interleaved_write_frame(output_context, &packet); Cheers, John -- John Blog http://www.inodes.org LCA2011 http://www.lca2011.org.au _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
