> I am trying to write a C program that demuxes audio from an MP4 file and
> write demuxed AVPacket data to a file. But the resulting dump is missing ADTS
> headers. Any pointers on what is the best way to add ADTS headers.
> I see that ffmpeg has 'adtsenc.c' file that seems to implement an ADTS muxer:
AVOutputFormat ff_adts_muxer = {
.name = "adts",
.long_name = NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio
Coding)"),
.mime_type = "audio/aac",
.extensions = "aac,adts",
.priv_data_size = sizeof(ADTSContext),
.audio_codec = AV_CODEC_ID_AAC,
.video_codec = AV_CODEC_ID_NONE,
.write_header = adts_write_header,
.write_packet = adts_write_packet,
.write_trailer = adts_write_trailer,
.priv_class = &adts_muxer_class,
.flags = AVFMT_NOTIMESTAMPS,
};
> Can I use this muxer for my purpose? If yes, any links on how to use it?
> Thanks in advance,
> Malik
Malik – Yes, use the adtsenc encoder to add ADTS headers to AAC encoded audio.
(if that’s the output media)
See https://ffmpeg.org/doxygen/2.6/transcode_aac_8c-example.html
For the output format, you can do
avformat_alloc_output_context2(&m_format_context, NULL, "adts", NULL)
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