I am currently learning about Abstract Data Types (ADTs), but I do not get the concept at all. Could someone please explain to me what this actually is? Also, what are collection, bag, and List ADT...
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 ...
ADTs are also the base for "abstract test suites", following Meyer 's idea that "an object/module/ (sub-)system is defined by what you can do with it".
ADTS header is typicaly not used in some other container, like mp4, but is used for standalone AAC files only. ADTS header starts with 12 bit syncword 1111 1111 1111.
That's pretty strange. .aac is just raw aac frames with adts header. Ffmpeg should be able to handle it. Try -f raw or -r adts.
After a lot of searching I've found two ways to add the ADTS header to audio in order to properly MUX an MPEG-TS. The first was to set up a separate AVFormatContext for ADTS, create an AVStream with the the encoded AAC packets and then use send_frame / receive_frame to get the same AAC data but this time with the ADTS header applied. That added a lot of complexity and latency. In the end, I ...
ADTS sample rates and channel counts are for HE-AAC and HE-AACv2 to try to maintain compatibility with LC only decoders. The good news is that it they are inaccurate in a precise manner.