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Encode/AAC - FFmpeg
https://trac.ffmpeg.org/wiki/Encode/AAC
ffmpeg - How to encode audio in AAC-LC, AAC-HE-V1, …
https://stackoverflow.com/questions/18894810/how-to-encode-audio-in-aac-lc-aac-he-v1-aac-he-v2-using-libavcodec
I will explain how you can do it using libfdk_aac: first make sure you configure ffmpeg along with following options:--enable-libfdk_aac --enable-nonfree now build ffmpeg and try to run the following command and see if it works: ffmpeg -i <input file> -vcodec copy -acodec libfdk_aac -profile:a aac_he <output file>
FFmpeg Codecs Documentation
https://ffmpeg.org/ffmpeg-codecs.html
A description of some of the currently available audio encoders follows. 8.1 aac. Advanced Audio Coding (AAC) encoder. This encoder is the default AAC encoder, natively implemented into FFmpeg. 8.1.1 Options b. Set bit rate in bits/s. Setting this automatically activates constant bit rate (CBR) mode. If this option is unspecified it is set to ...
ffmpeg - Variable bitrate for AAC - how to reach it ...
https://video.stackexchange.com/questions/29116/variable-bitrate-for-aac-how-to-reach-it
Audio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 1 min 26 s Bit rate mode : Variable Bit rate : 75.3 kb/s Maximum bit rate : 142 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 24.0 kHz Frame rate : 23.438 FPS (1024 SPF) Compression mode : Lossy Stream size : 778 KiB (9%) Language : …
#8624 (Codec Copy Reencodes AAC VBR Audio) – FFmpeg
https://trac.ffmpeg.org/ticket/8624
The original .ts file has a VBR audio. When copying into .mp4, it reencodes the audio into CBR and byte comparison for the audio track does not match with original AAC that comes from the .ts file. How to reproduce: % ffmpeg -i .\sample_media.ts -c:v copy -c:a copy .\vacopy.mp4 ffmpeg git-2020-04-17-889ad93 built on gcc 9.3.1 (GCC) 20200328
c - Decode AAC with FFmpeg in RTP packet - Stack …
https://stackoverflow.com/questions/31936622/decode-aac-with-ffmpeg-in-rtp-packet
I ended up using codec AV_CODEC_ID_AAC instead of AV_CODEC_ID_AAC_LATM. After digging into rfc and ISO document, I figured out that the packet is format in LATM but the input packet for AAC Decoder have to be formatted in ADTS, so a bit of parser have to be written here. I can't post the code but it's not too hard to write one.
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