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Encode/AAC – FFmpeg
https://trac.ffmpeg.org/wiki/Encode/AAC
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 128kbps. q
Converting Audio to AAC using ffmpeg - Super User
https://superuser.com/questions/684955/converting-audio-to-aac-using-ffmpeg
ffmpeg -i input.mp3 -strict experimental -c:a aac -b:a 128k output.aac. When converting to .aac from a source in m4a/mp4, you don't even need to re-encode: ffmpeg -i input.m4a -c:a copy output.aac. Note: FFmpeg tries to …
Audio Transcoding using FFmpeg - Change Audio Codecs using ...
https://ottverse.com/transcode-audio-codec-ffmpeg-without-changing-video/
ffmpeg -i input_filename.avi -acodec mp3 -vcodec copy output_filename.avi Here, you are instructing FFmpeg to. read the input file named input_filename.avi that is in an avi media container that holds both the audio and video. copy the video content as is using the -vcodec copy parameter (no video re-encoding), use mp3 audio codec to re-encode the audio
c++ - Decoding AAC audio with ffmpeg - Stack Overflow
https://stackoverflow.com/questions/65744845/decoding-aac-audio-with-ffmpeg
I setup the extra data bytes for the ffmpeg decoder and decode the frame successfully? as follows: (pseudo c++ code) setup the decoder: avcodec_find_decoder(codec_id); avcodec_alloc_context3(context->codec); avcodec_open2(context->av_codec_context, context->codec, nullptr); av_init_packet(&context->av_raw_packet); setup the extra data bytes:
#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
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