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Using FFMPEG to convert audio and video formats
https://cloudinfrastack.com/cz/blog/others/using_ffmpeg_to_convert_audio_and_video_formats/#:~:text=ffmpeg%20-i%20video.ts%20-vcodec%20libx264%20-b%3Av%201000k%20-codec%3Aa,audio%20codec%20with%20a%20bitrate%20of%20128%20Kbit%2Fs.
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
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:
FFmpeg
December 5th, 2015, The native FFmpeg AAC encoder is now stable! After seven years the native FFmpeg AAC encoder has had its experimental flag removed and declared as ready for general use. The encoder is transparent at 128kbps for most samples tested with artifacts only appearing in extreme cases.
#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.
[FFmpeg-cvslog] avformat/matroskaenc: Move AAC extradata ...
[FFmpeg-cvslog] avformat/matroskaenc: Move AAC extradata check to other audio checks. Andreas Rheinhardt Sat, 08 Jan 2022 09:42:39 -0800
Using FFMPEG to convert audio and video formats
https://cloudinfrastack.com/cz/blog/others/using_ffmpeg_to_convert_audio_and_video_formats/
ffmpeg -i video.ts -vcodec libx264 -b:v 1000k -codec:a aac -b:a 128k -s 1280x720 video.mp4 This particular command sets the video codec as libx264 or H264, it sets the video bitrate to 1000 Kbit/s per second, furthermore it sets aac as the audio codec with a …
FFmpeg list all codecs, encoders, decoders and formats – write
https://write.corbpie.com/ffmpeg-list-all-codecs-encoders-decoders-and-formats/
To list all codecs in FFmpeg simply do ffmpeg -codecs The guide for the returned codecs is: D..... = Decoding supported .E.... = Encoding supported ..V... = Video codec ..A... = Audio codec ..S... = Subtitle codec ...I.. = Intra frame-only codec ....L. = Lossy compression .....S = Lossless compression
Encode/HighQualityAudio - FFmpeg
https://trac.ffmpeg.org/wiki/Encode/HighQualityAudio
The highest quality internal/native encoder available in FFmpeg without any external libraries is aac. Please note it is not recommended to use the experimental vorbis for Vorbis encoding; use libvorbis instead. Please note that wmav1 and wmav2 don't seem to be able to reach transparency at any given bitrate. Container formats
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