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FFmpeg Codecs Documentation
https://ffmpeg.org/ffmpeg-codecs.html#:~:text=Options%20may%20be%20set%20by%20specifying%20-%20option,bitrate%20%28in%20bits%2Fs%29.%20Default%20value%20is%20128K.%20
bitrate - How to force Constant Bit Rate using FFMPEG ...
https://stackoverflow.com/questions/10908796/how-to-force-constant-bit-rate-using-ffmpeg
ffmpeg -i input -b 1200k -minrate 1200k -maxrate 1200k -bufsize 1200k -ab 64k -vcodec libx264 -acodec aac -strict -2 -ac 2 -ar 44100 -s 320x240 -y output.mp4 Had to use aac instead of libfaac, which requires "-strict -2".
ffmpeg - How to specify audio and video bitrate - Super User
https://superuser.com/questions/319542/how-to-specify-audio-and-video-bitrate
In order to specify the target bitrate for video and audio, use the -b:v and -b:a options, respectively. You can use abbreviations like K for kBit/s and M for MBit/s. For example: ffmpeg -i input.mp4 -b:v 1M -b:a 192k output.avi Note: This is a simple one-pass encode that tries to reach the specified bitrate at the end.
Limiting the output bitrate – FFmpeg
https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate
ffmpeg -i input -c:v libx264 -b:v 2M -maxrate 2M -bufsize 1M output.mp4. The key option here is -bufsize which tells the encoder how often to calculate the average bit rate and check to see if it conforms to the average bit rate specified on the command line ( -b:v 2M ).
Forcing a bitrate with FFMPEG - VideoHelp Forum
https://forum.videohelp.com/threads/317513-Forcing-a-bitrate-with-FFMPEG
I'm having an issue with FFMPEG. I'm trying to force a lowish bitrate while converting an uncompressed AVI into an FLV. Obviously I want the FLV to be as small as possible for the web. Here is my command string: Code: ffmpeg -i test.avi -b 50k -qmax 5 -r 25 -s 440x360 -ab 56k -ar 22050 -acodec libmp3lame -f flv test.flv.
FFmpeg Codecs Documentation
https://ffmpeg.org/ffmpeg-codecs.html
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. Set quality for variable bit rate (VBR) mode. This option is valid only using the ffmpeg command-line tool.
music - Changing sample format and bit depth on audio ...
https://askubuntu.com/questions/1306318/changing-sample-format-and-bit-depth-on-audio-files-with-ffmpeg
Or manually set the audio sample format. With the -sample_fmt option. ffmpeg -i input.wav -sample_fmt s16 -ar 44100 output.wav See a list of audio sample formats (bit depth) with ffmpeg -sample_fmts; Or use the aformat filter ffmpeg -i input.wav -af "aformat=sample_fmts=s16:sample_rates=44100" output.wav
How to force very low bitrate with h.265 and VP9 : ffmpeg
https://www.reddit.com/r/ffmpeg/comments/l9pby1/how_to_force_very_low_bitrate_with_h265_and_vp9/
Ben_Copper. · 6m · edited 6m. you can try : libx265 / h.265 : ffmpeg -i input.mp4 -c:v libx265 -b:v 300K -minrate 100K -maxrate 400K -c:a aac -b:a 192K output1.mp4. -minrate is useless because it don't work. -b:v for average bitrate ( video) Vp9 : when using vp9 codec minrate , maxrate option work in 2-pass encode.
How to set audio bitrate in ffmpeg? - LinuxQuestions.org
https://www.linuxquestions.org/questions/linux-newbie-8/how-to-set-audio-bitrate-in-ffmpeg-4175675978/
ffmpeg is right to tell you that 16 bit per second is way too low to get any sort of usable audio from it. Did you listen to the result? Actually, mddnix 's …
FFmpeg H.264 Constant Bitrate (CBR) Encoding | Broken ¦ Pipe
https://brokenpipe.wordpress.com/2016/10/07/ffmpeg-h-264-constant-bitrate-cbr-encoding-for-iptv/
ffmpeg -i <input> -r 25 -c:v libx264 -x264opts nal-hrd=cbr:force-cfr=1 -b:v 2500k -minrate 2500k -maxrate 2500k -bufsize 100k output.ts. where: nal-hrd=cbr. set the hypothetical reference decoder (HRD) to CBR and pack the bitstream to the specified bitrate. force-cfr=1.
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