[FFmpeg-user] MP4s (and M4As) for music

[Paul B Mahol]

On Sun, Jun 8, 2025 at 5:42 PM Mark Filipak <
markfilipak.imdb-at-gmail.com at ffmpeg.org> wrote:

> ffmpeg^
>   -i "c:\chapters.txt"^
>   -i c:\01.WAV^
>   -i c:\02.WAV^
>   -i c:\03.WAV^
>   -i c:\04.WAV^
>   -i c:\05.WAV^
>   -i c:\06.WAV^
>   -i c:\07.WAV^
>   -i c:\08.WAV^
>   -filter_complex
> "[1:0][2:0][3:0][4:0][5:0][6:0][7:0][8:0]concat=n=8:v=0:a=1[out]"^
>   -map_metadata 0 -map "[out]"^
>   -c aac -b:a 657.6k^
>   "c:\Ashra, Belle Alliance [1980].m4a"
>
>
> *****
> The script above provoked this: "Too many bits 15269.442177 > 12288 per
> frame requested, clamping to
> max". Of course, I have no idea what that's about. Do you? "Too many bits"?
> *****
>
> How did FFmpeg (or AAC) compute "15269.442177 > 12288". What are those
> numbers? Why does the
> complaint say "bits ... per frame requested" when there's _no_video_,
> _no_frames_?
>

https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/aacenc.c#L1243


>
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
>