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

[Paul B Mahol]

On Sun, Jun 8, 2025 at 6:18 PM Mark Filipak <
markfilipak.imdb-at-gmail.com at ffmpeg.org> wrote:

> On 08/06/2025 13.51, Paul B Mahol wrote:
> > 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
>
> Thank you, but I can't read that. Is there documentation in English?
>
> Can you tell me why FFmpeg (or AAC) says "15269.442177" when I submitted
> "-b:a 657.6k"?
>
>
Because its bad encoder, failed to keep promise within its limits.


> _______________________________________________
> 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".
>