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

[Paul B Mahol]

On Sun, Jun 8, 2025 at 6:31 PM Mark Filipak <
markfilipak.imdb-at-gmail.com at ffmpeg.org> wrote:

> On 08/06/2025 14.26, Paul B Mahol wrote:
> > 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.
>
> Do you ever encode music, Paul? If so, what do you use?
>
>
FLAC only.


>
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