[FFmpeg-user] Can't select appropriate encoder

[alex jamshedi]

Hi,

I am piping a buffer to ffmpeg in my c code. I am using ffmpeg version
3.2.10-1~deb9u1+rpt1 on the raspberry pi. Ffmpeg is giving me issues with
the following line.

pipeout = popen("ffmpeg -y -f s32be -ar 131072 -ac 1 -i -c:a pmc_s32be
hydro.wav, "w");

When I run the code, ffmpeg does not like the "-c:a pmc_s32e" part. I get
an error stating: "-c:a Protocol not found. Did you mean file:-c:a?". When
I change my code to "file:-c:a" I then get the error: "file:-c:a: No such
file or directory".

The reason I need this piece is because ffmpeg defaults to outputting
pcm_s16le audio when I need pcm_s32be.

I have tried "-c:a copy" as well. No luck.

Any help would be appreciated.

Thanks.
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[FFmpeg-user] piping raw audio data from c buffer

[alex jamshedi]

Hi,

I have written C code that subscribes to a UDP multicast group, and stores
the raw (hex) incoming audio data into a buffer.

I was wondering if there is a way of piping this buffer with the raw audio
data to ffmpeg within the C code in order to play the audio. I have seen
examples of .wav files being piped to ffmpeg within C files, but not a
buffer.

I am not experienced with ffmpeg and any help/tips would be greatly
appreciated.

Thank you.
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[FFmpeg-user] down sampling

[alex jamshedi]

Hi,

Hopefully this is an appropriate question for the forums.

My goal is to receive a live audio stream that is being sampled at 131,072
Hz and re-sample it at 44.1 kHz before outputting it through my computers
speakers. Is this a task ffmpeg can perform?

Thank you.
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