[FFmpeg-devel] [PATCH] Description of avcodec_encode_audio()

Michael Niedermayer michaelni
Thu Apr 2 22:32:10 CEST 2009

On Thu, Apr 02, 2009 at 09:15:29PM +0100, John Fletcher wrote:
> > "pcm" there is nothing pcm specific
> > 
> It is different for PCM because in that case buf_size
> determines the number of samples to be encoded, as explained
> in the current description of the function:
>  * @param[in] samples the input buffer containing the samples
>  * The number of samples read from this buffer is frame_size*channels,
>  * both of which are defined in \p avctx.
>  * For PCM audio the number of samples read from \p samples is equal to
>  * \p buf_size * input_sample_size / output_sample_size.
> This is the whole problem.  You can't set buffer to be FF_MIN_BUFFER_SIZE
> in case of PCM, or more strictly, you can't set buf_size to be that value.
> This is why I asked about actual size vs. buf_size.

if you provide less than FF_MIN_BUFFER_SIZE and the code ends up needing
more than behavior is undefined (that is your computer can join the closest
if you provide more or equal than FF_MIN_BUFFER_SIZE and the code ends up
needing more than you get a clear failure

you can never just use FF_MIN_BUFFER_SIZE, as this will in general be too

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

If you really think that XML is the answer, then you definitly missunderstood
the question -- Attila Kinali
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