If I change

pCodecCtx->sample_fmt = AV_SAMPLE_FMT_S16;

to

pCodecCtx->sample_fmt = AV_SAMPLE_FMT_U8;

Then I get the following error:

[pcm_mulaw @ 0x2d33450] Specified sample_fmt is not supported.

Any idea? Thanks
    On Friday, December 3, 2021, 06:15:54 PM EST, Bob Kirnum 
<[email protected]> wrote:  
 
 G.711 is 8 bits, could be an issue. Also, not sure if you need to downsample 
to 8kHz manually or not. 

> On Dec 3, 2021, at 5:36 PM, Robert Smith via Libav-user 
> <[email protected]> wrote:
> 
> pCodecCtx->sample_fmt = AV_SAMPLE_FMT_S16;
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