[Libav-user] Fwd: resize video stream

[Gonzalo Garramuño]

El 5/4/21 a las 05:13, Сергей Икол escribió:
>
>
>       Gonzalo Garramuño
>
> Thank you very much for your help.
>
> I think I'm completely confused ((
>
> line 352 (avcodec_send_frame ()) constantly returns -22
>
> it seems to me that somewhere I am making a fundamental mistake ((

You are not initializing the codec for encoding nor opening the context, 
which are the one line in avcodec_send_frame which returns -22.


     AVCodec *codec = avcodec_find_decoder(in_cctx->codec_id)
     AVCodec *encoder = avcodec_find_encoder(in_cctx->codec_id);
     avcodec_open2(in_cctx, codec, NULL);
     out_cctx = avcodec_alloc_context3(encoder);
     out_cctx->codec = encoder;
     out_cctx->bit_rate = in_cctx->bit_rate;
     out_cctx->width = outWidth;
     out_cctx->height = outHeight;
     out_cctx->pix_fmt = AV_PIX_FMT_YUV420P;
     out_cctx->time_base = (AVRational){1, 25};
     out_cctx->framerate = (AVRational){25, 1};
     avcodec_open2(out_cctx, encoder, NULL);

}

int attribute_align_arg avcodec_send_frame(AVCodecContext *avctx, const 
AVFrame *frame)
{
     if (!avcodec_is_open(avctx) || !av_codec_is_encoder(avctx->codec))
       return AVERROR(EINVAL);

// ...etc...

}

That should get you past the -22, albeit it later segfaults for unknown 
reasons (you'll need to hunt this one yourself).
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