[Libav-user] AVStream->codec deprecation

[Charles]

On 08/21/2016 08:31 PM, salsaman wrote:
> Here we go, I can answer definitively now:
>
> https://ffmpeg.org/doxygen/3.1/ffplay_8c_source.html
>
>
> AVCodecContext <https://ffmpeg.org/doxygen/3.1/structAVCodecContext.html> *avctx;
>
> avctx = avcodec_alloc_context3 <https://ffmpeg.org/doxygen/3.1/group__lavc__core.html#gae80afec6f26df6607eaacf39b561c315>(NULL
> <https://ffmpeg.org/doxygen/3.1/coverity_8c.html#a070d2ce7b6bb7e5c05602aa8c308d0c4>);
> if (!avctx)
>    return AVERROR <https://ffmpeg.org/doxygen/3.1/group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca>(ENOMEM);
>
> ret = avcodec_parameters_to_context <https://ffmpeg.org/doxygen/3.1/group__lavc__core.html#gac7b282f51540ca7a99416a3ba6ee0d16>(avctx,
> ic->streams <https://ffmpeg.org/doxygen/3.1/structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348>[stream_index]->codecpar
> <https://ffmpeg.org/doxygen/3.1/structAVStream.html#a12826d21779289356722971d362c583c>);
> if (ret < 0)
>   goto fail <https://ffmpeg.org/doxygen/3.1/checkasm_8h.html#a73a3b169ac8c3419cbe15327e75ffcfd>;
>
>
> Gabriel.
>

> http://lives-video.com
> https://www.openhub.net/accounts/salsaman
>
> On Sun, Aug 21, 2016 at 10:05 PM, salsaman <salsaman at gmail.com <mailto:salsaman at gmail.com>> wrote:
>
>     There was some post on here a few days ago about it being replaced with AVCodecParameters.
>
>     https://ffmpeg.org/doxygen/3.1/structAVCodecParameters.html <https://ffmpeg.org/doxygen/3.1/structAVCodecParameters.html>
>
>     So you could try stream->codecparameters
>
>     http://lives-video.com
>     https://www.openhub.net/accounts/salsaman <https://www.openhub.net/accounts/salsaman>
>
>     On Sun, Aug 21, 2016 at 9:27 PM, Brian Brice <bbrice at gmail.com <mailto:bbrice at gmail.com>> wrote:
>
>         This is a great question.  I'm just now trying to familiarize myself
>         with the 3.1 API, and little things like this come up.  I'd like to
>         know the answer to this as well.
>
>         Perette, have you tried the IRC channel?
>         chat.freenode.net <http://chat.freenode.net> / #ffmpeg
>
>         On Sun, Aug 21, 2016 at 5:00 PM, Perette Barella <perette at barella.org <mailto:perette at barella.org>> wrote:
>         > In the structure AVStream, member ‘AVCodecContext *codec’ is marked
>         > deprecated, and my use of it is causes compile warnings.
>         >
>         > avformat_new_stream documentation
>         > https://ffmpeg.org/doxygen/3.1/group__lavf__core.html#gadcb0fd3e507d9b58fe78f61f8ad39827
>         <https://ffmpeg.org/doxygen/3.1/group__lavf__core.html#gadcb0fd3e507d9b58fe78f61f8ad39827>
>         > indicates I’m to "call avcodec_close() and avformat_free_context() to clean
>         > up the allocation by avformat_new_stream()”.
>         >
>         > avcodec_close requires an AVCodecContext, which is in the deprecated
>         > “codec”.
>         >
>         > So what’s the deal?  Is there a new way I’m supposed to access this member?
>         >
>         > Perette
>         >
>         --
>         Brian Brice
>         http://heapify.org/
>         _______________________________________________


same but different?

   AVCodec * codec = avcodec_find_decoder(  av_fmt_ctx->streams[ stream_id ]->codecpar->codec_id );
    if ( !codec )
[...]
    av_codec_ctx = avcodec_alloc_context3( codec );
    if ( !av_codec_ctx )
[...]
    if ( avcodec_parameters_to_context( av_codec_ctx, av_fmt_ctx->streams[ stream_id ]->codecpar ) < 0 )


Thanks
cco