[Libav-user] Create a muxer without enc_ctx = out_stream->codec

[salsaman]

Charles,
perhaps the example here can help ?

 https://ffmpeg.org/doxygen/3.1/decoding__encoding_8c_source.html#l00347





http://lives-video.com
https://www.openhub.net/accounts/salsaman

On Tue, Aug 23, 2016 at 8:39 AM, Charles <linux2 at orion15.org> wrote:

> On 08/23/2016 03:08 AM, Nicolas George wrote:
>
>> Le sextidi 6 fructidor, an CCXXIV, Charles a écrit :
>>
>>> 6 - avcodec_parameters_to_context( av_encode_codec_ctx,
>>> av_out_fmt_ctx->streams[ 0 ]->codecpar )
>>>
>>
>> You are copying the parameters from a newly created blank stream to an
>> initialized encoder. That feels wrong.
>>
>> Regards,
>>
>
> Thanks for the look, I did some rearranging and I am to the point where
> the muxer is happy or the encoder is happy but cant get both at the same
> time:
>
> Currently Op order:
> 1) av_encode_codec = avcodec_find_encoder( AV_CODEC_ID_H264 )
> 2) avformat_alloc_output_context2( &av_out_fmt_ctx, NULL, NULL, f.c_str()
> )
> 3) video_st = avformat_new_stream( av_out_fmt_ctx, av_encode_codec )
>    video_st->id = 0;
>    video_st->time_base.den   = 60; // * 2;
>    video_st->time_base.num   = 1;
>    // This solved the time_base error
> 4) parameters = video_st->codecpar;
>    parameters->codec_tag = tag;
>    parameters->format    = AV_PIX_FMT_YUV420P;
>    parameters->bit_rate  = 5e6;
>    parameters->width     = 1024;
>    parameters->height    = 768;
>    parameters->bit_rate  = 5e6;
>    av_dict_set( &av_dict_opts, "b", "2.5M", 0);
>    av_dict_set( &av_dict_opts, "preset", "losslesshp", 0 );
>    av_dict_set( &av_dict_opts, "profile", "high", 0 );
>    av_dict_set( &av_dict_opts, "rc", "vbr_minqp", 0 );
>    av_dict_set( &av_dict_opts, "gpu", "1", 0 );
> 5) av_encode_codec_ctx = avcodec_alloc_context3( av_encode_codec )
>    av_encode_codec_ctx->bit_rate    = 5e6;
>    av_encode_codec_ctx->width       = 1024;   /// \note multiple of 2
>    av_encode_codec_ctx->height      = 768;   /// \note multiple of 2
>    av_encode_codec_ctx->time_base   = (AVRational) { 1, 60 }; //* 2;
>    av_encode_codec_ctx->gop_size    = 15;      // Intra frames per x P
> frames
>    av_encode_codec_ctx->pix_fmt     = AV_PIX_FMT_YUV420P; // MUST DO NOT
> CHANGE nvenc required
>    // This appears to make h264_nvenc happy
> 6) avcodec_parameters_to_context( av_encode_codec_ctx, parameters )
> 7) avcodec_open2( av_encode_codec_ctx, av_encode_codec, &av_dict_opts )
>
> [mp4 @ 0xc2ed60] Using AVStream.codec to pass codec parameters to muxers
> is deprecated, use AVStream.codecpar instead.
> [mp4 @ 0xc2ed60] dimensions not set
>
> AVStream does not have dimensions, and the error makes me think its in the
> ctx but I am setting those dims.
>
> Clearly I am not setting something, just haven't found it.
>
>
> Thanks
> cco
>
>
>
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