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

[salsaman]

You are calling: avcodec_parameters_to_context( av_encode_codec_ctx,
parameters ) but I think that is not in the example. Maybe only needed for
decoding ?





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

On Tue, Aug 23, 2016 at 9:30 AM, Charles <linux2 at orion15.org> wrote:

> Just posted the current version
> https://gist.github.com/LinuxwitChdoCtOr/74c1721dd7688cf1d16509ea2a52d231
> Thanks
> cco
>
>
> On 08/23/2016 07:22 AM, Charles wrote:
>
>> Thank you for looking.
>>
>> Yes, I pretty much started there, and pretty much have it open all the
>> time.
>> From what I can tell my code is doing the same thing:
>>
>>    av_encode_codec_ctx = avcodec_alloc_context3( av_encode_codec );
>>    if ( !av_encode_codec_ctx ) { PRINT_AV_ERROR(
>> "ERROR:avcodec_alloc_context3:" ); return -1; }
>>    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
>>
>> That code does not setup the output with
>>    avio_open( &av_out_fmt_ctx->pb, f.c_str(), AVIO_FLAG_WRITE )
>>    avformat_write_header( av_out_fmt_ctx, NULL )
>>
>> The header is where I see my error, either the muxer is unhappy or the
>> encoder is unhappy
>>
>> Output #0, mp4, to 'enc.mp4':
>>     Stream #0:0: Unknown: none (h264_nvenc) ([33][0][0][0] / 0x0021)
>> av_dump_format enc.mp4
>> [mp4 @ 0x786d60] Using AVStream.codec to pass codec parameters to muxers
>> is deprecated, use AVStream.codecpar instead.
>> [mp4 @ 0x786d60] dimensions not set
>> ERROR:avformat_write_header::
>>
>> Thanks
>> cco
>>
>> On 08/23/2016 07:01 AM, salsaman wrote:
>>
>>> 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 <mailto:
>>> 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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