Windows下Qt5，FFMpeg编译

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DEFINES += __STDC_LIMIT_MACROS

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DEFINES += __STDC_CONSTANT_MACROS

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DEFINES += __STDC_FORMAT_MACROS

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INCLUDEPATH += $$PWD/ffmpeg/include

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LIBS += -L$$PWD/ffmpeg/lib -lavcodec -lavfilter -lavformat -lavutil -lswresample -lswscale

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/** Save the encoder context for easiert access later. */

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*output_codec_context = stream->codec;

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/**

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* Set the basic encoder parameters.

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* The input file's sample rate is used to avoid a sample rate conversion.

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*/

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(*output_codec_context)->channels
= OUTPUT_CHANNELS;

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(*output_codec_context)->channel_layout = av_get_default_channel_layout(OUTPUT_CHANNELS);

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(*output_codec_context)->sample_rate
= input_codec_context->sample_rate;

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(*output_codec_context)->sample_fmt
= AV_SAMPLE_FMT_FLTP; //native encode只支持这一种采样率，所以转换时有可能丢失数据

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(*output_codec_context)->bit_rate
= OUTPUT_BIT_RATE;

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/**

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* Some container formats (like MP4) require global headers to be present

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* Mark the encoder so that it behaves accordingly.

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*/

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if ((*output_format_context)->oformat->flags & AVFMT_GLOBALHEADER)

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(*output_codec_context)->flags |= CODEC_FLAG_GLOBAL_HEADER;

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av_dict_set(&opts, "strict", "experimental", 0);

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/** Open the encoder for the audio stream to use it later. */

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error = avcodec_open2(*output_codec_context, output_codec, &opts);

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//
av_dict_free(&opts);

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if (error < 0) {

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fprintf(stderr, "Could not open output codec (error '%s')n",

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get_error_text(error));

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goto cleanup;

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}

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