I find a problem in the example file mux.c, and I need some help about how to
modify the codec of a muxer
// The filename is xxx.flv // The default codec for flv is
AV_CODEC_ID_ADPCM_SWF and AV_CODEC_ID_FLV1 // If I want to modify the codec I
need to copy the entire value of return pointer of av_guess_format() like this,
since it returns a const pointer I can not modify it directly // It will cause
a segmentation fault when I call avformat_write_header(), because it didn't
copy the write_header function pointer in private fileds AVOutputFormat
av_flv_format; av_flv_format = *(AVOutputFormat*)av_guess_format(NULL,
filename, NULL); av_flv_format.audio_codec = AV_CODEC_ID_AAC;
av_flv_format.video_codec = AV_CODEC_ID_H264; // Then I try to copy the whole
FFOutputFormat to modify the codec // Because I can't include the mux.h file so
I need to copy the definition of FFOutputFormat FFOutputFormat ff_flv_format;
ff_flv_format = *(FFOutputFormat*)av_guess_format(NULL, filename, NULL);
ff_flv_format.p.audio_codec = AV_CODEC_ID_AAC; ff_flv_format.p.video_codec =
AV_CODEC_ID_H264; // At this time, it works
avformat_alloc_output_context2(&oc,&ff_flv_format, NULL, filename);
What should I do if I want to modify the codec?
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