Hello, Thank you so much for the information. I will try that and see. I have found a workaround. Don't know if this is the correct way of doing this though. Created AVOutputFormat using "AVOutputFormat* oformat = av_guess_format( "flv", NULL, NULL)" and then manually edited the audio and video codec fields in "oformat" before giving it to avformat_alloc_output_context2. It works and I'm able to stream audio and video.
But I get the following warning: "Failed to update header with correct duration.Failed to update header with correct filesize." In the command line, I rectified this error with the flag -flvflags no_duration_filesize. Could you tell me how to set this flag in the API ? Thank you so much. Best Regards, Mythili Vishalini. On Tue, Jun 8, 2021 at 11:19 PM Guangyu Sun via Libav-user < [email protected]> wrote: > This might be what you are looking for: > AVStream *avformat_new_stream(AVFormatContext *s, const AVCodec *c); > > Specify the correct codec when adding streams to the AVFormatContext > created by avformat_alloc_output_context2(). > > On Mon, Jun 7, 2021 at 11:39 PM Mythili Vishalini Anbazhagan < > [email protected]> wrote: > >> Hi, >> I'm using ffmpeg libav library for live streaming via RTMP. I want to >> know how to give my choice of audio and video codec for the particular >> format in avformat_alloc_output_context2. >> >> In Detail: >> The following command works perfectly for me. >> ffmpeg -re -stream_loop -1 -i ~/Downloads/Microsoft_Surface.mp4 -vcodec >> copy -c:a aac -b:a 160k -ar 44100 -strict -2 -f flv -flvflags >> no_duration_filesize rtmp://192.168.1.7/live/surface >> In the output, I have set my audio codec to be aac and copied the video >> codec from input, which is H264. >> I want to emulate this in the library, but don't know how to. >> avformat_alloc_output_context2, with parameter format name as "flv", sets >> oformat audio codec to ADPCM_SWF and video codec to FLV1. How to change >> that to AAC and H264 ? >> >> So far, used av_guess_format to construct AVOutputFormat. It accepts only >> format as input. And I don't know where to mention audio and video codec. >> Also tried giving filename to avformat_alloc_output_context2 with the >> rest of the parameters NULL. The file has AAC audio and H264 video. But >> still ffmpeg loads oformat with ADPCM_SWF audio and FLV1 video codecs. >> >> Any hint/guidance is hugely appreciated. Thank you. >> >> _______________________________________________ >> Libav-user mailing list >> [email protected] >> https://ffmpeg.org/mailman/listinfo/libav-user >> >> To unsubscribe, visit link above, or email >> [email protected] with subject "unsubscribe". >> > _______________________________________________ > Libav-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/libav-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". >
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