I don’t remember exactly but you can use av_copy_context api to copy all needed parameters
On Wed, Jan 1, 2020 at 17:44 Audric Ackermann <audric.ackerm...@gmail.com> wrote: > And so, how can I copy all the input parameters? To get the same > parameters in the recorded file? > > Le mer. 1 janv. 2020 à 21:36, Việt Hùng Nguyễn <hungtro...@gmail.com> a > écrit : > >> Yes, exactly! >> >> On Wed, Jan 1, 2020, 17:10 Audric Ackermann <audric.ackerm...@gmail.com> >> wrote: >> >>> But if I want to avoid missing the first few frames which are not a key >>> frame, I have to reencode the data, so the first frame recorded is a key >>> frame, right? >>> >>> Le mer. 1 janv. 2020 à 20:49, Strahinja Radman <dr.stras...@gmail.com> >>> a écrit : >>> >>>> If you only want to copy the input, there is no need to transcode. You >>>> can simply duplicate the input packets, one packet goes to the decoder so >>>> it can be shown, the other >>>> goes to the muxer for the recorder when someone presses the record >>>> button. You can save to whatever format you want but input may not be >>>> playable from the start until >>>> it reaches the key frame. Deep packet copy can be achieved with the >>>> following code: >>>> >>>> AVPacket packet; >>>> av_init_packet(&packet); >>>> av_packet_ref(packet, src); >>>> av_packet_make_writable(&packet); >>>> >>>> You can based on the decoded frames, mark a key frame packet and start >>>> saving from there. >>>> >>>> On Wed, Jan 1, 2020 at 10:06 AM Audric Ackermann < >>>> audric.ackerm...@gmail.com> wrote: >>>> >>>>> Ok thank you. >>>>> As I do not control the input parameters I will go for the transcode >>>>> option. Is there an easy way to duplicate all required decoder parameters >>>>> to the encoder? >>>>> >>>>> Like doing this, but with all important params in one step: >>>>> >>>>> Thanks >>>>> >>>>> outst->codec->width = this->codec_ctx->width; >>>>> outst->codec->height = this->codec_ctx->height; >>>>> outst->codec->pix_fmt = this->codec_ctx->pix_fmt; >>>>> outst->codec->time_base = this->codec_ctx->time_base; >>>>> _______________________________________________ >>>>> Libav-user mailing list >>>>> Libav-user@ffmpeg.org >>>>> https://ffmpeg.org/mailman/listinfo/libav-user >>>>> >>>>> To unsubscribe, visit link above, or email >>>>> libav-user-requ...@ffmpeg.org with subject "unsubscribe". >>>> >>>> >>>> >>>> -- >>>> >>>> Regards >>>> Strahinja Radman >>>> _______________________________________________ >>>> Libav-user mailing list >>>> Libav-user@ffmpeg.org >>>> https://ffmpeg.org/mailman/listinfo/libav-user >>>> >>>> To unsubscribe, visit link above, or email >>>> libav-user-requ...@ffmpeg.org with subject "unsubscribe". >>> >>> _______________________________________________ >>> Libav-user mailing list >>> Libav-user@ffmpeg.org >>> https://ffmpeg.org/mailman/listinfo/libav-user >>> >>> To unsubscribe, visit link above, or email >>> libav-user-requ...@ffmpeg.org with subject "unsubscribe". >> >> _______________________________________________ >> Libav-user mailing list >> Libav-user@ffmpeg.org >> https://ffmpeg.org/mailman/listinfo/libav-user >> >> To unsubscribe, visit link above, or email >> libav-user-requ...@ffmpeg.org with subject "unsubscribe". > > _______________________________________________ > Libav-user mailing list > Libav-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/libav-user > > To unsubscribe, visit link above, or email > libav-user-requ...@ffmpeg.org with subject "unsubscribe".
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