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".
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