Yes, exactly! On Wed, Jan 1, 2020, 17:10 Audric Ackermann <[email protected]> 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 <[email protected]> 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 < >> [email protected]> 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 >>> [email protected] >>> https://ffmpeg.org/mailman/listinfo/libav-user >>> >>> To unsubscribe, visit link above, or email >>> [email protected] with subject "unsubscribe". >> >> >> >> -- >> >> Regards >> Strahinja Radman >> _______________________________________________ >> 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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