----- Original Message ----- > From: "Carl Eugen Hoyos" <[email protected]> > To: "This list is about using libavcodec, libavformat, libavutil, libavdevice > and libavfilter." <[email protected]> > Sent: Sunday, 11 February, 2018 19:51:56 > Subject: Re: [Libav-user] Speeding up codec detection of raw bitstream
> 2018-02-11 19:09 GMT+01:00 Wiebe Cazemier <[email protected]>: > >> Correction, it's the following line that takes a while: >> >> avformat_find_stream_info(avFormatContext, NULL); >> >> In the docs I find this note with that function: "TODO: Let >> the user decide somehow what information is needed so >> that we do not waste time getting stuff the user does not >> need. ". >> >> Still any options available to speed this up? > > Did you test to only enable the demuxers (and decoders) that you need? > > Carl Eugen I was able to register only AC3 by creating an AVCodec with 'AVCodec* avcodec_find_decoder (enum AVCodecID id)' and using avcodec_register, but it didn't help much. I did find out the AVFormat instantly recognize it as s/pdif, so apparently those frames are intact. As far as I can tell the meta data doesn't contain which codec it contains, but I need to look into that a little deeper. If it had, ffmpeg would have recognized it, I would say. But there must be a better way, because home cinema receivers can do it instantly too. _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
