Dana 7. 8. 2015. 22:44 osoba "Ganesh Ajjanagadde" <gajja...@mit.edu> napisala je: > > On Fri, Aug 7, 2015 at 4:09 PM, Paul B Mahol <one...@gmail.com> wrote: > > On 8/7/15, Ganesh Ajjanagadde <gajja...@mit.edu> wrote: > >> On Fri, Aug 7, 2015 at 11:59 AM, Paul B Mahol <one...@gmail.com> wrote: > >>> On 8/7/15, Ganesh Ajjanagadde <gajja...@mit.edu> wrote: > >>>> https://trac.ffmpeg.org/ticket/4753: > >>>> The issue seems to come from the fact that there are multiple frames per > >>>> packet. > >>>> In fact, the duration field of the packet is set incorrectly, > >>>> and reports the duration of a single frame only (80). > >>>> Unfortunately, I do not know about where/how this needs to be done, > >>>> but can do this if a dev outlines the process. > >>> > >>> Write trivial g729_parser which splits input into 8 byte packets. > >> > >> Thanks, I have implemented the 8 byte case. > >> > >>> > >>> Problem is how to tell parser from demuxer that another non 8 byte > >>> mode is in operation. > >>> Because decoder operates in one of two modes, either 8 byte or 10 byte. > >> > >> This is tricky. A dirty but simple solution would be to add a field to > >> the priv_data of the avctx, > >> i.e to G729Context to represent the format, and use that in the parser. > >> I have not seen any other parser do this though. > >> > >> Note that the parser is quite limited in what it can see: > >> the AVCodecParserContext can't contain this information as far as I can > >> tell, > >> so only AVCodecContext can. > >> In this case I don't know how to do this without resorting to the priv_data. > > > > At decoder level you can not guess it, neither at demuxer level and > > AFAIK only wav does > > put multiple frames into single packet. The only way is via option but > > AFAIK you can not read decoder options from parser. > > I must be missing something, g729dec.c decode_frame does set packet_type > to the appropriate mode based on avpkt->size. > In fact, this is how currently the two modes (8k vs 6.4k) are differentiated. > Why can't this be used to set a flag in avctx->priv_data (barring the ugliness)?
For example 80 is multiple of 8 and 10 you can't use that to guess mode. > > > > >> > >> Any suggestions? > >> > >>> > >>>> > >>>> Thanks, > >>>> Ganesh > >>>> _______________________________________________ > >>>> ffmpeg-devel mailing list > >>>> ffmpeg-devel@ffmpeg.org > >>>> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > >>>> > >>> _______________________________________________ > >>> ffmpeg-devel mailing list > >>> ffmpeg-devel@ffmpeg.org > >>> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > >> _______________________________________________ > >> ffmpeg-devel mailing list > >> ffmpeg-devel@ffmpeg.org > >> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > >> > > _______________________________________________ > > ffmpeg-devel mailing list > > ffmpeg-devel@ffmpeg.org > > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
