Ye, x264. Thanks for the advice, seem to work much better now :)
Cheers, Attila ----------------------------------------- DTU Computing Center - www.cc.dtu.dk [email protected], [email protected], [email protected] On Sat, Jul 6, 2013 at 6:46 PM, Faraz Khan <[email protected]> wrote: > Are you using x264? x264 has this awesome option called intra_refresh - > set that to one and use the keyint_max stuff to specify how quickly you > want a intra refresh. It can be as quick as 2-3 times the framerate. With > that, the decoder would magically recover even if you have 100% packet loss > :) > > > > On Sat, Jul 6, 2013 at 9:42 AM, Attila Sukosd <[email protected]>wrote: > >> Hi Faraz, >> >> Thanks a lot for your fast reply! I guess I will try to do it as you say, >> reconstruct the frame out of the arrived NALUs and feed that to the decoder >> at once. >> Did you run some tests on what happens in case some of the NALUs get lost >> due to packet loss? >> >> Best, >> >> Attila >> >> >> ----------------------------------------- >> DTU Computing Center - www.cc.dtu.dk >> [email protected], [email protected], [email protected] >> >> >> >> On Sat, Jul 6, 2013 at 6:35 PM, Faraz Khan <[email protected]> wrote: >> >>> Atilla, >>> We tried this and came to the conclusion that ffmpeg is probably not >>> designed to handle a single NALU at a time. You can get the parser to work >>> in a sort of unreliable fashion if you turn on Annex-b headers in your >>> encoder (we were using x264). However the parser may still be unable to >>> read frames. The only reliable way is to not use the parser and feed the >>> entire frame (directly) to ffmpeg decode. For this to work you would need >>> some rtp magic / a jitterbuffer to accumulate these NALUs back into the >>> entire frame. This works just fine with annex-b headers/repeat headers >>> using x264. >>> >>> >>> >>> >>> >>> On Sat, Jul 6, 2013 at 6:49 AM, Attila Sukosd >>> <[email protected]>wrote: >>> >>>> Hi guys, >>>> >>>> There was this thread about decoding NALUs one-by-one with >>>> parser2/decode2 and I'm having exactly the same issue. >>>> >>>> I have x264 creating a bunch of NALUs, in annex_b and repeate_headers, >>>> and trying to decode them one by one on the client side. When I concatenate >>>> all the NALUs per frame into one large packet, and feed that directly into >>>> avcodec_decode_video2, everything is fine, the decode is successful. >>>> However, when I try to feed single NALs directly to >>>> avcodec_decode_video2, it spits out a bunch of errors. After searching for >>>> a while on the net, I read some place that certain types of NALs affect the >>>> rest of the data stream, and they need to be group together. >>>> I've tried to run the NALs through av_parser_parse2 and tried to decode >>>> the output buffer when the output size was larger than zero, however, after >>>> looking at the output buffer contents, it seems like while the output size >>>> seems reasonable (around the size of the NALs or a combination of a number >>>> of previous NALs), the output buffer content contains 3-4 bytes, and the >>>> rest is zero. >>>> >>>> The decoding looks like this: >>>> >>>> ret = av_parser_parse2(decoder->pParserCtx, decoder->pCodecCtx, >>>> decoder->tmp_data, &outsize, buff, size, 0, 0, AV_NOPTS_VALUE); >>>> printf("%p buff, %p outdata, consumed %d, %d bufsize, %d outsize\n", >>>> buff, decoder->tmp_data,ret, size, outsize); >>>> disp_buff(decoder->tmp_data, 50); >>>> >>>> if (outsize <= 0) return 0; >>>> >>>> decoder->avpkt.flags = AV_PKT_FLAG_KEY; >>>> decoder->avpkt.data = decoder->tmp_data; >>>> decoder->avpkt.size = outsize; >>>> >>>> got_picture = 0; >>>> if ((ret = avcodec_decode_video2(decoder->pCodecCtx, decoder->pFrame, >>>> &got_picture, &decoder->avpkt)) < 0) { >>>> LOGE(__FUNCTION__, "H264 decoding failed!\n"); >>>> return -1; >>>> } >>>> >>>> >>>> Could someone shed some light on if I'm really off the right track? or >>>> am I just missing something very trivial? >>>> >>>> >>>> Best Regards, >>>> >>>> Attila >>>> >>>> _______________________________________________ >>>> Libav-user mailing list >>>> [email protected] >>>> http://ffmpeg.org/mailman/listinfo/libav-user >>>> >>>> >>> >>> >>> -- >>> >>> -- >>> Faraz Khan >>> Simple Collaboration Screensharing >>> www.screenhero.com >>> >>> _______________________________________________ >>> Libav-user mailing list >>> [email protected] >>> http://ffmpeg.org/mailman/listinfo/libav-user >>> >>> >> >> _______________________________________________ >> Libav-user mailing list >> [email protected] >> http://ffmpeg.org/mailman/listinfo/libav-user >> >> > > > -- > > -- > Faraz Khan > Simple Collaboration Screensharing > www.screenhero.com > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > >
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