avformat/utils: do not wait for packets from discarded streams for genpts
Fixes long loop
Fixes Ticket3208
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 8202c49b43)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
			
			
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		@@ -1532,7 +1532,8 @@ int av_read_frame(AVFormatContext *s, AVPacket *pkt)
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            }
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            /* read packet from packet buffer, if there is data */
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            if (!(next_pkt->pts == AV_NOPTS_VALUE &&
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            st = s->streams[next_pkt->stream_index];
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            if (!(next_pkt->pts == AV_NOPTS_VALUE && st->discard < AVDISCARD_ALL &&
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                  next_pkt->dts != AV_NOPTS_VALUE && !eof)) {
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                ret = read_from_packet_buffer(&s->packet_buffer,
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                                               &s->packet_buffer_end, pkt);
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