ffmpeg: Use av_stream_get_parser() to avoid ABI issues

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

ffmpeg.c

@@ -2109,7 +2109,7 @@ static int output_packet(InputStream *ist, const AVPacket *pkt)
             if (avpkt.duration) {
                 duration = av_rescale_q(avpkt.duration, ist->st->time_base, AV_TIME_BASE_Q);
             } else if(ist->dec_ctx->time_base.num != 0 && ist->dec_ctx->time_base.den != 0) {
-                int ticks= ist->st->parser ? ist->st->parser->repeat_pict+1 : ist->dec_ctx->ticks_per_frame;
+                int ticks= av_stream_get_parser(ist->st) ? av_stream_get_parser(ist->st)->repeat_pict+1 : ist->dec_ctx->ticks_per_frame;
                 duration = ((int64_t)AV_TIME_BASE *
                                 ist->dec_ctx->time_base.num * ticks) /
                                 ist->dec_ctx->time_base.den;
@@ -2168,7 +2168,7 @@ static int output_packet(InputStream *ist, const AVPacket *pkt)
             } else if (pkt->duration) {
                 ist->next_dts += av_rescale_q(pkt->duration, ist->st->time_base, AV_TIME_BASE_Q);
             } else if(ist->dec_ctx->time_base.num != 0) {
-                int ticks= ist->st->parser ? ist->st->parser->repeat_pict + 1 : ist->dec_ctx->ticks_per_frame;
+                int ticks= av_stream_get_parser(ist->st) ? av_stream_get_parser(ist->st)->repeat_pict + 1 : ist->dec_ctx->ticks_per_frame;
                 ist->next_dts += ((int64_t)AV_TIME_BASE *
                                   ist->dec_ctx->time_base.num * ticks) /
                                   ist->dec_ctx->time_base.den;