+
+int avformat_transfer_internal_stream_timing_info(const AVOutputFormat *ofmt,
+ AVStream *ost, const AVStream *ist,
+ enum AVTimebaseSource copy_tb)
+{
+ //TODO: use [io]st->internal->avctx
+ const AVCodecContext *dec_ctx = ist->codec;
+ AVCodecContext *enc_ctx = ost->codec;
+
+ enc_ctx->time_base = ist->time_base;
+ /*
+ * Avi is a special case here because it supports variable fps but
+ * having the fps and timebase differe significantly adds quite some
+ * overhead
+ */
+ if (!strcmp(ofmt->name, "avi")) {
+#if FF_API_R_FRAME_RATE
+ if (copy_tb == AVFMT_TBCF_AUTO && ist->r_frame_rate.num
+ && av_q2d(ist->r_frame_rate) >= av_q2d(ist->avg_frame_rate)
+ && 0.5/av_q2d(ist->r_frame_rate) > av_q2d(ist->time_base)
+ && 0.5/av_q2d(ist->r_frame_rate) > av_q2d(dec_ctx->time_base)
+ && av_q2d(ist->time_base) < 1.0/500 && av_q2d(dec_ctx->time_base) < 1.0/500
+ || copy_tb == AVFMT_TBCF_R_FRAMERATE) {
+ enc_ctx->time_base.num = ist->r_frame_rate.den;
+ enc_ctx->time_base.den = 2*ist->r_frame_rate.num;
+ enc_ctx->ticks_per_frame = 2;
+ } else
+#endif
+ if (copy_tb == AVFMT_TBCF_AUTO && av_q2d(dec_ctx->time_base)*dec_ctx->ticks_per_frame > 2*av_q2d(ist->time_base)
+ && av_q2d(ist->time_base) < 1.0/500
+ || copy_tb == AVFMT_TBCF_DECODER) {
+ enc_ctx->time_base = dec_ctx->time_base;
+ enc_ctx->time_base.num *= dec_ctx->ticks_per_frame;
+ enc_ctx->time_base.den *= 2;
+ enc_ctx->ticks_per_frame = 2;
+ }
+ } else if (!(ofmt->flags & AVFMT_VARIABLE_FPS)
+ && !av_match_name(ofmt->name, "mov,mp4,3gp,3g2,psp,ipod,ismv,f4v")) {
+ if (copy_tb == AVFMT_TBCF_AUTO && dec_ctx->time_base.den
+ && av_q2d(dec_ctx->time_base)*dec_ctx->ticks_per_frame > av_q2d(ist->time_base)
+ && av_q2d(ist->time_base) < 1.0/500
+ || copy_tb == AVFMT_TBCF_DECODER) {
+ enc_ctx->time_base = dec_ctx->time_base;
+ enc_ctx->time_base.num *= dec_ctx->ticks_per_frame;
+ }
+ }
+
+ if ((enc_ctx->codec_tag == AV_RL32("tmcd") || ost->codecpar->codec_tag == AV_RL32("tmcd"))
+ && dec_ctx->time_base.num < dec_ctx->time_base.den
+ && dec_ctx->time_base.num > 0
+ && 121LL*dec_ctx->time_base.num > dec_ctx->time_base.den) {
+ enc_ctx->time_base = dec_ctx->time_base;
+ }
+
+ if (ost->avg_frame_rate.num)
+ enc_ctx->time_base = av_inv_q(ost->avg_frame_rate);
+
+ av_reduce(&enc_ctx->time_base.num, &enc_ctx->time_base.den,
+ enc_ctx->time_base.num, enc_ctx->time_base.den, INT_MAX);
+
+ return 0;
+}
+
+AVRational av_stream_get_codec_timebase(const AVStream *st)
+{
+ // See avformat_transfer_internal_stream_timing_info() TODO.
+#if FF_API_LAVF_AVCTX
+FF_DISABLE_DEPRECATION_WARNINGS
+ return st->codec->time_base;
+FF_ENABLE_DEPRECATION_WARNINGS
+#else
+ return st->internal->avctx->time_base;
+#endif
+}