transcoding: set 30fps by default when the video decoder cannot determine frame timin...

diff --git a/src/plumbing/transcoding.c b/src/plumbing/transcoding.c
index c7bd3e6d97c75fc5a6e7a26ff1c6c44a9d52d443..1956e55aefb6491008a69326518bc0b846119f5a 100644 (file)
--- a/src/plumbing/transcoding.c
+++ b/src/plumbing/transcoding.c
@@ -1239,6 +1239,15 @@ transcoder_stream_video(transcoder_t *t, transcoder_stream_t *ts, th_pkt_t *pkt)
     // Encoder uses "time_base" for bitrate calculation, but "time_base" from decoder
     // will be deprecated in the future, therefore calculate "time_base" from "framerate" if available.
     octx->ticks_per_frame = ictx->ticks_per_frame;
+    if (ictx->framerate.num == 0) {
+      ictx->framerate.num = 30;
+      ictx->framerate.den = 1;
+    }
+    if (ictx->time_base.num == 0) {
+      ictx->time_base.num = ictx->framerate.den;
+      ictx->time_base.den = ictx->framerate.num;
+    }
+    octx->framerate = ictx->framerate;
 #if LIBAVCODEC_VERSION_MICRO >= 100 && LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(56, 13, 100) // ffmpeg 2.5
     octx->time_base       = av_inv_q(av_mul_q(ictx->framerate, av_make_q(ictx->ticks_per_frame, 1)));
 #else