lavd: use AVFrame.duration instead of AVFrame.pkt_duration

libavdevice/alsa_enc.c

@@ -131,7 +131,14 @@ static int audio_write_frame(AVFormatContext *s1, int stream_index,
     pkt.data     = (*frame)->data[0];
     pkt.size     = (*frame)->nb_samples * s->frame_size;
     pkt.dts      = (*frame)->pkt_dts;
-    pkt.duration = (*frame)->pkt_duration;
+#if FF_API_PKT_DURATION
+FF_DISABLE_DEPRECATION_WARNINGS
+    if ((*frame)->pkt_duration)
+        pkt.duration = (*frame)->pkt_duration;
+    else
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+    pkt.duration = (*frame)->duration;
     return audio_write_packet(s1, &pkt);
 }
 

libavdevice/pulse_audio_enc.c

@@ -686,7 +686,14 @@ static int pulse_write_frame(AVFormatContext *h, int stream_index,
     pkt.data     = (*frame)->data[0];
     pkt.size     = (*frame)->nb_samples * av_get_bytes_per_sample((*frame)->format) * (*frame)->ch_layout.nb_channels;
     pkt.dts      = (*frame)->pkt_dts;
-    pkt.duration = (*frame)->pkt_duration;
+#if FF_API_PKT_DURATION
+FF_DISABLE_DEPRECATION_WARNINGS
+    if ((*frame)->pkt_duration)
+        pkt.duration = (*frame)->pkt_duration;
+    else
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+    pkt.duration = (*frame)->duration;
     return pulse_write_packet(h, &pkt);
 }