qtdemux: Ignore raw audio streams when adjusting seek

Because we treat raw audio chunks/samples as keyframes, they were interfering
with seek time adjustment.
Became apparent when the accompanying video stream was I-frame only,
for example ProRes.
Since raw audio streams can be seeked freely, it's fine to just ignore them here,
giving priority to the real keyframes in the video stream.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5674>

diff --git a/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c b/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
index efd48b1..a202f91 100644 (file)
--- a/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
+++ b/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
@@ -1144,6 +1144,10 @@ gst_qtdemux_adjust_seek (GstQTDemux * qtdemux, gint64 desired_time,
     if (CUR_STREAM (str)->sparse && !use_sparse)
       continue;
 
+    /* raw audio streams can be ignored as we can seek anywhere within them */
+    if (str->subtype == FOURCC_soun && str->need_clip)
+      continue;
+
     seg_idx = gst_qtdemux_find_segment (qtdemux, str, desired_time);
     GST_DEBUG_OBJECT (qtdemux, "align segment %d", seg_idx);