diff --git a/libavformat/imfdec.c b/libavformat/imfdec.c
index 847dead7f0..48bd5c78e8 100644
--- a/libavformat/imfdec.c
+++ b/libavformat/imfdec.c
@@ -103,10 +103,11 @@ typedef struct IMFVirtualTrackPlaybackCtx {
     int32_t index;                                 /**< Track index in playlist */
     AVRational current_timestamp;                  /**< Current temporal position */
     AVRational duration;                           /**< Overall duration */
-    uint32_t resource_count;                       /**< Number of resources */
+    uint32_t resource_count;                       /**< Number of resources (<= INT32_MAX) */
     unsigned int resources_alloc_sz;               /**< Size of the buffer holding the resource */
     IMFVirtualTrackResourcePlaybackCtx *resources; /**< Buffer holding the resources */
-    uint32_t current_resource_index;               /**< Current resource */
+    int32_t current_resource_index;                /**< Index of the current resource in resources,
+                                                        or < 0 if a current resource has yet to be selected */
     int64_t last_pts;                              /**< Last timestamp */
 } IMFVirtualTrackPlaybackCtx;
 
@@ -435,7 +436,6 @@ static int open_track_file_resource(AVFormatContext *s,
     IMFContext *c = s->priv_data;
     IMFAssetLocator *asset_locator;
     void *tmp;
-    int ret;
 
     asset_locator = find_asset_map_locator(&c->asset_locator_map, track_file_resource->track_file_uuid);
     if (!asset_locator) {
@@ -452,7 +452,7 @@ static int open_track_file_resource(AVFormatContext *s,
            UID_ARG(asset_locator->uuid),
            asset_locator->absolute_uri);
 
-    if (track->resource_count > UINT32_MAX - track_file_resource->base.repeat_count
+    if (track->resource_count > INT32_MAX - track_file_resource->base.repeat_count
         || (track->resource_count + track_file_resource->base.repeat_count)
             > INT_MAX / sizeof(IMFVirtualTrackResourcePlaybackCtx))
         return AVERROR(ENOMEM);
@@ -470,8 +470,6 @@ static int open_track_file_resource(AVFormatContext *s,
         vt_ctx.locator = asset_locator;
         vt_ctx.resource = track_file_resource;
         vt_ctx.ctx = NULL;
-        if ((ret = open_track_resource_context(s, &vt_ctx)) != 0)
-            return ret;
         track->resources[track->resource_count++] = vt_ctx;
         track->duration = av_add_q(track->duration,
                                    av_make_q((int)track_file_resource->base.duration
@@ -501,6 +499,7 @@ static int open_virtual_track(AVFormatContext *s,
 
     if (!(track = av_mallocz(sizeof(IMFVirtualTrackPlaybackCtx))))
         return AVERROR(ENOMEM);
+    track->current_resource_index = -1;
     track->index = track_index;
     track->duration = av_make_q(0, 1);
 
@@ -551,6 +550,9 @@ static int set_context_streams_from_tracks(AVFormatContext *s)
         AVStream *first_resource_stream;
 
         /* Open the first resource of the track to get stream information */
+        ret = open_track_resource_context(s, &c->tracks[i]->resources[0]);
+        if (ret)
+            return ret;
         first_resource_stream = c->tracks[i]->resources[0].ctx->streams[0];
         av_log(s, AV_LOG_DEBUG, "Open the first resource of track %d\n", c->tracks[i]->index);
 
@@ -741,7 +743,8 @@ static IMFVirtualTrackResourcePlaybackCtx *get_resource_context_for_timestamp(AV
                        track->index);
                 if (open_track_resource_context(s, &(track->resources[i])) != 0)
                     return NULL;
-                avformat_close_input(&(track->resources[track->current_resource_index].ctx));
+                if (track->current_resource_index > 0)
+                    avformat_close_input(&track->resources[track->current_resource_index].ctx);
                 track->current_resource_index = i;
             }