diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index c89a95937e..319e295df3 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -525,19 +525,17 @@ static void ffmpeg_cleanup(int ret)
             InputFilter *ifilter = fg->inputs[j];
             struct InputStream *ist = ifilter->ist;
 
-            while (av_fifo_size(ifilter->frame_queue)) {
+            while (av_fifo_can_read(ifilter->frame_queue)) {
                 AVFrame *frame;
-                av_fifo_generic_read(ifilter->frame_queue, &frame,
-                                     sizeof(frame), NULL);
+                av_fifo_read(ifilter->frame_queue, &frame, 1);
                 av_frame_free(&frame);
             }
             av_fifo_freep(&ifilter->frame_queue);
             av_freep(&ifilter->displaymatrix);
             if (ist->sub2video.sub_queue) {
-                while (av_fifo_size(ist->sub2video.sub_queue)) {
+                while (av_fifo_can_read(ist->sub2video.sub_queue)) {
                     AVSubtitle sub;
-                    av_fifo_generic_read(ist->sub2video.sub_queue,
-                                         &sub, sizeof(sub), NULL);
+                    av_fifo_read(ist->sub2video.sub_queue, &sub, 1);
                     avsubtitle_free(&sub);
                 }
                 av_fifo_freep(&ist->sub2video.sub_queue);
@@ -1954,15 +1952,11 @@ static int ifilter_send_frame(InputFilter *ifilter, AVFrame *frame, int keep_ref
             if (!tmp)
                 return AVERROR(ENOMEM);
 
-            if (!av_fifo_space(ifilter->frame_queue)) {
-                ret = av_fifo_realloc2(ifilter->frame_queue, 2 * av_fifo_size(ifilter->frame_queue));
-                if (ret < 0) {
-                    av_frame_free(&tmp);
-                    return ret;
-                }
-            }
-            av_fifo_generic_write(ifilter->frame_queue, &tmp, sizeof(tmp), NULL);
-            return 0;
+            ret = av_fifo_write(ifilter->frame_queue, &tmp, 1);
+            if (ret < 0)
+                av_frame_free(&tmp);
+
+            return ret;
         }
 
         ret = reap_filters(1);
@@ -2285,15 +2279,13 @@ static int transcode_subtitles(InputStream *ist, AVPacket *pkt, int *got_output,
         sub2video_update(ist, INT64_MIN, &subtitle);
     } else if (ist->nb_filters) {
         if (!ist->sub2video.sub_queue)
-            ist->sub2video.sub_queue = av_fifo_alloc(8 * sizeof(AVSubtitle));
+            ist->sub2video.sub_queue = av_fifo_alloc2(8, sizeof(AVSubtitle), AV_FIFO_FLAG_AUTO_GROW);
         if (!ist->sub2video.sub_queue)
             exit_program(1);
-        if (!av_fifo_space(ist->sub2video.sub_queue)) {
-            ret = av_fifo_realloc2(ist->sub2video.sub_queue, 2 * av_fifo_size(ist->sub2video.sub_queue));
-            if (ret < 0)
-                exit_program(1);
-        }
-        av_fifo_generic_write(ist->sub2video.sub_queue, &subtitle, sizeof(subtitle), NULL);
+
+        ret = av_fifo_write(ist->sub2video.sub_queue, &subtitle, 1);
+        if (ret < 0)
+            exit_program(1);
         free_sub = 0;
     }
 
diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
index 1f6cba2c04..c468456d54 100644
--- a/fftools/ffmpeg_filter.c
+++ b/fftools/ffmpeg_filter.c
@@ -178,7 +178,7 @@ int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
     ifilter->graph  = fg;
     ifilter->format = -1;
 
-    ifilter->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
+    ifilter->frame_queue = av_fifo_alloc2(8, sizeof(AVFrame*), AV_FIFO_FLAG_AUTO_GROW);
     if (!ifilter->frame_queue)
         exit_program(1);
 
@@ -286,7 +286,7 @@ static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
     ifilter->type   = ist->st->codecpar->codec_type;
     ifilter->name   = describe_filter_link(fg, in, 1);
 
-    ifilter->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
+    ifilter->frame_queue = av_fifo_alloc2(8, sizeof(AVFrame*), AV_FIFO_FLAG_AUTO_GROW);
     if (!ifilter->frame_queue)
         exit_program(1);
 
@@ -1106,9 +1106,9 @@ int configure_filtergraph(FilterGraph *fg)
     }
 
     for (i = 0; i < fg->nb_inputs; i++) {
-        while (av_fifo_size(fg->inputs[i]->frame_queue)) {
+        while (av_fifo_can_read(fg->inputs[i]->frame_queue)) {
             AVFrame *tmp;
-            av_fifo_generic_read(fg->inputs[i]->frame_queue, &tmp, sizeof(tmp), NULL);
+            av_fifo_read(fg->inputs[i]->frame_queue, &tmp, 1);
             ret = av_buffersrc_add_frame(fg->inputs[i]->filter, tmp);
             av_frame_free(&tmp);
             if (ret < 0)
@@ -1129,9 +1129,9 @@ int configure_filtergraph(FilterGraph *fg)
     for (i = 0; i < fg->nb_inputs; i++) {
         InputStream *ist = fg->inputs[i]->ist;
         if (ist->sub2video.sub_queue && ist->sub2video.frame) {
-            while (av_fifo_size(ist->sub2video.sub_queue)) {
+            while (av_fifo_can_read(ist->sub2video.sub_queue)) {
                 AVSubtitle tmp;
-                av_fifo_generic_read(ist->sub2video.sub_queue, &tmp, sizeof(tmp), NULL);
+                av_fifo_read(ist->sub2video.sub_queue, &tmp, 1);
                 sub2video_update(ist, INT64_MIN, &tmp);
                 avsubtitle_free(&tmp);
             }
