diff --git a/libavcodec/ac3enc_fixed.c b/libavcodec/ac3enc_fixed.c
index 1430c3352c..e471edf08c 100644
--- a/libavcodec/ac3enc_fixed.c
+++ b/libavcodec/ac3enc_fixed.c
@@ -149,7 +149,7 @@ AVCodec ff_ac3_fixed_encoder = {
     .init            = ac3_fixed_encode_init,
     .encode2         = ff_ac3_fixed_encode_frame,
     .close           = ff_ac3_encode_close,
-    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
+    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P,
                                                       AV_SAMPLE_FMT_NONE },
     .long_name       = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
     .priv_class      = &ac3enc_class,
diff --git a/libavcodec/ac3enc_float.c b/libavcodec/ac3enc_float.c
index 45645da655..a225d9b4bd 100644
--- a/libavcodec/ac3enc_float.c
+++ b/libavcodec/ac3enc_float.c
@@ -148,7 +148,7 @@ AVCodec ff_ac3_encoder = {
     .init            = ff_ac3_encode_init,
     .encode2         = ff_ac3_float_encode_frame,
     .close           = ff_ac3_encode_close,
-    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLT,
+    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
                                                       AV_SAMPLE_FMT_NONE },
     .long_name       = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
     .priv_class      = &ac3enc_class,
diff --git a/libavcodec/ac3enc_template.c b/libavcodec/ac3enc_template.c
index 6e0a2b6f34..388d75377e 100644
--- a/libavcodec/ac3enc_template.c
+++ b/libavcodec/ac3enc_template.c
@@ -65,30 +65,23 @@ alloc_fail:
 
 
 /*
- * Deinterleave input samples.
+ * Copy input samples.
  * Channels are reordered from Libav's default order to AC-3 order.
  */
-static void deinterleave_input_samples(AC3EncodeContext *s,
-                                       const SampleType *samples)
+static void copy_input_samples(AC3EncodeContext *s, SampleType **samples)
 {
-    int ch, i;
+    int ch;
 
-    /* deinterleave and remap input samples */
+    /* copy and remap input samples */
     for (ch = 0; ch < s->channels; ch++) {
-        const SampleType *sptr;
-        int sinc;
-
         /* copy last 256 samples of previous frame to the start of the current frame */
         memcpy(&s->planar_samples[ch][0], &s->planar_samples[ch][AC3_BLOCK_SIZE * s->num_blocks],
                AC3_BLOCK_SIZE * sizeof(s->planar_samples[0][0]));
 
-        /* deinterleave */
-        sinc = s->channels;
-        sptr = samples + s->channel_map[ch];
-        for (i = AC3_BLOCK_SIZE; i < AC3_BLOCK_SIZE * (s->num_blocks + 1); i++) {
-            s->planar_samples[ch][i] = *sptr;
-            sptr += sinc;
-        }
+        /* copy new samples for current frame */
+        memcpy(&s->planar_samples[ch][AC3_BLOCK_SIZE],
+               samples[s->channel_map[ch]],
+               AC3_BLOCK_SIZE * s->num_blocks * sizeof(s->planar_samples[0][0]));
     }
 }
 
@@ -400,7 +393,6 @@ int AC3_NAME(encode_frame)(AVCodecContext *avctx, AVPacket *avpkt,
                            const AVFrame *frame, int *got_packet_ptr)
 {
     AC3EncodeContext *s = avctx->priv_data;
-    const SampleType *samples = (const SampleType *)frame->data[0];
     int ret;
 
     if (s->options.allow_per_frame_metadata) {
@@ -412,7 +404,7 @@ int AC3_NAME(encode_frame)(AVCodecContext *avctx, AVPacket *avpkt,
     if (s->bit_alloc.sr_code == 1 || s->eac3)
         ff_ac3_adjust_frame_size(s);
 
-    deinterleave_input_samples(s, samples);
+    copy_input_samples(s, (SampleType **)frame->extended_data);
 
     apply_mdct(s);
 
diff --git a/libavcodec/eac3enc.c b/libavcodec/eac3enc.c
index c5ba9d6c40..3c7a611e87 100644
--- a/libavcodec/eac3enc.c
+++ b/libavcodec/eac3enc.c
@@ -254,7 +254,7 @@ AVCodec ff_eac3_encoder = {
     .init            = ff_ac3_encode_init,
     .encode2         = ff_ac3_float_encode_frame,
     .close           = ff_ac3_encode_close,
-    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLT,
+    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
                                                       AV_SAMPLE_FMT_NONE },
     .long_name       = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"),
     .priv_class      = &eac3enc_class,