diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 2e8a86c1fa..bfd470b24e 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -864,7 +864,6 @@ int attribute_align_arg avcodec_encode_audio2(AVCodecContext *avctx,
 {
     int ret;
     int user_packet = !!avpkt->data;
-    int nb_samples;
 
     *got_packet_ptr = 0;
 
@@ -877,19 +876,15 @@ int attribute_align_arg avcodec_encode_audio2(AVCodecContext *avctx,
 
     /* check for valid frame size */
     if (frame) {
-        nb_samples = frame->nb_samples;
         if (avctx->codec->capabilities & CODEC_CAP_SMALL_LAST_FRAME) {
-            if (nb_samples > avctx->frame_size)
+            if (frame->nb_samples > avctx->frame_size)
                 return AVERROR(EINVAL);
         } else if (!(avctx->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)) {
-            if (nb_samples != avctx->frame_size)
+            if (frame->nb_samples != avctx->frame_size)
                 return AVERROR(EINVAL);
         }
-    } else {
-        nb_samples = avctx->frame_size;
     }
 
-    if (avctx->codec->encode2) {
         ret = avctx->codec->encode2(avctx, avpkt, frame, got_packet_ptr);
         if (!ret && *got_packet_ptr) {
             if (!(avctx->codec->capabilities & CODEC_CAP_DELAY)) {
@@ -903,68 +898,7 @@ int attribute_align_arg avcodec_encode_audio2(AVCodecContext *avctx,
         } else {
             avpkt->size = 0;
         }
-    } else {
-        /* for compatibility with encoders not supporting encode2(), we need to
-           allocate a packet buffer if the user has not provided one or check
-           the size otherwise */
-        int fs_tmp   = 0;
-        int buf_size = avpkt->size;
-        if (!user_packet) {
-            if (avctx->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE) {
-                av_assert0(av_get_bits_per_sample(avctx->codec_id) != 0);
-                buf_size = nb_samples * avctx->channels *
-                           av_get_bits_per_sample(avctx->codec_id) / 8;
-            } else {
-                /* this is a guess as to the required size.
-                   if an encoder needs more than this, it should probably
-                   implement encode2() */
-                buf_size = 2 * avctx->frame_size * avctx->channels *
-                           av_get_bytes_per_sample(avctx->sample_fmt);
-                buf_size += FF_MIN_BUFFER_SIZE;
-            }
-        }
-        if ((ret = ff_alloc_packet(avpkt, buf_size)))
-            return ret;
 
-        /* Encoders using AVCodec.encode() that support
-           CODEC_CAP_SMALL_LAST_FRAME require avctx->frame_size to be set to
-           the smaller size when encoding the last frame.
-           This code can be removed once all encoders supporting
-           CODEC_CAP_SMALL_LAST_FRAME use encode2() */
-        if ((avctx->codec->capabilities & CODEC_CAP_SMALL_LAST_FRAME) &&
-            nb_samples < avctx->frame_size) {
-            fs_tmp = avctx->frame_size;
-            avctx->frame_size = nb_samples;
-        }
-
-        /* encode the frame */
-        ret = avctx->codec->encode(avctx, avpkt->data, avpkt->size,
-                                   frame ? frame->data[0] : NULL);
-        if (ret >= 0) {
-            if (!ret) {
-                /* no output. if the packet data was allocated by libavcodec,
-                   free it */
-                if (!user_packet)
-                    av_freep(&avpkt->data);
-            } else {
-                if (avctx->coded_frame)
-                    avpkt->pts = avpkt->dts = avctx->coded_frame->pts;
-                /* Set duration for final small packet. This can be removed
-                   once all encoders supporting CODEC_CAP_SMALL_LAST_FRAME use
-                   encode2() */
-                if (fs_tmp) {
-                    avpkt->duration = ff_samples_to_time_base(avctx,
-                                                              avctx->frame_size);
-                }
-            }
-            avpkt->size = ret;
-            *got_packet_ptr = (ret > 0);
-            ret = 0;
-        }
-
-        if (fs_tmp)
-            avctx->frame_size = fs_tmp;
-    }
     if (!ret) {
         if (!user_packet && avpkt->size) {
             uint8_t *new_data = av_realloc(avpkt->data, avpkt->size);