diff --git a/libavcodec/aptx.c b/libavcodec/aptx.c
index 8e110acc97..ed814ad1c0 100644
--- a/libavcodec/aptx.c
+++ b/libavcodec/aptx.c
@@ -516,15 +516,6 @@ av_cold int ff_aptx_init(AVCodecContext *avctx)
     s->hd = avctx->codec->id == AV_CODEC_ID_APTX_HD;
     s->block_size = s->hd ? 6 : 4;
 
-    if (avctx->frame_size == 0)
-        avctx->frame_size = 256 * s->block_size;
-
-    if (avctx->frame_size % s->block_size) {
-        av_log(avctx, AV_LOG_ERROR,
-               "Frame size must be a multiple of %d samples\n", s->block_size);
-        return AVERROR(EINVAL);
-    }
-
     for (chan = 0; chan < NB_CHANNELS; chan++) {
         Channel *channel = &s->channels[chan];
         for (subband = 0; subband < NB_SUBBANDS; subband++) {
diff --git a/libavcodec/aptxenc.c b/libavcodec/aptxenc.c
index f9347853d2..434a9abf0f 100644
--- a/libavcodec/aptxenc.c
+++ b/libavcodec/aptxenc.c
@@ -257,6 +257,9 @@ static av_cold int aptx_encode_init(AVCodecContext *avctx)
 
     ff_af_queue_init(avctx, &s->afq);
 
+    if (!avctx->frame_size || avctx->frame_size % 4)
+        avctx->frame_size = 1024;
+
     return ff_aptx_init(avctx);
 }