diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index 11dcf9ce490d54cc5a2c404ff3dbd96486bdfb01..cc650bbd29cda6a4618ce8c678a2fd9dc8f57fe2 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -1203,7 +1203,7 @@ static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
 
 int ff_check_h264_startcode(AVFormatContext *s, const AVStream *st, const AVPacket *pkt)
 {
-    if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
+    if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001 && AV_RB24(pkt->data) != 0x000001) {
         if (!st->nb_frames) {
             av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
                    "no startcode found, use the video bitstream filter 'h264_mp4toannexb' to fix it "