diff --git a/ffmpeg.c b/ffmpeg.c
index 798af27a75681a185214ef485b9ceb53de7d6383..25604d7e9c0d98114d250ec4dd8d8bd7dfcc04fc 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -3465,7 +3465,7 @@ static void opt_video_bsf(const char *arg)
     AVBitStreamFilterContext **bsfp;
 
     if(!bsfc){
-        fprintf(stderr, "Unkown bitstream filter %s\n", arg);
+        fprintf(stderr, "Unknown bitstream filter %s\n", arg);
         exit(1);
     }
 
@@ -3483,7 +3483,7 @@ static void opt_audio_bsf(const char *arg)
     AVBitStreamFilterContext **bsfp;
 
     if(!bsfc){
-        fprintf(stderr, "Unkown bitstream filter %s\n", arg);
+        fprintf(stderr, "Unknown bitstream filter %s\n", arg);
         exit(1);
     }
 
diff --git a/libavcodec/flicvideo.c b/libavcodec/flicvideo.c
index 43a6f26dd6a8301ecdea0f7719762f8439f7d7eb..b60e0b1c236bc9948c1678b9463ebc4f111d35a6 100644
--- a/libavcodec/flicvideo.c
+++ b/libavcodec/flicvideo.c
@@ -115,7 +115,7 @@ static int flic_decode_init(AVCodecContext *avctx)
                   return -1;
                   break;
         default :
-                  av_log(avctx, AV_LOG_ERROR, "Unkown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
+                  av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
                   return -1;
     }
 
diff --git a/libavformat/vocdec.c b/libavformat/vocdec.c
index 21ef8c2071c07703af3dfb32ca80f251895fec64..bc9205faa0e71c1e2f3ea7560508bae73e71a268 100644
--- a/libavformat/vocdec.c
+++ b/libavformat/vocdec.c
@@ -51,7 +51,7 @@ static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap)
     url_fskip(pb, 20);
     header_size = get_le16(pb) - 22;
     if (header_size != 4) {
-        av_log(s, AV_LOG_ERROR, "unkown header size: %d\n", header_size);
+        av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size);
         return AVERROR_NOTSUPP;
     }
     url_fskip(pb, header_size);