Fix "bistream" typo and add a check in tools/patcheck.

doc/ffmpeg.texi

@@ -914,7 +914,7 @@ ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
 @end example
 
 @item -bsf[:@var{stream_specifier}] @var{bitstream_filters} (@emph{output,per-stream})
-Set bitstream filters for matching streams. @var{bistream_filters} is
+Set bitstream filters for matching streams. @var{bitstream_filters} is
 a comma-separated list of bitstream filters. Use the @code{-bsfs} option
 to get the list of bitstream filters.
 @example

doc/libavcodec.texi

@@ -27,7 +27,7 @@ implementing robust and fast codecs as well as for experimentation.
 
 @c man begin SEEALSO
 ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), ffmpeg-codecs(1),
-ffmpeg-bistream-filters(1), libavutil(3)
+ffmpeg-bitstream-filters(1), libavutil(3)
 @c man end
 
 @c man begin AUTHORS

libavcodec/h263dec.c

@@ -709,7 +709,7 @@ retry:
 
     av_assert1(s->bitstream_buffer_size==0);
 frame_end:
-    /* divx 5.01+ bistream reorder stuff */
+    /* divx 5.01+ bitstream reorder stuff */
     if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
         int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
         int startcode_found=0;

libavcodec/rv34.c

@@ -215,7 +215,7 @@ static int rv34_decode_cbp(GetBitContext *gb, RV34VLC *vlc, int table)
 }
 
 /**
- * Get one coefficient value from the bistream and store it.
+ * Get one coefficient value from the bitstream and store it.
  */
 static inline void decode_coeff(DCTELEM *dst, int coef, int esc, GetBitContext *gb, VLC* vlc, int q)
 {

libavcodec/vda_h264.c

@@ -285,7 +285,7 @@ int ff_vda_create_decoder(struct vda_context *vda_ctx,
     pthread_mutex_init(&vda_ctx->queue_mutex, NULL);
 #endif
 
-    /* Each VCL NAL in the bistream sent to the decoder
+    /* Each VCL NAL in the bitstream sent to the decoder
      * is preceded by a 4 bytes length header.
      * Change the avcC atom header if needed, to signal headers of 4 bytes. */
     if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {

libavformat/flvenc.c

@@ -494,7 +494,7 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
     } else if (enc->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
                (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
         av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
-               "use audio bistream filter 'aac_adtstoasc' to fix it "
+               "use audio bitstream filter 'aac_adtstoasc' to fix it "
                "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
         return AVERROR_INVALIDDATA;
     }

tools/patcheck

@@ -67,7 +67,7 @@ $EGREP $OPT '^\+ *(const *|)static' $*| $EGREP --color=always '[^=]= *(0|NULL)[^
 cat $TMP
 hiegrep '# *ifdef * (HAVE|CONFIG)_' 'ifdefs that should be #if' $*
 
-hiegrep '\b(awnser|cant|dont|wont|usefull|successfull|occured|teh|alot|wether|skiped|skiping|heigth|informations|colums|loosy|loosing|ouput|seperate|preceed|upto|paket|posible|unkown|inpossible|dimention|acheive|funtions|overriden|outputing|seperation|initalize|compatibilty)\b' 'common typos' $*
+hiegrep '\b(awnser|cant|dont|wont|usefull|successfull|occured|teh|alot|wether|skiped|skiping|heigth|informations|colums|loosy|loosing|ouput|seperate|preceed|upto|paket|posible|unkown|inpossible|dimention|acheive|funtions|overriden|outputing|seperation|initalize|compatibilty|bistream)\b' 'common typos' $*
 
 hiegrep 'av_log\( *NULL' 'Missing context in av_log' $*
 hiegrep '[^sn]printf' 'Please use av_log' $*