Replace incorrect use of "multiply" with "multiple"

Also replace the plural form "multiplies" with "multiples".

doc/fftools-common-opts.texi

@@ -3,7 +3,7 @@ representing a number as input, which may be followed by one of the SI
 unit prefixes, for example: 'K', 'M', or 'G'.
 
 If 'i' is appended to the SI unit prefix, the complete prefix will be
-interpreted as a unit prefix for binary multiplies, which are based on
+interpreted as a unit prefix for binary multiples, which are based on
 powers of 1024 instead of powers of 1000. Appending 'B' to the SI unit
 prefix multiplies the value by 8. This allows using, for example:
 'KB', 'MiB', 'G' and 'B' as number suffixes.

libavcodec/dirac.c

@@ -239,7 +239,7 @@ static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
     avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format];
     avcodec_get_chroma_sub_sample(avctx->pix_fmt, &chroma_x_shift, &chroma_y_shift);
     if ((source->width % (1<<chroma_x_shift)) || (source->height % (1<<chroma_y_shift))) {
-        av_log(avctx, AV_LOG_ERROR, "Dimensions must be a integer multiply of the chroma subsampling\n");
+        av_log(avctx, AV_LOG_ERROR, "Dimensions must be an integer multiple of the chroma subsampling\n");
         return AVERROR_INVALIDDATA;
     }
 

libavcodec/mpeg12enc.c

@@ -199,7 +199,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
 
     if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
         if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
-            av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiplies of 4096\n"
+            av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiples of 4096\n"
                                         "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
             return AVERROR(EINVAL);
         }

libavcodec/msvideo1enc.c

@@ -266,7 +266,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
         return -1;
     }
     if((avctx->width&3) || (avctx->height&3)){
-        av_log(avctx, AV_LOG_ERROR, "width and height must be multiplies of 4\n");
+        av_log(avctx, AV_LOG_ERROR, "width and height must be multiples of 4\n");
         return -1;
     }
 

libavutil/frame.h

@@ -162,7 +162,7 @@ typedef struct AVFrame {
      * For audio, only linesize[0] may be set. For planar audio, each channel
      * plane must be the same size.
      *
-     * For video the linesizes should be multiplies of the CPUs alignment
+     * For video the linesizes should be multiples of the CPUs alignment
      * preference, this is 16 or 32 for modern desktop CPUs.
      * Some code requires such alignment other code can be slower without
      * correct alignment, for yet other it makes no difference.