avconv: rename sameq to same_quant

It's often mistakenly used as 'same quality', emphasize that it's not
true in the manual.

avconv.c

@@ -140,7 +140,7 @@ static int video_disable = 0;
 static int video_discard = 0;
 static unsigned int video_codec_tag = 0;
 static char *video_language = NULL;
-static int same_quality = 0;
+static int same_quant = 0;
 static int do_deinterlace = 0;
 static int top_field_first = -1;
 static int me_threshold = 0;
@@ -1294,7 +1294,7 @@ static void do_video_out(AVFormatContext *s,
                     big_picture.top_field_first = top_field_first;
             }
 
-            /* handles sameq here. This is not correct because it may
+            /* handles same_quant here. This is not correct because it may
                not be a global option */
             big_picture.quality = quality;
             if(!me_threshold)
@@ -1612,7 +1612,7 @@ static int output_packet(InputStream *ist, int ist_index,
 
                     ret = avcodec_decode_video2(ist->st->codec,
                                                 &picture, &got_output, &avpkt);
-                    quality = same_quality ? picture.quality : 0;
+                    quality = same_quant ? picture.quality : 0;
                     if (ret < 0)
                         return ret;
                     if (!got_output) {
@@ -1738,7 +1738,7 @@ static int output_packet(InputStream *ist, int ist_index,
                                 ost->st->codec->sample_aspect_ratio = ost->picref->video->pixel_aspect;
 #endif
                             do_video_out(os, ost, ist, &picture, &frame_size,
-                                         same_quality ? quality : ost->st->codec->global_quality);
+                                         same_quant ? quality : ost->st->codec->global_quality);
                             if (vstats_filename && frame_size)
                                 do_video_stats(os, ost, frame_size);
                             break;
@@ -3239,7 +3239,7 @@ static OutputStream *new_video_stream(AVFormatContext *oc, int file_idx)
 
         if (intra_only)
             video_enc->gop_size = 0;
-        if (video_qscale || same_quality) {
+        if (video_qscale || same_quant) {
             video_enc->flags |= CODEC_FLAG_QSCALE;
             video_enc->global_quality = FF_QP2LAMBDA * video_qscale;
         }
@@ -4085,7 +4085,7 @@ static const OptionDef options[] = {
     { "rc_override", HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)opt_video_rc_override_string}, "rate control override for specific intervals", "override" },
     { "vcodec", HAS_ARG | OPT_VIDEO, {(void*)opt_video_codec}, "force video codec ('copy' to copy stream)", "codec" },
     { "me_threshold", HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)opt_me_threshold}, "motion estimaton threshold",  "threshold" },
-    { "sameq", OPT_BOOL | OPT_VIDEO, {(void*)&same_quality},
+    { "same_quant", OPT_BOOL | OPT_VIDEO, {(void*)&same_quant},
       "use same quantizer as source (implies VBR)" },
     { "pass", HAS_ARG | OPT_VIDEO, {(void*)opt_pass}, "select the pass number (1 or 2)", "n" },
     { "passlogfile", HAS_ARG | OPT_STRING | OPT_VIDEO, {(void*)&pass_logfilename_prefix}, "select two pass log file name prefix", "prefix" },

doc/avconv.texi

@@ -308,9 +308,12 @@ It is of little use elsewise.
 Set video buffer verifier buffer size (in bits).
 @item -vcodec @var{codec}
 Set the video codec. This is an alias for @code{-codec:v}.
-@item -sameq
+@item -same_quant
 Use same quantizer as source (implies VBR).
 
+Note that this is NOT SAME QUALITY. Do not use this option unless you know you
+need it.
+
 @item -pass @var{n}
 Select the pass number (1 or 2). It is used to do two-pass
 video encoding. The statistics of the video are recorded in the first
@@ -848,11 +851,6 @@ To have a constant quality (but a variable bitrate), use the option
 '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
 quality).
 
-@item
-When converting video files, you can use the '-sameq' option which
-uses the same quality factor in the encoder as in the decoder.
-It allows almost lossless encoding.
-
 @end itemize
 @c man end TIPS
 

tests/codec-regression.sh

@@ -58,7 +58,7 @@ do_video_decoding
 
 # mpeg2 encoding interlaced
 file=${outfile}mpeg2reuse.mpg
-do_avconv $file $DEC_OPTS -me_threshold 256 -i ${target_path}/${outfile}mpeg2thread.mpg $ENC_OPTS -sameq -me_threshold 256 -mb_threshold 1024 -vcodec mpeg2video -f mpeg1video -bf 2 -flags +ildct+ilme -threads 4
+do_avconv $file $DEC_OPTS -me_threshold 256 -i ${target_path}/${outfile}mpeg2thread.mpg $ENC_OPTS -same_quant -me_threshold 256 -mb_threshold 1024 -vcodec mpeg2video -f mpeg1video -bf 2 -flags +ildct+ilme -threads 4
 do_video_decoding
 fi