avfilter/libvmaf: mention csv as available log format

Signed-off-by: Harry Mallon <harry.mallon@codex.online>
Signed-off-by: Gyan Doshi <ffmpeg@gyani.pro>

doc/filters.texi

@@ -12870,7 +12870,7 @@ Default value: @code{"/usr/local/share/model/vmaf_v0.6.1.pkl"}
 Set the file path to be used to store logs.
 
 @item log_fmt
-Set the format of the log file (xml or json).
+Set the format of the log file (csv, json or xml).
 
 @item enable_transform
 This option can enable/disable the @code{score_transform} applied to the final predicted VMAF score,

libavfilter/vf_libvmaf.c

@@ -74,7 +74,7 @@ typedef struct LIBVMAFContext {
 static const AVOption libvmaf_options[] = {
     {"model_path",  "Set the model to be used for computing vmaf.",                     OFFSET(model_path), AV_OPT_TYPE_STRING, {.str="/usr/local/share/model/vmaf_v0.6.1.pkl"}, 0, 1, FLAGS},
     {"log_path",  "Set the file path to be used to store logs.",                        OFFSET(log_path), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 1, FLAGS},
-    {"log_fmt",  "Set the format of the log (xml or json).",                            OFFSET(log_fmt), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 1, FLAGS},
+    {"log_fmt",  "Set the format of the log (csv, json or xml).",                       OFFSET(log_fmt), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 1, FLAGS},
     {"enable_transform",  "Enables transform for computing vmaf.",                      OFFSET(enable_transform), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
     {"phone_model",  "Invokes the phone model that will generate higher VMAF scores.",  OFFSET(phone_model), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
     {"psnr",  "Enables computing psnr along with vmaf.",                                OFFSET(psnr), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},