id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc
3688,gdalwarp -multi outputs duplicated progress bar for some images,rouault,rouault,"In 90% of the runs of :

{{{
gdalwarp korea_high_res.tif korea_out.tif -multi -wm 800 -co TILED=YES
}}}

with the following image :

{{{
Driver: GTiff/GeoTIFF
Files: korea_high_res.tif
Size is 33554, 17476
Coordinate System is:
GEOGCS[""WGS 84"",
    DATUM[""WGS_1984"",
        SPHEROID[""WGS 84"",6378137,298.257223563,
            AUTHORITY[""EPSG"",""7030""]],
        AUTHORITY[""EPSG"",""6326""]],
    PRIMEM[""Greenwich"",0],
    UNIT[""degree"",0.0174532925199433],
    AUTHORITY[""EPSG"",""4326""]]
Origin = (126.179995536804199,36.150040626525879)
Pixel Size = (0.000042915344238,-0.000042915344238)
Metadata:
  AREA_OR_POINT=Area
Image Structure Metadata:
  INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left  ( 126.1799955,  36.1500406) (126d10'47.98""E, 36d 9'0.15""N)
Lower Left  ( 126.1799955,  35.4000521) (126d10'47.98""E, 35d24'0.19""N)
Upper Right ( 127.6199770,  36.1500406) (127d37'11.92""E, 36d 9'0.15""N)
Lower Right ( 127.6199770,  35.4000521) (127d37'11.92""E, 35d24'0.19""N)
Center      ( 126.8999863,  35.7750463) (126d53'59.95""E, 35d46'30.17""N)
Band 1 Block=256x256 Type=Byte, ColorInterp=Red
Band 2 Block=256x256 Type=Byte, ColorInterp=Green
Band 3 Block=256x256 Type=Byte, ColorInterp=Blue
}}}

I get the following output :

{{{
Creating output file that is 33554P x 17476L.
Processing input file korea_high_res.tif.
0...10...20...30...40...50...60...70...80...90...100 - done.
0...10...20...30...40...50...60...70...80...90...100 - done.
}}}

The reason is that the progress base and scale value were stored by the warp operation object (that is shared by the 2 worker threads) and set at the creation of the thread. So in some cases depending on when threads starts & ends, the (n-1)th thread instance could get the progress info of the (n)th thread",defect,closed,normal,1.8.0,Algorithms,unspecified,normal,fixed,,