How to make measurement outcome written into file?

[Bencuri]

I want to have the results from this measurement be written into a file but it does not work. The file is created but is empty:

frame1 = src.Crop(1100, 590, 100, 250)
frame1.WriteFile ( "C:\avisynth\frame1_stats.txt", "Y_avg=", "AverageLuma", flush=true)

[lollo]

As a very basic ouput generation, sometimes I use something like:

video_org=AviSource("C:\Users\giuse\Videos\Acquisizioni\ufo_s1a_amtv.avi")

# trimming
	trim_start=345
	trim_end=68946
video_org_trim=video_org.trim(trim_start,trim_end)

# cropping 
	crop_left=8	# | rimozione esatta delle bande nere sinistra, sopra, destra e del disturbo sotto	
	crop_top=8	# | 720-(8+24)x576-(8+8)=688x560
	crop_right=24
	crop_bottom=8
video_org_trim_crop=video_org_trim.crop(crop_left,crop_top,-crop_right,-crop_bottom)

# convert to YV12 (required for Y statistics)
video_org_trim_crop_yv12=video_org_trim_crop.ConvertToYV12(interlaced=false)

# analysis
video_coloryuv=video_org_trim_crop_yv12.\
WriteFile("ufo_s1a_amtv_step1a.txt", "current_frame", """ "  " """,\
"AverageLuma()", """ "  " """, "YPlaneMin()", """ "  " """, "YPlaneMax()", """ "  " """,\
"YPlaneMin(threshold=0.4)", """ "  " """, "YPlaneMax(threshold=0.4)", append=false).\
ColorYUV(analyze=true)

eval("video_coloryuv")

and it works. Hope it helps

[jagabo]

Did you preview the script (ie, run it through it's entirety)? WriteFile is a runtime filter it doesn't act on a frame until that frame has been loaded. Try loading the script into VirtualDub then selecting File -> Run Video Analysis Pass. When it's done, check your text file.

[lollo]

Yes, jagabo, good point. The "script" must be run once loaded in VirtualDub, or must contain RT procedures (RT_ForceProcess or similar)

[Bencuri]

Did you preview the script (ie, run it through it's entirety)? WriteFile is a runtime filter it doesn't act on a frame until that frame has been loaded. Try loading the script into VirtualDub then selecting File -> Run Video Analysis Pass. When it's done, check your text file.

I added the script to AvsPmod and pressed play.

[jagabo]

Change the WriteFile line to:

frame1.WriteFile ( "C:\avisynth\frame1_stats.txt", """ "Y_avg=" """, "AverageLuma", flush=true)

[Bencuri]

Change the WriteFile line to:

frame1.WriteFile ( "C:\avisynth\frame1_stats.txt", """ "Y_avg=" """, "AverageLuma", flush=true)

It tried this it creates the file but sill empty.

[jagabo]

Worked for me with AviSynth+, version 3.7.5. I used VirtualDub2 to run the script with File -> Run Video Analysis Pass.

# after opening a 10 frame YUV video
WriteFile("stats.txt", """ "frame number = " """, "current_frame", """ ", Y_avg = " """, "AverageLuma", append=false, flush=true)

frame number = 0, Y_avg = 95.732292
frame number = 0, Y_avg = 95.732292
frame number = 1, Y_avg = 95.732292
frame number = 2, Y_avg = 95.732292
frame number = 3, Y_avg = 95.732292
frame number = 4, Y_avg = 95.732292
frame number = 5, Y_avg = 95.732292
frame number = 6, Y_avg = 95.732292
frame number = 7, Y_avg = 95.732292
frame number = 8, Y_avg = 95.732292
frame number = 9, Y_avg = 95.732292

Note that frame 0 is reported twice because opening the script in VirtualDub process the first frame and shows it. Then File -> Run... processes the entire video, including the first frame again.

Also note that the video I was testing with was a still test pattern. So all frames had the same average luma.

[Bencuri]

Worked for me with AviSynth+, version 3.7.5. I used VirtualDub2 to run the script with File -> Run Video Analysis Pass.

# after opening a 10 frame YUV video
WriteFile("stats.txt", """ "frame number = " """, "current_frame", """ ", Y_avg = " """, "AverageLuma", append=false, flush=true)

frame number = 0, Y_avg = 95.732292
frame number = 0, Y_avg = 95.732292
frame number = 1, Y_avg = 95.732292
frame number = 2, Y_avg = 95.732292
frame number = 3, Y_avg = 95.732292
frame number = 4, Y_avg = 95.732292
frame number = 5, Y_avg = 95.732292
frame number = 6, Y_avg = 95.732292
frame number = 7, Y_avg = 95.732292
frame number = 8, Y_avg = 95.732292
frame number = 9, Y_avg = 95.732292

Note that frame 0 is reported twice because opening the script in VirtualDub process the first frame and shows it. Then File -> Run... processes the entire video, including the first frame again.

Also note that the video I was testing with was a still test pattern. So all frames had the same average luma.

Okay I try it with Virtual Dub then. LEt's see if that is different.