#7702: Incorrect video frame reporting
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Reporter: budman1 | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: unspecified | undetermined
Keywords: | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Comment (by budman1):
Updating to ffmpeg version N-93022-g260f1960e7 solved player problem but
still extracts wrong frame
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create Blank clip, no sound:
BlankClip(length=3600, width=640, height=480, fps=30, color=$000000)
create blank clip (GOP=50, FPS=30)with Frame type, Frame number and time
embedded using Avisynth and FFMpeg:
Avisynth script (test.avs):
FFmpegSource2("C:\Users\Bud\Desktop\G50_30_Test
Pattern.mp4").Crop(0,0,-0,-0).LanczosResize(640,480)
ScriptClip(Last, """Subtitle("[ "+Chr(FFPICT_TYPE)+" ]",
size=(Height*56.0/720), align=2)""", after_frame=true)
Subtitle("Test_Pattern.mp4", x=295, y=240, font="Arial", size=24,
text_color=$ff0000, align=3)
ShowFrameNumber(scroll=true, x=10, y=27, font="Arial", size=24,
text_color=$ffff80)
ShowTime(x=72, y=44, font="Arial", size=24, text_color=$ffff80)
ShowSMPTE(fps=25, x=68, y=61, font="Arial", size=24, text_color=$ffff80)
FFMpeg script:
ffmpeg -i test.avs -an -c:v libx264 -crf 22 -g 50 -r 30
"G50_30_Test_Pattern.mp4"
Cut at frame 1848 (I-Frame with new file frame 0 dts 0.06616, 1st cut):
ffmpeg -i "G50_30_Test_Pattern.mp4" -ss 61.600000 -vframes 1750 -c:v copy
-c:a copy -y "C:\Users\Bud\Desktop\1852\G50_30_Test_Pattern_First.mp4"
check dts/pts (gives dts time 0.066016):
ffprobe -i "C:\Users\Bud\Desktop\G50_30_Test_Pattern_First.mp4" -v quiet
-select_streams v -show_frames -show_entries frame=pkt_pts_time
-read_intervals %+6 -of csv
In order to get 0.000000 dts (dts * 0.667 = 0.044033)
ffmpeg -nostats -loglevel 0 -ss 0.044033 -i
"C:\Users\Bud\Desktop\G50_30_Test_Pattern_First.mp4" -vframes 1750 -c:v
copy -c:a copy -y "C:\Users\Bud\Desktop\G50_30_Test_Pattern_Final.mp4"
Check dts/pts (gives dts time 0.000000):
ffprobe -i "C:\Users\Bud\Desktop\G50_30_Test_Pattern_Final.mp4" -v quiet
-select_streams v -show_frames -show_entries frame=pkt_pts_time
-read_intervals %+6 -of csv
ffplay script to view (see final_ffplay.jpg):
DirectShowSource("C:\Users\Bud\Desktop\1852\G50_30_Test_Pattern_Final.mp4").Crop(0,
0, -0, -0)x = float(Width) / float(Height)
last.LanczosResize(round(x * 480.0 / 4.0) * 4, 480).trim(0, -1750)
ShowFrameNumber(offset=0,scroll=true, x=10, y=127, font="Arial", size=24,
text_color=$ffff80)
ShowTime(offset_f=0,x=72, y=144, font="Arial", size=24,
text_color=$ffff80)
extract first frame as xxx.jpg (final_1st_frame.jpg):
ffmpeg -i "C:\Users\Bud\Desktop\1852\G50_30_Test_Pattern_Final.mp4" -ss
0.000000 -f image2 -q:v 1 -vf
scale=640:-2,"drawtext=fontfile=c:/Windows/Fonts/Arial.ttf:text='0.000000':fontsize=30:box=1:x=(w-tw)/2:y=h-(2*lh),drawtext=fontfile=c:/Windows/Fonts/Arial.ttf:text='0:1':fontsize=30:box=1:x=(w-tw)/2:y=h-(2*lh)-30"
-vframes 1 -y
"C:\Users\Bud\Desktop\TrimNMerge\TrimNMerge\bin\Debug\work\Thumb_1.jpg
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Ticket URL: <https://trac.ffmpeg.org/ticket/7702#comment:2>
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