Opened 2 years ago

Closed 19 months ago

#8887 closed defect (needs_more_info)

Weird vertical stripes

Reported by: Michael Heuberger Owned by:
Priority: normal Component: undetermined
Version: unspecified Keywords:
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no


Looks like a bug. Any ideas why ffmpeg encoded like this? See attached image.

Trying to generate two videos in one go (MP4 and WebM) based on image frames with this long command:

ffmpeg -f image2 -thread_queue_size 4096 -framerate 20.0 
-i ./frames/%d.webp -y -an 
-vcodec libx264 
-filter:v scale=trunc(iw/2)*2:trunc(ih/2)*2,hflip,drawtext=fontfile=./fonts/Varela-Regular.ttf:text=test-video:fontsize=14:fontcolor=0xFFFFFF@0.6:x=text_h/1.5:y=main_h-(text_h*2):shadowcolor=0x111111@0.6:shadowx=1:shadowy=1 
-crf 18 -pix_fmt yuv420p -preset medium -profile:v baseline 
-level:v 3.1 -movflags +faststart ./video_good.mp4 
-vcodec libvpx 
-filter:v scale=trunc(iw/2)*2:trunc(ih/2)*2,hflip,drawtext=fontfile=./Varela-Regular.ttf:text=test-video:fontsize=14:fontcolor=0xFFFFFF@0.6:x=text_h/1.5:y=main_h-(text_h*2):shadowcolor=0x111111@0.6:shadowx=1:shadowy=1 
-crf 4 -pix_fmt yuv420p -deadline good -cpu-used 1 
-loglevel warning ./video_good.webm

Does it look like a bug? I cannot always reproduce it and only seems to happen from some images generated from some webcam models of my visitors.

Not sure, could be something else. Thanks.

Attachments (1)

Screen Shot 2020-09-08 at 09.28.47.png (22.4 KB ) - added by Michael Heuberger 2 years ago.

Download all attachments as: .zip

Change History (4)

by Michael Heuberger, 2 years ago

comment:1 by mkver, 2 years ago

Does "I cannot always reproduce it" mean that it does happen sometimes and sometimes not with the same input image sequence or that it only happens with some input image sequences, but not with others? In any case, please share such an image sequence even when the problem occurs only randomly.

comment:2 by Michael Heuberger, 2 years ago

@mkver sorry, to be precise, I don't have the images on my side. It's a web app and only happens for some users. I do not have the image frames on my side.

Maybe you have a guess what it could be or find any problems with the above command? Or it is a known bug?

comment:3 by Carl Eugen Hoyos, 19 months ago

Resolution: needs_more_info
Status: newclosed
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