[FFmpeg-user] Capture from USB Dazzle: Interlaced or not interlaced. FFV1 level3 vs h264

Carl Eugen Hoyos cehoyos at ag.or.at
Thu Oct 29 18:49:45 CET 2015

MrNice <wxcvbn2006 <at> iol.ie> writes:

> When I capture some video with the CL
> ./ffmpeg -debug 1 -f v4l2 -ts mono2abs -channel 1 
> -video_size 720x576 -pix_fmt yuyv422 -thread_queue_size 512 
> -i /dev/video0 -c:v ffv1 -level 3 -g 1 -aspect 4:3 
> -pix_fmt yuv422p /Store3/Test/t_`date +%Y%m%d_%H%M`.mkv 
> -aspect 4:3 -f sdl "Dazzle output"

> from a S-VHS tape and Dazzle DVC100, I was thinking to 
> get an interlaced video file.

I mean: How is FFmpeg (or the FFV1 encoder) supposed to know 
that your v4l input is interlaced? (And why shouldn't your 
S-VHS recording be low-resolution progressive?)
Maybe I miss something but in this case please explain.

Doesn't removing "-flags +ilme+ildct" from your h264 
command line produces the same output wrt interlacing 
as above command line?
Doesn't adding it to the ffv1 command line solve your 

Carl Eugen

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