Andy Furniss wrote:
MrNice wrote:
To confirm I have an interlaced USB video, I tried
./ffmpeg -debug 1 -f v4l2 -ts mono2abs -channel 1 -video_size
720x576 -pix_fmt yuyv422 -thread_queue_size 512 -i /dev/video0
-c:v libx264 -preset slow -qp 0 -flags +ilme+ildct -aspect 4:3
-pix_fmt yuv422p
This doesn't confirm v4l passes interlaced flags as it seems -flags
+ilme+ildct tells libx264 to encode as interlaced. It seems to
default to tff - so it's only luck if it works = source was really
tff.
I wasn't testing with v4l, it was a yuyv422 interlaced file (in avi
flagged as progressive).
for me the output was identical using -flags +ilme+ildct or
-x264opts tff=1 (used .mp4 to md5sum as mkv never md5sums the same
due to guid).
The latter of course allowing easily to change to bff-1 as required,
though I guess there are many ways in practice.
Hmm, well, ffprobe -show_frames always shows top_field_first=0 for both
mkv and mp4 even if x264 parameters show "interlaced=tff".
mediainfo calls tff/bff OK - but I don't know what that is looking at.
I have to additionally use -vf setfield=tff to get ffprobe to show
top_field_first=1
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