[Ffmpeg-devel] [ bug ] converting png to dv gives solid black

Måns Rullgård mru
Mon Mar 13 20:32:53 CET 2006

Erik Slagter <erik at slagter.name> writes:

> On Mon, 2006-03-13 at 14:28 +0000, M?ns Rullg?rd wrote:
>> > I am sure conventional analogue TV sets can display 30 fps
>> > equally well as 30000/1001 fps.
>> The reason for using 30000/1001 fps remains as long as NTSC TV sets are in use.
>> If 30 fps is used the chroma and audio subcarriers can beat at a multiple of
>> the horizontal scan frequency causing stationary dots in the picture.  If
>> the scan rate is lowered slightly these dots will move around and become less
>> visible.  Then again, maybe modern electronics have better separation of the
>> signals and would cope with 30 fps; I don't know.
> I was thinking of a digital set top box connected properly using a scart

Do you call scart proper?  No, let the French keep that silly
invention along with SECAM.  A scart input has pins for some selection
of RGB, composite and svideo, but never all since they share some
pins.  If your STB happens to use a different flavor of scart than
your TV you'll end up with a B/W picture or even worse things.

> or component cable. No subcarriers applicable then :-) Luckily having an
> analogue TV set doesn't force you to use legacy technology ;-)

I consider any analog connection a legacy technology.

M?ns Rullg?rd
mru at inprovide.com

More information about the ffmpeg-devel mailing list