On Mon, 3 Jul 2017, Aaron Levinson wrote:
On 7/3/2017 1:06 PM, Marton Balint wrote:
On Mon, 3 Jul 2017, Aaron Levinson wrote:
+22, and lines 318 to 335. Line 6 is the LSB in the mask. Selected lines
which
+do not contain teletext information will be ignored. You can use the
special
+@option{all} constant to select all possible lines, or
@option{standard}
to
+skip lines 6, 318 and 319, which are not compatible with all receivers.
+
+For SD sources ffmpeg needs to be compiled with
@code{--enable-libzvbi}.
For HD
+sources on older (pre-4K) DeckLink card models you have to capture
in 10
bit
+mode.
Would be good to indicate that the bit mask is ignored for HD sources.
Actually it is not. Any HD line can contain an OP47 packet referencing
any SD line, the bitmask is checked against the decoded source line
number from OP47.
The documentation indicates that both SD PAL and HD sources are
supported, but an examination of the changes indicates that only some
HD sources are supported. Specifically, for HD sources to work, it
expects a width of 1920. This would cover both 1080i and 1080p, but
it doesn't cover 720p, with is also an HD video mode. My guess is
that the code has probably only been tested with 1080i as well, and in
that case, it would make sense to only specify 1080i in the
documentation. Further, since the original code only supports SD PAL,
I would suspect that the latest code has only been tested using "PAL"
frame rates at 1080i, i.e. 1080i50. If it is unclear if the code will
also work with 1080i59.94 and 1080i60, then it would be best to only
support 1080i50.
1080i/p/59.94/60 should work all the same. For 720p different VANC lines
might be needed. I will change the HD references to "Full HD" so it will
be more clear.
Searching for "full HD" tends to indicate that term is usually
associated with 1080p but not with 720p nor 1080i (for example, at
http://www.pcmag.com/article2/0,2817,2413044,00.asp ). I think it would
be clearer to call out the specific video modes that are supported.
I disagree. Full HD is resolution, not fps. Anybody working with
interlaced signals will know that full HD means both progressive and
interlaced here.
Regards,
Marton
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