On 2019-03-08 10:05 a.m., Venkateswaran.S wrote:
Hi,
I'm using libavfilter to detect black frame in my video. I followed this
example https://ffmpeg.org/doxygen/3.4/filtering_video_8c-example.html ,
but this example doesn't shows how to print black frame detected
duration, instead it prints out video frames.
The blackdetect filter sets "lavfi.black_start" in your AVFrame.metadata
to a time string using AVFrame.pts and the time base (when it detects
the start of a black sequence). When the black frames end, it sets
"lavfi.black_end" in AVFrame.metadata, again using pts and time base.
You'll have to check each frame's metadata (AVDictionary*) and compute
the duration yourself.
As of now, I have replaced
constchar*filter_descr
<https://ffmpeg.org/doxygen/3.4/filtering__video_8c.html#a84b31b94c024a45c4bcebd875a54e73d>=
"scale=78:24,transpose=cclock"; to constchar*filter_descr
<https://ffmpeg.org/doxygen/3.4/filtering__video_8c.html#a84b31b94c024a45c4bcebd875a54e73d>=
"blackdetect=d=2:pix_th=0.00";
in the code.
Thanks & regards,
S.Venkateswaran
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--
Philippe Gorley
Free Software Consultant | Montréal, Qc
Savoir-faire Linux
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