[Libav-user] libavfilter help - for filtering I frames from Transport stream

[Dhanish Vijayan]

Hi All,

I have successfully used ffmpeg command line tool to extract all
Iframes(Key frames) from a transport stream and saved to file using the
following command

ffmpeg -i ESPN-DISH.ts -f image2 -vf "select=eq(pict_type\,PICT_TYPE_I)"
 -vsync vfr yi%03d.png

For my particular use case, I have to read the frames programatically to
extract the I frames and stream the I frames in a UI container. So far I
can compile and the following program from this link to extract the YUV
filtered images.

I found this example easy to modify for my use case.
https://github.com/leixiaohua1020/simplest_ffmpeg_video_filter/blob/master/simplest_ffmpeg_video_filter/simplest_ffmpeg_video_filter.cpp

But I am having confusion on how to use the
select=eq(pict_type\,PICT_TYPE_I) filter in the code. Particularly I can
see the following functions to define the filter.

AVFilter *buffersrc  = avfilter_get_by_name("buffer");
AVFilter *buffersink = avfilter_get_by_name("ffbuffersink");

But couldnt figure out how to tweak the code for extraction of I frames.

Please anyone help me to use the functions suitably for filtering the I
frames from the video input.

Thanks in advance.

-- 

Thank you,
warm regards,

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Dhanish Vijayan

Chief Technical Officer

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