Re: [FFmpeg-devel] [PATCH v5 4/5] lavfi/format: wrap auto filters into structures

["Wu, Tong1" <tong1.wu-at-intel.com@ffmpeg.org>]

Kindly ping


>>Possibility for infinite loops?
>
>>In what cases this helps, have graphs examples to test?
>
>Now we only have scale filter that can be auto inserted. This patch set
>basically gives the potential capability to add more auto filters. An auto
>hwmap filter is introduced for now. It can be beneficial to hwmap use cases.
>
>For example,
>ffmpeg -init_hw_device d3d11va=d3d11 -init_hw_device qsv=qsv@d3d11 -
>hwaccel d3d11va -hwaccel_output_format d3d11 -i input.mp4 -vf
>“hwmap=derive_device=qsv:extra_hw_frames=16,format=qsv” -c:v h264_qsv
>output.mp4
>
>Now we don’t have to explicitly specify hwmap. The auto filter mechanism will
>try to insert a hwmap filter automatically. The command line will be much
>simpler.
>
>ffmpeg -init_hw_device d3d11va=d3d11 -init_hw_device qsv=qsv@d3d11 -
>hwaccel d3d11va -hwaccel_output_format d3d11 -i input.mp4 -c:v h264_qsv
>output.mp4
>
>Could you explain a little bit why the loop could be infinite?
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