I tried looking into the FFmpeg documentation, but couldn't find any bitstream filter that could take two inputs.
Is this not possible by design, or has such a use-case just not come up until now?
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Can you give an example of a BSF that would require multiple inputs? – Gyan Jan 18 '18 at 06:17
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A filter that can for example compare some metadata present in two bit streams, or that can decode 2 bit streams and compute PSNR. – nsp Jan 18 '18 at 08:42
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PSNR requires a comparison of the decoded streams, and it already [exists](https://ffmpeg.org/ffmpeg-filters.html#psnr). – Gyan Jan 18 '18 at 09:27
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Yes. I used PSNR just as an example. I basically want to compute some quality metrics on the decoded output (by comparing with source stream). I want to do this computation as a part of decoding process as it will be computationally efficient. – nsp Jan 18 '18 at 11:46
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@Gyan 608 embedding without transcode – Aleksandr Dubinsky Aug 10 '23 at 14:01