levanthai Posted September 21, 2018 Share Posted September 21, 2018 Hi all, I've been reading a lot about VPU acceleration for h264 decoding and encoding. However, it seems that there is not much regarding transcoding (decoding + encoding). I would be interested in decoding 1080p h264 and encoding it back to 720p h264 in realtime. Ideally having that operation on 2 streams in parallel would be great. I've seen that quite some work has been done in cedrus As I can, h264 decoding seems to be supported but encoding is unclear. And there is obviously no comment about running both operations at the same time. Since I would like to run a few tests and maybe help a bit, what hardware should I order ? Allwinner H3/H5/else ? Thanks Link to comment Share on other sites More sharing options...
Igor Posted September 21, 2018 Share Posted September 21, 2018 1 hour ago, levanthai said: I would be interested in decoding 1080p h264 and encoding it back to 720p h264 in realtime. It might work on H3 with the legacy kernel but never tried such a scenario. Mainline kernel support is WIP at the moment. Link to comment Share on other sites More sharing options...
sfx2000 Posted September 26, 2018 Share Posted September 26, 2018 On 9/20/2018 at 7:24 PM, levanthai said: I've seen that quite some work has been done in cedrus Are you referring to the bootlin effort on the Allwinner cedrus stuff? Great work there from a high-quality team... not sure if all they've done has made it into mainline yet... but it's promising. A word on transcoding in general - one is always going to get a quality hit when moving from one format to another - I'd always consider doing it at the last stage for playback only, not for archival purposes... Link to comment Share on other sites More sharing options...
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