I have also a lot reports that HW transcoding is broken for 4.3 at LE with recent (1-2months) changes (x86_64).
Not sure that this is the actually problem but maybe (no time yet to search the problem)
> [ ERROR] transcode: 0003: Unable to find libx264 encoder
> [ INFO] transcode: 0003: 1:H264 ==> Passthrough
> [ INFO] transcode: 0003: 2:MPEG2AUDIO ==> AAC (aac)
> [WARNING] libav: Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
> [WARNING] libav: Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.