Hi Vassily, I would also add that you need to set a reasonable amount of frames for the VBV adjustment, otherwise your last frames may suffer quality-wise. Best, Alex.
On Wed, Mar 7, 2018 at 9:28 AM, Aruna Matheswaran < ar...@multicorewareinc.com> wrote: > Hi, > > vbv-init specifies the portion of the vbv buffer which must be available > before the encoder begins encoding and * vbv-end* denotes the portion of > the vbv buffer that must be available after all the specified frames have > been inserted into the vbv buffer. > Therefore, while encoding multiple chunks in parallel and merging them > into a single stream, *vbv-init of any chunk should be the same as the > vbv-end of its previous chunk*. If vbv-end of chunk X is less than > vbv-init of chunk X+1, there are chances for the buffer to overflow. > > Thanks, > Aruna > > On Wed, Mar 7, 2018 at 4:43 PM, Vasiliy Volkov <volk.vasi...@gmail.com> > wrote: > >> Hi, >> >> Recently libx265 gets vbv-end encoding option with comment that it can be >> used for chunked encoding. My question is how it can be used? >> >> Recently we've split our encoding session into multiple processes -- so >> multiple instances of libx265 encoder encodes same stream, GOP by GOP, and >> then such stream merges into single stream again. It works well, but rate >> controllers are not share their states between encoders instances and I >> think such encoding is not VBV-compliant. >> And from comment to vbv-end option I think that it can fix it encoding. >> >> Can somebody explain how this option should be used and how it can helps >> us (or maybe not and we need to find another solution)? >> >> For example, we use such encoding options: >> bitrate=4500:bufsize=10000:maxrate=5000, >> and in such setup vbv-init by default is 0.9 >> >> For this setup what we need to specify for vbv-end? >> >> >> >> _______________________________________________ >> x265-devel mailing list >> x265-devel@videolan.org >> https://mailman.videolan.org/listinfo/x265-devel >> >> > > _______________________________________________ > x265-devel mailing list > x265-devel@videolan.org > https://mailman.videolan.org/listinfo/x265-devel > >
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