bad artifacting during vertical pan with vbv
- source file: https://storage.googleapis.com/vimeo-chud-ii/issue_transcoding_67/1271294851.mov
- problem: bad artifacting at 1:12 and 2:14
- screenshot:
-
encoding options:
crf=20:vbv-bufsize=15000:vbv-maxrate=5500
-
tests:
threads=1
,preset=slower
, no vbv, encoding a chunk
When encoding a chunk of the video around the affected areas the problem is not reproducible, this happens only when encoding from the start of the video. The number of threads and preset level have no impact on this, but disabling vbv does fix the problem.