the runtime (playtime) is different (slightly longer, at a rate of about 4 seconds per hour of playtime) vs.the output is now DF (not NDF as the source), per mediainfo analysis.The transcoded video's duration is now 6s 48ms ( 00:00:06 00 DF TC) per mediainfo. It has no framerate or any other changes. We fed it to a basic Telestream Vantage Flip (v.8.0) transcode that does nothing except transcodes to the same output codec (ProRes HQ). mediainfo shows its duration as 6s 6ms ( 00:00:06:00 NDF TC) We used a 6-second 144-frame 23.98p NDF (non-drop-frame) ProRes HQ video consisting of black frames. We've confirmed the issue in our testing as follows: (The funny part is that the issue has nothing to do with compressed or uncompressed - the unexpected duration change occurs on any 23.98p NDF sources regardless of codecs or compression.) "the transcode is functioning properly by design" and "You will see these artifacts, or minor differences in duration, when going from an uncompressed source file to a compressed format." We've escalated the issue to Telestream (case 00824478) and their response was: Have not yet tried other encoders or transcodes (e.g. Build 52) export does not have the issue. Has anyone run into this and if so, what was the workaround? The captions are in sync with the source file - but slowly drift out of sync with the video transcoded by Telestream Flip - because the duration is different. The duration however does change - increases by about 4 seconds for every hour of the video - and this in turn results in a captions drift when the captions are supplied as sidecar files as opposed to embedded ones. In other words we expect the video duration not to change after transcoding. from MPEG to QT or from ProRes HQ to standard ProRes) with no frame rate or other changes. The transcoding is a mere codec or compression change (e.g. We've run into an issue where Telestream Flip (or Flip64 or IPTV Flip) unexpectedly changes the timebase of the video from 23.98p NDF to 23.98p DF during transcoding - which effectively changes its duration by a small amount.
0 kommentar(er)
