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SRT Subtitle has 1 frame offset with XDCAM422i50
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Rens Dijkshoorn  
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 More options Aug 31 2012, 12:23 pm
From: Rens Dijkshoorn <rens.dijksho...@gmail.com>
Date: Fri, 31 Aug 2012 09:23:15 -0700 (PDT)
Local: Fri, Aug 31 2012 12:23 pm
Subject: SRT Subtitle has 1 frame offset with XDCAM422i50
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Hi,

when using the command below the first subtitle is dropped, we start
on the
first frame with 00:00:00:01 with xcdam422i50.MXF as input format.

While tests with IMX50i50.MXF and DVCPRO...@1080i50.MXF are spot on

Command:

ffmbc -i xdcam...@i50.MXF \
-vf sub=file=sub.srt:vmargin=1000:box=1:boxcolor=0x00000080 \
-aspect 16:9 -vcodec libx264 -faststart 1 -profile baseline -b 1500k -
g 25 \
-map_audio_channel 0:1:0:0:1 -map_audio_channel 0:2:0:0:1 \
-ac 2 -acodec libfaac -ab 128k file_sub.mp4

The SRT file is used to provide TC display

SRT file sub.srt

0
00:00:00,000 --> 00:00:00,001
00:00:00:00

1
00:00:00,040 --> 00:00:00,041
00:00:00:01

2
00:00:00,080 --> 00:00:00,081
00:00:00:02

etc...

any idea

Regards

Rens Dijkshoorn


 
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