Samsung UN65H8000AFXZA - Manual (Page 219)

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Supported External Subtitles
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Certain files, depending on how they were encoded, may not play on the TV.
Name Format
MPEG-4 Timed text .ttxt
SAMI .smi
SubRip .srt
SubViewer .sub
Micro DVD .sub or .txt
SubStation Alpha .ssa
Advanced SubStation Alpha .ass
Powerdivx .psb
SMPTE-TT Text .xml
Supported Internal Subtitles
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Certain files, depending on how they were encoded, may not play on the TV.
Name Format
Xsub AVI
SubStation Alpha MKV
Advanced SubStation Alpha MKV
SubRip MKV
VobSub MKV
MPEG-4 Timed text MP4
TTML in smooth streaming MP4
SMPTE-TT Text MP4
SMPTE-TT PNG MP4