[FFmpeg-trac] #1778(undetermined:reopened): EIA-608 / EIA-708 Closed Captions disappear when transcoding/reencoding

[FFmpeg]

#1778: EIA-608 / EIA-708 Closed Captions disappear when transcoding/reencoding
-------------------------------------+-------------------------------------
             Reporter:  mikecheat04  |                    Owner:
                 Type:  enhancement  |  er.anshul.maheshwari@…
             Priority:  wish         |                   Status:  reopened
              Version:  git-master   |                Component:
             Keywords:  cc           |  undetermined
             Blocking:               |               Resolution:
Analyzed by developer:  0            |               Blocked By:
                                     |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by hemube):

 If the source has only single CC in 608/708 format then latest FFmpeg have
 the option to retain the 608/70d data after transcoding.


 == working file Media Info ==



 {{{
 Text #1
 ID                                       : 256 (0x100)-CC1
 Menu ID                                  : 1 (0x1)
 Format                                   : EIA-608
 Muxing mode                              : SCTE 128 / DTVCC Transport
 Muxing mode, more info                   : Muxed in Video #1
 Duration                                 : 20s 938ms
 Bit rate mode                            : Constant
 Stream size                              : 0.00 Byte (0%)

 Text #2
 ID                                       : 256 (0x100)-1
 Menu ID                                  : 1 (0x1)
 Format                                   : EIA-708
 Muxing mode                              : SCTE 128 / DTVCC Transport
 Muxing mode, more info                   : Muxed in Video #1
 Duration                                 : 20s 938ms
 Bit rate mode                            : Constant
 Stream size                              : 0.00 Byte (0%)
 }}}

 At the same time if the source has multiple CC streams then FFmpeg is not
 retaining the CC.


 == Not working file Media Info ==


 {{{
 Text #1
 ID                                       : 256 (0x100)-CC1
 Menu ID                                  : 1 (0x1)
 Format                                   : EIA-608
 Muxing mode                              : SCTE 128 / DTVCC Transport
 Muxing mode, more info                   : Muxed in Video #1
 Duration                                 : 26s 593ms
 Bit rate mode                            : Constant
 Stream size                              : 0.00 Byte (0%)

 Text #2
 ID                                       : 256 (0x100)-CC3
 Menu ID                                  : 1 (0x1)
 Format                                   : EIA-608
 Muxing mode                              : SCTE 128 / DTVCC Transport
 Muxing mode, more info                   : Muxed in Video #1
 Duration                                 : 26s 593ms
 Bit rate mode                            : Constant
 Stream size                              : 0.00 Byte (0%)

 Text #3
 ID                                       : 256 (0x100)-1
 Menu ID                                  : 1 (0x1)
 Format                                   : EIA-708
 Muxing mode                              : SCTE 128 / DTVCC Transport
 Muxing mode, more info                   : Muxed in Video #1
 Duration                                 : 26s 593ms
 Bit rate mode                            : Constant
 Stream size                              : 0.00 Byte (0%)

 Text #4
 ID                                       : 256 (0x100)-2
 Menu ID                                  : 1 (0x1)
 Format                                   : EIA-708
 Muxing mode                              : SCTE 128 / DTVCC Transport
 Muxing mode, more info                   : Muxed in Video #1
 Duration                                 : 26s 593ms
 Bit rate mode                            : Constant
 Stream size                              : 0.00 Byte (0%)
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/1778#comment:12>
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