| Message ID | 20231209193112.783495-1-marth64@proxyid.net |
|---|---|
| State | New |
| Headers | show |
| Series | [FFmpeg-devel] doc/bitstream_filters: add filter_units practical examples for removing closed captions | expand |
| Context | Check | Description |
|---|---|---|
| yinshiyou/make_loongarch64 | success | Make finished |
| yinshiyou/make_fate_loongarch64 | success | Make fate finished |
| andriy/make_x86 | success | Make finished |
| andriy/make_fate_x86 | success | Make fate finished |
On date Saturday 2023-12-09 13:31:13 -0600, Marth64 wrote: > --- > doc/bitstream_filters.texi | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi > index 145aa8684e..b01ede0c93 100644 > --- a/doc/bitstream_filters.texi > +++ b/doc/bitstream_filters.texi > @@ -213,6 +213,23 @@ To remove all AUDs, SEI and filler from an H.265 stream: > ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=35|38-40' OUTPUT > @end example > > +By nature of removing SEI messages, the filter can also remove Closed Captions. I think you might expand this to shortly explain the relation between Closed Captions and SEI message. Also, I'd avoid the expression "by nature" and replace with a plainer/more explicit expression (as most of the readers are not English speakers). [...]
Appreciate the good feedback, will update. Thank you. On Sat, Dec 9, 2023 at 6:53 PM Stefano Sabatini <stefasab@gmail.com> wrote: > On date Saturday 2023-12-09 13:31:13 -0600, Marth64 wrote: > > --- > > doc/bitstream_filters.texi | 17 +++++++++++++++++ > > 1 file changed, 17 insertions(+) > > > > diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi > > index 145aa8684e..b01ede0c93 100644 > > --- a/doc/bitstream_filters.texi > > +++ b/doc/bitstream_filters.texi > > @@ -213,6 +213,23 @@ To remove all AUDs, SEI and filler from an H.265 > stream: > > ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=35|38-40' > OUTPUT > > @end example > > > > > +By nature of removing SEI messages, the filter can also remove Closed > Captions. > > I think you might expand this to shortly explain the relation between > Closed Captions and SEI message. Also, I'd avoid the expression "by > nature" and replace with a plainer/more explicit expression (as most > of the readers are not English speakers). > > [...] >
diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi index 145aa8684e..b01ede0c93 100644 --- a/doc/bitstream_filters.texi +++ b/doc/bitstream_filters.texi @@ -213,6 +213,23 @@ To remove all AUDs, SEI and filler from an H.265 stream: ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=35|38-40' OUTPUT @end example +By nature of removing SEI messages, the filter can also remove Closed Captions. + +To remove SEI messages (including CC) from a MPEG-2 stream: +@example +ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=178' OUTPUT +@end example + +To remove SEI messages (including CC) from a H264 stream: +@example +ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=6' OUTPUT +@end example + +To remove SEI messages (including CC and dynamic HDR) from a HEVC stream: +@example +ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=39' OUTPUT +@end example + @section hapqa_extract Extract Rgb or Alpha part of an HAPQA file, without recompression, in order to create an HAPQ or an HAPAlphaOnly file.