Jonathan Baecker <jonba...@gmail.com> 于2024年9月29日周日 05:56写道：
>
> If 'sname:*' is set in the var_stream_map variable, use it as
> the NAME attribute for subtitles. This improves the naming of
> subtitle streams in HTML players, providing clearer and more
> descriptive labels for users.
> ---
> doc/muxers.texi | 5 +++--
> libavformat/hlsenc.c | 7 ++++++-
> libavformat/hlsplaylist.c | 9 +++++++--
> libavformat/hlsplaylist.h | 2 +-
> 4 files changed, 17 insertions(+), 6 deletions(-)
>
> diff --git a/doc/muxers.texi b/doc/muxers.texi
> index ce93ba1488..04b7f20b7e 100644
> --- a/doc/muxers.texi
> +++ b/doc/muxers.texi
> @@ -2436,13 +2436,14 @@ ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0
> 1000k \
> @item
> Create a single variant stream. Add the @code{#EXT-X-MEDIA} tag with
> @code{TYPE=SUBTITLES} in the master playlist with webvtt subtitle group name
> -'subtitle'. Make sure the input file has one text subtitle stream at least.
> +'subtitle' and optional subtitle name, e.g. 'English'. Make sure the input
> +file has one text subtitle stream at least.
> @example
> ffmpeg -y -i input_with_subtitle.mkv \
> -b:v:0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \
> -b:a:0 256k \
> -c:s webvtt -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0 -map 0:s:0 \
> - -f hls -var_stream_map "v:0,a:0,s:0,sgroup:subtitle" \
> + -f hls -var_stream_map "v:0,a:0,s:0,sgroup:subtitle,sname:English" \
> -master_pl_name master.m3u8 -t 300 -hls_time 10 -hls_init_time 4
> -hls_list_size \
> 10 -master_pl_publish_rate 10 -hls_flags \
> delete_segments+discont_start+split_by_time ./tmp/video.m3u8
> diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
> index 1e932b7b0e..7b2145f5bf 100644
> --- a/libavformat/hlsenc.c
> +++ b/libavformat/hlsenc.c
> @@ -189,6 +189,7 @@ typedef struct VariantStream {
> const char *sgroup; /* subtitle group name */
> const char *ccgroup; /* closed caption group name */
> const char *varname; /* variant name */
> + const char *subtitle_varname; /* subtitle variant name */
> } VariantStream;
>
> typedef struct ClosedCaptionsStream {
> @@ -1533,7 +1534,8 @@ static int create_master_playlist(AVFormatContext *s,
> break;
> }
>
> - ff_hls_write_subtitle_rendition(hls->m3u8_out, sgroup,
> vtt_m3u8_rel_name, vs->language, i, hls->has_default_key ? vs->is_default :
> 1);
> + ff_hls_write_subtitle_rendition(hls->m3u8_out, sgroup,
> vtt_m3u8_rel_name, vs->language,
> + vs->subtitle_varname, i, hls->has_default_key ?
> vs->is_default : 1);
> }
>
> if (!hls->has_default_key || !hls->has_video_m3u8) {
> @@ -2107,6 +2109,9 @@ static int
> parse_variant_stream_mapstring(AVFormatContext *s)
> } else if (av_strstart(keyval, "name:", &val)) {
> vs->varname = val;
> continue;
> + } else if (av_strstart(keyval, "sname:", &val)) {
> + vs->subtitle_varname = val;
> + continue;
> } else if (av_strstart(keyval, "agroup:", &val)) {
> vs->agroup = val;
> continue;
> diff --git a/libavformat/hlsplaylist.c b/libavformat/hlsplaylist.c
> index f8a6977702..17b93a5ef1 100644
> --- a/libavformat/hlsplaylist.c
> +++ b/libavformat/hlsplaylist.c
> @@ -57,13 +57,18 @@ void ff_hls_write_audio_rendition(AVIOContext *out, const
> char *agroup,
>
> void ff_hls_write_subtitle_rendition(AVIOContext *out, const char *sgroup,
> const char *filename, const char
> *language,
> - int name_id, int is_default)
> + const char *sname, int name_id, int
> is_default)
> {
> if (!out || !filename)
> return;
>
> avio_printf(out, "#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID=\"%s\"", sgroup);
> - avio_printf(out, ",NAME=\"subtitle_%d\",DEFAULT=%s,", name_id,
> is_default ? "YES" : "NO");
> + if (sname) {
> + avio_printf(out, ",NAME=\"%s\",", sname);
> + } else {
> + avio_printf(out, ",NAME=\"subtitle_%d\",", name_id);
> + }
> + avio_printf(out, "DEFAULT=%s,", is_default ? "YES" : "NO");
> if (language) {
> avio_printf(out, "LANGUAGE=\"%s\",", language);
> }
> diff --git a/libavformat/hlsplaylist.h b/libavformat/hlsplaylist.h
> index d7aa44d8dc..ec44e5a0ae 100644
> --- a/libavformat/hlsplaylist.h
> +++ b/libavformat/hlsplaylist.h
> @@ -41,7 +41,7 @@ void ff_hls_write_audio_rendition(AVIOContext *out, const
> char *agroup,
> int name_id, int is_default, int
> nb_channels);
> void ff_hls_write_subtitle_rendition(AVIOContext *out, const char *sgroup,
> const char *filename, const char
> *language,
> - int name_id, int is_default);
> + const char *sname, int name_id, int
> is_default);
> void ff_hls_write_stream_info(AVStream *st, AVIOContext *out, int bandwidth,
> int avg_bandwidth,
> const char *filename, const char *agroup,
> --
> 2.46.1
>
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The modified api looks only be used by hlsenc, and it looks fine to me.
Will apply after 48 hours if there have no more comments.
Thanks
Steven
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