> 2020年3月26日 下午9:56，lance.lmw...@gmail.com 写道：
>
> From: Limin Wang <lance.lmw...@gmail.com>
>
> Test with the following command for the webvtt subtitle:
> $ ./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” \
What about add the example into doc/muxer.texi ?
> -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
>
> Check the master m3u8:
> $ cat tmp/master.m3u8
> #EXTM3U
> #EXT-X-VERSION:3
> #EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subtitle",NAME="subtitle_0",DEFAULT=YES,URI="video_vtt.m3u8"
> #EXT-X-STREAM-INF:BANDWIDTH=6056600,RESOLUTION=1280x720,CODECS="avc1.4d4829,mp4a.40.33",SUBTITLES="subtitle"
> video.m3u8
>
> Check the result by convert to mkv:
> $ ./ffmpeg -strict experimental -i ./tmp/master.m3u8 -c:v copy -c:a mp2 -c:s
> srt ./test.mkv
>
> Signed-off-by: Limin Wang <lance.lmw...@gmail.com>
> ---
> libavformat/dashenc.c | 2 +-
> libavformat/hlsenc.c | 26 ++++++++++++++++++++++++--
> libavformat/hlsplaylist.c | 17 ++++++++++++++++-
> libavformat/hlsplaylist.h | 4 +++-
> 4 files changed, 44 insertions(+), 5 deletions(-)
>
> diff --git a/libavformat/dashenc.c b/libavformat/dashenc.c
> index 94d463972a..d1fe90b00c 100644
> --- a/libavformat/dashenc.c
> +++ b/libavformat/dashenc.c
> @@ -1311,7 +1311,7 @@ static int write_manifest(AVFormatContext *s, int final)
> get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL,
> i);
> ff_hls_write_stream_info(st, c->m3u8_out, stream_bitrate,
> playlist_file, agroup,
> - codec_str_ptr, NULL);
> + codec_str_ptr, NULL, NULL);
> }
> dashenc_io_close(s, &c->m3u8_out, temp_filename);
> if (use_rename)
> diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
> index a0a3a4647b..d7b9c0e20a 100644
> --- a/libavformat/hlsenc.c
> +++ b/libavformat/hlsenc.c
> @@ -164,6 +164,7 @@ typedef struct VariantStream {
> int is_default; /* default status of audio group */
> char *language; /* audio lauguage name */
> char *agroup; /* audio group name */
> + char *sgroup; /* subtitle group name */
> char *ccgroup; /* closed caption group name */
> char *baseurl;
> char *varname; // variant name
> @@ -1289,7 +1290,9 @@ static int create_master_playlist(AVFormatContext *s,
> unsigned int i, j;
> int ret, bandwidth;
> const char *m3u8_rel_name = NULL;
> + const char *vtt_m3u8_rel_name = NULL;
> char *ccgroup;
> + char *sgroup = NULL;
> ClosedCaptionsStream *ccs;
> const char *proto = avio_find_protocol_name(hls->master_m3u8_url);
> int is_file_proto = proto && !strcmp(proto, "file");
> @@ -1412,13 +1415,24 @@ static int create_master_playlist(AVFormatContext *s,
> vs->ccgroup);
> }
>
> + if (vid_st && vs->sgroup) {
> + sgroup = vs->sgroup;
> + vtt_m3u8_rel_name = get_relative_url(hls->master_m3u8_url,
> vs->vtt_m3u8_name);
> + if (!vtt_m3u8_rel_name) {
> + av_log(s, AV_LOG_WARNING, "Unable to find relative subtitle
> URL\n");
> + 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);
> + }
> +
> if (!hls->has_default_key || !hls->has_video_m3u8) {
> ff_hls_write_stream_info(vid_st, hls->m3u8_out, bandwidth,
> m3u8_rel_name,
> - aud_st ? vs->agroup : NULL, vs->codec_attr, ccgroup);
> + aud_st ? vs->agroup : NULL, vs->codec_attr, ccgroup,
> sgroup);
> } else {
> if (vid_st) {
> ff_hls_write_stream_info(vid_st, hls->m3u8_out, bandwidth,
> m3u8_rel_name,
> - aud_st ? vs->agroup : NULL,
> vs->codec_attr, ccgroup);
> + aud_st ? vs->agroup : NULL,
> vs->codec_attr, ccgroup, sgroup);
> }
> }
> }
> @@ -1893,6 +1907,7 @@ static int
> parse_variant_stream_mapstring(AVFormatContext *s)
> * practical usage)
> *
> * agroup: is key to specify audio group. A string can be given as value.
> + * sgroup: is key to specify subtitle group. A string can be given as
> value.
> */
> p = av_strdup(hls->var_stream_map);
> if (!p)
> @@ -1960,6 +1975,12 @@ static int
> parse_variant_stream_mapstring(AVFormatContext *s)
> if (!vs->agroup)
> return AVERROR(ENOMEM);
> continue;
> + } else if (av_strstart(keyval, "sgroup:", &val)) {
> + av_free(vs->sgroup);
> + vs->sgroup = av_strdup(val);
> + if (!vs->sgroup)
> + return AVERROR(ENOMEM);
> + continue;
> } else if (av_strstart(keyval, "ccgroup:", &val)) {
> av_free(vs->ccgroup);
> vs->ccgroup = av_strdup(val);
> @@ -2516,6 +2537,7 @@ static void hls_free_variant_streams(struct HLSContext
> *hls)
> av_freep(&vs->m3u8_name);
> av_freep(&vs->streams);
> av_freep(&vs->agroup);
> + av_freep(&vs->sgroup);
> av_freep(&vs->language);
> av_freep(&vs->ccgroup);
> av_freep(&vs->baseurl);
> diff --git a/libavformat/hlsplaylist.c b/libavformat/hlsplaylist.c
> index 56244496c0..43f9d281ba 100644
> --- a/libavformat/hlsplaylist.c
> +++ b/libavformat/hlsplaylist.c
> @@ -48,9 +48,22 @@ void ff_hls_write_audio_rendition(AVIOContext *out, char
> *agroup,
> avio_printf(out, "URI=\"%s\"\n", filename);
> }
>
> +void ff_hls_write_subtitle_rendition(AVIOContext *out, char *sgroup,
> + const char *filename, char *language, 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 (language) {
> + avio_printf(out, "LANGUAGE=\"%s\",", language);
> + }
> + avio_printf(out, "URI=\"%s\"\n", filename);
> +}
> +
> void ff_hls_write_stream_info(AVStream *st, AVIOContext *out,
> int bandwidth, const char *filename, char
> *agroup,
> - char *codecs, char *ccgroup) {
> + char *codecs, char *ccgroup, char *sgroup) {
>
> if (!out || !filename)
> return;
> @@ -71,6 +84,8 @@ void ff_hls_write_stream_info(AVStream *st, AVIOContext
> *out,
> avio_printf(out, ",AUDIO=\"group_%s\"", agroup);
> if (ccgroup && ccgroup[0])
> avio_printf(out, ",CLOSED-CAPTIONS=\"%s\"", ccgroup);
> + if (sgroup && sgroup[0])
> + avio_printf(out, ",SUBTITLES=\"%s\"", sgroup);
> avio_printf(out, "\n%s\n\n", filename);
> }
>
> diff --git a/libavformat/hlsplaylist.h b/libavformat/hlsplaylist.h
> index a8d29d62d3..a124bdcffb 100644
> --- a/libavformat/hlsplaylist.h
> +++ b/libavformat/hlsplaylist.h
> @@ -39,9 +39,11 @@ typedef enum {
> void ff_hls_write_playlist_version(AVIOContext *out, int version);
> void ff_hls_write_audio_rendition(AVIOContext *out, char *agroup,
> const char *filename, char *language, int
> name_id, int is_default);
> +void ff_hls_write_subtitle_rendition(AVIOContext *out, char *sgroup,
> + const char *filename, char *language, int
> name_id, int is_default);
> void ff_hls_write_stream_info(AVStream *st, AVIOContext *out,
> int bandwidth, const char *filename, char
> *agroup,
> - char *codecs, char *ccgroup);
> + char *codecs, char *ccgroup, char *sgroup);
> void ff_hls_write_playlist_header(AVIOContext *out, int version, int
> allowcache,
> int target_duration, int64_t sequence,
> uint32_t playlist_type, int iframe_mode);
> --
> 2.21.0
>
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Thanks
Steven Liu
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