From: Jan Ekström <jan.ekst...@24i.com> Enables encoding of other subtitle formats into TTML and writing them out as such documents.
Signed-off-by: Jan Ekström <jan.ekst...@24i.com> --- Changelog | 1 + doc/general_contents.texi | 1 + libavcodec/Makefile | 1 + libavcodec/allcodecs.c | 1 + libavcodec/ttmlenc.c | 210 +++++++++++++++++++++++++++++++++++++ libavcodec/ttmlenc.h | 28 +++++ libavcodec/version.h | 4 +- libavformat/Makefile | 1 + libavformat/allformats.c | 1 + libavformat/ttmlenc.c | 174 ++++++++++++++++++++++++++++++ tests/fate/subtitles.mak | 3 + tests/ref/fate/sub-ttmlenc | 122 +++++++++++++++++++++ 12 files changed, 545 insertions(+), 2 deletions(-) create mode 100644 libavcodec/ttmlenc.c create mode 100644 libavcodec/ttmlenc.h create mode 100644 libavformat/ttmlenc.c create mode 100644 tests/ref/fate/sub-ttmlenc diff --git a/Changelog b/Changelog index ba5aebf79d..4c8d8a8b29 100644 --- a/Changelog +++ b/Changelog @@ -77,6 +77,7 @@ version <next>: - OpenEXR image encoder - Simbiosis IMX decoder - Simbiosis IMX demuxer +- TTML subtitle encoder and muxer version 4.3: diff --git a/doc/general_contents.texi b/doc/general_contents.texi index 6acdf441d6..58c9bcf747 100644 --- a/doc/general_contents.texi +++ b/doc/general_contents.texi @@ -1352,6 +1352,7 @@ performance on systems without hardware floating point support). @item SubViewer v1 @tab @tab X @tab @tab X @item SubViewer @tab @tab X @tab @tab X @item TED Talks captions @tab @tab X @tab @tab X +@item TTML @tab X @tab @tab X @tab @item VobSub (IDX+SUB) @tab @tab X @tab @tab X @item VPlayer @tab @tab X @tab @tab X @item WebVTT @tab X @tab X @tab X @tab X diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 6ec1d360ac..4b1be2e37c 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -672,6 +672,7 @@ OBJS-$(CONFIG_TSCC_DECODER) += tscc.o msrledec.o OBJS-$(CONFIG_TSCC2_DECODER) += tscc2.o OBJS-$(CONFIG_TTA_DECODER) += tta.o ttadata.o ttadsp.o OBJS-$(CONFIG_TTA_ENCODER) += ttaenc.o ttaencdsp.o ttadata.o +OBJS-$(CONFIG_TTML_ENCODER) += ttmlenc.o ass_split.o OBJS-$(CONFIG_TWINVQ_DECODER) += twinvqdec.o twinvq.o metasound_data.o OBJS-$(CONFIG_TXD_DECODER) += txd.o OBJS-$(CONFIG_ULTI_DECODER) += ulti.o diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index 354d146379..a91f19ae31 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -689,6 +689,7 @@ extern AVCodec ff_subviewer_decoder; extern AVCodec ff_subviewer1_decoder; extern AVCodec ff_text_encoder; extern AVCodec ff_text_decoder; +extern AVCodec ff_ttml_encoder; extern AVCodec ff_vplayer_decoder; extern AVCodec ff_webvtt_encoder; extern AVCodec ff_webvtt_decoder; diff --git a/libavcodec/ttmlenc.c b/libavcodec/ttmlenc.c new file mode 100644 index 0000000000..3972b4368c --- /dev/null +++ b/libavcodec/ttmlenc.c @@ -0,0 +1,210 @@ +/* + * TTML subtitle encoder + * Copyright (c) 2020 24i + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * TTML subtitle encoder + * @see https://www.w3.org/TR/ttml1/ + * @see https://www.w3.org/TR/ttml2/ + * @see https://www.w3.org/TR/ttml-imsc/rec + */ + +#include "avcodec.h" +#include "internal.h" +#include "libavutil/avstring.h" +#include "libavutil/bprint.h" +#include "libavutil/internal.h" +#include "ass_split.h" +#include "ass.h" +#include "ttmlenc.h" + +typedef struct { + AVCodecContext *avctx; + ASSSplitContext *ass_ctx; + AVBPrint buffer; +} TTMLContext; + +static void ttml_text_cb(void *priv, const char *text, int len) +{ + TTMLContext *s = priv; + AVBPrint cur_line = { 0 }; + AVBPrint *buffer = &s->buffer; + + av_bprint_init(&cur_line, len, AV_BPRINT_SIZE_UNLIMITED); + + av_bprint_append_data(&cur_line, text, len); + if (!av_bprint_is_complete(&cur_line)) { + av_log(s->avctx, AV_LOG_ERROR, + "Failed to move the current subtitle dialog to AVBPrint!\n"); + av_bprint_finalize(&cur_line, NULL); + return; + } + + + av_bprint_escape(buffer, cur_line.str, NULL, AV_ESCAPE_MODE_XML, + 0); + + av_bprint_finalize(&cur_line, NULL); +} + +static void ttml_new_line_cb(void *priv, int forced) +{ + TTMLContext *s = priv; + + av_bprintf(&s->buffer, "<br/>"); +} + +static const ASSCodesCallbacks ttml_callbacks = { + .text = ttml_text_cb, + .new_line = ttml_new_line_cb, +}; + +static int ttml_encode_frame(AVCodecContext *avctx, uint8_t *buf, + int bufsize, const AVSubtitle *sub) +{ + TTMLContext *s = avctx->priv_data; + ASSDialog *dialog; + int i; + + av_bprint_clear(&s->buffer); + + for (i=0; i<sub->num_rects; i++) { + const char *ass = sub->rects[i]->ass; + + if (sub->rects[i]->type != SUBTITLE_ASS) { + av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n"); + return AVERROR(EINVAL); + } + +#if FF_API_ASS_TIMING + if (!strncmp(ass, "Dialogue: ", 10)) { + int num; + dialog = ff_ass_split_dialog(s->ass_ctx, ass, 0, &num); + + for (; dialog && num--; dialog++) { + int ret = ff_ass_split_override_codes(&ttml_callbacks, s, + dialog->text); + int log_level = (ret != AVERROR_INVALIDDATA || + avctx->err_recognition & AV_EF_EXPLODE) ? + AV_LOG_ERROR : AV_LOG_WARNING; + + if (ret < 0) { + av_log(avctx, log_level, + "Splitting received ASS dialog failed: %s\n", + av_err2str(ret)); + + if (log_level == AV_LOG_ERROR) + return ret; + } + } + } else { +#endif + dialog = ff_ass_split_dialog2(s->ass_ctx, ass); + if (!dialog) + return AVERROR(ENOMEM); + + { + int ret = ff_ass_split_override_codes(&ttml_callbacks, s, + dialog->text); + int log_level = (ret != AVERROR_INVALIDDATA || + avctx->err_recognition & AV_EF_EXPLODE) ? + AV_LOG_ERROR : AV_LOG_WARNING; + + if (ret < 0) { + av_log(avctx, log_level, + "Splitting received ASS dialog text %s failed: %s\n", + dialog->text, + av_err2str(ret)); + + if (log_level == AV_LOG_ERROR) { + ff_ass_free_dialog(&dialog); + return ret; + } + } + + ff_ass_free_dialog(&dialog); + } +#if FF_API_ASS_TIMING + } +#endif + } + + if (!av_bprint_is_complete(&s->buffer)) + return AVERROR(ENOMEM); + if (!s->buffer.len) + return 0; + + // force null-termination, so in case our destination buffer is + // too small, the return value is larger than bufsize minus null. + if (av_strlcpy(buf, s->buffer.str, bufsize) > bufsize - 1) { + av_log(avctx, AV_LOG_ERROR, "Buffer too small for TTML event.\n"); + return AVERROR_BUFFER_TOO_SMALL; + } + + return s->buffer.len; +} + +static av_cold int ttml_encode_close(AVCodecContext *avctx) +{ + TTMLContext *s = avctx->priv_data; + + ff_ass_split_free(s->ass_ctx); + + av_bprint_finalize(&s->buffer, NULL); + + return 0; +} + +static av_cold int ttml_encode_init(AVCodecContext *avctx) +{ + TTMLContext *s = avctx->priv_data; + + s->avctx = avctx; + + if (!(s->ass_ctx = ff_ass_split(avctx->subtitle_header))) { + return AVERROR_INVALIDDATA; + } + + if (!(avctx->extradata = av_mallocz(TTMLENC_EXTRADATA_SIGNATURE_SIZE + + 1 + AV_INPUT_BUFFER_PADDING_SIZE))) { + return AVERROR(ENOMEM); + } + + avctx->extradata_size = TTMLENC_EXTRADATA_SIGNATURE_SIZE; + memcpy(avctx->extradata, TTMLENC_EXTRADATA_SIGNATURE, + TTMLENC_EXTRADATA_SIGNATURE_SIZE); + + av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED); + + return 0; +} + +AVCodec ff_ttml_encoder = { + .name = "ttml", + .long_name = NULL_IF_CONFIG_SMALL("TTML subtitle"), + .type = AVMEDIA_TYPE_SUBTITLE, + .id = AV_CODEC_ID_TTML, + .priv_data_size = sizeof(TTMLContext), + .init = ttml_encode_init, + .encode_sub = ttml_encode_frame, + .close = ttml_encode_close, + .capabilities = FF_CODEC_CAP_INIT_CLEANUP, +}; diff --git a/libavcodec/ttmlenc.h b/libavcodec/ttmlenc.h new file mode 100644 index 0000000000..c1dd5ec990 --- /dev/null +++ b/libavcodec/ttmlenc.h @@ -0,0 +1,28 @@ +/* + * TTML subtitle encoder shared functionality + * Copyright (c) 2020 24i + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVCODEC_TTMLENC_H +#define AVCODEC_TTMLENC_H + +#define TTMLENC_EXTRADATA_SIGNATURE "lavc-ttmlenc" +#define TTMLENC_EXTRADATA_SIGNATURE_SIZE (sizeof(TTMLENC_EXTRADATA_SIGNATURE) - 1) + +#endif /* AVCODEC_TTMLENC_H */ diff --git a/libavcodec/version.h b/libavcodec/version.h index 85fbbfe766..8396d68cde 100644 --- a/libavcodec/version.h +++ b/libavcodec/version.h @@ -28,8 +28,8 @@ #include "libavutil/version.h" #define LIBAVCODEC_VERSION_MAJOR 58 -#define LIBAVCODEC_VERSION_MINOR 125 -#define LIBAVCODEC_VERSION_MICRO 101 +#define LIBAVCODEC_VERSION_MINOR 126 +#define LIBAVCODEC_VERSION_MICRO 100 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \ LIBAVCODEC_VERSION_MINOR, \ diff --git a/libavformat/Makefile b/libavformat/Makefile index fcb39ce133..330eb83796 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -545,6 +545,7 @@ OBJS-$(CONFIG_TRUEHD_DEMUXER) += rawdec.o mlpdec.o OBJS-$(CONFIG_TRUEHD_MUXER) += rawenc.o OBJS-$(CONFIG_TTA_DEMUXER) += tta.o apetag.o img2.o OBJS-$(CONFIG_TTA_MUXER) += ttaenc.o apetag.o img2.o +OBJS-$(CONFIG_TTML_MUXER) += ttmlenc.o OBJS-$(CONFIG_TTY_DEMUXER) += tty.o sauce.o OBJS-$(CONFIG_TY_DEMUXER) += ty.o OBJS-$(CONFIG_TXD_DEMUXER) += txd.o diff --git a/libavformat/allformats.c b/libavformat/allformats.c index 3b69423508..8b98c68e3b 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -444,6 +444,7 @@ extern AVInputFormat ff_truehd_demuxer; extern AVOutputFormat ff_truehd_muxer; extern AVInputFormat ff_tta_demuxer; extern AVOutputFormat ff_tta_muxer; +extern AVOutputFormat ff_ttml_muxer; extern AVInputFormat ff_txd_demuxer; extern AVInputFormat ff_tty_demuxer; extern AVInputFormat ff_ty_demuxer; diff --git a/libavformat/ttmlenc.c b/libavformat/ttmlenc.c new file mode 100644 index 0000000000..940f8bbd4e --- /dev/null +++ b/libavformat/ttmlenc.c @@ -0,0 +1,174 @@ +/* + * TTML subtitle muxer + * Copyright (c) 2020 24i + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * TTML subtitle muxer + * @see https://www.w3.org/TR/ttml1/ + * @see https://www.w3.org/TR/ttml2/ + * @see https://www.w3.org/TR/ttml-imsc/rec + */ + +#include "avformat.h" +#include "internal.h" +#include "libavcodec/ttmlenc.h" +#include "libavutil/internal.h" + +enum TTMLPacketType { + PACKET_TYPE_PARAGRAPH, + PACKET_TYPE_DOCUMENT, +}; + +typedef struct TTMLMuxContext { + enum TTMLPacketType input_type; + unsigned int document_written; +} TTMLMuxContext; + +static const char ttml_header_text[] = +"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" +"<tt\n" +" xmlns=\"http://www.w3.org/ns/ttml\"\n"; +" xmlns:ttm=\"http://www.w3.org/ns/ttml#metadata\"\n"; +" xmlns:tts=\"http://www.w3.org/ns/ttml#styling\"\n"; +" xml:lang=\"%s\">\n" +" <body>\n" +" <div>\n"; + +static const char ttml_footer_text[] = +" </div>\n" +" </body>\n" +"</tt>\n"; + +static void ttml_write_time(AVIOContext *pb, const char tag[], + int64_t millisec) +{ + int64_t sec, min, hour; + sec = millisec / 1000; + millisec -= 1000 * sec; + min = sec / 60; + sec -= 60 * min; + hour = min / 60; + min -= 60 * hour; + + avio_printf(pb, "%s=\"%02"PRId64":%02"PRId64":%02"PRId64".%03"PRId64"\"", + tag, hour, min, sec, millisec); +} + +static int ttml_write_header(AVFormatContext *ctx) +{ + TTMLMuxContext *ttml_ctx = ctx->priv_data; + ttml_ctx->document_written = 0; + + if (ctx->nb_streams != 1 || + ctx->streams[0]->codecpar->codec_id != AV_CODEC_ID_TTML) { + av_log(ctx, AV_LOG_ERROR, "Exactly one TTML stream is required!\n"); + return AVERROR(EINVAL); + } + + { + AVStream *st = ctx->streams[0]; + AVIOContext *pb = ctx->pb; + + AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL, + 0); + const char *printed_lang = (lang && lang->value) ? lang->value : ""; + + // Not perfect, but decide whether the packet is a document or not + // by the existence of the lavc ttmlenc extradata. + ttml_ctx->input_type = (st->codecpar->extradata && + st->codecpar->extradata_size >= TTMLENC_EXTRADATA_SIGNATURE_SIZE && + !memcmp(st->codecpar->extradata, + TTMLENC_EXTRADATA_SIGNATURE, + TTMLENC_EXTRADATA_SIGNATURE_SIZE)) ? + PACKET_TYPE_PARAGRAPH : + PACKET_TYPE_DOCUMENT; + + avpriv_set_pts_info(st, 64, 1, 1000); + + if (ttml_ctx->input_type == PACKET_TYPE_PARAGRAPH) + avio_printf(pb, ttml_header_text, printed_lang); + } + + return 0; +} + +static int ttml_write_packet(AVFormatContext *ctx, AVPacket *pkt) +{ + TTMLMuxContext *ttml_ctx = ctx->priv_data; + AVIOContext *pb = ctx->pb; + + switch (ttml_ctx->input_type) { + case PACKET_TYPE_PARAGRAPH: + // write out a paragraph element with the given contents. + avio_printf(pb, " <p\n"); + ttml_write_time(pb, " begin", pkt->pts); + avio_w8(pb, '\n'); + ttml_write_time(pb, " end", pkt->pts + pkt->duration); + avio_printf(pb, ">"); + avio_write(pb, pkt->data, pkt->size); + avio_printf(pb, "</p>\n"); + break; + case PACKET_TYPE_DOCUMENT: + // dump the given document out as-is. + if (ttml_ctx->document_written) { + av_log(ctx, AV_LOG_ERROR, + "Attempting to write multiple TTML documents into a " + "single document! The XML specification forbids this " + "as there has to be a single root tag.\n"); + return AVERROR(EINVAL); + } + avio_write(pb, pkt->data, pkt->size); + ttml_ctx->document_written = 1; + break; + default: + av_log(ctx, AV_LOG_ERROR, + "Internal error: invalid TTML input packet type: %d!\n", + ttml_ctx->input_type); + return AVERROR_BUG; + } + + return 0; +} + +static int ttml_write_trailer(AVFormatContext *ctx) +{ + TTMLMuxContext *ttml_ctx = ctx->priv_data; + AVIOContext *pb = ctx->pb; + + if (ttml_ctx->input_type == PACKET_TYPE_PARAGRAPH) + avio_printf(pb, ttml_footer_text); + + return 0; +} + +AVOutputFormat ff_ttml_muxer = { + .name = "ttml", + .long_name = NULL_IF_CONFIG_SMALL("TTML subtitle"), + .extensions = "ttml", + .mime_type = "text/ttml", + .priv_data_size = sizeof(TTMLMuxContext), + .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS | + AVFMT_TS_NONSTRICT, + .subtitle_codec = AV_CODEC_ID_TTML, + .write_header = ttml_write_header, + .write_packet = ttml_write_packet, + .write_trailer = ttml_write_trailer, +}; diff --git a/tests/fate/subtitles.mak b/tests/fate/subtitles.mak index 6323d0f93d..ee65afe35b 100644 --- a/tests/fate/subtitles.mak +++ b/tests/fate/subtitles.mak @@ -106,6 +106,9 @@ fate-sub-scc: CMD = fmtstdout ass -ss 57 -i $(TARGET_SAMPLES)/sub/witch.scc FATE_SUBTITLES-$(call ALLYES, MPEGTS_DEMUXER DVBSUB_DECODER DVBSUB_ENCODER) += fate-sub-dvb fate-sub-dvb: CMD = framecrc -i $(TARGET_SAMPLES)/sub/dvbsubtest_filter.ts -map s:0 -c dvbsub +FATE_SUBTITLES-$(call ALLYES, FILE_PROTOCOL PIPE_PROTOCOL SRT_DEMUXER SUBRIP_DECODER TTML_ENCODER TTML_MUXER) += fate-sub-ttmlenc +fate-sub-ttmlenc: CMD = fmtstdout ttml -i $(TARGET_SAMPLES)/sub/SubRip_capability_tester.srt + FATE_SUBTITLES-$(call ENCMUX, ASS, ASS) += $(FATE_SUBTITLES_ASS-yes) FATE_SUBTITLES += $(FATE_SUBTITLES-yes) diff --git a/tests/ref/fate/sub-ttmlenc b/tests/ref/fate/sub-ttmlenc new file mode 100644 index 0000000000..51eab97817 --- /dev/null +++ b/tests/ref/fate/sub-ttmlenc @@ -0,0 +1,122 @@ +<?xml version="1.0" encoding="utf-8"?> +<tt + xmlns="http://www.w3.org/ns/ttml"; + xmlns:ttm="http://www.w3.org/ns/ttml#metadata"; + xmlns:tts="http://www.w3.org/ns/ttml#styling"; + xml:lang=""> + <body> + <div> + <p + begin="00:00:00.000" + end="00:00:00.000">Don't show this text it may be used to insert hidden data</p> + <p + begin="00:00:01.500" + end="00:00:04.500">SubRip subtitles capability tester 1.3o by ale5000<br/>Use VLC 1.1 or higher as reference for most things and MPC Home Cinema for others<br/>This text should be blue<br/>This text should be red<br/>This text should be black<br/>If you see this with the normal font, the player don't (fully) support font face</p> + <p + begin="00:00:04.500" + end="00:00:04.500">Hidden</p> + <p + begin="00:00:04.501" + end="00:00:07.500">This text should be small<br/>This text should be normal<br/>This text should be big</p> + <p + begin="00:00:07.501" + end="00:00:11.500">This should be an E with an accent: È<br/>日本語<br/>This text should be bold, italics and underline<br/>This text should be small and green<br/>This text should be small and red<br/>This text should be big and brown</p> + <p + begin="00:00:11.501" + end="00:00:14.500">This line should be bold<br/>This line should be italics<br/>This line should be underline<br/>This line should be strikethrough<br/>Both lines<br/>should be underline</p> + <p + begin="00:00:14.501" + end="00:00:17.500">><br/>It would be a good thing to<br/>hide invalid html tags that are closed and show the text in them<br/>but show un-closed invalid html tags<br/>Show not opened tags<br/><</p> + <p + begin="00:00:17.501" + end="00:00:20.500">and also<br/>hide invalid html tags with parameters that are closed and show the text in them<br/>but show un-closed invalid html tags<br/>This text should be showed underlined without problems also: 2<3,5>1,4<6<br/>This shouldn't be underlined</p> + <p + begin="00:00:20.501" + end="00:00:21.500">This text should be in the normal position...</p> + <p + begin="00:00:21.501" + end="00:00:22.500">This text should NOT be in the normal position</p> + <p + begin="00:00:22.501" + end="00:00:24.500">Implementation is the same of the ASS tag<br/>This text should be at the<br/>top and horizontally centered</p> + <p + begin="00:00:22.501" + end="00:00:24.500">This text should be at the<br/>middle and horizontally centered</p> + <p + begin="00:00:22.501" + end="00:00:24.500">This text should be at the<br/>bottom and horizontally centered</p> + <p + begin="00:00:24.501" + end="00:00:26.500">This text should be at the<br/>top and horizontally at the left</p> + <p + begin="00:00:24.501" + end="00:00:26.500">This text should be at the<br/>middle and horizontally at the left<br/>(The second position must be ignored)</p> + <p + begin="00:00:24.501" + end="00:00:26.500">This text should be at the<br/>bottom and horizontally at the left</p> + <p + begin="00:00:26.501" + end="00:00:28.500">This text should be at the<br/>top and horizontally at the right</p> + <p + begin="00:00:26.501" + end="00:00:28.500">This text should be at the<br/>middle and horizontally at the right</p> + <p + begin="00:00:26.501" + end="00:00:28.500">This text should be at the<br/>bottom and horizontally at the right</p> + <p + begin="00:00:28.501" + end="00:00:31.500">This could be the most difficult thing to implement</p> + <p + begin="00:00:31.501" + end="00:00:50.500">First text</p> + <p + begin="00:00:33.500" + end="00:00:35.500">Second, it shouldn't overlap first</p> + <p + begin="00:00:35.501" + end="00:00:37.500">Third, it should replace second</p> + <p + begin="00:00:36.501" + end="00:00:50.500">Fourth, it shouldn't overlap first and third</p> + <p + begin="00:00:40.501" + end="00:00:45.500">Fifth, it should replace third</p> + <p + begin="00:00:45.501" + end="00:00:50.500">Sixth, it shouldn't be<br/>showed overlapped</p> + <p + begin="00:00:50.501" + end="00:00:52.500">TEXT 1 (bottom)</p> + <p + begin="00:00:50.501" + end="00:00:52.500">text 2</p> + <p + begin="00:00:52.501" + end="00:00:54.500">Hide these tags:<br/>also hide these tags:<br/>but show this: {normal text}</p> + <p + begin="00:00:54.501" + end="00:01:00.500"><br/>\ N is a forced line break<br/>\ h is a hard space<br/>Normal spaces at the start and at the end of the line are trimmed while hard spaces are not trimmed.<br/>The\hline\hwill\hnever\hbreak\hautomatically\hright\hbefore\hor\hafter\ha\hhard\hspace.\h:-D</p> + <p + begin="00:00:54.501" + end="00:00:56.500"><br/>\h\h\h\h\hA (05 hard spaces followed by a letter)<br/>A (Normal spaces followed by a letter)<br/>A (No hard spaces followed by a letter)</p> + <p + begin="00:00:56.501" + end="00:00:58.500">\h\h\h\h\hA (05 hard spaces followed by a letter)<br/>A (Normal spaces followed by a letter)<br/>A (No hard spaces followed by a letter)<br/>Show this: \TEST and this: \-)</p> + <p + begin="00:00:58.501" + end="00:01:00.500"><br/>A letter followed by 05 hard spaces: A\h\h\h\h\h<br/>A letter followed by normal spaces: A<br/>A letter followed by no hard spaces: A<br/>05 hard spaces between letters: A\h\h\h\h\hA<br/>5 normal spaces between letters: A A<br/><br/>^--Forced line break</p> + <p + begin="00:01:00.501" + end="00:01:02.500">Both line should be strikethrough,<br/>yes.<br/>Correctly closed tags<br/>should be hidden.</p> + <p + begin="00:01:02.501" + end="00:01:04.500">It shouldn't be strikethrough,<br/>not opened tag showed as text.<br/>Not opened tag showed as text.</p> + <p + begin="00:01:04.501" + end="00:01:06.500">Three lines should be strikethrough,<br/>yes.<br/>Not closed tags showed as text</p> + <p + begin="00:01:06.501" + end="00:01:08.500">Both line should be strikethrough but<br/>the wrong closing tag should be showed</p> + </div> + </body> +</tt> -- 2.29.2 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email 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