Support subtitles and drawtext filter.

.gitignore

@@ -1,3 +1,17 @@
 .idea
 ffmpeg-5.0.2
-libass-0.17.1
+libass-0.17.1
+fribidi-1.0.13
+freetype-2.13.2
+harfbuzz-8.3.0
+expat-2.5.0
+fontconfig-2.14.2
+libpng-1.6.40
+*.ttf
+*.srt
+*.txt
+ffmpeg-5.0.2
+ffmpeg-5.0.2-libass
+ffmpeg-5.0.2-nolibass
+.DS_Store
+source.flv

Dockerfile

@@ -20,6 +20,11 @@ RUN echo "BUILDPLATFORM: $BUILDPLATFORM, TARGETPLATFORM: $TARGETPLATFORM, TARGET
 
 WORKDIR /tmp/srs
 
+# See https://fonts.google.com/noto/specimen/Noto+Sans+TC
+ADD NotoSansTC-Regular.tar.bz2 /usr/local/share/fonts/
+# See https://fonts.google.com/specimen/Roboto
+ADD Roboto-Regular.tar.bz2 /usr/local/share/fonts/
+
 # Copy all FFmpeg versions and cmake and other tools in /usr/local.
 COPY --from=build /usr/local /usr/local
 COPY --from=build /usr/local/bin/ffmpeg4 /usr/local/bin/ffprobe4 /usr/local/bin/

Dockerfile.base3

@@ -22,7 +22,7 @@ RUN apt-get update && \
     apt-get install -y aptitude gcc g++ make patch unzip python \
         autoconf automake libtool pkg-config zlib1g-dev \
         liblzma-dev libzip-dev libbz2-dev tcl \
-        libfreetype6-dev libfribidi-dev libharfbuzz-dev libfontconfig1-dev
+        gperf python3
 
 # Libs path for app which depends on ssl, such as libsrt.
 ENV PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/ssl/lib/pkgconfig
@@ -64,7 +64,33 @@ RUN if [[ $TARGETPLATFORM != 'linux/arm/v7' ]]; then \
         cmake -DENABLE_SHARED=OFF ../../source && make -j${JOBS} && make install; \
     fi
 
-# Cost: x.s
+# Cost: xs
+ADD libpng-1.6.40.tar.gz /tmp
+RUN cd /tmp/libpng-1.6.40 && ./configure --disable-shared --enable-static && make -j${JOBS} && make install
+
+# Cost: xs
+ADD fribidi-1.0.13.tar.bz2 /tmp
+RUN cd /tmp/fribidi-1.0.13 && ./configure --disable-shared --enable-static && make -j${JOBS} && make install
+
+# Cost: xs
+ADD harfbuzz-8.3.0.tar.bz2 /tmp
+RUN cd /tmp/harfbuzz-8.3.0 && ./configure --disable-shared --enable-static && make -j${JOBS} && make install
+
+# Cost: xs
+# Depends on libpng.
+ADD freetype-2.13.2.tar.gz /tmp
+RUN cd /tmp/freetype-2.13.2 && ./configure --disable-shared --enable-static && make -j${JOBS} && make install
+
+# Cost: xs
+ADD expat-2.5.0.tar.bz2 /tmp
+RUN cd /tmp/expat-2.5.0 && ./configure --disable-shared --enable-static && make -j${JOBS} && make install
+
+# Cost: xs
+# Depends on gperf, expat, freetype.
+ADD fontconfig-2.14.2.tar.bz2 /tmp
+RUN cd /tmp/fontconfig-2.14.2 && ./configure --disable-shared --enable-static && make -j${JOBS} && make install
+
+# Cost: 130.9s
 # For libass, which depends on libfreetype6-dev, libfribidi-dev, libharfbuzz-dev, libfontconfig1-dev.
 ADD libass-0.17.1.tar.gz /tmp
 RUN cd /tmp/libass-0.17.1 && ./configure --disable-shared --enable-static && make -j${JOBS} && make install

Dockerfile.base50

@@ -21,8 +21,7 @@ ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && \
     apt-get install -y aptitude gcc g++ make patch unzip python \
         autoconf automake libtool pkg-config zlib1g-dev \
-        liblzma-dev libzip-dev libbz2-dev tcl \
-        libfreetype6-dev libfribidi-dev libharfbuzz-dev libfontconfig1-dev
+        liblzma-dev libzip-dev libbz2-dev tcl
 
 # Libs path for app which depends on ssl, such as libsrt.
 ENV PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/ssl/lib/pkgconfig
@@ -51,6 +50,7 @@ RUN FFOPTIONS=""; if [[ $TARGETPLATFORM != 'linux/arm/v7' ]]; then \
         --enable-libx264 --enable-libmp3lame --enable-libfdk-aac \
         --enable-libxml2 --enable-demuxer=dash \
         --enable-openssl --enable-protocol=tls --enable-protocol=rtmps \
+        --enable-filter=drawtext --enable-libfreetype --enable-libfontconfig \
         --enable-libass \
         --enable-libsrt ${FFOPTIONS} && \
     make -j${JOBS} && make install && echo "FFmpeg5 build and install successfully"

Dockerfile.base51

@@ -12,7 +12,7 @@ ARG JOBS=2
 RUN echo "BUILDPLATFORM: $BUILDPLATFORM, TARGETPLATFORM: $TARGETPLATFORM, JOBS: $JOBS"
 
 # https://serverfault.com/questions/949991/how-to-install-tzdata-on-a-ubuntu-docker-image
-ENV DEBIAN_FRONTEND noninteractive
+ENV DEBIAN_FRONTEND=noninteractive
 
 # Update the mirror from aliyun, @see https://segmentfault.com/a/1190000022619136
 #ADD sources.list /etc/apt/sources.list
@@ -24,11 +24,11 @@ RUN apt-get update && \
         liblzma-dev libzip-dev libbz2-dev tcl
 
 # Libs path for app which depends on ssl, such as libsrt.
-ENV PKG_CONFIG_PATH $PKG_CONFIG_PATH:/usr/local/ssl/lib/pkgconfig
+ENV PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/ssl/lib/pkgconfig
 
 # Libs path for FFmpeg(depends on serval libs), or it fail with:
 #       ERROR: speex not found using pkg-config
-ENV PKG_CONFIG_PATH $PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/local/lib64/pkgconfig
+ENV PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/local/lib64/pkgconfig
 
 # To use if in RUN, see https://github.com/moby/moby/issues/7281#issuecomment-389440503
 # Note that only exists issue like "/bin/sh: 1: [[: not found" for Ubuntu20, no such problem in CentOS7.
@@ -52,6 +52,8 @@ RUN FFOPTIONS=""; if [[ $TARGETPLATFORM != 'linux/arm/v7' ]]; then \
         --enable-libx264 --enable-libmp3lame --enable-libfdk-aac \
         --enable-libxml2 --enable-demuxer=dash \
         --enable-openssl --enable-protocol=tls --enable-protocol=rtmps \
+        --enable-filter=drawtext --enable-libfreetype --enable-libfontconfig \
+        --enable-libass \
         --enable-libsrt ${FFOPTIONS} && \
     make -j${JOBS} && make install && echo "FFmpeg5(HEVC over RTMP) build and install successfully"
 #  We copy FFmpeg5 without HEVC over RTMP as target, to make the next step easy to use.