I am trying to use ffmpeg to create a video from images and add subtitles to
the video.
The following is the command that I am using
ffmpeg -f concat -i input.txt -i 02-38-2019-112729.m4a -vf
"scale=1280:720,subtitles=subtitles.srt" -pix_fmt yuv420p output.mp4
where input.txt is a text file in the following format
file 'IMG_0001.JPG'
duration 2
file 'IMG_0002.JPG'
duration 50
file 'IMG_0002.JPG'
and subtitles.srt is a subtitle file. I find that while the video is generated,
the subtitles are not present.
Can anyone point out what I am doing wrong?
The following is the ffmpeg output-
ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.1 --enable-shared
--enable-pthreads --enable-version3 --enable-hardcoded-tables
--enable-avresample --cc=clang
--host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include
-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include/darwin'
--host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom
--enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband
--enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis
--enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid
--enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r
--enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox
--disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
libavutil 56. 22.100 / 56. 22.100
libavcodec 58. 35.100 / 58. 35.100
libavformat58. 20.100 / 58. 20.100
libavdevice58. 5.100 / 58. 5.100
libavfilter 7. 40.101 / 7. 40.101
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 3.100 / 5. 3.100
libswresample 3. 3.100 / 3. 3.100
libpostproc55. 3.100 / 55. 3.100
Input #0, concat, from 'input.txt':
Duration: N/A, start: 0.00, bitrate: N/A
Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 4288x2848
[SAR 72:72 DAR 134:89], 25 tbr, 25 tbn, 25 tbc
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '02-38-2019-112729.m4a':
Metadata:
major_brand : M4A
minor_version : 0
compatible_brands: M4A mp42isom
creation_time : 2019-02-07T05:58:18.00Z
Duration: 00:00:49.09, start: 0.00, bitrate: 107 kb/s
Stream #1:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 98 kb/s (default)
Metadata:
creation_time : 2019-02-07T05:58:18.00Z
File 'output.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Stream #1:0 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[Parsed_subtitles_1 @ 0x7faed8d0a4c0] Shaper: FriBidi 1.0.5 (SIMPLE)
HarfBuzz-ng 2.3.0 (COMPLEX)
[Parsed_subtitles_1 @ 0x7faed8d0a4c0] Using font provider coretext
[swscaler @ 0x7faed9826600] deprecated pixel format used, make sure you did set
range correctly
[libx264 @ 0x7faed9007000] using SAR=603/712
[libx264 @ 0x7faed9007000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
AVX FMA3 BMI2 AVX2
[libx264 @ 0x7faed9007000] profile High, level 3.1
[libx264 @ 0x7faed9007000] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC
codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options:
cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0
deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1
sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0
constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1
open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0
rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4
ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4':
Metadata:
encoder : Lavf58.20.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661),
yuv420p(progressive), 1280x720 [SAR 603:712 DAR 134:89], q=-1--1, 25 fps, 12800
tbn, 25 tbc
Metadata:
encoder : Lavc58.35.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 128 kb/s (default)
Metadata:
creation_time : 2019-02-07T05:58:18.00Z
encoder : Lavc58.35.100 aac
More than 1000 frames duplicated 0kB time=00:00:00.00 bitrate=N/A dup=49
drop=0 speed= 0x
frame= 1349 fps= 96 q=-1.0 Lsize=1785kB time=00:00:53.84 bitrate=
271.6kbits/s dup=1346 drop=0 speed=3.84x
video:1012kB audio:744kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 1.638231%
[libx264 @
