Open 3052 opened 5 months ago
@3052 Is there a publicly available sample file with this subtitle type? Does this subtitle type work with any known player (vlc or ffplay)?
@3052 ffmpeg doesn't have a decoder for ttml, and as my player depends on ffmpeg API for demuxing/decoding -- ttml subtitles most likely are not going to be supported until they are supported by ffmpeg.
ffplay version N-114162-g2129d66a66 Copyright (c) 2003-2024 the FFmpeg developers
built with Apple clang version 14.0.0 (clang-1400.0.29.202)
configuration: --prefix=/Users/pavel/x86_64 --disable-debug --enable-libx264 --enable-libzimg --enable-libass --enable-libbluray --enable-libmodplug --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-runtime-cpudetect --extra-cflags=-I/opt/local/include --extra-ldflags='-headerpad_max_install_names -L/opt/local/lib'
libavutil 59. 1.100 / 59. 1.100
libavcodec 61. 1.101 / 61. 1.101
libavformat 61. 0.100 / 61. 0.100
libavdevice 61. 0.100 / 61. 0.100
libavfilter 10. 0.100 / 10. 0.100
libswscale 8. 0.100 / 8. 0.100
libswresample 5. 0.100 / 5. 0.100
libpostproc 58. 0.100 / 58. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/out.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf61.0.100
Duration: 03:53:20.06, start: 0.000000, bitrate: 1331 kb/s
Stream #0:0[0x1](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 159 kb/s (default)
Metadata:
handler_name : SoundHandler
vendor_id : [0][0][0][0]
Stream #0:1[0x2](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709, progressive), 720x480 [SAR 8:9 DAR 4:3], 1165 kb/s, 23.98 fps, 23.98 tbr, 16k tbn (default)
Metadata:
handler_name : VideoHandler
vendor_id : [0][0][0][0]
Stream #0:2[0x3](eng): Subtitle: ttml (stpp / 0x70707473), 1 kb/s (default)
Metadata:
handler_name : USP Subtitle Handler
No decoder could be found for codec ttml
7.61 A-V: -0.002 fd= 1 aq= 34KB vq= 13KB sq= 0B
yeah, seems like support for TTML is pretty crappy at this time, missing from FFmpeg and MPV. as a workaround, it seems WebVTT is pretty common with better support:
I have the below file, the subtitles will not load