Hi, I am a new ffmpeg user. I like it very much. I got a subtitle livestreaming problem though.
Basically, I like to livestream a customized subtitles together with audio/video mp4 file. The subtitle track has to be a separate one (cannot be hardcoded or burned into the video data. I know how to burn but I don't want that as the user at the client side may change the subtitles). I have recently asked a question on ffmpeg livestreaming with subtitles <http://ffmpeg.gusari.org/viewtopic.php?f=11&t=2115> in ffmpeg developer forum but was suggested that I asked the question on how to livestream subtitles with ffmpeg here. Please help. Here is the current status, * Already added subtitles to "india_sub_srt.mp4" using ffmpeg successfully. Using a vlc player to play the file, I can see the newly added subtitles. * I am using an octoshape sever. The server set up was fine. If I use "-f flv" instead of "-f mpegts" as the output container (see below), I can stream successfully. However, "flv" does not support subtitle livestream. I also tried "mp4", "mov" as an output format but got an error message saying those are not seekable formats. * Followed a couple of suggestions I got from the aforementioned post and was able to see ffmpeg processing audo, video, and even subtitle for streaming but there was a conversion failure. I wonder: does it mean the current ffmpeg does not support or I need to use some other format? Please see below for my screen print-outs. Command: ffmpeg -re -i india_sub_srt.mp4 -c:v libx264 -preset fast -maxrate 500k -bufsize 4000k -pix_fmt yuv420p -g 50 -c:a copy -c:s copy -f mpegts rtmp://localhost/live/livestream Screen print-out: ffmpeg version N-71481-g1c37848 Copyright (c) 2000-2015 the FFmpeg developers built with gcc 4.9.2 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca -- enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena ble-decklink --enable-zlib libavutil 54. 22.101 / 54. 22.101 libavcodec 56. 34.100 / 56. 34.100 libavformat 56. 30.100 / 56. 30.100 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 14.100 / 5. 14.100 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 3.100 / 53. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'india_sub_srt.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf56.30.100 Duration: 00:04:59.86, start: 0.000000, bitrate: 309 kb/s Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yu v420p(tv, bt709), 320x180, 209 kb/s, 25 fps, 25 tbr, 90k tbn, 180k tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, flt p, 95 kb/s (default) Metadata: handler_name : SoundHandler Stream #0:2(und): Subtitle: mov_text (tx3g / 0x67337874), 0 kb/s (default) Metadata: handler_name : SubtitleHandler [libx264 @ 040cbe60] using cpu capabilities: MMX2 SSE2Fast LZCNT [libx264 @ 040cbe60] profile High, level 2.1 Output #0, mpegts, to 'rtmp://localhost/live/livestream': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf56.30.100 Stream #0:0(und): Video: h264 (libx264), yuv420p, 320x180, q=-1--1, max. 500 kb/s, 25 fps, 90k tbn, 25 tbc (default) Metadata: handler_name : VideoHandler encoder : Lavc56.34.100 libx264 Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, 95 kb/s (default) Metadata: handler_name : SoundHandler Stream #0:2(und): Subtitle: mov_text (tx3g / 0x67337874), 0 kb/s (default) Metadata: handler_name : SubtitleHandler Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264)) Stream #0:1 -> #0:1 (copy) Stream #0:2 -> #0:2 (copy) Press [q] to stop, [?] for help frame= 12 fps=0.0 q=0.0 size= 0kB time=00:00:00.55 bitrate= 0.0kbits/s frame= 25 fps= 25 q=0.0 size= 0kB time=00:00:01.04 bitrate= 0.0kbits/s frame= 37 fps= 24 q=0.0 size= 0kB time=00:00:01.57 bitrate= 0.0kbits/s frame= 50 fps= 25 q=28.0 size= 11kB time=00:00:02.06 bitrate= 42.9kbits/ frame= 63 fps= 25 q=28.0 size= 22kB time=00:00:02.56 bitrate= 70.5kbits/ WriteN, RTMP send error 10053 (129 bytes)B time=00:02:18.53 bitrate= 242.1kbits/s WriteN, RTMP send error 10053 (45 bytes) WriteN, RTMP send error 10038 (42 bytes) av_interleaved_write_frame(): Operation not permitted frame= 3467 fps= 25 q=-1.0 Lsize= 4103kB time=00:02:18.77 bitrate= 242.2kbits/s video:1942kB audio:1627kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 14.971242% [libx264 @ 040cbe60] frame I:86 Avg QP:17.47 size: 5505 [libx264 @ 040cbe60] frame P:1434 Avg QP:21.71 size: 814 [libx264 @ 040cbe60] frame B:1947 Avg QP:23.42 size: 178 [libx264 @ 040cbe60] consecutive B-frames: 21.3% 8.8% 8.2% 61.7% [libx264 @ 040cbe60] mb I I16..4: 12.0% 49.7% 38.3% [libx264 @ 040cbe60] mb P I16..4: 0.8% 1.8% 0.9% P16..4: 37.5% 12.7% 5.5% 0.0% 0.0% skip:40.8% [libx264 @ 040cbe60] mb B I16..4: 0.5% 0.5% 0.1% B16..8: 17.4% 3.4% 0.1% direct: 4.3% skip:73.6% L0:46.0% L1:44.8% BI: 9.2% [libx264 @ 040cbe60] 8x8 transform intra:49.2% inter:60.0% [libx264 @ 040cbe60] coded y,uvDC,uvAC intra: 53.3% 67.6% 36.2% inter: 7.9% 12.5% 0.3% [libx264 @ 040cbe60] i16 v,h,dc,p: 40% 24% 20% 16% [libx264 @ 040cbe60] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 15% 27% 3% 5% 5% 5% 5% 5% [libx264 @ 040cbe60] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 43% 14% 13% 4% 6% 6% 6% 4% 4% [libx264 @ 040cbe60] i8c dc,h,v,p: 50% 19% 25% 6% [libx264 @ 040cbe60] Weighted P-Frames: Y:1.3% UV:0.5% [libx264 @ 040cbe60] ref P L0: 78.4% 21.6% [libx264 @ 040cbe60] ref B L0: 85.1% 14.9% [libx264 @ 040cbe60] ref B L1: 95.4% 4.6% [libx264 @ 040cbe60] kb/s:114.71 Conversion failed! 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