Think I found the reason why .sub subtitles doesn't play when transcoding...

January 3, 2015

Hi , playing movies with idx/sub over dlna has never worked for me, I been using the latest dev build and every time I try to play a movie with sub/idx my tv respond with a "format not supported" error. Playing the same movie with a srt subtitle works just fine.

The reason that sub/idx doesn't work is that the transcoding is failing when it cant find the .sub file when the path contains a whitespace as the cmdline reference -i isn't inclosed in "-marks. The last row in the transcoding log tells the tale.(see example below)

I guess this would be an easy thing to fix ?

C:\Users\KAKA123\AppData\Roaming\MediaBrowser-Server\ffmpeg\20141111\ffmpeg.exe -fflags +genpts -i file:"\\BOX\HDMOVIES\The Identical\The.Identical.2014.720p.BluRay.x264-ROVERS.mkv" -i \\BOX\HDMOVIES\The Identical\The.Identical.2014.720p.BluRay.x264-ROVERS.sub -map 0:0 -map 0:1 -map 1:0 -sn -codec:v:0 libx264 -force_key_frames expr:gte(t,n_forced*5) -preset superfast -crf 23 -maxrate 7363491 -bufsize 14726982 -vsync vfr -level 41 -filter_complex "[1:0]format=yuva444p,scale=1280:528,lut=u=128:v=128:y=gammaval(.3)_{; [0:0]}_{_{overlay,scale=trunc(min(iw\,1920)/2)*2:trunc(min((iw/dar)\,1080)/2)*2" -map_metadata -1 -threads 2 -codec:a:0 ac3 -ac 6 -ab 320000 -af "aresample=async=1" -y "C:\Users\KAKA123\AppData\Roaming\MediaBrowser-Server\transcoding-temp\streaming\270773ba3ea480678902893d63bbf6c0.ts"}}

_{_{built on Nov 11 2014 01:15:40 with gcc 4.9.2 (GCC)}}

_{_{configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-zlib}}

_{_{libavutil 54. 11.100 / 54. 11.100}}

_{_{libavcodec 56. 12.100 / 56. 12.100}}

_{_{libavformat 56. 12.103 / 56. 12.103}}

_{_{libavdevice 56. 2.100 / 56. 2.100}}

_{_{libavfilter 5. 2.103 / 5. 2.103}}

_{_{libswscale 3. 1.101 / 3. 1.101}}

_{_{libswresample 1. 1.100 / 1. 1.100}}

_{_{libpostproc 53. 3.100 / 53. 3.100}}

_{_{Input #0, matroska,webm, from 'file:\\BOX\HDMOVIES\The Identical\The.Identical.2014.720p.BluRay.x264-ROVERS.mkv':}}

_{_Metadata:}

_{_{encoder : libebml v1.3.0 + libmatroska v1.4.0}}

_{_{creation_time : 2014-12-30 00:28:26}}

_{_{Duration: 01:46:08.33, start: 0.000000, bitrate: 7363 kb/s}}

_{_{Chapter #0:0: start 0.000000, end 774.107000}}

_{_Metadata:}

_{_{title : 00:00:00.000}}

_{_{Chapter #0:1: start 774.107000, end 1782.322000}}

_{_Metadata:}

_{_{title : 00:12:54.107}}

_{_{Chapter #0:2: start 1782.322000, end 2757.922000}}

_{_Metadata:}

_{_{title : 00:29:42.322}}

_{_{Chapter #0:3: start 2757.922000, end 3403.317000}}

_{_Metadata:}

_{_{title : 00:45:57.922}}

_{_{Chapter #0:4: start 3403.317000, end 4152.231000}}

_{_Metadata:}

_{_{title : 00:56:43.317}}

_{_{Chapter #0:5: start 4152.231000, end 4859.897000}}

_{_Metadata:}

_{_{title : 01:09:12.231}}

_{_{Chapter #0:6: start 4859.897000, end 5898.184000}}

_{_Metadata:}

_{_{title : 01:20:59.897}}

_{_{Chapter #0:7: start 5898.184000, end 6368.331000}}

_{_Metadata:}

_{_{title : 01:38:18.184}}

_{_{Stream #0:0(eng): Video: h264 (High), yuv420p, 1280x528 [sAR 1:1 DAR 80:33], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)}}

_{_{Stream #0:1(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s (default)}}

_{_{\\BOX\HDMOVIES\The: No such file or directory}}

January 3, 2015

good job

January 9, 2015

Hi Luke and other devs !

I had a look at the code myself to see if I could solve it. MediaBrowser.MediaEncoding/Encoder/BaseEncoder.cs

By modifying the argument builder like below the problem would be solved , unless you see a better way to you think this could be implementet in the next dev build or so ?

       protected string GetInputArgument(EncodingJob job)
        {
            var arg = "-i " + GetInputPathArgument(job);


            if (job.SubtitleStream != null)
            {
                if (job.SubtitleStream.IsExternal && !job.SubtitleStream.IsTextSubtitleStream)
                {
                    arg += " -i \"" + job.SubtitleStream.Path + "\"";
                }
            }


            return arg;
        }

January 10, 2015

what exactly was the change? that code is actually brand new and is not being used yet.

January 10, 2015

this is what playback is using. we are actually already doing this.

https://github.com/MediaBrowser/MediaBrowser/blob/master/MediaBrowser.Api/Playback/BaseStreamingService.cs#L829

the subs are burned in however the resolution is wrong. the subs need to be resized to match the output size of the video. if you look at the transcoding log you'll see debug messages about that.

January 10, 2015

Hi , maybe I was unclear but as I understand it , the problem is that ffmpeg can't find .sub file.

the cmdline should be like this with " surrounding the path to the .sub file:

ffmpeg.exe -fflags +genpts -i file:"\\BOX\HDMOVIES\The Identical\The.Identical.2014.720p.BluRay.x264-ROVERS.mkv" -i "\\BOX\HDMOVIES\The Identical\The.Identical.2014.720p.BluRay.x264-ROVERS.sub" -map 0:0 -map 0:1 -map 1:0 -sn -codec:v:0 libx264 -force_key_frames expr:gte(t,n_forced*5) -preset superfast -crf 23 -maxrate 7363491 -bufsize 14726982 -vsync vfr -level 41 -filter_complex "[1:0]format=yuva444p,scale=1280:528,lut=u=128:v=128:y=gammaval(.3)_{; [0:0]}_{_{overlay,scale=trunc(min(iw\,1920)/2)*2:trunc(min((iw/dar)\,1080)/2)*2" -map_metadata -1 -threads 2 -codec:a:0 ac3 -ac 6 -ab 320000 -af "aresample=async=1" -y "C:\Users\KAKA123\AppData\Roaming\MediaBrowser-Server\transcoding-temp\streaming\270773ba3ea480678902893d63bbf6c0.ts"}}

January 10, 2015

I see now that the the " is indeed fixed in the latest builds ( running Version 3.0.5488.1547), now ffmpeg doesn't crash but it seams to be another problem with .sub transcoding. Subtitles doesn't show and the log is full of lines like this one.

frame= 8547 fps=200 q=23.0 size= 115531kB time=00:05:56.76 bitrate=2652.8kbits/s

sub2video: rectangle overflowing

Last message repeated 1 times

frame= 8651 fps=200 q=23.0 size= 116414kB time=00:06:01.11 bitrate=2640.9kbits/s

sub2video: rectangle overflowing

Last message repeated 1 times

frame= 8756 fps=200 q=23.0 size= 117597kB time=00:06:05.43 bitrate=2636.2kbits/s

sub2video: rectangle overflowing

Last message repeated 1 times

maybe thats the resize problem you talk about ?

I googled and it seams to be a common problem.

Anyway , good work to all you devs!

Edited January 10, 2015 by HomerS

January 23, 2015

I see now that the the " is indeed fixed in the latest builds ( running Version 3.0.5488.1547), now ffmpeg doesn't crash but it seams to be another problem with .sub transcoding. Subtitles doesn't show and the log is full of lines like this one.

frame= 8547 fps=200 q=23.0 size= 115531kB time=00:05:56.76 bitrate=2652.8kbits/s

sub2video: rectangle overflowing

Last message repeated 1 times

frame= 8651 fps=200 q=23.0 size= 116414kB time=00:06:01.11 bitrate=2640.9kbits/s

sub2video: rectangle overflowing

Last message repeated 1 times

frame= 8756 fps=200 q=23.0 size= 117597kB time=00:06:05.43 bitrate=2636.2kbits/s

sub2video: rectangle overflowing

Last message repeated 1 times

maybe thats the resize problem you talk about ?

I googled and it seams to be a common problem.

Anyway , good work to all you devs!

Yes .sub-based subtitles need to be resized to match the video. If someone can research the command for that, then we can incorporate the fix.

January 23, 2015

I had a go at finding some solution , but to me it looks like this is a bug in ffmepg and it has not been fixed

https://trac.ffmpeg.org/ticket/2741

January 23, 2015

no, i don't think so. we have to use a resize filter to make the subtitle size match the size of the output video. i just don't know what the command line for it is yet.

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Think I found the reason why .sub subtitles doesn't play when transcoding...

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