10 replies to this topic

[Youpla]

Hello,

Did anyone manage to successfully recompress a film including DVB subtitles ?
 

I own a VU+ DUO² with a DVB-T tuner and I'm willing to compress some of my recorded movies (french numeric TV) for archiving.

These movies are MPEGTS files with, typically, one video stream, 3 audio streams, and 2 subtitle streams (DVD subtitles for hearing impaired and DVB subtitles).

Let's say I want to compress and remux video stream + audio streams n°1 and n°0 + DVB subtitles.
I would use the following command line :

./ffmpeg -i input.ts -map 0:v:0 -map 0:a:1 -map 0:a:0 -map 0:s:1 -vcodec h264 -acodec aac -scodec copy out.ts

I can check with ffprobe that everything is correctly muxed :

./ffprobe out.ts

Input #0, mpegts, from '.\out.ts':
  Duration: 00:01:02.52, start: 1.400000, bitrate: 3173 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
  Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn
  Stream #0:1[0x101](qaa): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 130 kb/s
  Stream #0:2[0x102](fra): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 130 kb/s
  Stream #0:3[0x103](fra): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)

And when I play the file on my PC with VLC, all streams are working fine, including subtitles   

BUT when I play the file on my Duo², the subtitles don't work. I mean I can select them in the menu but they won't display

 

My system is OpenPLI 7.3 with default media player.
Does anyone understand why media player won't display DVB Subtitles while VLC does ?

 

Optional question : what is the name of the process in charge of playing videos in OpenPLI ?

Thx.

Edited by Youpla, 22 April 2022 - 14:19.

[WanWizard]

There is only one process: enigma2, which runs the GUI and does everything. It uses gstreamer to read media files and translates them to something suitable for the dvbmediasink.

[40H3X]

So you want to compress with h264? Are you a Windows user ?

[Taykun345]

Have you also tried some other media player like MPC? VLC can mask a possible problem.

[scriptmelvin †]

I tried with a h264 input file (shouldn't matter) and it works fine (on OpenPLi 8.1). It takes about 15 seconds though for the subtitles to kick in after turning them on. If I then "reset playback position" and replay, subtitle display is instantaneous.

[Youpla]

There is only one process: enigma2, which runs the GUI and does everything. It uses gstreamer to read media files and translates them to something suitable for the dvbmediasink.

 

Thank you, maybe I should submit my problem to gstreamer developers ?

 

So you want to compress with h264? Are you a Windows user ?

 

I want to compress AND keep the DVB subtitles in a separated stream. I also want to keep multiple audio streams but that I manage.
I'am a windows user but I also have linux in Vitual Machine.

 

Have you also tried some other media player like MPC? VLC can mask a possible problem.

 

I just made the test with MPC and it worked at first try with absolutely no warning. Thanks for the idea.


For those who would be willing to test by themselves, I made a 1 minute (25MB) file which is the result of the above command line.
VLC and MPC can play subtitles, but my Duo² can't.

https://drive.google...iew?usp=sharing

[Youpla]

I tried with a h264 input file (shouldn't matter) and it works fine (on OpenPLi 8.1). It takes about 15 seconds though for the subtitles to kick in after turning them on. If I then "reset playback position" and replay, subtitle display is instantaneous.

 

I know Enigma2 takes some time to display subtitles sometime, so I waited way more than 15 seconds to be sure.

Can you test to file I provided in my previous message, select the subtitles and tell me if they show in your device ?

Edited by Youpla, 22 April 2022 - 16:44.

[scriptmelvin †]

Can you test to file I provided in my previous message, select the subtitles and tell me if they show in your device ?

I tried your file. Subs kick in 15 seconds after turning them on. On OpenPLi 8.1. When I stop playback, "reset playback position" and replay, subs display is instantaneous.

[Youpla]

Can you test to file I provided in my previous message, select the subtitles and tell me if they show in your device ?

I tried your file. Subs kick in 15 seconds after turning them on. On OpenPLi 8.1. When I stop playback, "reset playback position" and replay, subs display is instantaneous.

 

 

oh... that's unexpected. Thanks for doing the test.
I hope upgrading to 8.1 will solve the problem then.

I'll update the topic when it's done (later).

[Youpla]

 

Can you test to file I provided in my previous message, select the subtitles and tell me if they show in your device ?

I tried your file. Subs kick in 15 seconds after turning them on. On OpenPLi 8.1. When I stop playback, "reset playback position" and replay, subs display is instantaneous.

 

 

I updated to 8.1 and the subtitles still don't display. I flashed a second time and asked not to restore my settings, still no success.

Is it possible that the problem is specific to the Duo² ?

[scriptmelvin †]

Is it possible that the problem is specific to the Duo² ?

I guess it's possible. As far as I know (someone correct me if I'm wrong) subs are displayed on the frame buffer, which has a finite number of layers. The number of layers might differ between boxes. I doubt that the Duo² doesn't have enough layers for subs, though.

 

I do have ServiceApp installed, that also might make a difference.