FFMPEG UDP stream broken with DVB_SUBTITLE's

[NPeca]

Summary of the bug:
FFMPEG output stream with dvb_subtitles broken

I have HTTP stream which I like to convert to UDP:

​http://192.168.1.44:8001/1:0:1:1F8:1B:2C0:E080000:0:0:0:

The Video, Audio and Subtitle work perfectly If I try to open this stream in VLC, DragonPlayer, SMPlayer in Ubuntu.
So far, so good

Here is otput of FFPROBE

ffprobe -i http://192.168.1.44:8001/1:0:1:1F8:1B:2C0:E080000:0:0:0:
ffprobe version git-2017-01-22-f1214ad Copyright (c) 2007-2017 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
  libavutil      55. 44.100 / 55. 44.100
  libavcodec     57. 75.100 / 57. 75.100
  libavformat    57. 63.100 / 57. 63.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 69.100 /  6. 69.100
  libavresample   3.  2.  0 /  3.  2.  0
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
[mpeg2video @ 0xa56fde0] Invalid frame dimensions 0x0.
    Last message repeated 2 times
Input #0, mpegts, from 'ht tp://192.168.1.44:8001/1:0:1:1F8:1B:2C0:E080000:0:0:0:':                                                                                                         
  Duration: N/A, start: 35782.514200, bitrate: N/A                                                                                                                                         
  Program 501                                                                                                                                                                             
  Program 502                                                                                                                                                                             
  Program 503                                                                                                                                                                             
  Program 504                                                                                                                                                                             
    Stream #0:0[0x13b1]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc                           
    Stream #0:1[0x13b2]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 256 kb/s                                                                                             
    Stream #0:2[0x1541](srp): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)                                                                                                               
    Stream #0:3[0x1542](slv): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)                                                                                                               
    Stream #0:4[0x1543](hrv): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)                                                                                                               
    Stream #0:5[0x1544](cze): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)                                                                                                               
    Stream #0:6[0x1545](hun): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)                                                                                                               
    Stream #0:7[0x1546](ron): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)                                                                                                               
    Stream #0:8[0x1547](alb): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)                                                                                                               
    Stream #0:9[0x1548](bul): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)                                                                                                               
    Stream #0:10[0x13b9](eng): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)                                                                                                             
  Program 505                                                                                                                                                                             
  Program 506
  Program 507
  Program 508
  Program 509
  Program 510
  Program 511
  Program 515
  Program 516
  Program 517
  Program 518
  Program 519
  Program 520
  Program 521
Unsupported codec with id 94215 for input stream 10

So I decide to use FFMPEG to stream to UDP, and filter out unwanted SUB's

Here is FFMPEG cmd

ffmpeg -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2048 \
    -i "http://192.168.1.44:8001/1:0:1:1F8:1B:2C0:E080000:0:0:0:" \
    -map 0:0 -vcodec copy \
    -map 0:1 -acodec copy \
    -map 0:2 -map 0:6 -scodec copy \
    -f mpegts udp://239.0.10.3:40000?pkt_size=1316

OUTPUT:

Output #0, mpegts, to 'udp://239.0.10.3:40000?pkt_size=1316':
  Metadata:
    encoder         : Lavf57.63.100
    Stream #0:0: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], q=2-31, 25 fps, 25 tbr, 90k tbn, 90k tbc
    Stream #0:1: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 256 kb/s
    Stream #0:2(srp): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    Stream #0:3(hun): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
  Stream #0:2 -> #0:2 (copy)
  Stream #0:6 -> #0:3 (copy)

RESULT:
Resulting stream is disaster, Video fall apart, audio skipping, unusable

If i try same thing WITHOUT dvb_subtitle stream, only Video (0) and Audio (1) everything work fine. Crystal clear picture and nice audio
If i map one or more SUB's, no matter which or how many, UDP stream is unusable

To narrow down the problem, i tried to record input stream in file

ffmpeg -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2048 \
-i "http://192.168.1.44:8001/1:0:1:1F8:1B:2C0:E080000:0:0:0:" \
-map 0:0 -map 0:1 -map 0:2 -map 0:6 \
-codec copy \
-y -f mpegts /tmp/tst.ts

resulting file is playable, video ok, audio ok, subtitles ok

and if i try to "burn" one subtitle on video

ffmpeg -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2048 \
    -f mpegts -i "http://192.168.1.43:8001/1:0:1:1F8:1B:2C0:E080000:0:0:0:" \
    -vcodec mpeg2video -s 720x576 -r 25 -qmax 30 \
    -b:v 2M -minrate:v 2M -maxrate:v 2M -bufsize:v 1.4M \
    -filter_complex "[0:v][0:s:0]overlay[v]" -map "[v]" \
    -map 0:1 -acodec copy \
    -f mpegts udp://239.0.10.3:40000?pkt_size=1316

everything is ok, sub is burned, video is ok, audio is ok.

So, i think there is something terribly wrong with UDP / TS muxing when dvb_subtitle streams is included in output

about FFMPEG versions
i tried this on Centos 5, Ubuntu 14.04, tried to compile from source, same things

about my network
Computer is strong enough to handle FFMPEG
ETH0 (input) is gigabit
ETH1 (outut) is gigabit
there is NO wireless in network
there is NO other equipment on network, only source, computer and receiver

any solution for this ?
I really need this two subtitle stream to be broadcast along with video / audio

tnx

[Carl Eugen Hoyos]

Do you think this is a regression?

[Carl Eugen Hoyos]

Please provide an input sample stream.

[slasktrat]

I experience the exact same issue. What I try to do is downscale the video track of a multicast transport stream and re-stream it with all other elementary streams untouched. And all is good as long as there is no dvbsub tracks involved.

I've uploaded a sample file and the issue can be reproduced using this command:

ffmpeg -re -i dvbsub_udp_issue_6165.ts -map 0 -c copy -f mpegts udp://@239.1.1.1:1234

Playback is choppy and seem to struggle every time a subtitle "times out"/should disappear

If I exclude the subtitle track, playback is fine without issues

ffmpeg -re -i dvbsub_udp_issue_6165.ts -map 0 -map -0:s -c copy -f mpegts udp://@239.1.1.1:1234

[contremaitre]

This bug is still here.
I can provide a new sample if necessary, but upload.ffmpeg.org does not work.

[Gregor Fuis]

This issue is still present in the latest FFmpeg. Is there anyone interested in checking this out? I can provide a sample with the command line I use to repeat the issue.