[FFmpeg-user] Non-monotonous DTS in output stream 0:1

[Mustafa Al Ani]

Hi,

After applying the patch, it can't even find sources anymore.

Here is the console output:

ffmpeg -f libndi_newtek -find_sources 1 -i dummy -loglevel debug
ffmpeg version 3.4.git Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  configuration: --enable-libndi_newtek
--extra-cflags='-I/home/ls/iohub/ndi/include
-I/home/ls/iohub/bm_sdk/Linux/include'
--extra-ldflags=-L/home/ls/iohub/ndi/lib/x86_64-linux-gnu
--enable-libsrt --enable-ffplay --enable-decklink --enable-libx264
--enable-nonfree --enable-gpl --enable-libfdk-aac --enable-libx265
--enable-openssl
  libavutil      56. 19.100 / 56. 19.100
  libavcodec     58. 27.101 / 58. 27.101
  libavformat    58. 17.106 / 58. 17.106
  libavdevice    58.  4.101 / 58.  4.101
  libavfilter     7. 26.100 /  7. 26.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
Splitting the commandline.
Reading option '-f' ... matched as option 'f' (force format) with
argument 'libndi_newtek'.
Reading option '-find_sources' ... matched as AVOption 'find_sources'
with argument '1'.
Reading option '-i' ... matched as input url with argument 'dummy'.
Reading option '-loglevel' ... matched as option 'loglevel' (set
logging level) with argument 'debug'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input url dummy.
Applying option f (force format) with argument libndi_newtek.
Successfully parsed a group of options.
Opening an input file: dummy.
[libndi_newtek @ 0x3857380] Opening 'dummy' for reading
[file @ 0x3857c40] Setting default whitelist 'file,crypto'
dummy: No such file or directory

R,
Mustafa

On Tue, Sep 4, 2018 at 12:40 AM Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:

> 2018-09-01 20:18 GMT+02:00, Mustafa Al Ani <mustafalani at gmail.com>:
>
> > In my setup I'm playing out NDI stream using decklink. everything
> > looks good and both the NDI and the decklink playout are very
> > stable.. but when the NDI stream stops and starts again later.. the
> > decklink starts giving Non-monotonous DTS in output stream 0:1
> > which makes sense because the DTS has been changed since the
> > last frame in previous NDI stream.
> >
> > Here is my command
> >
> > fmpeg -f libndi_newtek -i "NDI_SOURCE_NAME_1" -f decklink 'DeckLink Duo
> (1)'
> >
> > The same happens when I restream NDI to NDI.
> >
> > ffmpeg -f libndi_newtek -i "NDI_SOURCE_NAME_1" -f libndi_newtek
> > NDI_SOURCE_NAME_2
> >
> > Is there any way I can force ffmpeg to ignore the DTS?
>
> You could test adding the AVFMT_TS_DISCONT flag:
> (inlined)
>
> diff --git a/libavdevice/libndi_newtek_dec.c
> b/libavdevice/libndi_newtek_dec.c
> index 4fb7197..04eec31 100644
> --- a/libavdevice/libndi_newtek_dec.c
> +++ b/libavdevice/libndi_newtek_dec.c
> @@ -337,4 +337,5 @@ AVInputFormat ff_libndi_newtek_demuxer = {
>      .read_header   = ndi_read_header,
>      .read_packet   = ndi_read_packet,
>      .read_close    = ndi_read_close,
> +    .flags         = AVFMT_TS_DISCONT,
>  };
>
>
> Please report back, Carl Eugen
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