[FFmpeg-user] Decklink with ffmpeg audio desync

[Dpto. Datos Television Costa Blanca]

Hi Again,

Nobody had this problem before or know how to fix it?

Thanks in advance,

--Daniel B.


El 28/04/2016 a las 10:41, Dpto. Datos Television Costa Blanca escribió:
> Hello everyone,
>
> Im Daniel and Im new to the list.
>
> Im doing an mpeg2 ts over multicast with a Decklink SDI 4K as input.
> After some random time, audio and video start desyncing. Its start just
> a little bit at first for desyn start growing over time..
>
> This is the command Im using and the initial output.
>
> ./ffmpeg -re -f decklink -i "DeckLink SDI 4K at 2" -c:v mpeg2video -pix_fmt
> yuv420p -aspect 16:9 -deinterlace -sc_threshold 1000000000 -b:v 3.5M
> -minrate:v 3.5M -maxrate:v 3.5M -bufsize:v 2.4M -acodec mp2 -ac 2 -b:a
> 128k -ar 44100 -af aresample=async=1:min_hard_comp=0.100:first_pts=0
> -metadata service_name="TVT" -mpegts_service_id 123 -f mpegts
> udp://224.0.0.247:5001?pkt_size=1316
>
>
> ffmpeg version 3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
>     built with gcc 4.7 (Debian 4.7.2-5)
>     configuration: --enable-gpl --enable-libx264 --enable-libmp3lame
> --enable-decklink --extra-cflags=-I/home/cor/DeckLink/Linux/include
> --extra-ldflags=-L/home/cor/DeckLink/Linux/include/
>     libavutil      55. 17.103 / 55. 17.103
>     libavcodec     57. 24.102 / 57. 24.102
>     libavformat    57. 25.100 / 57. 25.100
>     libavdevice    57.  0.101 / 57.  0.101
>     libavfilter     6. 31.100 /  6. 31.100
>     libswscale      4.  0.100 /  4.  0.100
>     libswresample   2.  0.101 /  2.  0.101
>     libpostproc    54.  0.100 / 54.  0.100
> [decklink @ 0x32d1780] Found Decklink mode 720 x 576 with rate 25.00(i)
> Guessed Channel Layout for  Input Stream #0.0 : stereo
> Input #0, decklink, from 'DeckLink SDI 4K at 2':
>     Duration: N/A, start: 0.000000, bitrate: 1536 kb/s
>       Stream #0:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
>       Stream #0:1: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x576,
> -4 kb/s, 25 tbr, 1000k tbn, 25 tbc
> Output #0, mpegts, to 'udp://224.0.0.247:5001?pkt_size=1316':
>     Metadata:
>       service_name    : TVT
>       encoder         : Lavf57.25.100
>       Stream #0:0: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45
> DAR 16:9], q=2-31, 3500 kb/s, 25 fps, 90k tbn, 25 tbc
>       Metadata:
>         encoder         : Lavc57.24.102 mpeg2video
>       Side data:
>         unknown side data type 10 (24 bytes)
>       Stream #0:1: Audio: mp2, 44100 Hz, stereo, s16, 128 kb/s
>       Metadata:
>         encoder         : Lavc57.24.102 mp2
> Stream mapping:
>     Stream #0:1 -> #0:0 (rawvideo (native) -> mpeg2video (native))
>     Stream #0:0 -> #0:1 (pcm_s16le (native) -> mp2 (native))
> Press [q] to stop, [?] for help
>
> Any though in what can be causing the descync and how to fix it?
>
> Thanks in advance.
>
> --Daniel B.
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