Hi,
On Win7 x64, Capturing SDI from DeckLink Duo 2.
When encoding with FFmpeg, audio seems to be about 100ms later than
video. Is there a known solution to this, or is there a way to delay
video by roughly 100ms?
Below is the command & output when using NVENC and streaming UDP, but
delayed audio is present also when using libx264 or outputting to FLV file.
Also there is no such sync issues when capturing the same SDI input
using Blackmagic Media Express.
---------------------------------------------------
ffmpeg -f decklink -i "DeckLink Duo (3)@9" -vcodec nvenc -b:v 2M
-pix_fmt yuv420p -acodec aac -b:a 128k -bsf:v h264_mp4toannexb -f mpegts
udp://127.0.0.1:30003?pkt_size=1316
ffmpeg version N-79037-g370cecc Copyright (c) 2000-2016 the FFmpeg
developers
built with gcc 5.3.0 (GCC)
configuration: --arch=x86_64 --target-os=mingw32
--cross-prefix=/home/david/opt/ffmpeg-cross-compile/sandbox/cross_compilers/mingw-w64-x86_64/bin/x86_64-w64-mingw32-
--pkg-config=pkg-config --disable-w32threads --enable-gpl
--enable-libsoxr --enable-fontconfig --enable-libass --enable-libutvideo
--enable-libbluray --enable-iconv --enable-libtwolame
--extra-cflags=-DLIBTWOLAME_STATIC --enable-libzvbi --enable-libcaca
--enable-libmodplug --extra-libs=-lstdc++ --extra-libs=-lpng
--enable-libvidstab --enable-libx265 --enable-decklink
--extra-libs=-loleaut32 --enable-libx264 --enable-libxvid
--enable-libmp3lame --enable-version3 --enable-zlib --enable-librtmp
--enable-libvorbis --enable-libtheora --enable-libspeex
--enable-libopenjpeg --enable-gnutls --enable-libgsm
--enable-libfreetype --enable-libopus --enable-frei0r
--enable-filter=frei0r --enable-bzlib --enable-libxavs
--enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libvo-amrwbenc --enable-libschroedinger --enable-libvpx
--enable-libilbc --enable-libwavpack --enable-libwebp --enable-libgme
--enable-dxva2 --enable-libdcadec --enable-avisynth --enable-gray
--enable-libopenh264 --extra-libs=-lpsapi --extra-cflags=
--enable-static --disable-shared
--prefix=/home/david/opt/ffmpeg-cross-compile/sandbox/cross_compilers/mingw-w64-x86_64/x86_64-w64-mingw32
--enable-nonfree --enable-libfdk-aac --disable-libfaac --enable-nvenc
--enable-runtime-cpudetect
libavutil 55. 19.100 / 55. 19.100
libavcodec 57. 28.103 / 57. 28.103
libavformat 57. 28.101 / 57. 28.101
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 39.102 / 6. 39.102
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
[decklink @ 0000000000603420] Found Decklink mode 1920 x 1080 with rate
29.97(i)
[decklink @ 0000000000603420] Frame received (#1) - No input signal
detected - Frames dropped 1
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, decklink, from 'DeckLink Duo (3)@9':
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,
1920x1080, -5 kb/s, 29.97 tbr, 1000k tbn, 29.97 tbc
Output #0, mpegts, to 'udp://127.0.0.1:30003?pkt_size=1316':
Metadata:
encoder : Lavf57.28.101
Stream #0:0: Video: h264 (nvenc) (Main), yuv420p, 1920x1080,
q=-1--1, 2000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
Metadata:
encoder : Lavc57.28.103 nvenc
Side data:
cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000
vbv_delay: -1
Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc57.28.103 aac
Stream mapping:
Stream #0:1 -> #0:0 (rawvideo (native) -> h264 (nvenc))
Stream #0:0 -> #0:1 (pcm_s16le (native) -> aac (native))
--
David Shimamoto
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