FFmpeg with Tesla P100 - How to properly full hardware transcode with deinterlace from 25i to 50p

Hi,

I’m trying to do a full hardware transcode of an udp stream to hls with deinterlace 25i to 50p.

Since HLS requires deinterlacing
https://developer.apple.com/library/content/documentation/General/Reference/HLSAuthoringSpec/Requirements.html
I would like to deinterlace an interlaced source stream and preserve as much smooth motion and picture quality as possible.

My hardware, software and driver info:

GPU: Tesla P100-PCIE-12GB
Nvidia Driver Version: 387.26
Cuda compilation tools, release 9.1, V9.1.85

FFmpeg from git on 20171218
ffmpeg version N-89520-g3f88744067 Copyright © 2000-2017 the FFmpeg developers
built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
configuration: --enable-gpl --enable-cuda-sdk --enable-libx264 --enable-libx265 --enable-nonfree --enable-libnpp --enable-opengl --enable-opencl --enable-libfreetype --enable-openssl --enable-libzvbi --enable-libfontconfig --enable-libfreetype --enable-libfribidi --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 --arch=x86_64
libavutil 56. 6.100 / 56. 6.100
libavcodec 58. 8.100 / 58. 8.100
libavformat 58. 3.100 / 58. 3.100
libavdevice 58. 0.100 / 58. 0.100
libavfilter 7. 7.100 / 7. 7.100
libswscale 5. 0.101 / 5. 0.101
libswresample 3. 0.101 / 3. 0.101
libpostproc 55. 0.100 / 55. 0.100

Input stream info:

ffmpeg -t 00:05:00 -i udp://xxx.xxx.xxx.xxx:xxxx -map 0:0 -vf idet -c rawvideo -y -f rawvideo /dev/null


Input #0, mpegts, from ‘udp://xxx.xxx.xxx.xxx:xxxx’:
Duration: N/A, start: 49634.159411, bitrate: N/A
Program xxxxx
Metadata:
service_name :
service_provider:
Stream #0:0[0x44d]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
Stream #0:10x19de: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 192 kb/s
Stream #0:20x19e1: Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)

Output #0, rawvideo, to ‘/dev/null’:
Metadata:
encoder : Lavf58.3.100
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 622080 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.8.100 rawvideo
frame= 7538 fps= 25 q=-0.0 Lsize=22896675kB time=00:05:01.52 bitrate=622080.0kbits/s dup=38 drop=0 speed=1.02x
video:22896675kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
[Parsed_idet_0 @ 0x56370b3c5080] Repeated Fields: Neither: 7458 Top: 24 Bottom: 18
[Parsed_idet_0 @ 0x56370b3c5080] Single frame detection: TFF: 281 BFF: 13 Progressive: 5639 Undetermined: 1567
[Parsed_idet_0 @ 0x56370b3c5080] Multi frame detection: TFF: 380 BFF: 0 Progressive: 7120 Undetermined: 0


This is my command - it gives great results with picture, but sound is out of sync.

ffmpeg -y -err_detect ignore_err -loglevel debug -vsync -1 -hwaccel cuvid -hwaccel_device 1 -c:v h264_cuvid -deint adaptive -r:v 50 -gpu:v 1 -i “udp://xxx.xxx.xxx.xxx:xxxx=?overrun_nonfatal=1&fifo_size=84450&buffer_size=33554432” -map 0:0 -map 0:1 -c:a aac -b:a 196k -c:v h264_nvenc -flags -global_header+cgop -gpu:v 1 -g:v 50 -bf:v 4 -coder:v cabac -b_adapt:v false -b:v 5184000 -minrate:v 5184000 -maxrate:v 5184000 -bufsize:v 2488320 -rc:v cbr_hq -2pass:v true -rc-lookahead:v 25 -no-scenecut:v 1 -profile:v high -preset:v slow -color_range:v 1 -color_trc:v 1 -color_primaries:v 1 -colorspace:v 1 -f hls -hls_time 5 -hls_list_size 3 -start_number 0 -hls_flags delete_segments /srv/hls/program_01/1080p/index.m3u8

Can somebody please point me in the right direction? What am I doing wrong?