[FFmpeg-user] PTS and DTS sync accross multiple output streams.

[Micael Silva]

On Mon, Mar 25, 2019 at 12:57 PM James E. Baird <James.Baird at ccr.net> wrote:

> Does anyone have any ideas on this? I am essentially trying to keep the
> timestamps with 3 output the same.
>
> Thoughts?
>
> James Baird
> Systems Administrator
> CCR
> p: (319) 734-3528
> m: (319) 775-7460
> w: www.ccr.net
>
>
>
>
> -----Original Message-----
> From: James E. Baird
> Sent: Monday, March 11, 2019 12:24 PM
> To: 'ffmpeg-user at ffmpeg.org' <ffmpeg-user at ffmpeg.org>
> Subject: PTS and DTS sync accross multiple output streams.
>
> Hello,
>
> I have a setup where I am transcoding live feeds from OTA broadcasts to
> H264 using the Nvidia NVENC encoder. I am also transcoding the audio to
> AAC. We are trying to output 3 cbr streams and various bitrates. The
> problem I am running into is that the PTS and DTS on the multiple outputs
> are not aligning which is critical for our use case. I am hoping there is
> an easy fix to this but I have not yet been able to locate one. Any
> thoughts on how to accomplish this?
>
> ===> Source Feed <===
> ffprobe udp://@238.224.1.5:59005
> ffprobe version N-93005-gd92f06e Copyright (c) 2007-2019 the FFmpeg
> developers
>   built with gcc 7 (Ubuntu 7.3.0-27ubuntu1~18.04)
>   configuration: --prefix=/home/circle/ffmpeg_build
> --pkg-config-flags=--static
> --extra-cflags=-I/home/circle/ffmpeg_build/include
> --extra-ldflags=-L/home/circle/ffmpeg_build/lib --extra-libs='-lpthread
> -lm' --bindir=/home/circle/bin --enable-gpl --enable-libaom --enable-libass
> --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame
> --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
> --enable-libx265 --enable-nonfree --enable-nvenc
>   libavutil      56. 26.100 / 56. 26.100
>   libavcodec     58. 44.100 / 58. 44.100
>   libavformat    58. 26.100 / 58. 26.100
>   libavdevice    58.  6.101 / 58.  6.101
>   libavfilter     7. 48.100 /  7. 48.100
>   libswscale      5.  4.100 /  5.  4.100
>   libswresample   3.  4.100 /  3.  4.100
>   libpostproc    55.  4.100 / 55.  4.100
> [mpeg2video @ 0x558e5a80fa40] Invalid frame dimensions 0x0.
>     Last message repeated 22 times
> Input #0, mpegts, from 'udp://@238.224.1.5:59005:
>   Duration: N/A, start: 89037.540778, bitrate: N/A
>   Program 3
>     Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
> yuv420p(tv, progressive), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions,
> 59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc
>     Stream #0:1[0x34](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000
> Hz, 5.1(side), fltp, 384 kb/s
>     Stream #0:2[0x35](spa): Audio: ac3 ([129][0][0][0] / 0x0081), 48000
> Hz, stereo, fltp, 192 kb/s
>
> ===> Command I am currently running to transcode <===
>
> screen -d -m ffmpeg -i 'udp://@
> 238.224.1.5:59005?fifo_size=1000000&overrun_nonfatal=1' \
>         -vcodec h264_nvenc -bf:v 2 -g 120 -rc cbr -b:v 6000K -profile:v
> high -level 4.0 -acodec aac -ac 2 -b:a 128k -ar 44100 -f mpegts -metadata
> service_name="test6000" -metadata service_provider="test" 'udp://@
> 239.1.1.1:59001?pkt_size=1316' \
>         -vcodec h264_nvenc -bf:v 2 -g 120 -rc cbr -b:v 3500K -profile:v
> high -level 4.0 -acodec aac -ac 2 -b:a 128k -ar 44100 -f mpegts -metadata
> service_name="test3500" -metadata service_provider="test" 'udp://@
> 239.1.1.2:59002?pkt_size=1316' \
>         -vcodec h264_nvenc -bf:v 2 -g 120 -rc cbr -b:v 1500K -profile:v
> high -level 4.0 -acodec aac -ac 2 -b:a 128k -ar 44100 -f mpegts -metadata
> service_name="test1500" -metadata service_provider="test" 'udp://@
> 239.1.1.3:59003?pkt_size=1316'
>
>
Did you tried -copyts on the output side?