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'
Let me know what other info may be needed.
Thanks in advance to any replies.
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