[FFmpeg-user] Timestamps are unset in a packet for stream 1. UDP Streaming

[Mar Andrés López]

Dear all,

My video which has KLV metadata on stream 1, is not timestamped properly, when streaming udp. ¿Is there anyway to recreate the timestamps? I am doing something wrong when streaming by udp.

The command employed is the following:

>>ffmpeg -re -i klv.mpeg -map 0 -codec copy -f mpegts udp://127.0.0.1:9000?pkt_size=1316

ffmpeg version N-101612-gda12d600ea Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 9.3-win32 (GCC) 20200320
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-shared --disable-static --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-opencl --enable-libvmaf --enable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm --enable-libglslang --enable-libgme --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
  libavutil      56. 68.100 / 56. 68.100
  libavcodec     58.133.100 / 58.133.100
  libavformat    58. 74.100 / 58. 74.100
  libavdevice    58. 12.100 / 58. 12.100
  libavfilter     7.109.100 /  7.109.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
[mpegts @ 000002c852e57000] start time for stream 1 is not set in estimate_timings_from_pts
Input #0, mpegts, from 'klv.mpeg':
  Duration: 00:01:30.80, start: 0.500000, bitrate: 1347 kb/s
  Program 1
  Stream #0:0[0x3e8]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, bt470bg, progressive), 640x480 [SAR 1:1 DAR 4:3], 30 fps, 30 tbr, 90k tbn, 60 tbc
    Side data:
      cpb: bitrate max/min/avg: 1000000/0/0 buffer size: 1835008 vbv_delay: N/A
  Stream #0:1[0x90]: Data: klv (KLVA / 0x41564C4B)
Output #0, mpegts, to 'udp://127.0.0.1:9000?pkt_size=1316':
  Metadata:
    encoder         : Lavf58.74.100
  Stream #0:0: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, bt470bg, progressive), 640x480 [SAR 1:1 DAR 4:3], q=2-31, 30 fps, 30 tbr, 90k tbn, 90k tbc
    Side data:
      cpb: bitrate max/min/avg: 1000000/0/0 buffer size: 1835008 vbv_delay: N/A
  Stream #0:1: Data: klv (KLVA / 0x41564C4B)
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mpegts @ 000002c854add100] Timestamps are unset in a packet for stream 1. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
frame=   31 fps= 30 q=-1.0 size=      66kB time=00:00:01.03 bitrate= 524.0kbits/s speed=   1x


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