title: Can't write packet with unknown timestamp av_interleaved_write_frame(): Invalid argument
body: <p>I'm trying to convert a .ts file with this output to mkv:</p>
  <pre><code>ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
    built with Apple clang version 12.0.0 (clang-1200.0.32.27)
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_4 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
    libavutil      56. 51.100 / 56. 51.100
    libavcodec     58. 91.100 / 58. 91.100
    libavformat    58. 45.100 / 58. 45.100
    libavdevice    58. 10.100 / 58. 10.100
    libavfilter     7. 85.100 /  7. 85.100
    libavresample   4.  0.  0 /  4.  0.  0
    libswscale      5.  7.100 /  5.  7.100
    libswresample   3.  7.100 /  3.  7.100
    libpostproc    55.  7.100 / 55.  7.100
  [mp3float @ 0x7fbd6282b200] Header missing
  [mpegts @ 0x7fbd62809000] PES packet size mismatch
  [mpegts @ 0x7fbd62809000] Packet corrupt (stream = 2, dts = 7125804577).
  [mpegts @ 0x7fbd62809000] PES packet size mismatch
  [mpegts @ 0x7fbd62809000] Packet corrupt (stream = 2, dts = 7125804577).
  [mpegts @ 0x7fbd62809000] PES packet size mismatch
  [mpegts @ 0x7fbd62809000] Packet corrupt (stream = 1, dts = 7125790091).
  Input #0, mpegts, from '/Users/&quot;User&quot;/Downloads/input.ts':
    Duration: 02:11:32.82, start: 71283.837456, bitrate: 17149 kb/s
    Program 1 
      Stream #0:0[0x1004]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuvj420p(pc, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 50 fps, 2.08 tbr, 90k tbn, 100 tbc
      Stream #0:1[0x1104](swe): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 256 kb/s
      Stream #0:2[0x704](swe): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 640 kb/s
  </code></pre>
  <p>To do that I'm using this command:</p>
  <pre><code>ffmpeg -i input.ts -c copy output.mkv
  </code></pre>
  <p>But the conversion fails with this error:</p>
  <pre><code>Stream mapping:
    Stream #0:0 -&gt; #0:0 (copy)
    Stream #0:2 -&gt; #0:1 (copy)
  Press [q] to stop, [?] for help
  [matroska @ 0x7fb8c1808200] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
  [matroska @ 0x7fb8c1808200] Can't write packet with unknown timestamp
  av_interleaved_write_frame(): Invalid argument
  [matroska @ 0x7fb8c1808200] Can't write packet with unknown timestamp
  Error writing trailer of output.mkv: Invalid argument
  frame=   27 fps=0.0 q=-1.0 Lsize=      74kB time=00:00:00.85 bitrate= 705.5kbits/s speed=  99x    
  video:1092kB audio:35kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  Conversion failed!
  </code></pre>
  <p>What should I do in order to fix this? I've already tried to add <code>-fflags +genpts</code> in the beginning but it fails anyway.</p>
  <p>EDIT: I did solve it by using MKVToolNix instead.</p>