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Well I do not understand either but try with smplayer and you will see strange thing happen (slow motion; out of sync, bad timestand displayed, ...). Each .ts works fine in mplayer, not the result of the cat command.
Note that its VC1 + eac3 (HDTV in france).
Note the error below when trying to convert the "cat merged ts files" into a mkv
[matroska @ 0x66ace0]st:2 error, non monotone timestamps 147691 >= 147691ts/s
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valette@tri-yann3:~$ ffmpeg -i /multimedia/Video/foo.ts -vcodec copy -sameq -acodec copy -sameq -scodec copy -f matroska /multimedia/Video/foo.mkv FFmpeg version UNKNOWN, Copyright (c) 2000-2010 the FFmpeg developers
built on Mar 21 2010 12:00:07 with gcc 4.4.3
configuration: --enable-libdc1394 --prefix=/usr --extra-cflags='-Wall -g ' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-libfaad --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libtheora --enable-libspeex --enable-nonfree --disable-stripping --enable-avfilter --enable-libdirac --disable-decoder=libdirac --enable-libschroedinger --disable-encoder=libschroedinger --enable-avfilter-lavf --enable-libopenjpeg --enable-version3 --disable-altivec --disable-armv5te --disable-armv6 --disable-vis libavutil 50.12. 0 / 50.12. 0 libavcodec 52.59. 0 / 52.59. 0 libavformat 52.56. 1 / 52.56. 1 libavdevice 52. 2. 0 / 52. 2. 0 libavfilter 1.18. 0 / 1.18. 0 libswscale 0.10. 0 / 0.10. 0 libpostproc 51. 2. 0 / 51. 2. 0 [h264 @ 0x667dc0]number of reference frames exceeds max (probably corrupt input), discarding one Last message repeated 39 times [h264 @ 0x667dc0]mmco: unref short failure Last message repeated 1 times [mpegts @ 0x64b5f0]max_analyze_duration reached Input #0, mpegts, from '/multimedia/Video/foo.ts': Duration: 02:39:54.00, start: 93129.649278, bitrate: 7907 kb/s Program 132 Stream #0.0[0x2d0]: Video: h264, yuv420p, 1440x1080 [PAR 4:3 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 50 tbc Stream #0.1[0x2da](fra): Audio: mp2, 48000 Hz, 2 channels, s16, 256 kb/s Stream #0.2[0x2db](deu): Audio: mp2, 48000 Hz, 2 channels, s16, 256 kb/s Stream #0.3[0x2e4](fra): Subtitle: dvbsub Stream #0.4[0x2e5](deu): Subtitle: dvbsub Stream #0.5[0x2e6](fra): Subtitle: dvbsub [matroska @ 0x66ace0]Codec for stream 2 does not use global headers but container format requires global headers Output #0, matroska, to '/multimedia/Video/foo.mkv': Metadata: encoder : Lavf52.56.1 Stream #0.0: Video: libx264, yuv420p, 1440x1080 [PAR 4:3 DAR 16:9], q=2-31, 1k tbn, 25 tbc Stream #0.1(fra): Audio: mp2, 48000 Hz, 2 channels, 256 kb/s Stream #0.2(fra): Subtitle: dvbsub Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Stream #0.3 -> #0.2 Press [q] to stop encoding [matroska @ 0x66ace0]st:2 error, non monotone timestamps 147691 >= 147691ts/s Last message repeated 427 times33841kB time=147.69 bitrate=7423.8kbits/s [mpegts @ 0x64b5f0]Invalid timestamps stream=0, pts=1050, dts=8589914042, size=22580 [mpegts @ 0x64b5f0]Invalid timestamps stream=0, pts=13650, dts=8589926642, size=43564 [mpegts @ 0x64b5f0]Invalid timestamps stream=0, pts=15450, dts=8589928442, size=23132 [mpegts @ 0x64b5f0]Invalid timestamps stream=0, pts=6450, dts=8589930242, size=30860 [mpegts @ 0x64b5f0]Invalid timestamps stream=0, pts=8250, dts=8589932042, size=20924 [mpegts @ 0x64b5f0]Invalid timestamps stream=0, pts=2850, dts=8589933842, size=5468 [matroska @ 0x66ace0]st:2 error, non monotone timestamps 147691 >= 147691s/s Processus arrêté=212 q=-1.0 size= 133850kB time=147.69 bitrate=7424.3kbits/s