[FFmpeg-user] concat protocol - 3 objectives

[Mark Filipak]

On 02/24/2020 07:29 PM, Mark Filipak wrote:
> The concat protocol command at the end of this message works, but with 
> limits. Since the concat protocol basically works, it seems logical to 
> me to simply expand its capability. To that end, I now have 3 objectives.
> 
> Objective 1: Expand it to include all 4 audio streams, not just the 
> first 5.1 channel stream encountered (which happens to be the isolated 
> score).

Done.

> Objective 2: Output it as an MKV, not as a TS. >
> Objective 3: Include subtitles.
> 
> Regarding Objective 2: Simply specifying 'n:\output.mkv' fails
> 
>      [matroska @ 0000016de19500c0] Can't write packet with unknown 
> timestamp
>      av_interleaved_write_frame(): Invalid argument
>      frame=    2 fps=0.0 q=-1.0 Lsize=      10kB time=00:00:00.00 
> bitrate=83856.0kbits/s speed=0.0594x
>      video:8kB audio:2kB subtitle:0kB other streams:0kB global 
> headers:0kB muxing overhead: 6.697883%
>      Conversion failed!
> 
> Regarding Objective 3: Though a subtitle stream is not reported, the 5 
> concatenated sources do have subtitles. However, I think I have to get a 
> matroska container working before attempting to include the subtitles, 
> so this objective will have to wait.
> 
> Note that from ffprobe, I can see that the video & audio stream numbers 
> change from one VOB to another. But ffmpeg apparently can track them 
> automatically -- I write that with confidence because, when I play 
> 'output.ts', the single audio stream that gets into 'output.ts' (i.e., 
> the isolated score) is constant and doesn't suddenly become dialog in 
> the middle.
> 
> Can anyone suggest how I can meet any of my objectives?
> 
> Warm Regards,
> Mark.
> 
> 
>  >ffmpeg -i 
> "concat:i:\VIDEO_TS\VTS_02_1.VOB|i:\VIDEO_TS\VTS_02_2.VOB|i:\VIDEO_TS\VTS_02_3.VOB|i:\VIDEO_TS\VTS_02_4.VOB|i:\VIDEO_TS\VTS_02_5.VOB" 
> -c copy n:\output.ts
> ffmpeg version N-94664-g0821bc4eee Copyright (c) 2000-2019 the FFmpeg 
> developers
>    built with gcc 9.1.1 (GCC) 20190807
>    configuration: --enable-gpl --enable-version3 --enable-sdl2 
> --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass 
> --enable-libdav1d --enable-libbluray --enable-libfreetype 
> --enable-libmp3lame --enable-libopencore-amrnb 
> --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus 
> --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora 
> --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp 
> --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg 
> --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab 
> --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa 
> --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx 
> --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va 
> --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth 
> --enable-libopenmpt
>    libavutil      56. 33.100 / 56. 33.100
>    libavcodec     58. 55.101 / 58. 55.101
>    libavformat    58. 31.104 / 58. 31.104
>    libavdevice    58.  9.100 / 58.  9.100
>    libavfilter     7. 58.101 /  7. 58.101
>    libswscale      5.  6.100 /  5.  6.100
>    libswresample   3.  6.100 /  3.  6.100
>    libpostproc    55.  6.100 / 55.  6.100
> Input #0, mpeg, from 
> 'concat:i:\VIDEO_TS\VTS_02_1.VOB|i:\VIDEO_TS\VTS_02_2.VOB|i:\VIDEO_TS\VTS_02_3.VOB|i:\VIDEO_TS\VTS_02_4.VOB|i:\VIDEO_TS\VTS_02_5.VOB': 
> 
>    Duration: 01:43:54.21, start: 0.041500, bitrate: 6105 kb/s
>      Stream #0:0[0x1bf]: Data: dvd_nav_packet
>      Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, top 
> first), 720x480 [SAR 32:27 DAR 16:9], Closed Captions, 29.97 fps, 29.97 
> tbr, 90k tbn, 59.94 tbc
>      Stream #0:2[0x83]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
>      Stream #0:3[0x82]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
>      Stream #0:4[0x81]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
>      Stream #0:5[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
> Output #0, mpegts, to 'n:\output.ts':
>    Metadata:
>      encoder         : Lavf58.31.104
>      Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, top first), 
> 720x480 [SAR 32:27 DAR 16:9], q=2-31, 29.97 fps, 29.97 tbr, 90k tbn, 90k 
> tbc
>      Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
> Stream mapping:
>    Stream #0:1 -> #0:0 (copy)
>    Stream #0:2 -> #0:1 (copy)
> Press [q] to stop, [?] for help
> [mpegts @ 0000023c737c00c0] 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
> [mpeg @ 0000023c731a9000] New subtitle stream 0:6 at pos:116221966 and 
> DTS:120.328speed=12.9x
> frame=159684 fps=2310 q=-1.0 Lsize= 4048589kB time=01:43:54.17 
> bitrate=5320.0kbits/s speed=90.2x
> video:3573203kB audio:340933kB subtitle:0kB other streams:0kB global 
> headers:0kB muxing overhead: 3.435060%