[FFmpeg-user] 'print:file=foo.txt' fails

[Paul B Mahol]

On 2/6/20, Mark Filipak <markfilipak.windows+ffmpeg at gmail.com> wrote:
> The command line below creates 'foo.txt' but the file is empty (i.e.,
> zero length).
>
> Any clues why?

Because your file does not have any _frame_ metadata.


>
> Thanks,
> Mark
>
>
> C:\CMD & tiny apps\ffmpeg>ffmpeg -i G:\VIDEO_TS\VTS_02_2.VOB -vf
> metadata=mode=print:file=foo.txt -f rawvideo -y NUL
>
> 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
> [mpeg2video @ 000001b88fa7a240] Invalid frame dimensions 0x0.
>      Last message repeated 2 times
> Input #0, mpeg, from 'G:\VIDEO_TS\VTS_02_2.VOB':
>    Duration: 00:24:02.08, start: 1159.049500, bitrate: 5956 kb/s
>      Stream #0:0[0x81]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
>      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[0x82]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
>      Stream #0:3[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
>      Stream #0:4[0x83]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
>      Stream #0:5[0x1bf]: Data: dvd_nav_packet
> Stream mapping:
>    Stream #0:1 -> #0:0 (mpeg2video (native) -> rawvideo (native))
> Press [q] to stop, [?] for help
> Output #0, rawvideo, to 'NUL':
>    Metadata:
>      encoder         : Lavf58.31.104
>      Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 720x480
> [SAR 32:27 DAR 16:9], q=2-31, 124291 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc
>      Metadata:
>        encoder         : Lavc58.55.101 rawvideo
> [mpeg @ 000001b88fa79000] New subtitle stream 0:6 at pos:5988366 and
> DTS:1166.24s
> More than 1000 frames duplicated= 9974528kB time=00:10:57.42
> bitrate=124290.3kbits/s dup=884 drop=0 speed=62.5x
> [mpeg2video @ 000001b88fad6c00] ac-tex damaged at 12 1640.35
> bitrate=124290.4kbits/s dup=5326 drop=0 speed=69.2x
> [mpeg2video @ 000001b88fad6c00] Warning MVs not available
> [mpeg2video @ 000001b88fad6c00] concealing 630 DC, 630 AC, 630 MV errors
> in B frame
> G:\VIDEO_TS\VTS_02_2.VOB: corrupt decoded frame in stream 1
> frame=43213 fps=2080 q=-0.0 Lsize=21876581kB time=00:24:01.87
> bitrate=124291.7kbits/s dup=5455 drop=0 speed=69.4x
> video:21876581kB audio:0kB subtitle:0kB other streams:0kB global
> headers:0kB muxing overhead: 0.000000%
>
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