Unable to stream from Point Grey Flea3 camera using FFmpeg(4.0.2) DirectShow filter

[lhastie]

Camera resolution is 1200 x 720. Version of FFmpeg (4.0.2). Command line is as follows:

ffmpeg -f dshow -i video="Point Grey Camera" -vcodec flv -g 5 -q 10 -f flv c:\temp\test.flv

The following error is displayed :

[NULL @ 000002279a1534c0] [IMGUTILS @ 000000a89a7fe990] Picture size 1200x4294966576 is invalid

I raised a ticket directly with our camera supplier and they informed me that their DirectShow filter returns the image dimensions as 1200 x -720 indicating that the top row comes first in memory. Can you tell me if the current version of FFmpeg supports negative image height? We have older versions of FFmpeg that work perfectly well with the same camera set with the same resolution.

[Carl Eugen Hoyos]

Please test current FFmpeg git head, nothing else is supported here, and provide the command line you tested together with the complete, uncut console output to make this a valid ticket.

[Carl Eugen Hoyos]

And please tell us which commit introduced the regression you see.

[lhastie]

I tested with the latest version on your download page (ffmpeg-4.0.2.tar.bz2). Are you saying that I have to download the latest snapshot version?

[Carl Eugen Hoyos]

Definitely, there is no release support for Windows.

[lhastie]

Tested against the latest snapshot version. Please see output below :

ffmpeg -f dshow -i video="Point Grey Camera" -vcodec flv -g 5 -q 10 -f flv c:\temp\test.flv
ffmpeg version N-91930-g0caa33c60b Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 8.2.1 (GCC) 20180813
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --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
  libavutil      56. 19.101 / 56. 19.101
  libavcodec     58. 30.100 / 58. 30.100
  libavformat    58. 18.100 / 58. 18.100
  libavdevice    58.  4.103 / 58.  4.103
  libavfilter     7. 29.100 /  7. 29.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
[NULL @ 00000220861d34c0] [IMGUTILS @ 000000cd7e3feb90] Picture size 1200x4294966576 is invalid
[dshow @ 00000220861ca3c0] Could not find codec parameters for stream 0 (Video: rawvideo, bgr0): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, dshow, from 'video=Point Grey Camera':
  Duration: N/A, start: 3563175.687000, bitrate: N/A
    Stream #0:0: Video: rawvideo, bgr0, 25 fps, 25 tbr, 10000k tbn, 10000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> flv1 (flv))
Press [q] to stop, [?] for help
[rawvideo @ 00000220861d5340] width is not set
Error while decoding stream #0:0: Invalid data found when processing input
[rawvideo @ 00000220861d5340] width is not set

[lhastie]

After some investigation, it would seem that negative y resolution values have never been supported.

[Carl Eugen Hoyos]

Please test attached patch.

[lhastie]

Just tested the attached patch and it works perfectly.

Thanks

[Carl Eugen Hoyos]

Should be fixed in 1ba32a3c464a37beeb0943a630d5905d84d61b32, thank you for the report and the test!