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  • Can't synchronize frame from two webcam streams side by side using ffmpeg

    15 juin 2019, par Peppe

    i’m trying to stream two webcam in sbs mode using ffmpeg websocket.

    It works but there is a delay of some second between the two scene.

    Here is what I do :

    ffmpeg -f v4l2   -framerate 30 -video_size 1280x720 -input_format mjpeg 
    
-i /dev/video1 -f v4l2 -framerate 30  -input_format mjpeg 
    
-video_size 1280x720 -i /dev/video0 -filter_complex "
    
[0:v][1:v]hstack [left+right]" -map [left+right] -r 30 -fflags nobuffer 
    
-f mpegts -codec:v mpeg1video -s 2560x720 -b:v 800k -bf 0 http://localhost:8081/secretsecret

    And this is the output :

    ffmpeg version 4.1.3-0ubuntu1 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with gcc 8 (Ubuntu 8.3.0-6ubuntu1)
    
  configuration: --prefix=/usr --extra-version=0ubuntu1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable- libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
    
  libavutil      56. 22.100 / 56. 22.100
    
  libavcodec     58. 35.100 / 58. 35.100
    
  libavformat    58. 20.100 / 58. 20.100
    
  libavdevice    58.  5.100 / 58.  5.100
    
  libavfilter     7. 40.101 /  7. 40.101
    
  libavresample   4.  0.  0 /  4.  0.  0
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100
    
Input #0, video4linux2,v4l2, from '/dev/video2':
    
    Duration: N/A, start: 9539.835119, bitrate: N/A
    
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 25 fps, 25 tbr, 1000k tbn, 1000k tbc
    
Input #1, video4linux2,v4l2, from '/dev/video4':
    
  Duration: N/A, start: 9541.474622, bitrate: N/A
    
    Stream #1:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 25 fps, 25 tbr, 1000k tbn, 1000k tbc
    
Stream mapping:
    
  Stream #0:0 (mjpeg) -> hstack:input0
    
  Stream #1:0 (mjpeg) -> hstack:input1
    
  hstack -> Stream #0:0 (mpeg1video)
    
Press [q] to stop, [?] for help
    
[swscaler @ 0x55aa2c266f00] deprecated pixel format used, make sure you did set range correctly
    
Output #0, mpegts, to 'http://localhost:8081/supersecret':
    
  Metadata:
    
encoder         : Lavf58.20.100
    
Stream #0:0: Video: mpeg1video, yuv420p, 2560x720, q=2-31, 800 kb/s, 25 fps, 90k tbn, 25 tbc (default)
    
Metadata:
    
  encoder         : Lavc58.35.100 mpeg1video
    
Side data:
    
  cpb: bitrate max/min/avg: 0/0/800000 buffer size: 0 vbv_delay: -1
    
[video4linux2,v4l2 @ 0x55aa2c1d4e40] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)

    It works but there is a delay of 1 second between the two screens.

    also tried with :

    ffmpeg -f v4l2 -framerate 25 -video_size 1280x720 -input_format mjpeg -i \
    
/dev/video2 -f v4l2 -framerate 25  -input_format mjpeg -video_size 1280x720 \
    
-i /dev/video4 -filter_complex " \
    
nullsrc=size=2560x720 [background]; \
    
[0:v] setpts=PTS-STARTPTS, scale=1280x720 [left]; \
    
[1:v] setpts=PTS-STARTPTS, scale=1280x720 [right]; \
    
[background][left]       overlay=shortest=1       [background+left]; \
    
[background+left][right] overlay=shortest=1:x=1280 [left+right] \
    
" -map [left+right] -f mpegts -codec:v mpeg1video -s 2560x720 -b:v 800k -bf 0     http://localhost:8081/supersecret

    but same problem....
    How can I fix ?

  • tools/python : add script to convert TensorFlow model (.pb) to native model (.model)

    13 juin 2019, par Guo, Yejun
    tools/python : add script to convert TensorFlow model (.pb) to native model (.model)

    For example, given TensorFlow model file espcn.pb,
    
to generate native model file espcn.model, just run :
    
python convert.py espcn.pb
    

    In current implementation, the native model file is generated for
    
specific dnn network with hard-code python scripts maintained out of ffmpeg.
    
For example, srcnn network used by vf_sr is generated with
    
https://github.com/HighVoltageRocknRoll/sr/blob/master/generate_header_and_model.py#L85
    

    In this patch, the script is designed as a general solution which
    
converts general TensorFlow model .pb file into .model file. The script
    
now has some tricky to be compatible with current implemention, will
    
be refined step by step.
    

    The script is also added into ffmpeg source tree. It is expected there
    
will be many more patches and community needs the ownership of it.
    

    Another technical direction is to do the conversion in c/c++ code within
    
ffmpeg source tree. While .pb file is organized with protocol buffers,
    
it is not easy to do such work with tiny c/c++ code, see more discussion
    
at http://ffmpeg.org/pipermail/ffmpeg-devel/2019-May/244496.html. So,
    
choose the python script.
    

    Signed-off-by : Guo, Yejun <yejun.guo@intel.com>
    • [DH] .gitignore
    • [DH] tools/python/convert.py
    • [DH] tools/python/convert_from_tensorflow.py

  • Trying to use ffmpeg to create slideshow from ISO-8601 named pictures. Getting output with no playable streams

    19 juin 2019, par Robert Ellegate

    I’m trying to create a slideshow of images that are irregular in dimension/orientation but all named with the same ISO-8601 date format.

    I’ve normalized the filenames so they are all YYYYMMDD.jpg. I have tried using the globular pattern type for ffmpeg and various methods for inputting the files, including piping the concatenation of the files into ffmpeg.

    Here are the images I’m trying to use :

    $ ls *.jpg | xargs -n1 file
    
20190411.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=upper-left, width=0], baseline, precision 8, 10128x3984, components 3
    
20190417.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=lower-right, width=0], baseline, precision 8, 10176x3952, components 3
    
20190424.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=upper-left, width=0], baseline, precision 8, 12128x3840, components 3
    
20190429.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=upper-left, width=0], baseline, precision 8, 11104x3888, components 3
    
20190430.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=lower-right, width=0], baseline, precision 8, 10992x3920, components 3
    
20190501.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=lower-right, width=0], baseline, precision 8, 10528x3936, components 3
    
20190502.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=lower-right, width=0], baseline, precision 8, 10992x3792, components 3
    
20190508.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=lower-right, width=0], baseline, precision 8, 11008x3808, components 3
    
20190515.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=lower-right, width=0], baseline, precision 8, 10416x3760, components 3
    
20190516.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=lower-right, width=0], baseline, precision 8, 10928x3760, components 3
    
20190517.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=lower-right, width=0], baseline, precision 8, 10720x3840, components 3
    
20190522.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 6552x1688, components 3
    
20190523.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 6572x1700, components 3
    
20190524.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 6468x1659, components 3
    
20190528.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 5424x1644, components 3
    
20190529.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=7, model=Pixel 2 XL, height=0, manufacturer=Google, orientation=[*0*], datetime=2019:05:29 16:38:01, width=0]
    
20190531.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 6584x1693, components 3
    
20190603.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 6536x1690, components 3
    
20190604.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 5748x1618, components 3
    
20190606.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 6196x1690, components 3
    
20190607.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 6112x1674, components 3
    
20190610.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 6440x1670, components 3
    
20190611.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 6312x1694, components 3
    
20190612.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=4, height=0, orientation=[*0*], width=0], baseline, precision 8, 6176x1689, components 3

    And these are the various ffmpeg commands I’ve tried using :

    cat *.jpg | ffmpeg -framerate 1/5 -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4
    cat *.jpg | ffmpeg -f image2pipe -i - output.mkv
    ffmpeg -framerate 1/5 -pattern_type glob -i '*.jpg' out.mp4
    ffmpeg -framerate 1/5 -pattern_type glob -i '*.jpg' -c:v libx264 -vf fps=25 -pix_fmt yuv420p out.mp4

    I’m trying to create a video that shows each image for 5 seconds in order, but I’m getting a mp4 video file with no playable streams.

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