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• Basic "pass-through" use of FFmpegReader/FFmpegWriter in scikit-video

  6 février 2021, par JonathanZ supports MonicaC

  I am starting to use scikit-video and am having trouble writing files. I have reduced the problem to the simplest possible example

  


  vid_file = "6710185719062326259_stamp_25pct.mp4"
output_file = "out_temp3.mp4"
reader = skvideo.io.FFmpegReader(vid_file)
writer = skvideo.io.FFmpegWriter(output_file)
for frame in reader.nextFrame():
        writer.writeFrame(frame)
writer.close()


  


  I'm playing the files in VLC, and the vid_file is valid but the output file, though playable, is mostly big green blocks (though I can discern some details from the original video in it).

  


  My goal, or course, is to do "interesting" manipulations of the frame before I write it out, but I need to get the "no modifications" version working correctly first. I'm also going to be using this on large files, so the vread/vwrite functions that process an entire file at once are not appropriate.

  


  I'm guessing I need to set the appropriate values in the outputdict parameter for the FFmpegWriter, but there are so many that I don't know where to start. I have tried

  


  writer = skvideo.io.FFmpegWriter(output_file, outputdict={'-crf': '0', '-pix_fmt': 'rgb24'})


  


  (-crf 0 to suppress any compression, -pixfmt rgb24 as that's what FFmpegReader says it delivers by default, but these don't work either.

  


  Any ideas on how to make this work ?

  


  Here's the skvideo.io.ffprobe video information for the input file.

  


  {
    "@index": "0",
    "@codec_name": "h264",
    "@codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
    "@profile": "High",
    "@codec_type": "video",
    "@codec_time_base": "1/30",
    "@codec_tag_string": "avc1",
    "@codec_tag": "0x31637661",
    "@width": "480",
    "@height": "270",
    "@coded_width": "480",
    "@coded_height": "272",
    "@has_b_frames": "2",
    "@pix_fmt": "yuv420p",
    "@level": "21",
    "@chroma_location": "left",
    "@refs": "1",
    "@is_avc": "true",
    "@nal_length_size": "4",
    "@r_frame_rate": "15/1",
    "@avg_frame_rate": "15/1",
    "@time_base": "1/15360",
    "@start_pts": "0",
    "@start_time": "0.000000",
    "@duration_ts": "122880",
    "@duration": "8.000000",
    "@bit_rate": "183806",
    "@bits_per_raw_sample": "8",
    "@nb_frames": "120",
    "disposition": {
        "@default": "1",
        "@dub": "0",
        "@original": "0",
        "@comment": "0",
        "@lyrics": "0",
        "@karaoke": "0",
        "@forced": "0",
        "@hearing_impaired": "0",
        "@visual_impaired": "0",
        "@clean_effects": "0",
        "@attached_pic": "0",
        "@timed_thumbnails": "0"
    },
    "tag": [
        {
            "@key": "language",
            "@value": "und"
        },
        {
            "@key": "handler_name",
            "@value": "VideoHandler"
        }
    ]
}


  


  I will mention that when I ffprobe the output file the only differences I see are 1) the timing data is different, which isn't surprising, and 2) the output file has

  


      "@has_b_frames": "0",
    "@pix_fmt": "yuv444p",


  


  I'm pretty confident the reader is working okay, because if I write out the data with

  


  skimage.io.imsave('x.png', frame,  check_contrast=False)


  


  it looks good.

  


• FFMPEG, macOS Catalina : "ffmpeg stderr : /private/tmp/com.apple.launchd.ID/org.macosforge.xquartz:0 : Operation not supported on socket"

  11 février 2021, par Bogdan Slyusarenko

  I'm trying to record selenium test run with FFMPEG, for automation testing of web extensions (selenium+js/ts).
FFMPEG initiated by command :

  


      const { spawn } = require("child_process");
        ffmpeg = spawn("ffmpeg", [
          "-x265-params",
          "-f",
          "xcbgrab", 
          "-video_size",
          "1280x1024", 
          "-i",
          process.env.DISPLAY, // "/private/tmp/com.apple.launchd.ID/org.macosforge.xquartz:0"
          "-loglevel",
          "debug", 
          "-y", 
          "-pix_fmt",
          "yuv420p",
          videoPath, 
        ]);


  


  Return constantly error,related to process.DISPLAY, I'm not sure why it's so :

  


      ffmpeg stderr: /private/tmp/com.apple.launchd.W851FkeNXz/org.macosforge.xquartz:0: Operation not supported on socket


  


  Full debug login is :

  


  ffmpeg stderr: ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
ffmpeg stderr:   built with Apple clang version 12.0.0 (clang-1200.0.32.28)
ffmpeg stderr:   configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_9 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
ffmpeg stderr: libavutil      56. 51.100 / 56. 51.100
ffmpeg stderr:   libavcodec     58. 91.100 / 58. 91.100
ffmpeg stderr:   libavformat    58. 45.100 / 58. 45.100
ffmpeg stderr:   libavdevice    58. 10.100 / 58. 10.100
ffmpeg stderr:   libavfilter     7. 85.100 /  7. 85.100
ffmpeg stderr:   libavresample   4.  0.  0 /  4.  0.  0
ffmpeg stderr:   libswscale      5.  7.100 /  5.  7.100
ffmpeg stderr:   libswresample   3.  7.100 /  3.  7.100
ffmpeg stderr:   libpostproc    55.  7.100 / 55.  7.100
ffmpeg stderr: Splitting the commandline.
ffmpeg stderr: Reading option '-x265-params' ...
ffmpeg stderr: matched as AVOption 'x265-params' with argument '-f'.
ffmpeg stderr: Reading option 'xcbgrab' ...
ffmpeg stderr: matched as output url.
ffmpeg stderr: Reading option '-video_size' ...
ffmpeg stderr: matched as AVOption 'video_size' with argument '1280x1024'.
ffmpeg stderr: Reading option '-i' ... matched as input url with argument '/private/tmp/com.apple.launchd.W851FkeNXz/org.macosforge.xquartz:0'.
ffmpeg stderr: Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
ffmpeg stderr: Reading option '-y' ...
ffmpeg stderr: matched as option 'y' (overwrite output files) with argument '1'.
ffmpeg stderr: Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv420p'.
ffmpeg stderr: Reading option '/Volumes/MacHD2/Upprojects/TEST/log/Checkout-Google.com-Search-on-Google.mp4' ... matched as output url.
ffmpeg stderr: Finished splitting the commandline.
ffmpeg stderr: Parsing a group of options: global .
ffmpeg stderr: Applying option loglevel (set logging level) with argument debug.
ffmpeg stderr: Applying option y (overwrite output files) with argument 1.
ffmpeg stderr: Successfully parsed a group of options.
ffmpeg stderr: Parsing a group of options: input url /private/tmp/com.apple.launchd.W851FkeNXz/org.macosforge.xquartz:0.
ffmpeg stderr: Successfully parsed a group of options.
ffmpeg stderr: Opening an input file: /private/tmp/com.apple.launchd.W851FkeNXz/org.macosforge.xquartz:0.
ffmpeg stderr: [NULL @ 0x7fcf80016800] Opening '/private/tmp/com.apple.launchd.W851FkeNXz/org.macosforge.xquartz:0' for reading
ffmpeg stderr: [file @ 0x7fcf7f507a00] Setting default whitelist 'file,crypto,data'
ffmpeg stderr: /private/tmp/com.apple.launchd.W851FkeNXz/org.macosforge.xquartz:0: Operation not supported on socket



  


  Any feedback appreciated

  


• Why does x264 keep giving me "command not found" error on my Mac ? [closed]

  2 juillet 2021, par hd-dvd

  I just installed x264 via Homebrew on my Mac running MacOS 11.4 Big Sur. I'm trying to encode a video but I can't get x264 to run properly.

  


  This is the command I am running in the Terminal :

  


  x264 --bitrate 25000 --preset veryslow --bluray-compat --tune film --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1 --keyint 30 --open-gop --slices 4 --fake-interlaced --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1 --pass 1 -o out.264 in.mp4

  


  and this is what it outputs :

  


  bash: x264 --bitrate 25000 --preset veryslow: command not found

  


  If I delete the --preset part then it just gets hung up on some other part, like --tune.

  


  I have tried brew doctor and there are no errors.

  


  If I just run x264 then it gives me x264 [error]: No input file. Run x264 --help for a list of options. so it seems as if x264 is installed. I don't know where to begin troubleshooting this but I'd like to get it to work.

  


  If I simplify the command way down to x264 -o out.264 in.mp4 then I get :

  


  avs [error]: failed to load avisynth
raw [error]: raw input requires a resolution.
x264 [error]: could not open input file `in.mp4' via any method!


  


  I would greatly appreciate some pointers on how to get this working.