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• Transcoding with the GCP Transcoder API results in a time gap

  3 mars 2021, par banyan

  I've been trying GCP's Transcoder API and having trouble with the time randomly becoming shorter than specified in certain cases.

  


  The specific cases are as follows :

  


  

  1. Specifying startTimeOffset and endTimeOffset (cut off 2 seconds before and after the video)

  


  2. fMP4 is used as container

  


  3. input video is mp4 with screen recording on iPad Pro

  


  


  For example, if I don't specify startTimeOffset and endTimeOffset, the time will not be shortened. Also, there is no problem when MPEG2-TS is specified for container. There may be a problem with the video itself, but I haven't found a clue how to set it up.

  


  I'm not sure whether this is a problem with the Transcoder API or with me.

  


  The test input video : https://gofile.io/d/DUT9rr

  


  ❯ ffprobe input.mp4
ffprobe version 4.3.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.28)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_8 --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
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: isommp41mp42
    creation_time   : 2021-02-26T15:08:58.000000Z
  Duration: 00:02:51.15, start: 0.000000, bitrate: 551 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 246 kb/s (default)
    Metadata:
      creation_time   : 2021-02-26T15:08:58.000000Z
      handler_name    : Core Media Audio
    Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709/bt709/iec61966-2-1), 1920x1342, 302 kb/s, 12.39 fps, 120 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      rotate          : 180
      creation_time   : 2021-02-26T15:08:58.000000Z
      handler_name    : Core Media Video
    Side data:
      displaymatrix: rotation of -180.00 degrees


  


  #!/bin/bash -eu

cat > request.json << EOF
{
  "config": {
    "inputs": [
      {
        key: "input0"
      }
    ],
    "editList": [
      {
        "key": "atom0",
        "inputs": [
          "input0"
        ],
        "startTimeOffset": "2s",
        "endTimeOffset": "169s",
      },
    ],
    "elementaryStreams": [
      {
        "videoStream": {
          "codec": "h265",
          "heightPixels": 480,
          "bitrateBps": 1200000,
          "rateControlMode": "vbr",
          "enableTwoPass": true,
          "frameRate": 30,
          "crfLevel": 31,
          "gopDuration": "3.0s",
        },
        "key": "h265-stream0"
      },
      {
        "videoStream": {
          "codec": "h265",
          "heightPixels": 720,
          "bitrateBps": 1550000,
          "rateControlMode": "vbr",
          "enableTwoPass": true,
          "frameRate": 30,
          "crfLevel": 31,
          "gopDuration": "3.0s",
        },
        "key": "h265-stream1"
      },
      {
        "videoStream": {
          "codec": "h265",
          "heightPixels": 1080,
          "bitrateBps": 2600000,
          "rateControlMode": "vbr",
          "enableTwoPass": true,
          "frameRate": 30,
          "crfLevel": 31,
          "gopDuration": "3.0s",
        },
        "key": "h265-stream2"
      },
      {
        "audioStream": {
          "codec": "aac",
          "bitrateBps": 64000,
          "channelCount": 2,
          "channelLayout": [
            "fl",
            "fr"
          ],
          "sampleRateHertz": 48000
        },
        "key": "audio-stream0"
      },
    ],
    "muxStreams": [
      {
        "key": "media-sd",
        "fileName": "media-sd.m4s",
        "container": "fmp4",
        "elementaryStreams": [
          "h265-stream0",
        ],
        "segmentSettings": {
          "individualSegments": true
        },
      },
      {
        "key": "media-hd",
        "fileName": "media-hd.m4s",
        "container": "fmp4",
        "elementaryStreams": [
          "h265-stream1",
        ],
        "segmentSettings": {
          "individualSegments": true
        },
      },
      {
        "key": "media-fhd",
        "fileName": "media-fhd.m4s",
        "container": "fmp4",
        "elementaryStreams": [
          "h265-stream2",
        ],
        "segmentSettings": {
          "individualSegments": true
        },
      },
      {
        "key": "audio-only",
        "fileName": "audio-only.m4s",
        "container": "fmp4",
        "elementaryStreams": [
          "audio-stream0"
        ],
        "segmentSettings": {
          "individualSegments": true
        },
      },
    ],
    "manifests": [
      {
        "fileName": "manifest-h265.mpd",
        "type": "DASH",
        "muxStreams": [
          "media-sd",
          "media-hd",
          "media-fhd",
          "audio-only",
        ]
      },
    ]
  }
}
EOF

curl -X POST \
-H "Authorization: Bearer "$(gcloud auth application-default print-access-token) \
-H "Content-Type: application/json; charset=utf-8" \
-d @request.json \
https://transcoder.googleapis.com/v1beta1/projects/MY_PROJECT/locations/asia-east1/jobTemplates?jobTemplateId=test-template


  


  #!/bin/bash -eu

cat > request.json << EOF
{
  "inputUri": "gs://my-bucket/input.mp4",
  "outputUri": "gs://my-bucket/output/",
  "templateId": "test-template"
}
EOF

curl -X POST \
-H "Authorization: Bearer "$(gcloud auth application-default print-access-token) \
-H "Content-Type: application/json; charset=utf-8" \
-d @request.json \
https://transcoder.googleapis.com/v1beta1/projects/MY_PROJECT/locations/asia-east1/jobs


  


  The following is a ffprobe of the resulting manifest file, which is 2 seconds shorter than specified. (expected : 00:02:47.00, actual : 00:02:45.00) In this case, it's a 2-second gap, but it can be 10 seconds or 30 seconds, and it varies from video to video.

  


  ❯ ffprobe manifest-h265.mpd
ffprobe version 4.3.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.28)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_8 --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
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, dash, from 'manifest-h265.mpd':
  Duration: 00:02:45.00, start: 0.000000, bitrate: 0 kb/s
  Program 0
    Stream #0:0: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709/unknown/unknown), 686x480, 112 kb/s, 30 fps, 120 tbr, 10k tbn, 30 tbc
    Metadata:
      variant_bitrate : 113679
      id              : 113679
    Stream #0:1: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709/unknown/unknown), 1030x720, 205 kb/s, 30 fps, 120 tbr, 10k tbn, 30 tbc
    Metadata:
      variant_bitrate : 189219
      id              : 189219
    Stream #0:2: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709/unknown/unknown), 1544x1080, 384 kb/s, 30 fps, 120 tbr, 10k tbn, 30 tbc
    Metadata:
      variant_bitrate : 358043
      id              : 358043
    Stream #0:3: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 65 kb/s
    Metadata:
      variant_bitrate : 70245
      id              : 70245


  


  The following is the time as specified for h264 + MPEG2-TS + Apple HLS.

  


  ❯ ffprobe manifest-h264.m3u8 | pbcopy
ffprobe version 4.3.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.28)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_8 --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
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[hls @ 0x7fe23100f200] Opening 'h264-sd-ts.m3u8' for reading
[hls @ 0x7fe23100f200] Skip ('#EXT-X-VERSION:4')
[hls @ 0x7fe23100f200] Opening 'h264-hd-ts.m3u8' for reading
[hls @ 0x7fe23100f200] Skip ('#EXT-X-VERSION:4')
[hls @ 0x7fe23100f200] Opening 'h264-fhd-ts.m3u8' for reading
[hls @ 0x7fe23100f200] Skip ('#EXT-X-VERSION:4')
[hls @ 0x7fe23100f200] Opening 'h264-sd0000000000.ts' for reading
[hls @ 0x7fe23100f200] Opening 'h264-hd0000000000.ts' for reading
[hls @ 0x7fe23100f200] Opening 'h264-fhd0000000000.ts' for reading
Input #0, hls, from 'manifest-h264.m3u8':
  Duration: 00:02:47.00, start: 0.000000, bitrate: 0 kb/s
  Program 0
    Metadata:
      variant_bitrate : 511576
    Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 686x480, 120 tbr, 90k tbn, 2000k tbc
    Metadata:
      variant_bitrate : 511576
    Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp
    Metadata:
      variant_bitrate : 511576
  Program 1
    Metadata:
      variant_bitrate : 793711
    Stream #0:2: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1030x720, 120 tbr, 90k tbn, 2000k tbc
    Metadata:
      variant_bitrate : 793711
    Stream #0:3: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp
    Metadata:
      variant_bitrate : 793711
  Program 2
    Metadata:
      variant_bitrate : 1305288
    Stream #0:4: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1544x1080, 120 tbr, 90k tbn, 2000k tbc
    Metadata:
      variant_bitrate : 1305288
    Stream #0:5: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp
    Metadata:
      variant_bitrate : 1305288


  


• Cannot use Mobile FFmpeg and LibVLCSharp together in Xamarin.Forms project

  26 février 2021, par Travis P

  I am adding video stream capture functionality to a Xamarin Forms project. I am trying to use VLC's LibVLCSharp.Forms (https://github.com/videolan/libvlcsharp) package and the Mobile ffmpeg Xamarin wrapper package, Laerdal.Xamarin.FFmpeg.* (https://github.com/Laerdal/Laerdal.Xamarin.FFmpeg.iOS). However, the internal ffmpeg library from VLC is conflicting with the ffmpeg wrapper and is built with different flags which exclude functionality that I need.

  


  For native development, it looks like you can configure a preferred library with the OTHER_LDFLAGS flag in the Pods-<your app="app">.debug.xcconfig</your> file but I don't see where to do that with Xamarin.Forms.
Source : https://github.com/tanersener/mobile-ffmpeg/wiki/Using-Multiple-FFmpeg-Implementations-In-The-Same-iOS-Application

  


  How can I configure Xamarin iOS builds to prefer the mobile ffmpeg library over the VLC ffmpeg library ? If I am able to use the mobile ffmpeg library, will it cause issues with VLC ?

  


  Here is a log message when I try to run commands with ffmpeg. As you can see, ffmpeg's internal library paths reference "vlc" :

  


  FFmpegExecute: Command: -vsync 1 -i 'rtsp://wowzaec2demo.streamlock.net/vod/mp4:bigbuckbunny_115k.mov' -force_key_frames "expr: gte(t, n_forced * 2)" -strict experimental -f segment -segment_time 00:00:02 -segment_start_number 0 -reset_timestamps 1 -c:v copy -c:a copy '[path to temp]/tmp/VideoStream/%01d-record-temp.mp4'
Loaded mobile-ffmpeg-full-gpl-x86_64-4.4-lts-20200725
INFO: ffmpeg version v4.4-dev-416
INFO:  Copyright (c) 2000-2020 the FFmpeg developers
INFO:
INFO:   built with Apple LLVM version 7.3.0 (clang-703.0.31)
INFO:   configuration: --sysroot=/Applications/Xcode-v7.3.1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk --prefix=/Users/taner/Projects/mobile-ffmpeg/prebuilt/ios-x86_64/ffmpeg --enable-version3 --arch=x86_64 --cpu=x86_64 --target-os=darwin --ar=/Applications/Xcode-v7.3.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar --cc=clang --cxx=clang++ --as='clang -arch x86_64 -target x86_64-ios-darwin -march=x86-64 -msse4.2 -mpopcnt -m64 -mtune=intel -DMOBILE_FFMPEG_X86_64 -Wno-unused-function -Wno-deprecated-declarations -fstrict-aliasing -DIOS -DMOBILE_FFMPEG_LTS -DMOBILE_FFMPEG_BUILD_DATE=20200725 -isysroot /Applications/Xcode-v7.3.1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk -O2 -mios-simulator-version-min=9.3 -I/Applications/Xcode-v7.3.1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk/usr/include' --ranlib=/Applications/Xcode-v7.3.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib --strip=/Applications/Xcode-v7.3.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip --disable-neon --enable-cross-compile --enable-pic --disable-asm --enable-inline-asm --enable-optimizations --enable-swscale --enable-static --disable-shared --enable-small --disable-v4l2-m2m --disable-outdev=v4l2 --disable-outdev=fbdev --disable-outdev=audiotoolbox --disable-indev=v4l2 --disable-indev=fbdev --disable-openssl --disable-xmm-clobber-test --disable-debug --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libwavpack --enable-libkvazaar --enable-libx264 --enable-gpl --enable-libxvid --enable-gpl --enable-libx265 --enable-gpl --enable-libvidstab --enable-gpl --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libaom --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-zlib --enable-audiotoolbox --enable-bzlib --enable-videotoolbox --disable-avfoundation --enable-iconv --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libwavpack --enable-libkvazaar --enable-libx264 --enable-gpl --enable-libxvid --enable-gpl --enable-libx265 --enable-gpl --enable-libvidstab --enable-gpl --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libaom --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-zlib --enable-audiotoolbox --enable-bzlib --enable-videotoolbox --disable-avfoundation --enable-iconv --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libwavpack --enable-libkvazaar --enable-libx264 --enable-gpl --enable-libxvid --enable-gpl --enable-libx265 --enable-gpl --enable-libvidstab --enable-gpl --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libaom --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-zlib --enable-audiotoolbox --enable-bzlib --enable-videotoolbox --disable-avfoundation --enable-iconv --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libwavpack --enable-libkvazaar --enable-libx264 --enable-gpl --enable-libxvid --enable-gpl --enable-libx265 --enable-gpl --enable-libvidstab --enable-gpl --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libaom --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-zlib --enable-audiotoolbox --enable-bzlib --enable-videotoolbox --disable-avfoundation --enable-iconv
INFO:   WARNING: library configuration mismatch
INFO:   avutil      configuration: --extra-ldflags='-arch x86_64 -v -Wl,-ios_simulator_version_min,8.4 -L/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/lib -Wl,-ios_simulator_version_min,8.4' --cc=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang --pkg-config=pkg-config --disable-doc --disable-encoder=vorbis --disable-decoder=opus --enable-libgsm --disable-decoder=mlp --disable-demuxer=mlp --disable-parser=mlp --disable-debug --disable-avdevice --disable-devices --disable-avfilter --disable-filters --disable-protocol=concat --disable-bsfs --disable-bzlib --disable-libvpx --disable-avresample --enable-bsf=vp9_superframe --disable-swresample --disable-iconv --disable-avisynth --disable-nvenc --disable-linux-perf --disable-securetransport --enable-libopenjpeg --enable-libmp3lame --enable-cross-compile --disable-programs --arch=x86_64 --target-os=darwin --disable-lzma --cpu=core2 --enable-pic --extra-ldflags='-arch x86_64 -miphoneos-version-min=8.4 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.2.sdk -arch x86_64 -O3 -g -miphoneos-version-min=8.4 -arch x86_64 -miphoneos-version-min=8.4 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.2.sdk -arch x86_64 -O3 -g -miphoneos-version-min=8.4 -I/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/include -g -O2 -I/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/include' --enable-pthreads --nm= --ar=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar --prefix=/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64 --enable-static --disable-shared
INFO:   avcodec     configuration: --extra-ldflags='-arch x86_64 -v -Wl,-ios_simulator_version_min,8.4 -L/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/lib -Wl,-ios_simulator_version_min,8.4' --cc=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang --pkg-config=pkg-config --disable-doc --disable-encoder=vorbis --disable-decoder=opus --enable-libgsm --disable-decoder=mlp --disable-demuxer=mlp --disable-parser=mlp --disable-debug --disable-avdevice --disable-devices --disable-avfilter --disable-filters --disable-protocol=concat --disable-bsfs --disable-bzlib --disable-libvpx --disable-avresample --enable-bsf=vp9_superframe --disable-swresample --disable-iconv --disable-avisynth --disable-nvenc --disable-linux-perf --disable-securetransport --enable-libopenjpeg --enable-libmp3lame --enable-cross-compile --disable-programs --arch=x86_64 --target-os=darwin --disable-lzma --cpu=core2 --enable-pic --extra-ldflags='-arch x86_64 -miphoneos-version-min=8.4 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.2.sdk -arch x86_64 -O3 -g -miphoneos-version-min=8.4 -arch x86_64 -miphoneos-version-min=8.4 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.2.sdk -arch x86_64 -O3 -g -miphoneos-version-min=8.4 -I/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/include -g -O2 -I/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/include' --enable-pthreads --nm= --ar=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar --prefix=/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64 --enable-static --disable-shared
INFO:   avformat    configuration: --extra-ldflags='-arch x86_64 -v -Wl,-ios_simulator_version_min,8.4 -L/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/lib -Wl,-ios_simulator_version_min,8.4' --cc=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang --pkg-config=pkg-config --disable-doc --disable-encoder=vorbis --disable-decoder=opus --enable-libgsm --disable-decoder=mlp --disable-demuxer=mlp --disable-parser=mlp --disable-debug --disable-avdevice --disable-devices --disable-avfilter --disable-filters --disable-protocol=concat --disable-bsfs --disable-bzlib --disable-libvpx --disable-avresample --enable-bsf=vp9_superframe --disable-swresample --disable-iconv --disable-avisynth --disable-nvenc --disable-linux-perf --disable-securetransport --enable-libopenjpeg --enable-libmp3lame --enable-cross-compile --disable-programs --arch=x86_64 --target-os=darwin --disable-lzma --cpu=core2 --enable-pic --extra-ldflags='-arch x86_64 -miphoneos-version-min=8.4 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.2.sdk -arch x86_64 -O3 -g -miphoneos-version-min=8.4 -arch x86_64 -miphoneos-version-min=8.4 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.2.sdk -arch x86_64 -O3 -g -miphoneos-version-min=8.4 -I/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/include -g -O2 -I/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/include' --enable-pthreads --nm= --ar=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar --prefix=/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64 --enable-static --disable-shared
INFO:   swscale     configuration: --extra-ldflags='-arch x86_64 -v -Wl,-ios_simulator_version_min,8.4 -L/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/lib -Wl,-ios_simulator_version_min,8.4' --cc=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang --pkg-config=pkg-config --disable-doc --disable-encoder=vorbis --disable-decoder=opus --enable-libgsm --disable-decoder=mlp --disable-demuxer=mlp --disable-parser=mlp --disable-debug --disable-avdevice --disable-devices --disable-avfilter --disable-filters --disable-protocol=concat --disable-bsfs --disable-bzlib --disable-libvpx --disable-avresample --enable-bsf=vp9_superframe --disable-swresample --disable-iconv --disable-avisynth --disable-nvenc --disable-linux-perf --disable-securetransport --enable-libopenjpeg --enable-libmp3lame --enable-cross-compile --disable-programs --arch=x86_64 --target-os=darwin --disable-lzma --cpu=core2 --enable-pic --extra-ldflags='-arch x86_64 -miphoneos-version-min=8.4 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.2.sdk -arch x86_64 -O3 -g -miphoneos-version-min=8.4 -arch x86_64 -miphoneos-version-min=8.4 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.2.sdk -arch x86_64 -O3 -g -miphoneos-version-min=8.4 -I/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/include -g -O2 -I/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64/include' --enable-pthreads --nm= --ar=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar --prefix=/Users/Martz/Projects/vlckit/libvlc/vlc/contrib/iPhone-x86_64-apple-darwin14-x86_64 --enable-static --disable-shared
INFO:   libavutil      56. 55.100 / 56.  5.100
INFO:   libavcodec     58. 96.100 / 58.  6.103
INFO:   libavformat    58. 48.100 / 58.  3.100
INFO:   libavdevice    58. 11.101 / 58. 11.101
INFO:   libavfilter     7. 87.100 /  7. 87.100
INFO:   libswscale      5.  8.100 /  5.  0.101
INFO:   libswresample   3.  8.100 /  3.  8.100
ERROR: Unrecognized option 'segment_time'.
FATAL: Error splitting the argument list:
FATAL: Option not found


  


• Why X.Org's X Server has stopped working on Google Colab ?

  20 février 2021, par Rahul

  I am Using X server for the virtual screen on Google Colab and capturing that screen with ffmpeg to record it and live stream it to twitch. (for the reinforcement learning project)

  


  


  The above process was completely working till my last use of my Colab notebook (on mid-January 2021), but now (on 19th February 2021) I am using the same notebook and the streaming code has stopped working.

  


  


  I am adding config and log file data below. (I have never seen these files before because it was working, now it's not so I don't have any idea what wrong)

  


  The config file stored at /etc/X11/xorg.conf have the following data :

  


  # nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 418.67

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/mouse"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "Tesla T4"
    BusID          "PCI:0:4:0"
    MatchSeat      "seat-1"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "AllowEmptyInitialConfiguration" "True"
    SubSection     "Display"
        Virtual     1920 1080
        Depth       24
    EndSubSection
EndSection


  


  The log file stored at /var/log/Xorg.0.log have the following data :

  


  [   464.605] 
X.Org X Server 1.19.6
Release Date: 2017-12-20
[   464.605] X Protocol Version 11, Revision 0
[   464.605] Build Operating System: Linux 4.15.0-124-generic x86_64 Ubuntu
[   464.605] Current Operating System: Linux 9d3fe3949671 4.19.112+ #1 SMP Thu Jul 23 08:00:38 PDT 2020 x86_64
[   464.605] Kernel command line: BOOT_IMAGE=/syslinux/vmlinuz.A init=/usr/lib/systemd/systemd boot=local rootwait ro noresume noswap loglevel=7 noinitrd console=ttyS0 security=apparmor virtio_net.napi_tx=1 systemd.unified_cgroup_hierarchy=false systemd.legacy_systemd_cgroup_controller=false csm.disabled=1 dm_verity.error_behavior=3 dm_verity.max_bios=-1 dm_verity.dev_wait=1 i915.modeset=1 cros_efi loadpin.enabled=0 root=/dev/dm-0 "dm=1 vroot none ro 1,0 4077568 verity payload=PARTUUID=555BDB75-CBD7-CD4A-B24E-29B13D7AC0DF hashtree=PARTUUID=555BDB75-CBD7-CD4A-B24E-29B13D7AC0DF hashstart=4077568 alg=sha256 root_hexdigest=42104d547ac104fb7061529e78f53e4f3e8c3d3cbb040dc6e0f84aad68491347 salt=9dc7f3acc4e2ce65be16356e960c2b21b51a917fa31d2e891fd295490c991e41" mitigations=off
[   464.605] Build Date: 30 November 2020  08:01:56PM
[   464.605] xorg-server 2:1.19.6-1ubuntu4.8 (For technical support please see http://www.ubuntu.com/support) 
[   464.605] Current version of pixman: 0.34.0
[   464.605]    Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.
[   464.605] Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[   464.605] (==) Log file: "/var/log/Xorg.0.log", Time: Sat Feb 20 03:10:44 2021
[   464.606] (==) Using config file: "/etc/X11/xorg.conf"
[   464.606] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[   464.607] (==) ServerLayout "Layout0"
[   464.607] (**) |-->Screen "Screen0" (0)
[   464.607] (**) |   |-->Monitor "Monitor0"
[   464.607] (**) |   |-->Device "Device0"
[   464.607] (**) |-->Input Device "Keyboard0"
[   464.607] (**) |-->Input Device "Mouse0"
[   464.607] (==) Automatically adding devices
[   464.607] (==) Automatically enabling devices
[   464.607] (==) Automatically adding GPU devices
[   464.607] (==) Automatically binding GPU devices
[   464.607] (==) Max clients allowed: 256, resource mask: 0x1fffff
[   464.607] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[   464.607]    Entry deleted from font path.
[   464.607] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[   464.607]    Entry deleted from font path.
[   464.607] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[   464.607]    Entry deleted from font path.
[   464.607] (WW) The directory "/usr/share/fonts/X11/Type1" does not exist.
[   464.607]    Entry deleted from font path.
[   464.607] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[   464.607]    Entry deleted from font path.
[   464.607] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[   464.607]    Entry deleted from font path.
[   464.607] (==) FontPath set to:
    /usr/share/fonts/X11/misc,
    built-ins
[   464.607] (==) ModulePath set to "/usr/lib/xorg/modules"
[   464.607] (WW) Hotplugging is on, devices using drivers 'kbd', 'mouse' or 'vmmouse' will be disabled.
[   464.607] (WW) Disabling Keyboard0
[   464.607] (WW) Disabling Mouse0
[   464.607] (II) Loader magic: 0x556eb77b8020
[   464.607] (II) Module ABI versions:
[   464.607]    X.Org ANSI C Emulation: 0.4
[   464.607]    X.Org Video Driver: 23.0
[   464.607]    X.Org XInput driver : 24.1
[   464.607]    X.Org Server Extension : 10.0
[   464.607] (EE) dbus-core: error connecting to system bus: org.freedesktop.DBus.Error.FileNotFound (Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory)
[   464.609] (--) PCI: (0:0:4:0) 10de:1eb8:10de:12a2 rev 161, Mem @ 0xc0000000/16777216, 0x380000000/268435456, 0x390000000/33554432
[   464.609] (II) no primary bus or device found
[   464.609] (II) LoadModule: "glx"
[   464.609] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[   464.610] (II) Module glx: vendor="X.Org Foundation"
[   464.610]    compiled for 1.19.6, module version = 1.0.0
[   464.610]    ABI class: X.Org Server Extension, version 10.0
[   464.610] (II) LoadModule: "nvidia"
[   464.610] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
[   464.610] (II) Module nvidia: vendor="NVIDIA Corporation"
[   464.610]    compiled for 4.0.2, module version = 1.0.0
[   464.610]    Module class: X.Org Video Driver
[   464.610] (II) NVIDIA dlloader X Driver  418.67  Sat Apr  6 02:51:17 CDT 2019
[   464.610] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[   464.610] xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)
[   464.610] (II) Loading sub module "fb"
[   464.610] (II) LoadModule: "fb"
[   464.611] (II) Loading /usr/lib/xorg/modules/libfb.so
[   464.611] (II) Module fb: vendor="X.Org Foundation"
[   464.611]    compiled for 1.19.6, module version = 1.0.0
[   464.611]    ABI class: X.Org ANSI C Emulation, version 0.4
[   464.611] (II) Loading sub module "wfb"
[   464.611] (II) LoadModule: "wfb"
[   464.611] (II) Loading /usr/lib/xorg/modules/libwfb.so
[   464.611] (II) Module wfb: vendor="X.Org Foundation"
[   464.611]    compiled for 1.19.6, module version = 1.0.0
[   464.611]    ABI class: X.Org ANSI C Emulation, version 0.4
[   464.611] (II) Loading sub module "ramdac"
[   464.611] (II) LoadModule: "ramdac"
[   464.611] (II) Module "ramdac" already built-in
[   464.637] (EE) NVIDIA: Failed to initialize the NVIDIA kernel module. Please see the
[   464.637] (EE) NVIDIA:     system's kernel log for additional error messages and
[   464.637] (EE) NVIDIA:     consult the NVIDIA README for details.
[   464.662] (EE) NVIDIA: Failed to initialize the NVIDIA kernel module. Please see the
[   464.662] (EE) NVIDIA:     system's kernel log for additional error messages and
[   464.662] (EE) NVIDIA:     consult the NVIDIA README for details.
[   464.662] (EE) No devices detected.
[   464.662] (==) Matched modesetting as autoconfigured driver 0
[   464.662] (==) Matched fbdev as autoconfigured driver 1
[   464.662] (==) Matched vesa as autoconfigured driver 2
[   464.662] (==) Assigned the driver to the xf86ConfigLayout
[   464.662] (II) LoadModule: "modesetting"
[   464.662] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[   464.663] (II) Module modesetting: vendor="X.Org Foundation"
[   464.663]    compiled for 1.19.6, module version = 1.19.6
[   464.663]    Module class: X.Org Video Driver
[   464.663]    ABI class: X.Org Video Driver, version 23.0
[   464.663] (II) LoadModule: "fbdev"
[   464.663] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[   464.663] (II) Module fbdev: vendor="X.Org Foundation"
[   464.663]    compiled for 1.19.3, module version = 0.4.4
[   464.663]    Module class: X.Org Video Driver
[   464.663]    ABI class: X.Org Video Driver, version 23.0
[   464.663] (II) LoadModule: "vesa"
[   464.663] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[   464.663] (II) Module vesa: vendor="X.Org Foundation"
[   464.663]    compiled for 1.19.3, module version = 2.3.4
[   464.663]    Module class: X.Org Video Driver
[   464.663]    ABI class: X.Org Video Driver, version 23.0
[   464.663] (II) NVIDIA dlloader X Driver  418.67  Sat Apr  6 02:51:17 CDT 2019
[   464.663] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[   464.663] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[   464.663] (II) FBDEV: driver for framebuffer: fbdev
[   464.663] (II) VESA: driver for VESA chipsets: vesa
[   464.663] xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)
[   464.663] (EE) open /dev/dri/card0: No such file or directory
[   464.663] (WW) Falling back to old probe method for modesetting
[   464.663] (EE) open /dev/dri/card0: No such file or directory
[   464.663] (WW) Falling back to old probe method for fbdev
[   464.663] (II) Loading sub module "fbdevhw"
[   464.663] (II) LoadModule: "fbdevhw"
[   464.663] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[   464.663] (II) Module fbdevhw: vendor="X.Org Foundation"
[   464.663]    compiled for 1.19.6, module version = 0.0.2
[   464.663]    ABI class: X.Org Video Driver, version 23.0
[   464.664] (EE) open /dev/fb0: No such file or directory
[   464.664] (WW) Falling back to old probe method for vesa
[   464.664] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[   464.664] (EE) Screen 0 deleted because of no matching config section.
[   464.664] (II) UnloadModule: "modesetting"
[   464.664] (EE) Device(s) detected, but none match those in the config file.
[   464.664] (EE) 
Fatal server error:
[   464.664] (EE) no screens found(EE) 
[   464.664] (EE) 
Please consult the The X.Org Foundation support 
     at http://wiki.x.org
 for help. 
[   464.664] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[   464.664] (EE) 
[   464.664] (EE) Server terminated with error (1). Closing log file.



  


  I am using this github repo to setup the video-streamer

  


  If anyone wants the colab notebook for the example then I will add it over here.

  


  For this problem I am really not sure where to file an issue for this so that's why I am writing this here.