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• nginx + ffmpeg (hls => tmpfs) : io deadlocks

  11 février 2023, par Anton Cheloshkin

  

  


  Hi all !

  


  ffmpeg \ \ -re \ -stream_loop -1 \ \ -i my-live-input(mpegts:h264,aac) \ -c copy \ \ -f hls -hls_time 5 -hls_list_size 5 -hls_wrap 6 -hls_allow_cache 0 \ my-live-output.m3u8

  


  I have a service for distributing HLS video.

  


  several ffmpeg processes write 5 chunks in a loop, each process to its own folder.
this is a live broadcast and a small number of chunks is needed to reduce latency.

  


  nginx publishes files from these folders via http(s)

  


  tmpfs file system

  


  If I start nginx first, and then encoders, then they mutually block access to files. Deadlock IO occurs.

  


  How would you recommend solving this problem ?

  


  Restarting the encoders does not solve the problem.
However, if I restart nginx while the encoders are running, the deadlocks disappear.

  


• FFmpeg : concat protocol gives corrupt output and skips few frames

  11 décembre 2018, par Prashant_Sarin

  Using :

  var command = "-y -i concat:$concatString -c copy -bsf:a aac_adtstoasc $outputFile"

  output video skips few frames in between and jumps from 4th second to 6th sec

  If i use :

  var command = "-y -i concat:$concatString -c:v libx264 -preset ultrafast -crf 30 $outputFile"

  Then, the output is fine but it is taking too much time with the warning of

  [mp4 @ 0xf7228600] Non-monotonous DTS in output stream 0:1

  The logs are as :

  2018-12-11 13:27:19.146 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: onProgress ----Merge---- [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 705608, current: 210096; changing to 705609. This may result in incorrect timestamps in the output file.
  
  2018-12-11 13:27:19.146 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: onProgress ----Merge---- frame=  745 fps=0.0 q=-1.0 Lsize=    1823kB    time=00:03:04.84 bitrate=  80.8kbits/s speed= 758x    
  
  2018-12-11 13:27:19.147 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: onProgress ----Merge---- video:1781kB audio:32kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.563412%
  
  2018-12-11 13:27:19.148 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: Merged successfully message---------ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (GCC)  configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0xf4524600] Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from '/storage/emulated/0/OneDay/Member/128/Video/Story/94071beb-0b5f-4588-b388-ff78d24c07a8/concatVideo.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 695 kb/s
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 693 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, mp4, to '/storage/emulated/0/OneDay/Member/128/Video/Story/94071beb-0b5f-4588-b388-ff78d24c07a8/Final.mp4':
  
    Metadata:
  
      encoder         : Lavf57.25.100
  
      Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 693 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, 2 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0xf4524600] Auto-inserting h264_mp4toannexb bitstream filter
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132096, current: 24152; changing to 132097. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132097, current: 25176; changing to 132098. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132098, current: 26200; changing to 132099. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132099, current: 27224; changing to 132100. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132100, current: 28248; changing to 132101. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132101, current: 29272; changing to 132102. This may result in incorrect timestamps in the output file.

  Last few lines are onSuccess() message of when i run with concat Demuxer.
  All files are *.mp4 files.

• How to remove/reduce pixelation of mjpeg stream in FFMPEG

  10 janvier 2017, par Luis Ruiz

  I’m working on a server side re-streaming service for some IP Cameras.
  I’m using ffserver on Linux to serve the streams and ffmpeg on Windows to feed.
  I’m getting the cameras video (H264) using rtsp.

  My ffserver config example is as follows

  <feed>
  
  File ./test.ffm
  
  </feed>
  
  
  
  <stream>
  
  Feed test.ffm
  
  Format mpjpeg
  
  VideoFrameRate 3
  
  VideoSize 704x480
  
  NoAudio
  
  FileMaxSize 100k 
  
  VideoHighQuality
  
  </stream>

  and the way ffmpeg is feeding :

  ffmpeg -rtsp_transport tcp -i "rtsp://admin:admin@192.168.1.12:554/cam/realmonitor?channel=1&subtype=0" -vcodec copy -acodec copy "http://192.168.1.101:8090/test.ffm"

  Resulting video is Very pixelated and it differs from the real image.

  Cameras’ configuration are as follows :

  Resolution: D1 (704*480)
  
  FrameRate: 3
  
  BitRate: 256k
  
  BitRateType: Variable

  Is there anything i’m missing or doing wrong ?

  Thanks in advance for any help