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  • Prevent ffmpeg from changing the intensity of colors while downscaling the resolution of the video

    29 août 2022, par dravit

    I have a use case where I need to downscale a 716x1280 mp4 video to 358x640 (half of the original). Command that I used is

    


    ffmpeg -i ./input.mp4 -vf "scale=640:640:force_original_aspect_ratio=decrease,pad=ceil(iw/2)*2:ceil(ih/2)*2" ./output.mp4


    


    Out of 10 sample videos, 2 of the them suffered impact on colors. Below I have attached a comparison from the one which was impacted the most.

    


    Comparison of frames from the most impacted video

    


    NOTE : The one on the right is a frame from the original video and the frame on the left is the one from the processed (down scaled) video. Notice the colors red and green in the image (even the skin color and hair color were changed).

    


    What I am looking for is

    


      

    • Is there any way I can prevent changes like these happening ? Probably some flag on saturation, brightness, contrast or any other parameter.
    • 


    • I am assuming that ffmpeg uses some default settings while downscaling a video. What made ffmpeg change colors only for these two videos ? If it made similar changes for the rest of the videos as well, how to predict this behaviour before hand ?
    • 


    


    EDIT :

    


    What I already have Tried ?

    


      

    • -crf with values 0 and 18.
    • 


    • -preset veryslow as mentioned here
    • 


    


    None helped

    


    Mediainfo input V/S output

    


    





    


    


    


    


    


    



    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    param input output
    color range Limited NA (attribute not in description)
    color primaries BT.2020 NA (attribute not in description)
    transfer characteristics HLG NA (attribute not in description)
    matrix coefficients BT.2020 non-constant NA (attribute not in description)
    bit deapth 8 8

    


    


    Logs of the ffmpeg command

    


    ffmpeg -i ./input.mp4 -vf "scale=640:640:force_original_aspect_ratio=decrease,pad=ceil(iw/2)*2:ceil(ih/2)*2" -movflags +faststart ./output.mp4
ffmpeg version 4.3.1 Copyright (c) 2000-2020 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_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
  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     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:30.05, start: 0.000000, bitrate: 10366 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt2020nc/bt2020/arib-std-b67), 716x1280, 10116 kb/s, 30 fps, 30 tbr, 19200 tbn, 38400 tbc (default)
    Metadata:
      handler_name    : Core Media Video
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 245 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x7faab4808800] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7faab4808800] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 0x7faab4808800] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to './output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 358x640, q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
    Metadata:
      handler_name    : Core Media Video
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
      encoder         : Lavc58.91.100 aac
[mp4 @ 0x7faab5808800] Starting second pass: moving the moov atom to the beginning of the file
frame=  901 fps=210 q=-1.0 Lsize=    3438kB time=00:00:30.02 bitrate= 938.0kbits/s speed=7.01x
video:2933kB audio:472kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.974633%
[libx264 @ 0x7faab4808800] frame I:6     Avg QP:22.60  size: 20769
[libx264 @ 0x7faab4808800] frame P:228   Avg QP:24.84  size:  7657
[libx264 @ 0x7faab4808800] frame B:667   Avg QP:27.59  size:  1697
[libx264 @ 0x7faab4808800] consecutive B-frames:  0.9%  0.9%  1.0% 97.2%
[libx264 @ 0x7faab4808800] mb I  I16..4:  9.5% 64.6% 26.0%
[libx264 @ 0x7faab4808800] mb P  I16..4:  2.5% 12.2%  2.5%  P16..4: 37.2% 20.6% 11.2%  0.0%  0.0%    skip:13.7%
[libx264 @ 0x7faab4808800] mb B  I16..4:  0.4%  2.1%  0.2%  B16..8: 42.2%  7.1%  1.2%  direct: 1.8%  skip:44.9%  L0:39.4% L1:52.8% BI: 7.8%
[libx264 @ 0x7faab4808800] 8x8 transform intra:72.2% inter:74.2%
[libx264 @ 0x7faab4808800] coded y,uvDC,uvAC intra: 61.8% 67.2% 20.2% inter: 16.7% 13.9% 1.3%
[libx264 @ 0x7faab4808800] i16 v,h,dc,p: 24% 19%  7% 50%
[libx264 @ 0x7faab4808800] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 16% 15%  6%  9% 11%  7% 10%  6%
[libx264 @ 0x7faab4808800] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 16% 13%  7%  9% 10%  7%  9%  4%
[libx264 @ 0x7faab4808800] i8c dc,h,v,p: 53% 16% 26%  5%
[libx264 @ 0x7faab4808800] Weighted P-Frames: Y:3.9% UV:1.8%
[libx264 @ 0x7faab4808800] ref P L0: 57.8% 19.5% 14.8%  7.8%  0.1%
[libx264 @ 0x7faab4808800] ref B L0: 90.7%  7.2%  2.1%
[libx264 @ 0x7faab4808800] ref B L1: 95.3%  4.7%
[libx264 @ 0x7faab4808800] kb/s:799.80
[aac @ 0x7faab2036a00] Qavg: 189.523


    


  • FFmpeg stream stops after a certain time

    7 avril 2021, par Anarno

    We have a little Nodejs app, which starts a stream process, with a child_process.spawn. On the client-side, we have an HTML5-canvas element, which records the video data new MediaRecorder(canvas.captureStream(30), config), then this client sends its data to our Nodejs server over a WebSocket connection. We using FFmpeg for video encoding and decoding, then we send the data to our 3-rd party service (MUX), which accepts the stream and broadcasts them. Sadly the process continuously loses its fps, and after in general 1 minute, stops with an interesting error code. (when we save the video result locally instead of streaming via rtmps, it works perfectly.

    


    *The whole system is in docker.

    


    The error :

    


     stderr: [tls @ 0x7f998e7bca40] Error in the pull function.&#xA;Our_app_logs:    | av_interleaved_write_frame(): I/O error    &#xA;Our_app_logs:    | [flv @ 0x7f998eeb1680] Failed to update header with correct duration.&#xA;Our_app_logs:    | [flv @ 0x7f998eeb1680] Failed to update header with correct filesize.&#xA;Our_app_logs:    | Error writing trailer of rtmps://global-live.mux.com/app/94e85197-78a3-f092-3437-03d93aba74e0: I/O error&#xA;Our_app_logs:    |  <buffer 5b="5b" 74="74" 6c="6c" 73="73" 20="20" 40="40" 30="30" 78="78" 37="37" 66="66" 39="39" 38="38" 65="65" 62="62" 63="63" 61="61" 34="34" 5d="5d" 45="45" 72="72" 6f="6f" 69="69" 6e="6e" 68="68" 70="70" 75="75" 2e="2e">&#xA;Our_app_logs:    | stderr: frame= 1478 fps= 25 q=23.0 Lsize=  &#xA;   402kB time=00:01:02.89 bitrate=  52.4kbits/s speed=1.05x&#xA;Our_app_logs:    | video:369kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.034639%&#xA;Our_app_logs:    |  <buffer 66="66" 72="72" 61="61" 6d="6d" 65="65" 3d="3d" 20="20" 31="31" 34="34" 37="37" 38="38" 70="70" 73="73" 32="32" 35="35" 71="71" 33="33" 2e="2e" 30="30" 4c="4c" 69="69" 7a="7a" 6b="6b" 42="42" 74="74">&#xA;Our_app_logs:    | stderr: [tls @ 0x7f998e7bca40]  <buffer 5b="5b" 6c="6c" 73="73" 20="20" 40="40" 30="30" 78="78" 37="37" 66="66" 39="39" 38="38" 65="65" 62="62" 63="63" 61="61" 34="34" 5d="5d">    &#xA;Our_app_logs:    | stderr: The specified session has been invalidated for some reason.&#xA;Our_app_logs:    |  <buffer 54="54" 68="68" 65="65" 20="20" 73="73" 70="70" 63="63" 69="69" 66="66" 64="64" 6f="6f" 6e="6e" 61="61" 62="62" 76="76" 6c="6c" 74="74" 72="72" 6d="6d">&#xA;Our_app_logs:    | stderr:     Last message repeated 1 times  &#xA;Our_app_logs:    |  <buffer 20="20" 4c="4c" 61="61" 73="73" 74="74" 6d="6d" 65="65" 67="67" 72="72" 70="70" 64="64" 31="31" 69="69" 0a="0a">  &#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: frame I:13    Avg QP: 5.39  size:  &#xA;2478&#xA;Our_app_logs:    |  <buffer 66="66" 72="72" 61="61" 6d="6d" 65="65" 20="20" 49="49" 3a="3a" 31="31" 33="33" 41="41" 76="76" 67="67" 51="51" 50="50" 35="35" 2e="2e" 39="39" 73="73" 69="69" 7a="7a" 32="32" 34="34" 37="37" 38="38" 0a="0a">&#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: frame P:1465  Avg QP:13.51  size:  &#xA; 235&#xA;Our_app_logs:    |  <buffer 66="66" 72="72" 61="61" 6d="6d" 65="65" 20="20" 50="50" 3a="3a" 31="31" 34="34" 36="36" 35="35" 41="41" 76="76" 67="67" 51="51" 33="33" 2e="2e" 73="73" 69="69" 7a="7a" 32="32" 0a="0a">&#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: mb I  I16..4: 99.2%  0.1%  0.7%    &#xA;Our_app_logs:    |  <buffer 6d="6d" 62="62" 20="20" 49="49" 31="31" 36="36" 2e="2e" 34="34" 3a="3a" 39="39" 32="32" 25="25" 30="30" 37="37" 0a="0a">        &#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: mb P  I16..4:  0.3%  0.0%  0.0%  P16..4:  0.1%  0.0%  0.0%  0.0%  0.0%    skip:99.6%&#xA;Our_app_logs:    |  <buffer 6d="6d" 62="62" 20="20" 50="50" 49="49" 31="31" 36="36" 2e="2e" 34="34" 3a="3a" 30="30" 33="33" 25="25">&#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: 8x8 transform intra:0.3% inter:17.3%&#xA;Our_app_logs:    |  <buffer 38="38" 78="78" 20="20" 74="74" 72="72" 61="61" 6e="6e" 73="73" 66="66" 6f="6f" 6d="6d" 69="69" 3a="3a" 30="30" 2e="2e" 33="33" 25="25" 65="65" 31="31" 37="37" 0a="0a">&#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: coded y,uvDC,uvAC intra: 1.4% 6.9% &#xA;4.7% inter: 0.0% 0.0% 0.0%&#xA;Our_app_logs:    |  <buffer 63="63" 6f="6f" 64="64" 65="65" 20="20" 79="79" 2c="2c" 75="75" 76="76" 44="44" 43="43" 41="41" 69="69" 6e="6e" 74="74" 72="72" 61="61" 3a="3a" 31="31" 2e="2e" 34="34" 25="25" 36="36" 39="39" 37="37" 30="30">&#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: i16 v,h,dc,p: 90%  5%  5%  0%&#xA;Our_app_logs:    |  <buffer 69="69" 31="31" 36="36" 20="20" 76="76" 2c="2c" 68="68" 64="64" 63="63" 70="70" 3a="3a" 39="39" 30="30" 25="25" 35="35" 0a="0a">&#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% &#xA;18% 51%  6%  0%  0%  0%  0%  3%&#xA;Our_app_logs:    |  <buffer 69="69" 38="38" 20="20" 76="76" 2c="2c" 68="68" 64="64" 63="63" 6c="6c" 72="72" 75="75" 3a="3a" 32="32" 33="33" 25="25" 31="31" 35="35" 36="36" 30="30">&#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% &#xA;25% 40%  0%  0%  0%  0%  0%  0%&#xA;Our_app_logs:    |  <buffer 69="69" 34="34" 20="20" 76="76" 2c="2c" 68="68" 64="64" 63="63" 6c="6c" 72="72" 75="75" 3a="3a" 33="33" 25="25" 32="32" 35="35" 30="30">&#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: i8c dc,h,v,p: 86%  7%  6%  0%&#xA;Our_app_logs:    |  <buffer 69="69" 38="38" 63="63" 20="20" 64="64" 2c="2c" 68="68" 76="76" 70="70" 3a="3a" 36="36" 25="25" 37="37" 30="30" 0a="0a">&#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: Weighted P-Frames: Y:0.1% UV:0.1%  &#xA;Our_app_logs:    |  <buffer 57="57" 65="65" 69="69" 67="67" 68="68" 74="74" 64="64" 20="20" 50="50" 2d="2d" 46="46" 72="72" 61="61" 6d="6d" 73="73" 3a="3a" 59="59" 30="30" 2e="2e" 31="31" 25="25" 55="55" 56="56" 0a="0a">  &#xA;Our_app_logs:    | stderr: [libx264 @ 0x7f998e790080]  <buffer 5b="5b" 6c="6c" 69="69" 62="62" 78="78" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 37="37" 66="66" 39="39" 38="38" 65="65" 5d="5d">&#xA;Our_app_logs:    | stderr: kb/s:2041.23&#xA;Our_app_logs:    |  <buffer 6b="6b" 62="62" 2f="2f" 73="73" 3a="3a" 32="32" 30="30" 34="34" 31="31" 2e="2e" 33="33" 0a="0a">&#xA;Our_app_logs:    | stderr: Conversion failed!&#xA;Our_app_logs:    |  <buffer 43="43" 6f="6f" 6e="6e" 76="76" 65="65" 72="72" 73="73" 69="69" 20="20" 66="66" 61="61" 6c="6c" 64="64" 21="21" 0a="0a">&#xA;Our_app_logs:    | close, code: 1, signal: null&#xA;Our_app_logs:    | from react application: 14203&#xA;Our_app_logs:    | Status ok...&#xA;Our_app_logs:    | Data ok...&#xA;Our_app_logs:    | FFmpeg ok...&#xA;Our_app_logs:    | Writeable ok... <buffer c4="c4" 81="81" 0e="0e" 11="11" 00="00" 01="01" 61="61" c7="c7" 80="80" 5b="5b" b6="b6" 72="72" 03="03" bc="bc" b7="b7" de="de" 59="59" 7f="7f" 3c="3c" 27="27" b3="b3" 87="87" b2="b2" e6="e6" 84="84" d0="d0" f0="f0" 02="02" 2d="2d" c0="c0" 08="08" 70="70"> undefined&#xA;Our_app_logs:    | stderr: ffmpeg version 4.2.4 Copyright (c) &#xA;2000-2020 the FFmpeg developers&#xA;Our_app_logs:    |   built with gcc 9.2.0 (Alpine 9.2.0)&#xA;Our_app_logs:    |   configuration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --disable-stripping --disable-static --disable-librtmp --enable-vaapi --enable-vdpau --enable-libopus --disable-debug&#xA;Our_app_logs:    |  <buffer 66="66" 6d="6d" 70="70" 65="65" 67="67" 20="20" 76="76" 72="72" 73="73" 69="69" 6f="6f" 6e="6e" 34="34" 2e="2e" 32="32" 43="43" 79="79" 68="68" 74="74" 28="28" 63="63" 29="29" 30="30" 2d="2d" 46="46">&#xA;Our_app_logs:    | stderr:   libavutil      56. 31.100 / 56. 31.100&#xA;Our_app_logs:    |   libavcodec     58. 54.100 / 58. 54.100   &#xA;Our_app_logs:    |   libavformat    58. 29.100 / 58. 29.100&#xA;Our_app_logs:    |   libavdevice    58.  8.100 / 58.  8.100&#xA;Our_app_logs:    |   libavfilter     7. 57.100 /  7. 57.100&#xA;Our_app_logs:    |   libavresample   4.  0.  0 /  4.  0.  0   &#xA;Our_app_logs:    |   libswscale      5.  5.100 /  5.  5.100   &#xA;Our_app_logs:    |   libswresample   3.  5.100 /  3.  5.100   &#xA;Our_app_logs:    |   libpostproc    55.  5.100 / 55.  5.100   &#xA;Our_app_logs:    |  <buffer 20="20" 6c="6c" 69="69" 62="62" 61="61" 76="76" 75="75" 74="74" 35="35" 36="36" 2e="2e" 33="33" 31="31" 30="30" 2f="2f" 0a="0a" 63="63" 6f="6f">&#xA;Our_app_logs:    | stderr: [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    |     Last message repeated 4 times&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] no frame!&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    |  <buffer 5b="5b" 68="68" 32="32" 36="36" 34="34" 20="20" 40="40" 30="30" 78="78" 37="37" 66="66" 39="39" 5d="5d" 6e="6e" 6f="6f" 2d="2d" 65="65" 69="69" 73="73" 74="74" 67="67" 50="50" 53="53" 31="31" 72="72">&#xA;Our_app_logs:    | stderr: [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] no frame!&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] no frame!&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] no frame!&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    |     Last message repeated 5 times&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] no frame!&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] no frame!&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_headerOur_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] no frame!&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] no frame!&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] non-existing PPS 14 referenced&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] decode_slice_header error&#xA;Our_app_logs:    | [h264 @ 0x7f299f44f600] no frame!&#xA;&#xA;</buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer></buffer>

    &#xA;

    The FFmpeg config :

    &#xA;

    const FFMPEG_CONFIG = [&#xA;  &#x27;-i&#x27;,&#xA;  &#x27;-&#x27;,&#xA;&#xA;  // video codec config: low latency, adaptive bitrate&#xA;  //   &#x27;-vcodec&#x27;,&#xA;  //   &#x27;copy&#x27;,&#xA;  &#x27;-c:v&#x27;,&#xA;  &#x27;libx264&#x27;,&#xA;  &#x27;-preset&#x27;,&#xA;  &#x27;veryfast&#x27;,&#xA;  &#x27;-tune&#x27;,&#xA;  &#x27;zerolatency&#x27;,&#xA;&#xA;  // audio codec config: sampling frequency (11025, 22050, 44100), bitrate 64 kbits&#xA;  &#x27;-c:a&#x27;,&#xA;  &#x27;aac&#x27;,&#xA;  &#x27;-ar&#x27;,&#xA;  &#x27;44100&#x27;,&#xA;  &#x27;-b:a&#x27;,&#xA;  &#x27;64k&#x27;,&#xA;&#xA;  //force to overwrite&#xA;  &#x27;-y&#x27;,&#xA;&#xA;  // used for audio sync&#xA;  &#x27;-use_wallclock_as_timestamps&#x27;,&#xA;  &#x27;1&#x27;,&#xA;  &#x27;-async&#x27;,&#xA;  &#x27;1&#x27;,&#xA;&#xA;  //&#x27;-filter_complex&#x27;, &#x27;aresample=44100&#x27;, // resample audio to 44100Hz, needed if input is not 44100&#xA;  //&#x27;-strict&#x27;, &#x27;experimental&#x27;,&#xA;  &#x27;-bufsize&#x27;,&#xA;  &#x27;1000&#x27;,&#xA;  &#x27;-f&#x27;,&#xA;  &#x27;flv&#x27;,&#xA;];&#xA;

    &#xA;

    The process :

    &#xA;

    const process = child_process.spawn(&#x27;ffmpeg&#x27;, [&#xA;      ...FFMPEG_CONFIG,&#xA;      //   &#x27;local.bin&#x27;,&#xA;      url,&#xA;    ]);&#xA; &#xA;    process.stderr.on(&#x27;data&#x27;, data => {&#xA;      console.log(`stderr: ${data}`, data);&#xA;    });&#xA;&#xA;    process.stdin.on(&#x27;error&#x27;, e => {&#xA;      console.log(&#x27;FFmpeg STDIN Error&#x27;, e);&#xA;    });&#xA;&#xA;    process.on(&#x27;error&#x27;, err => console.log(err));&#xA;&#xA;    process.on(&#x27;close&#x27;, (code, signal) => {&#xA;      console.log(`close, code: ${code}, signal: ${signal}`);&#xA;    });&#xA;

    &#xA;

    The writing :

    &#xA;

    if (!Buffer.isBuffer(data)) return;&#xA;if (!process.stdin.writable) return;&#xA;process.stdin.write(data);&#xA;

    &#xA;

  • .mp4 file is not playing in Django template and FireFox or Chrome

    9 février 2021, par Himanshu sharma

    I can save live RTSP video stream in .mp4 but when I run saved .mp4 video in Django template or Firefox or Chrome browser or VLC, video is not playing in ubuntu.&#xA;I think I have a compatible issue problem in .mp4. Furthermore, I want to show and play .mp4 saved file in Django.

    &#xA;

    I have a two IP camera which provides a live RTSP video stream.

    &#xA;

    self.input_stream---> rtsp://admin:Admin123@192.168.1.208/user=admin_password=Admin123_channel=0channel_number_stream=0.sdp&#xA;&#xA;self.input_stream---> rtsp://Admin:@192.168.1.209/user=Admin_password=_channel=0channel_number_stream=0.sdp&#xA;

    &#xA;

    Python 3.8.5 (default, Jul 28 2020, 12:59:40)&#xA;[GCC 9.3.0] on linux,

    &#xA;

    Django==3.1.2

    &#xA;

    I am implementing this code in difference Ubuntu PCs

    &#xA;

    Ubuntu = 18.04 and 20.04

    &#xA;

    opencv-contrib-python==4.4.0.46

    &#xA;

    opencv-python==4.4.0.46

    &#xA;

    ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers&#xA;built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)

    &#xA;

    I had tried different fourcc to save .mp4 but below fourcc work perfectly in Ubuntu.

    &#xA;

    fourcc = cv2.VideoWriter_fourcc(*'mp4v')

    &#xA;

    class ffmpegStratStreaming(threading.Thread):&#xA;    def __init__(self, input_stream=None, output_stream=None, camera=None, *args, **kwargs):&#xA;        self.input_stream = input_stream&#xA;        self.output_stream = output_stream&#xA;        self.camera = camera&#xA;        super().__init__(*args, **kwargs)&#xA;&#xA;    def run(self):&#xA;        try:vs = cv2.VideoCapture(self.input_stream)&#xA;            fps_rate = int(vs.get(cv2.CAP_PROP_FPS))&#xA;            ##############################&#xA;            ##############################  &#xA;            # ~ print(&#x27;fps rate-->&#x27;, fps_rate,&#x27;camera id-->&#x27; ,str(self.camera.id))&#xA;            # ~ vs.set(cv2.CAP_PROP_POS_FRAMES,50)  #Set the frame number to be obtained&#xA;            # ~ print(&#x27;fps rate-->&#x27;, fps_rate,&#x27;camera id-->&#x27; ,str(self.camera.id),&#x27; ####### &#x27;)&#xA;            &#xA;            # initialize the video writer (we&#x27;ll instantiate later if need be)&#xA;            writer = None&#xA;&#xA;            # initialize the frame dimensions (we&#x27;ll set them as soon as we read&#xA;            # the first frame from the video)&#xA;            W = None&#xA;            H = None    &#xA;            # start the frames per second throughput estimator&#xA;            fps = FPS().start()&#xA;&#xA;            #  saving frame in avi video format&#xA;            video_file_count = 0&#xA;            start_time = time.time()&#xA;&#xA;            while True:&#xA;                try:&#xA;                    # grab the next frame and handle if we are reading from either&#xA;                    # VideoCapture or VideoStream&#xA;                    &#xA;                    frame_init = vs.read()&#xA;                    frame = frame_init[1] if self.input_stream else frame_init&#xA;                    &#xA;                    # if frame is can&#x27;t read correctly ret is False&#xA;                    while frame_init[0] == False:&#xA;                        print("Can&#x27;t receive frame. Retrying ...")&#xA;                        vs.release()&#xA;                        vs = cv2.VideoCapture(self.input_stream)                                                                              &#xA;                        frame_init = vs.read()&#xA;                        frame = frame_init[1] if self.input_stream else frame_init&#xA;&#xA;                    # if we are viewing a video and we did not grab a frame then we&#xA;                    # have reached the end of the video&#xA;                    if self.input_stream is not None and frame is None:&#xA;                        break&#xA;&#xA;                    # resize the frame to have a maximum width of 500 pixels (the&#xA;                    # less data we have, the faster we can process it), then convert&#xA;                    # the frame from BGR to RGB for dlib&#xA;                    frame = imutils.resize(frame, width=500)        &#xA;                    &#xA;                    &#xA;                    #&lt;---------------------- Start of  writing a video to disk ------------------------->                   &#xA;                    minute = 1&#xA;                    second  = 60&#xA;                    minite_to_save_video = int(minute) * int(second)&#xA;&#xA;                &#xA;                    # if we are supposed to be writing a video to disk, initialize&#xA;                    if time.time() - start_time >= minite_to_save_video or  video_file_count == 0 :&#xA;                        ## where H = heigth, W = width, C = channel &#xA;                        H, W, C = frame.shape&#xA;                        video_file_count &#x2B;= 1&#xA;                        start_time = time.time()&#xA;                        output_save_directory = self.output_stream&#x2B;str(video_file_count)&#x2B;&#x27;.mp4&#x27;&#xA;                        # fourcc = cv2.VideoWriter_fourcc(*"MJPG")&#xA;                        # fourcc = cv2.VideoWriter_fourcc(*&#x27;XVID&#x27;)&#xA;                        # fourcc = cv2.VideoWriter_fourcc(*&#x27;X264&#x27;)&#xA;                        # fourcc = cv2.VideoWriter_fourcc(*&#x27;MP4V&#x27;)&#xA;&#xA;                        &#xA;                        # fourcc = cv2.VideoWriter_fourcc(*&#x27;FMP4&#x27;)&#xA;&#xA;                        # fourcc = cv2.VideoWriter_fourcc(*&#x27;avc1&#x27;)&#xA;&#xA;&#xA;                        # fourcc = cv2.VideoWriter_fourcc(&#x27;M&#x27;,&#x27;J&#x27;,&#x27;P&#x27;,&#x27;G&#x27;)&#xA;&#xA;                        fourcc = cv2.VideoWriter_fourcc(*&#x27;mp4v&#x27;)&#xA;                        # fourcc = cv2.VideoWriter_fourcc(*&#x27;mp3v&#x27;)&#xA;                        # fourcc = 0x00000021&#xA;                        print(fourcc, type(fourcc),&#x27;ffffffff&#x27;)&#xA;                        # a = int(vs.get(cv2.CAP_PROP_FOURCC))&#xA;                        # print(a,type(a),&#x27;  aaaaaaaa&#x27; )&#xA;&#xA;                        # writer = skvideo.io.FFmpegWriter(output_save_directory, outputdict={&#xA;                        #   &#x27;-vcodec&#x27;: &#x27;libx264&#x27;, &#x27;-b&#x27;: &#x27;300000000&#x27;&#xA;                        # })&#xA;                        &#xA;                        # writer = skvideo.io.FFmpegWriter(self.output_stream, outputdict={&#x27;-r&#x27;: &#x27;120&#x27;, &#x27;-c:v&#x27;: &#x27;libx264&#x27;, &#x27;-crf&#x27;: &#x27;0&#x27;, &#x27;-preset&#x27;: &#x27;ultrafast&#x27;, &#x27;-pix_fmt&#x27;: &#x27;yuv444p&#x27;})&#xA;                        &#xA;                        writer = cv2.VideoWriter(output_save_directory, fourcc ,20.0,( int(W), int(H) ), True)&#xA;                        &#xA;                        &#xA;                        # ~ The cv2.VideoWriter requires five parameters:    &#xA;&#xA;                    # check to see if we should write the frame to disk&#xA;                    if writer is not None:                          &#xA;                        try:&#xA;                            writer.write(frame)&#xA;                        except Exception as e:&#xA;                            print(&#x27;Error in writing video output---> &#x27;, e)&#xA;                            &#xA;                    #&lt;---------------------- end of  writing a video to disk ------------------------->&#xA;&#xA;                    # show the output frame&#xA;                    # cv2.imshow("Frame", frame)&#xA;                    # key = cv2.waitKey(1) &amp; 0xFF&#xA;&#xA;                    # if the `q` key was pressed, break from the loop&#xA;                    # if key == ord("q"):&#xA;                    #   break&#xA;&#xA;                    # increment the total number of frames processed thus far and&#xA;                    # then update the FPS counter&#xA;                    totalFrames &#x2B;= 1&#xA;                    fps.update()&#xA;                except Exception as e:&#xA;                    print(&#x27;Error in main while loop--> &#x27;, e)&#xA;&#xA;            # stop the timer and display FPS information&#xA;            fps.stop()&#xA;&#xA;            # check to see if we need to release the video writer pointer&#xA;            # if writer is not None:&#xA;            #   writer.release()&#xA;&#xA;            # if we are not using a video file, stop the camera video stream&#xA;            # if not self.input_stream:&#xA;            #   vs.stop()&#xA;&#xA;            # otherwise, release the video file pointer&#xA;            # else:&#xA;            #   vs.release()&#xA;&#xA;            # close any open windows&#xA;            # cv2.destroyAllWindows()&#xA;        except Exception as e:&#xA;            print(e, &#x27;333333333333333333333333333&#x27;)&#xA;

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    My Django template code

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    {% block main %}&#xA;<div class="row">&#xA;  {% if folders|length == 0 %}&#xA;    <div class="col-md-12 text-center">&#xA;      <h6 class="card-title">There are no files in this directory.</h6>&#xA;    </div>&#xA;  {% else %}&#xA;    {% for folder in folders %}&#xA;      <div class="col-md-3 text-center">&#xA;          <div class="card-block">&#xA;            <video class="video-js vjs-fluid vjs-default-skin" controls="controls" preload="auto" muted="muted" data-setup="&#x27;{" true="true"></video>&#xA;                <source src="{% get_media_prefix %}camera-feed/video-saved/{{pk}}/{{parent}}/{{folder}}" type="video/mp4">&#xA;            &#xA;            <h6 class="card-title">{{folder}}</h6>&#xA;          </source></div>&#xA;      </div>&#xA;    {% endfor %}&#xA;  {% endif %}&#xA;</div>&#xA;{% endblock %}&#xA;

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    Function in view.py to see saved .mp4 video in Django template. Video is saved at local folder.

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    def CameraVideos(request, pk, folder):&#xA;    dirpath = settings.MEDIA_ROOT &#x2B; &#x27;/camera-feed/video-saved/&#x27; &#x2B; str(pk) &#x2B; &#x27;/&#x27; &#x2B; folder&#xA;    folders = sorted(Path(dirpath).iterdir(), key=os.path.getmtime)&#xA;    data = []&#xA;    for file in folders:&#xA;        if not file.name.startswith(&#x27;.&#x27;):&#xA;            data.append(file.name)&#xA;    return render(request, "home/camera_video.html", {&#x27;folders&#x27;: data, &#x27;pk&#x27;: pk, &#x27;parent&#x27;: folder})&#xA;

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