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  • ffmpeg : Strange behaviour with fade-in and fade-out in conjunction vs successively

    29 novembre 2023, par CEr

    I have a video file I want to fade in and out over a duration of three seconds each.

    


    My code is :

    


    ffmpeg -i video.mp4 -vf "fade=t=in:st=0:d=3,fade=t=out:st=169.288000:d=3" videofaded.mp4

    


    Expected behaviour : Fade from and to black over 3s.
What I get : No fade in at all but a fade out as specified.

    


    If I run ffmpeg -i video.mp4 -vf "fade=t=in:st=0:d=3" -c:a copy fadein.mp4 to juste fade in everything works as expected.

    


    Can anybody help my identify the problem ? I want to fade in and out in the same turn as there are a couple of videos to edit.

    


    Thanks,
Chris

    


    Here is my ffmpeg output :

    


    ffmpeg version 4.2.7-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --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-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fffda8a7300] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 1920x1080, 1087 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '20231106_Einfuehrung_Word_Mark_Fragen.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:02:52.29, start: 0.016000, bitrate: 1126 kb/s
    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), none, 1920x1080, 1087 kb/s, 16 fps, 16 tbr, 10k tbn, 20k tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 16000 Hz, mono, fltp, 72 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
File 'videofaded.mp4' already exists. Overwrite ? [y/N] y
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 @ 0x7fffda8c2c40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x7fffda8c2c40] profile High, level 4.0
[libx264 @ 0x7fffda8c2c40] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=24 lookahead_threads=4 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=16 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 'videofaded.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
    Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080, q=-1--1, 16 fps, 16384 tbn, 16 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      encoder         : Lavc58.54.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 16000 Hz, mono, fltp, 69 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      encoder         : Lavc58.54.100 aac
frame= 2757 fps=273 q=-1.0 Lsize=   21394kB time=00:02:52.28 bitrate=1017.2kbits/s dup=92 drop=0 speed=17.1x
video:19842kB audio:1492kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.280957%
[libx264 @ 0x7fffda8c2c40] frame I:12    Avg QP:15.18  size:232156
[libx264 @ 0x7fffda8c2c40] frame P:1751  Avg QP:20.38  size:  9540
[libx264 @ 0x7fffda8c2c40] frame B:994   Avg QP:23.59  size:   832
[libx264 @ 0x7fffda8c2c40] consecutive B-frames: 40.7% 29.5% 13.1% 16.8%
[libx264 @ 0x7fffda8c2c40] mb I  I16..4: 44.5% 15.6% 39.9%
[libx264 @ 0x7fffda8c2c40] mb P  I16..4:  0.5%  0.2%  0.2%  P16..4:  9.3%  1.1%  1.0%  0.0%  0.0%    skip:87.8%
[libx264 @ 0x7fffda8c2c40] mb B  I16..4:  0.1%  0.1%  0.0%  B16..8:  6.2%  0.2%  0.1%  direct: 0.1%  skip:93.1%  L0:31.0% L1:66.2% BI: 2.9%
[libx264 @ 0x7fffda8c2c40] 8x8 transform intra:20.6% inter:17.2%
[libx264 @ 0x7fffda8c2c40] coded y,uvDC,uvAC intra: 40.5% 40.6% 18.4% inter: 3.2% 2.1% 0.3%
[libx264 @ 0x7fffda8c2c40] i16 v,h,dc,p: 40% 33%  8% 19%
[libx264 @ 0x7fffda8c2c40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 14% 43%  2%  1%  1%  1%  1%  2%
[libx264 @ 0x7fffda8c2c40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 37% 32% 15%  2%  3%  3%  3%  3%  3%
[libx264 @ 0x7fffda8c2c40] i8c dc,h,v,p: 56% 20% 19%  5%
[libx264 @ 0x7fffda8c2c40] Weighted P-Frames: Y:0.7% UV:0.7%
[libx264 @ 0x7fffda8c2c40] ref P L0: 85.4%  5.7%  6.2%  2.7%  0.0%
[libx264 @ 0x7fffda8c2c40] ref B L0: 79.1% 18.3%  2.6%
[libx264 @ 0x7fffda8c2c40] ref B L1: 96.6%  3.4%
[libx264 @ 0x7fffda8c2c40] kb/s:943.30
[aac @ 0x7fffda8f1e00] Qavg: 18927.953


    


  • Transcode webcam blob to RTMP using ffmpeg.wasm

    29 novembre 2023, par hassan moradnezhad

    I'm trying transcode webcam blob data to a rtmp server from browser by using ffmpeg.wasm .
    
first, i create a MediaStream.

    


            const stream = await navigator.mediaDevices.getUserMedia({
            video: true,
        });


    


    then, i create a MediaRecorder.

    


            const recorder = new MediaRecorder(stream, {mimeType: "video/webm; codecs:vp9"});
        recorder.ondataavailable = handleDataAvailable;
        recorder.start(0)


    


    when data is available, i call a function called handleDataAvailable.
    
here is the function.

    


        const handleDataAvailable = (event: BlobEvent) => {
        console.log("data-available");
        if (event.data.size > 0) {
            recordedChunksRef.current.push(event.data);
            transcode(event.data)
        }
    };


    


    in above code, i use another function which called transcode it's goal is going to send data to rtmp server using use ffmpeg.wasm.
    
here it is.

    


    const transcode = async (inputVideo: Blob | undefined) => {
        const ffmpeg = ffmpegRef.current;
        const fetchFileOutput = await fetchFile(inputVideo)
        ffmpeg?.writeFile('input.webm', fetchFileOutput)

        const data = await ffmpeg?.readFile('input.webm');
        if (videoRef.current) {
            videoRef.current.src =
                URL.createObjectURL(new Blob([(data as any)?.buffer], {type: 'video/webm'}));
        }

        // execute by node-media-server config 1
        await ffmpeg?.exec(['-re', '-i', 'input.webm', '-c', 'copy', '-f', 'flv', "rtmp://localhost:1935/live/ttt"])

        // execute by node-media-server config 2
        // await ffmpeg?.exec(['-re', '-i', 'input.webm', '-c:v', 'libx264', '-preset', 'veryfast', '-tune', 'zerolatency', '-c:a', 'aac', '-ar', '44100', '-f', 'flv', 'rtmp://localhost:1935/live/ttt']);

        // execute by stack-over-flow config 1
        // await ffmpeg?.exec(['-re', '-i', 'input.webm', '-c:v', 'h264', '-c:a', 'aac', '-f', 'flv', "rtmp://localhost:1935/live/ttt"]);

        // execute by stack-over-flow config 2
        // await ffmpeg?.exec(['-i', 'input.webm', '-c:v', 'libx264', '-flags:v', '+global_header', '-c:a', 'aac', '-ac', '2', '-f', 'flv', "rtmp://localhost:1935/live/ttt"]);

        // execute by stack-over-flow config 3
        // await ffmpeg?.exec(['-i', 'input.webm', '-acodec', 'aac', '-ac', '2', '-strict', 'experimental', '-ab', '160k', '-vcodec', 'libx264', '-preset', 'slow', '-profile:v', 'baseline', '-level', '30', '-maxrate', '10000000', '-bufsize', '10000000', '-b', '1000k', '-f', 'flv', 'rtmp://localhost:1935/live/ttt']);

    }


    


    after running app and start streaming, console logs are as below.

    


    ffmpeg >>>  ffmpeg version 5.1.3 Copyright (c) 2000-2022 the FFmpeg developers index.tsx:81:20
ffmpeg >>>    built with emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.40 (5c27e79dd0a9c4e27ef2326841698cdd4f6b5784) index.tsx:81:20
ffmpeg >>>    configuration: --target-os=none --arch=x86_32 --enable-cross-compile --disable-asm --disable-stripping --disable-programs --disable-doc --disable-debug --disable-runtime-cpudetect --disable-autodetect --nm=emnm --ar=emar --ranlib=emranlib --cc=emcc --cxx=em++ --objcc=emcc --dep-cc=emcc --extra-cflags='-I/opt/include -O3 -msimd128' --extra-cxxflags='-I/opt/include -O3 -msimd128' --disable-pthreads --disable-w32threads --disable-os2threads --enable-gpl --enable-libx264 --enable-libx265 --enable-libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libopus --enable-zlib --enable-libwebp --enable-libfreetype --enable-libfribidi --enable-libass --enable-libzimg index.tsx:81:20
ffmpeg >>>    libavutil      57. 28.100 / 57. 28.100 index.tsx:81:20
ffmpeg >>>    libavcodec     59. 37.100 / 59. 37.100 index.tsx:81:20
ffmpeg >>>    libavformat    59. 27.100 / 59. 27.100 index.tsx:81:20
ffmpeg >>>    libavdevice    59.  7.100 / 59.  7.100 index.tsx:81:20
ffmpeg >>>    libavfilter     8. 44.100 /  8. 44.100 index.tsx:81:20
ffmpeg >>>    libswscale      6.  7.100 /  6.  7.100 index.tsx:81:20
ffmpeg >>>    libswresample   4.  7.100 /  4.  7.100 index.tsx:81:20
ffmpeg >>>    libpostproc    56.  6.100 / 56.  6.100 index.tsx:81:20
ffmpeg >>>  Input #0, matroska,webm, from 'input.webm': index.tsx:81:20
ffmpeg >>>    Metadata: index.tsx:81:20
ffmpeg >>>      encoder         : QTmuxingAppLibWebM-0.0.1 index.tsx:81:20
ffmpeg >>>    Duration: N/A, start: 0.000000, bitrate: N/A index.tsx:81:20
ffmpeg >>>    Stream #0:0(eng): Video: vp8, yuv420p(progressive), 640x480, SAR 1:1 DAR 4:3, 15.50 tbr, 1k tbn (default)


    


    the problem is when ffmpeg.wasm try to execute the last command.
    
await ffmpeg?.exec(['-re', '-i', 'input.webm', '-c', 'copy', '-f', 'flv', "rtmp://localhost:1935/live/ttt"]).
    
it just calls a GET Request, I will send further details about this request.
    
as u can see, i try to use lots of arg sample with ffmpeg?.exec, but non of them works.

    


    the network tab in browser, after ffmpeg.wasm execute the command is as below.

    


    enter image description here

    


    it send a GET request to ws://localhost:1935/
and nothing happened after that.

    


    for backend, i use node-media-server and here is my output logs when ffmpeg.wasm trying to execute the args

    


    11/28/2023 19:33:18 55301 [INFO] [rtmp disconnect] id=JL569YOF
[NodeEvent on doneConnect] id=JL569YOF args=undefined


    


    at last here are my ques

    


    

      

    • how can i achive this option ?

      • 


    • is it possible to share webcam to rtmp server ?

      • 


    


    


  • ffmpeg errors when playing a playlist - Non monotonous DTS

    20 novembre 2023, par Evilmachine

    i have a strange bug in ffmpeg. I am using ffmpeg to stream Twitch VODs and CLIPs to a 24/7 twitch channel. If i stream the files one by one its working. If i am streaming a playlist containing vods and clips i get this error when the shorter clips are playing :

    


    [flv @ 0x555677050c60] Non-monotonous DTS in output stream 0:0; previous: 56867, current: 31846; changing to 56867. This may result in incorrect timestamps in the output file.

    


    and the video stops. Once the playlist has a longer vod again it is working.

    


    here is my code that i use to stream :

    


    while [ 1 -eq 1 ]
do
ffmpeg  -fflags +igndts -re -f concat -safe 0 -i playlist.txt -codec copy -flvflags no_duration_filesize -f flv rtmp://XXXXXXXXX
done


    


    If i look into ffprobe the files seems both to be normal :

    


    VODs

    


    ffprobe version 5.1.3-1+rpt4 Copyright (c) 2007-2022 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14)
  configuration: --prefix=/usr --extra-version=1+rpt4 --toolchain=hardened --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --disable-mmal --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sand --enable-sdl2 --disable-sndio --enable-libjxl --enable-neon --enable-v4l2-request --enable-libudev --enable-epoxy --libdir=/usr/lib/aarch64-linux-gnu --arch=arm64 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-vout-drm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e --enable-shared
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Speedrun - Goof Troop - Coop - @olli_wan und luk30994 -- Disney's Goof Troop.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2023-10-17T11:46:25.000000Z
  Duration: 00:28:23.02, start: 0.000000, bitrate: 1004 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 873 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
    Metadata:
      creation_time   : 2023-10-17T11:46:25.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/17/2023.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2023-10-17T11:46:25.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/17/2023.
      vendor_id       : [0][0][0][0]


    


    CLIPS

    


    ffprobe version 5.1.3-1+rpt4 Copyright (c) 2007-2022 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14)
  configuration: --prefix=/usr --extra-version=1+rpt4 --toolchain=hardened --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --disable-mmal --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sand --enable-sdl2 --disable-sndio --enable-libjxl --enable-neon --enable-v4l2-request --enable-libudev --enable-epoxy --libdir=/usr/lib/aarch64-linux-gnu --arch=arm64 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-vout-drm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e --enable-shared
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Clip -- Luk - Terra - Lebensweisheiten mit Lukas Thema Smart.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 00:00:05.00, start: 0.000000, bitrate: 5520 kb/s
  Stream #0:0[0x1](und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, unknown/bt709/unknown, progressive), 1280x720, 5374 kb/s, 60.20 fps, 60 tbr, 15360 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]


    


    Has someone a hint why this error happens and how i can avoid them ?
Is gstreamer better for this approach ?

    


    Thanks a lot in Advance.

    


    I tried changing the files.

    


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