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Sur d’autres sites (4431)

  • How can I concat several videos generated by MediaRecorder slices

    28 mai 2023, par Bruno Francisco

    I have the following frontend code :

    


    const mediaRecorder = new MediaRecorder(stream, {
        mimeType: 'video/webm'
    });

    mediaRecorder.start(10000);

    mediaRecorder.ondataavailable = (e) => {
        const formData = new FormData();

        formData.append('video', new Blob([e.data], { 'type' : 'video/webm;' }));

        fetch('http://localhost/api/session/12/video/stream', {
            method: 'POST',
            body: formData,
        }).then(() => {
            console.log('success')
        }).catch((e) => {
            console.log('error')
            console.log(e);
        });
    };


    


    Then, in the backend I'm saving the each 10 seconds video into a folder. Then, whenever the user finishes his session, we would like to stitch together all the videos together.

    


    If the user has recorded for 20 seconds, we will have 2 videos of 10 seconds.

    


    I have the following files in my folder :

    


    erKa3MVTuDfnuDUQUhUd2huUaCKfihtm8thc0KX0.bin
hAhJfVNxMEJK2MsyR99a7t7UkT3pjHkmdN1j2C9G.mkv


    


    I'm assuming that the first slice generated by MediaRecord includes the mime type, while the subsequent parts do not have mime types, generating a .bin file.

    


    Now, I run the following command to stitch all parts together :

    


    ffmpeg -i erKa3MVTuDfnuDUQUhUd2huUaCKfihtm8thc0KX0.bin -i hAhJfVNxMEJK2MsyR99a7t7UkT3pjHkmdN1j2C9G.mkv -filter_complex "concat=n=2:v=0:a=1" -vn -y final-video.mp4


    


    Then I get the following error :

    


    ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/aarch64-linux-gnu --incdir=/usr/include/aarch64-linux-gnu --arch=arm64 --enable-gpl --disable-stripping --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-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --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-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[h264 @ 0xaaaaf1ad3a70] non-existing PPS 0 referenced
    Last message repeated 1 times

...

Input #0, h264, from 'erKa3MVTuDfnuDUQUhUd2huUaCKfihtm8thc0KX0.bin':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: h264 (Baseline), yuv420p(tv, bt709, progressive), 1920x1080, 25 fps, 25 tbr, 1200k tbn, 50 tbc
Input #1, matroska,webm, from 'hAhJfVNxMEJK2MsyR99a7t7UkT3pjHkmdN1j2C9G.mkv':
  Metadata:
    encoder         : Chrome
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #1:0(eng): Video: h264 (Baseline), yuv420p(tv, bt709, progressive), 1920x1080, SAR 1:1 DAR 16:9, 29.33 fps, 29.33 tbr, 1k tbn, 2k tbc (default)
Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_concat_0


    


    Is there any way to stitch all files together ? Do I have to send the mime type on each time ondataavailable is called ?

    


  • FFMPEG Error : Padded dimensions smaller then input dimensions

    17 mai 2023, par Hekimen

    I have this ffmpeg command

    


    ffmpeg -i input.mp4 \
-vf "scale=80:45:force_original_aspect_ratio=decrease,pad=80:45:(ow-iw)/2:(oh-ih)/2:color=black,setsar=1,fps=1/5" \
-q:v 2 \
output/screenshot_%05d.jpg


    


    but it returns error :

    


    [Parsed_pad_1 @ 0x7f2014097f00] Padded dimensions cannot be smaller than input dimensions.
[Parsed_pad_1 @ 0x7f2014097f00] Failed to configure input pad on Parsed_pad_1
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!


    


    I tried command without pad filter and checked all screenshots, they are all generated with resolution 60x45. When i use same command but change scale and pad to 160x90 resolution it works without any error.

    


    I also checked ffmpeg manual for pad filter but i can't find anything helpful what should explain this error (https://ffmpeg.org/ffmpeg-filters.html#pad-1)

    


    How to make this command work ?

    


    I am using this ffmpeg version :

    


    ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.3.1 (Alpine 10.3.1_git20211027) 20211027
  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-libdav1d --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --enable-libsrt --enable-libssh --enable-libvidstab --disable-stripping --disable-static --disable-librtmp --enable-libaom --enable-libopus --enable-libsoxr --enable-libwebp --enable-vaapi --enable-vdpau --enable-vulkan --disable-debug
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100


    


  • ffmpeg add an audio to a video using apad, but duration not exactly same [closed]

    27 avril 2023, par Richard

    I am using ffmpeg to add an audio to a silent video, and the audio is shorter than the video, so I want to add silence to the end of the audio and make sure they have same duration. I use below command

    


    ffmpeg -i video.mp4 -i audio.mp3 -filter_complex "[1:0]apad" -c:v copy -shortest output.mp4


    


    but the output durations are not exactly the same

    


      

    1. Am I making any mistake here ?

      2. 


    2. Is there a way to make them exactly same ?

      3. 


    


    ffprobe -v error -show_entries stream=codec_type,duration,start_pts,start_time -sexagesimal output.mp4
[STREAM]
codec_type=audio
start_pts=0
start_time=0:00:00.000000
duration=0:00:03.621995
[/STREAM]
[STREAM]
codec_type=video
start_pts=0
start_time=0:00:00.000000
duration=0:00:03.640000
[/STREAM]


    


    input file info

    


    ▶ ffmpeg -i video.mp4                                                                                   
ffmpeg version 4.4-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.76.100
  Duration: 00:00:03.64, start: 0.000000, bitrate: 394 kb/s
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1080x1920, 390 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]


▶ ffmpeg  -i audio.mp3                                                                                     
ffmpeg version 4.4-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, mp3, from 'audio.mp3':
  Metadata:
    TCM             : A
    TT1             : xxx
    title           : yyy
    encoded_by      : ProTranscoderTool (Apple MP3 v1
  Duration: 00:00:02.77, start: 0.000000, bitrate: 271 kb/s
  Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 265 kb/s




    


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