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  • How to extract the first frame from a video ?

    10 août 2024, par Andrew

    I am trying to extract the first frame from a video to save it as a preview.

    


    Here's an almost working solution using ffmpeg :

    


    func extractFirstFrame(videoBytes []byte) ([]byte, error) {
    input := bytes.NewReader(videoBytes)

    var output bytes.Buffer

    err := ffmpeg.Input("pipe:0").
        Filter("select", ffmpeg.Args{"gte(n,1)"}).
        Output(
            "pipe:1",
            ffmpeg.KwArgs{
                "vframes": 1,
                "format":  "image2",
                "vcodec":  "mjpeg",
            }).
        WithInput(input).
        WithOutput(&output).
        Run()

    if err != nil {
        return nil, fmt.Errorf("error extracting frame: %v", err)
    }

    return output.Bytes(), nil
}


    


    The problem with this is that it can only process horizontal videos. For some reason it will throw a 0xbebbb1b7 error for a vertical videos. I don't understand why is that, probably because this is my very first time with ffmpeg.

    


    Also, I am concerned if this solution is optimal. My assumption is that the whole video will be loaded into the memory first, which is kinda bad and I would like to avoid that

    


    I use https://github.com/u2takey/ffmpeg-go, but errors are the same even if I run it using exec :

    


        cmd := exec.Command(
        "ffmpeg",
        "-i", "pipe:0",
        "-vf", "select=eq(n\\,0)",
        "-q:v", "3",
        "-f", "image2",
        "pipe:1",
    )


    


    Interestingly enough, I noticed that running command in the terminal will work as expected with any type of video ffmpeg -i .\video_2024-08-10_00-03-00.mp4 -vf "select=eq(n\,0)"  -q:v 3 output_image.jpg, so the problem may be on how I send those videos to my server. I useFiber and send videos as multipart/form-data and then read it like this :

    


        form_data, err := c.FormFile("image")
    file, err := form_data.Open()
    bytes, err := io.ReadAll(file)
    ....
    preview, err := extractFirstFrame(bytes)



    


    I also managed to find logs for the failed attempt :

    


    
ffmpeg version 7.0.2-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 13.2.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      59.  8.100 / 59.  8.100
  libavcodec     61.  3.100 / 61.  3.100
  libavformat    61.  1.100 / 61.  1.100
  libavdevice    61.  1.100 / 61.  1.100
  libavfilter    10.  1.100 / 10.  1.100
  libswscale      8.  1.100 /  8.  1.100
  libswresample   5.  1.100 /  5.  1.100
  libpostproc    58.  1.100 / 58.  1.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002a562ff0e80] stream 0, offset 0x30: partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002a562ff0e80] Could not find codec parameters for stream 1 (Video: h264 (avc1 / 0x31637661), none, 720x1280, 3093 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:0':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 2024-08-09T20:00:29.000000Z
  Duration: 00:00:06.80, start: 0.000000, bitrate: N/A
  Stream #0:0[0x1](eng): Audio: aac (mp4a / 0x6134706D), 22050 Hz, stereo, fltp, 74 kb/s (default)
      Metadata:
        creation_time   : 2024-08-09T20:00:23.000000Z
        handler_name    : SoundHandle
        vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Video: h264 (avc1 / 0x31637661), none, 720x1280, 3093 kb/s, 30 fps, 30 tbr, 90k tbn (default)
      Metadata:
        creation_time   : 2024-08-09T20:00:23.000000Z
        handler_name    : VideoHandle
        vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:1 -> #0:0 (h264 (native) -> mjpeg (native))
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002a562ff0e80] stream 1, offset 0x5d: partial file
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 000002a562fda2c0] Error during demuxing: Invalid data found when processing input
Cannot determine format of input 0:1 after EOF
[vf#0:0 @ 000002a5636c0ec0] Task finished with error code: -1094995529 (Invalid data found when processing input)
[vf#0:0 @ 000002a5636c0ec0] Terminating thread with return code -1094995529 (Invalid data found when processing input)
[vost#0:0/mjpeg @ 000002a5636c0400] Could not open encoder before EOF
[vost#0:0/mjpeg @ 000002a5636c0400] Task finished with error code: -22 (Invalid argument)
[vost#0:0/mjpeg @ 000002a5636c0400] Terminating thread with return code -22 (Invalid argument)
[out#0/image2 @ 000002a562ff5640] Nothing was written into output file, because at least one of its streams received no packets.
frame=    0 fps=0.0 q=0.0 Lsize=       0KiB time=N/A bitrate=N/A speed=N/A
Conversion failed!


    


    Logs for the same video, but ran via terminal :

    


    ffmpeg version 7.0.2-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 13.2.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      59.  8.100 / 59.  8.100
  libavcodec     61.  3.100 / 61.  3.100
  libavformat    61.  1.100 / 61.  1.100
  libavdevice    61.  1.100 / 61.  1.100
  libavfilter    10.  1.100 / 10.  1.100
  libswscale      8.  1.100 /  8.  1.100
  libswresample   5.  1.100 /  5.  1.100
  libpostproc    58.  1.100 / 58.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\video_2024-08-10_00-03-00.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 2024-08-09T20:00:29.000000Z
  Duration: 00:00:06.80, start: 0.000000, bitrate: 3175 kb/s
  Stream #0:0[0x1](eng): Audio: aac (HE-AAC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 74 kb/s (default)
      Metadata:
        creation_time   : 2024-08-09T20:00:23.000000Z
        handler_name    : SoundHandle
        vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 720x1280, 3093 kb/s, 30 fps, 30 tbr, 90k tbn (default)
      Metadata:
        creation_time   : 2024-08-09T20:00:23.000000Z
        handler_name    : VideoHandle
        vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:1 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 00000219eb4d0c00] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'output_image.jpg':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf61.1.100
  Stream #0:0(eng): Video: mjpeg, yuvj420p(pc, unknown/bt709/bt709, progressive), 720x1280, q=2-31, 200 kb/s, 30 fps, 30 tbn (default)
      Metadata:
        creation_time   : 2024-08-09T20:00:23.000000Z
        handler_name    : VideoHandle
        vendor_id       : [0][0][0][0]
        encoder         : Lavc61.3.100 mjpeg
      Side data:
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
[image2 @ 00000219e7aa51c0] The specified filename 'output_image.jpg' does not contain an image sequence pattern or a pattern is invalid.
[image2 @ 00000219e7aa51c0] Use a pattern such as %03d for an image sequence or use the -update option (with -frames:v 1 if needed) to write a single image.
[out#0/image2 @ 00000219e7b5e400] video:49KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
frame=    1 fps=0.0 q=3.0 Lsize=N/A time=00:00:00.03 bitrate=N/A speed=0.322x


    


    I also realized that the problem was not related to the video orientation, but to to the video from a specific source uploaded specifically on my server 🤡 Such a weird coincidence that I decided to test my video upload with those files, but anyway. And those are.... Downloaded instagram reels lol. But again, ffmpeg works just fine when ran in terminal

    


  • first audio lost when using ffmpeg to overlay one mp4 on top of a big mp4

    11 septembre 2024, par James Hao

    I searched a lot (including chatgtp and google), and tried a lot of methods, not work.
below is my ffmpeg command line on windows 10 :

    


    ffmpeg -i video.mp4 -i b-.mp4 -filter_complex "[0:v]setpts=PTS-STARTPTS[b1];[1:v]scale=300:-1,setpts=PTS-STARTPTS+0.0/TB[top];[b1][top]overlay=x=50:y=50:enable='between(t\,0.0,5)'[outv];[1:a]adelay=0|0[a1]; [0:a][a1]amerge=inputs=2[outa]" -map "[outv]" -map "[outa]" -pix_fmt yuv420p -c:a aac -ac 2 -c:v libx264 -crf 18 final_video6.mp4


    


    two mp4 files, b-.mp4 should be on top of video.mp4 and play from 0th second and scale to 300 :-1, [0:a][a1]amerge is to merge two audio from the mp4 files, using "-ac 2" to replace pan statement according to enter link description here

    


    in result mp4 file, the audio from video.mp4 is lost ; sometimes with the same instruction, but replace b-.mp4 with another mp4 file, the audio may partially lost. any help will be very appreciated.
below is the console output from ffmpeg :

    


    ffmpeg version 7.0.1-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 13.2.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      59.  8.100 / 59.  8.100
  libavcodec     61.  3.100 / 61.  3.100
  libavformat    61.  1.100 / 61.  1.100
  libavdevice    61.  1.100 / 61.  1.100
  libavfilter    10.  1.100 / 10.  1.100
  libswscale      8.  1.100 /  8.  1.100
  libswresample   5.  1.100 /  5.  1.100
  libpostproc    58.  1.100 / 58.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf61.1.100
  Duration: 00:00:09.40, start: 0.000000, bitrate: 72 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 854x480, 21 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
      Metadata:
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
        encoder         : Lavc61.3.100 libx264
  Stream #0:1[0x2](und): Audio: mp3 (mp3float) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 47 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'b-.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.27.100
  Duration: 00:00:05.29, start: 0.030000, bitrate: 325 kb/s
  Stream #1:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 366x132, 196 kb/s, 25.15 fps, 50 tbr, 90k tbn (default)
      Metadata:
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
  Stream #1:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 139 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 (h264) -> setpts:default
  Stream #0:1 (mp3float) -> amerge
  Stream #1:0 (h264) -> scale:default
  Stream #1:1 (aac) -> adelay:default
  overlay:default -> Stream #0:0 (libx264)
  amerge:default -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[Parsed_amerge_5 @ 000002a6613bf100] No channel layout for input 1
[vost#0:0/libx264 @ 000002a6612936c0] No information about the input framerate is available. Falling back to a default value of 25fps. Use the -r option if you want a different framerate.
[libx264 @ 000002a6612b8f40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000002a6612b8f40] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 000002a6612b8f40] 264 - core 164 r3191 4613ac3 - H.264/MPEG-4 AVC codec - Copyleft 2003-2024 - 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=15 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=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'final_video6.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf61.1.100
  Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(progressive), 854x480, q=2-31, 25 fps, 12800 tbn
      Metadata:
        encoder         : Lavc61.3.100 libx264
      Side data:
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
      Metadata:
        encoder         : Lavc61.3.100 aac
[out#0/mp4 @ 000002a66105e640] video:93KiB audio:78KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 3.974328%
frame=  236 fps=0.0 q=-1.0 Lsize=     178KiB time=00:00:04.97 bitrate= 292.5kbits/s dup=0 drop=46 speed=16.9x
[libx264 @ 000002a6612b8f40] frame I:2     Avg QP: 4.89  size:  4803
[libx264 @ 000002a6612b8f40] frame P:63    Avg QP:14.43  size:   854
[libx264 @ 000002a6612b8f40] frame B:171   Avg QP:12.25  size:   181
[libx264 @ 000002a6612b8f40] consecutive B-frames:  2.1%  1.7%  6.4% 89.8%
[libx264 @ 000002a6612b8f40] mb I  I16..4: 86.1% 10.0%  3.8%
[libx264 @ 000002a6612b8f40] mb P  I16..4:  0.3%  0.1%  0.3%  P16..4:  1.4%  0.6%  0.1%  0.0%  0.0%    skip:97.1%
[libx264 @ 000002a6612b8f40] mb B  I16..4:  0.0%  0.0%  0.1%  B16..8:  1.4%  0.3%  0.0%  direct: 0.0%  skip:98.1%  L0:52.4% L1:39.0% BI: 8.6%
[libx264 @ 000002a6612b8f40] 8x8 transform intra:11.2% inter:13.3%
[libx264 @ 000002a6612b8f40] coded y,uvDC,uvAC intra: 11.2% 12.4% 12.0% inter: 0.2% 0.2% 0.1%
[libx264 @ 000002a6612b8f40] i16 v,h,dc,p: 90%  6%  4%  0%
[libx264 @ 000002a6612b8f40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28%  3% 67%  0%  0%  0%  0%  0%  1%
[libx264 @ 000002a6612b8f40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 35% 15%  3%  4%  4%  5%  3%  4%
[libx264 @ 000002a6612b8f40] i8c dc,h,v,p: 86% 10%  3%  0%
[libx264 @ 000002a6612b8f40] Weighted P-Frames: Y:1.6% UV:1.6%
[libx264 @ 000002a6612b8f40] ref P L0: 69.2%  3.3% 18.7%  8.8%
[libx264 @ 000002a6612b8f40] ref B L0: 64.6% 31.0%  4.3%
[libx264 @ 000002a6612b8f40] ref B L1: 94.4%  5.6%
[libx264 @ 000002a6612b8f40] kb/s:80.06
[aac @ 000002a6612d0fc0] Qavg: 498.856


    


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