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  • FFmpeg stdout emits more frames than it should

    29 décembre 2022, par distante

    I am running this command to get two images per second from an rtsp stream :

    


    const ffmpeg = spawn(this.ffmpeg, [
      // Set the frame rate of the input video to 2 frames per second
      '-r',
      '2',
      // Specify that the RTSP stream should use TCP as the transport protocol
      '-rtsp_transport',
      'tcp',
      // Set the input source to the RTSP stream specified by the `rtspUrl` variable
      '-i',
      rtspUrl,
      // Set the video filter to only output two frames per second (final video)
      '-vf',
      'fps=2',
      // Set the output format to "image2pipe," which specifies that the output should be written to stdout as a series of images in a pipe
      '-f',
      'image2pipe',
      // Overwrite any existing output file without prompting for confirmation
      '-y',
      // Set the output destination to stdout
      '-',
    ]);



    


    I am subscribing to the stdout and saving each emit into a file (just for testing, I need to process the data later)

    


        let i = 0;
    from(ffmpeg.stdout)
      .pipe(
        concatMap((data) => {
          i++
          return writeFile(`file_${i}`, data).then(() => i);
        }),
      )
      .subscribe((i) => {
        this.imageLogger.log(`file_${i} saved`);
      });


    


    The thing is, I am getting a lot more than 2 images per second :

    


    i       | [Nest] 431  - 12/28/2022, 1:16:09 PM     LOG [Image Logger] stderr: ffmpeg version 5.0.1-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2022 the FFmpeg developers
api       |   built with gcc 8 (Debian 8.3.0-6)
api       |   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
api       |   libavutil      57. 17.100 / 57. 17.100
api       |   libavcodec     59. 18.100 / 59. 18.100
api       |   libavformat    59. 16.100 / 59. 16.100
api       |   libavdevice    59.  4.100 / 59.  4.100
api       |   libavfilter     8. 24.100 /  8. 24.100
api       |   libswscale      6.  4.100 /  6.  4.100
api       |   libswresample   4.  3.100 /  4.  3.100
api       |   libpostproc    56.  3.100 / 56.  3.100
api       |   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
api       |   libavutil      57. 17.100 / 57. 17.100
api       |   libavcodec     59. 18.100 / 59. 18.100
api       |   libavformat    59. 16.100 / 59. 16.100
api       |   libavdevice    59.  4.100 / 59.  4.100
api       |   libavfilter     8. 24.100 /  8. 24.100
api       |   libswscale      6.  4.100 /  6.  4.100
api       |   libswresample   4.  3.100 /  4.  3.100
api       |   libpostproc    56.  3.100 / 56.  3.100
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] stderr: Guessed Channel Layout for Input Stream #0.1 : mono
api       | Input #0, rtsp, from 'rtsp://user:password@192.68.45.54:554/stream2':
api       |   Metadata:
api       |     title           : Session streamed by "TP-LINK RTSP Server"
api       |     comment         : stream2
api       |   Duration: N/A, start: 0.000000, bitrate: N/A
api       |   Stream #0:0: Video: h264 (High), yuvj420p(pc, bt709, progressive), 640x360, 15 fps, 28.58 tbr, 90k tbn
api       |   Stream #0:1: Audio: pcm_alaw, 8000 Hz, mono, s16, 64 kb/s
api       |
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] stderr: Stream mapping:
api       |   Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
api       | Press [q] to stop, [?] for help
api       |
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] stderr: Output #0, image2pipe, to 'pipe:':
api       |   Metadata:
api       |     title           : Session streamed by "TP-LINK RTSP Server"
api       |     comment         : stream2
api       |     encoder         : Lavf59.16.100
api       |   Stream #0:0: Video: mjpeg, yuvj420p(pc, bt709, progressive), 640x360, q=2-31, 200 kb/s, 2 fps, 2 tbn
api       |
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] stderr:     Metadata:
api       |       encoder         : Lavc59.18.100 mjpeg
api       |     Side data:
api       |       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] stderr: frame=    1 fps=0.0 q=5.0 size=      23kB time=00:00:00.50 bitrate= 383.9kbits/s speed=59.4x
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_1.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_2.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_3.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_4.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_5.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_6.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_7.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_8.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_9.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_10.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_11.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_12.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_13.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_14.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_15.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_16.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_17.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_18.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_19.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_20.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_21.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_22.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_23.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_24.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_25.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_26.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] stderr: frame=   27 fps=0.0 q=16.0 size=     559kB time=00:00:13.50 bitrate= 339.3kbits/s speed=25.3x
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_27.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_28.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_29.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_30.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_31.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:12 PM     LOG [Image Logger] file_32.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_33.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] stderr: frame=   34 fps= 33 q=16.6 size=     632kB time=00:00:17.00 bitrate= 304.6kbits/s speed=16.3x
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_34.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_35.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_36.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_37.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_38.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_39.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_40.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_41.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] stderr: frame=   41 fps= 26 q=16.5 size=     705kB time=00:00:20.50 bitrate= 281.7kbits/s speed=13.2x
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_42.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_43.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_44.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_45.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:13 PM     LOG [Image Logger] file_46.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_47.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_48.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] stderr: frame=   48 fps= 23 q=16.4 size=     779kB time=00:00:24.00 bitrate= 265.9kbits/s speed=11.6x
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_49.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_50.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_51.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_52.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_53.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_54.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_55.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] stderr: frame=   56 fps= 22 q=16.1 size=     865kB time=00:00:28.00 bitrate= 253.0kbits/s speed=10.9x
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_56.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_57.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_58.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_59.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:14 PM     LOG [Image Logger] file_60.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_61.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_62.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_63.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] stderr: frame=   63 fps= 20 q=15.5 size=     939kB time=00:00:31.50 bitrate= 244.3kbits/s speed=10.2x
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_64.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_65.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_66.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_67.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_68.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_69.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_70.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] stderr: frame=   70 fps= 19 q=15.4 size=    1017kB time=00:00:35.00 bitrate= 238.0kbits/s speed= 9.7x
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_71.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_72.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_73.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_74.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:15 PM     LOG [Image Logger] file_75.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:16 PM     LOG [Image Logger] file_76.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:16 PM     LOG [Image Logger] file_77.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:16 PM     LOG [Image Logger] stderr: frame=   78 fps= 19 q=15.1 size=    1106kB time=00:00:39.00 bitrate= 232.4kbits/s speed=9.48x
api       | [Nest] 431  - 12/28/2022, 1:16:16 PM     LOG [Image Logger] file_78.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:16 PM     LOG [Image Logger] file_79.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:16 PM     LOG [Image Logger] file_80.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:16 PM     LOG [Image Logger] file_81.jpg saved
api       | [Nest] 431  - 12/28/2022, 1:16:16 PM     LOG [Image Logger] file_82.jpg saved


    


    Am I missing some part ? why I do not only get 2 stdout events pro second ?

    


    Edit :

    


    ffmpeg version 5.0.1-static
node : 18.12.1

    


    Edit 2 :

    


    When I run this command on the terminal :

    


    ffmpeg -r 2 -rtsp_transport tcp -i "rtsp://user:password@192.68.45.54:554/stream2" -vf fps=2 -timecode 00:00:00:00 test.mp4


    


    The generated video has a frame rate of 2 but it looks like it is in slow motion. Since the source video has also a timer, I see how it takes something like 12 "frames" to go from one second to another.

    


    This is the output :

    


    fmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 14.0.0 (clang-1400.0.29.202)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.2_1 --enable-shared --enable-pthreads --enable-version3 --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-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --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-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  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, rtsp, from 'rtsp://user:password@192.68.45.54:554/stream2':
  Metadata:
    title           : Session streamed by "TP-LINK RTSP Server"
    comment         : stream2
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: h264 (High), yuvj420p(pc, bt709, progressive), 640x360, 15 fps, 28.58 tbr, 90k tbn
  Stream #0:1: Audio: pcm_alaw, 8000 Hz, mono, s16, 64 kb/s
File 'test.mp4' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (pcm_alaw (native) -> aac (native))
Press [q] to stop, [?] for help
[aac @ 0x7fa79fb061c0] Too many bits 8832.000000 > 6144 per frame requested, clamping to max
[libx264 @ 0x7fa79fb04e00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7fa79fb04e00] profile High, level 2.2, 4:2:0, 8-bit
[libx264 @ 0x7fa79fb04e00] 264 - core 164 r3095 baee400 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - 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=11 lookahead_threads=1 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=2 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
[mp4 @ 0x7fa78f104780] Using non-standard frame rate 2/1
    Last message repeated 1 times
Output #0, mp4, to 'test.mp4':
  Metadata:
    title           : Session streamed by "TP-LINK RTSP Server"
    comment         : stream2
    timecode        : 00:00:00:00
    encoder         : Lavf59.27.100
  Stream #0:0: Video: h264 (avc1 / 0x31637661), yuvj420p(pc, bt709, progressive), 640x360, q=2-31, 2 fps, 16384 tbn
    Metadata:
      encoder         : Lavc59.37.100 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), 8000 Hz, mono, fltp, 48 kb/s
    Metadata:
      encoder         : Lavc59.37.100 aac
frame=  186 fps= 28 q=20.0 size=     256kB time=00:01:04.00 bitrate=  32.8kbits/s speed=9.58x

[q] command received. Exiting.

frame=  190 fps= 27 q=-1.0 Lsize=     749kB time=00:01:33.50 bitrate=  65.6kbits/s speed=13.2x
video:708kB audio:35kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.836704%
[libx264 @ 0x7fa79fb04e00] frame I:1     Avg QP:10.13  size: 45352
[libx264 @ 0x7fa79fb04e00] frame P:74    Avg QP:12.27  size:  7161
[libx264 @ 0x7fa79fb04e00] frame B:115   Avg QP:22.28  size:  1294
[libx264 @ 0x7fa79fb04e00] consecutive B-frames: 14.7%  9.5% 12.6% 63.2%
[libx264 @ 0x7fa79fb04e00] mb I  I16..4: 15.0% 14.0% 71.0%
[libx264 @ 0x7fa79fb04e00] mb P  I16..4:  0.6%  1.5%  2.4%  P16..4: 20.4%  4.9%  5.9%  0.0%  0.0%    skip:64.3%
[libx264 @ 0x7fa79fb04e00] mb B  I16..4:  0.0%  0.1%  0.3%  B16..8: 15.9%  2.4%  1.5%  direct: 0.9%  skip:78.9%  L0:45.5% L1:48.6% BI: 5.9%
[libx264 @ 0x7fa79fb04e00] 8x8 transform intra:27.4% inter:64.7%
[libx264 @ 0x7fa79fb04e00] coded y,uvDC,uvAC intra: 81.7% 60.2% 46.5% inter: 9.4% 4.2% 1.5%
[libx264 @ 0x7fa79fb04e00] i16 v,h,dc,p: 44% 10% 19% 27%
[libx264 @ 0x7fa79fb04e00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 52% 14% 13%  3%  2%  3%  3%  5%  4%
[libx264 @ 0x7fa79fb04e00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 18% 13%  6%  5%  6%  5%  6%  7%
[libx264 @ 0x7fa79fb04e00] i8c dc,h,v,p: 45% 18% 27%  9%
[libx264 @ 0x7fa79fb04e00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7fa79fb04e00] ref P L0: 78.9%  7.6% 11.4%  2.1%
[libx264 @ 0x7fa79fb04e00] ref B L0: 90.8%  8.0%  1.2%
[libx264 @ 0x7fa79fb04e00] ref B L1: 97.0%  3.0%
[libx264 @ 0x7fa79fb04e00] kb/s:60.98
[aac @ 0x7fa79fb061c0] Qavg: 64944.246


    


  • Why does ffmpeg keep using more and more RAM and crash ?

    29 décembre 2022, par József Márton Kakas

    I am using the following command with ffmpeg to encode a video file using the libsvtav1 codec : ffmpeg -i hevc.mkv -map 0:v:0 -c:v:0 libsvtav1 -preset 8 -crf 22 -format matroska av1.mkv.

    


    However, ffmpeg is using up all of my available RAM and crashing. I have also tried using the libx264 codec, but the same issue occurs, although it happens more slowly. I have already allocated 12 GB of RAM to ffmpeg, but it still seems to be insufficient. How can I prevent ffmpeg from using all of my available RAM and crashing when using either the libsvtav1 or libx264 codecs ?

    


    I have tried it on another VM, but the same issue occurs. Here is the full output of the program.

    


    ffmpeg -i akira.mkv -map 0:v:0 -c:v:0 libsvtav1 -preset 8 -crf 22 -c:a copy -c:s copy -format matroska av1.mkv
ffmpeg version n5.1.2-7-ga6e26053c2-20221106 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.2.0 (crosstool-NG 1.25.0.90_cf9beb1)
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-ffbuild-linux-gnu- --arch=x86_64 --target-os=linux --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --enable-libpulse --enable-libvmaf --enable-libxcb --enable-xlib --enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth --disable-chromaprint --enable-libdav1d --enable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar --enable-libass --enable-libbluray --enable-libjxl --enable-libmp3lame --enable-libopus --enable-mbedtls --enable-librist --enable-libssh --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libmfx --disable-openal --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable-librubberband --disable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --enable-libdrm --enable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc --enable-libplacebo --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags=-pie --extra-libs='-ldl -lgomp' --extra-version=20221106
  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, matroska,webm, from 'akira.mkv':
  Metadata:
    title           : Akira 4K
    encoder         : libebml v1.3.10 + libmatroska v1.5.2
    creation_time   : 2020-05-04T19:57:18.000000Z
  Duration: 02:04:46.50, start: 0.000000, bitrate: 10945 kb/s
  Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2074 [SAR 1:1 DAR 1920:1037], 23.98 fps, 23.98 tbr, 1k tbn (default)
    Metadata:
      BPS-eng         : 9531297
      DURATION-eng    : 02:04:46.479000000
      NUMBER_OF_FRAMES-eng: 179496
      NUMBER_OF_BYTES-eng: 8919482644
      _STATISTICS_WRITING_APP-eng: mkvmerge v43.0.0 ('The Quartermaster') 32-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-05-04 19:57:18
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1(eng): Subtitle: subrip
    Metadata:
      BPS-eng         : 46
      DURATION-eng    : 01:59:00.755000000
      NUMBER_OF_FRAMES-eng: 1277
      NUMBER_OF_BYTES-eng: 41675
      _STATISTICS_WRITING_APP-eng: mkvmerge v43.0.0 ('The Quartermaster') 32-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-05-04 19:57:18
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:2(ita): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s (default)
    Metadata:
      title           : Nuovo doppiaggio
      BPS-eng         : 448000
      DURATION-eng    : 02:04:28.480000000
      NUMBER_OF_FRAMES-eng: 233390
      NUMBER_OF_BYTES-eng: 418234880
      _STATISTICS_WRITING_APP-eng: mkvmerge v43.0.0 ('The Quartermaster') 32-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-05-04 19:57:18
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:3(ita): Audio: ac3, 48000 Hz, stereo, fltp, 448 kb/s
    Metadata:
      title           : Doppiaggio Storico
      BPS-eng         : 448000
      DURATION-eng    : 02:04:28.480000000
      NUMBER_OF_FRAMES-eng: 233390
      NUMBER_OF_BYTES-eng: 418234880
      _STATISTICS_WRITING_APP-eng: mkvmerge v43.0.0 ('The Quartermaster') 32-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-05-04 19:57:18
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:4(ita): Subtitle: dvd_subtitle, 1920x1080
    Metadata:
      title           : Italiano
      BPS-eng         : 8426
      DURATION-eng    : 02:00:14.955000000
      NUMBER_OF_FRAMES-eng: 1201
      NUMBER_OF_BYTES-eng: 7599491
      _STATISTICS_WRITING_APP-eng: mkvmerge v43.0.0 ('The Quartermaster') 32-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-05-04 19:57:18
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:5(ita): Subtitle: subrip (default)
    Metadata:
      title           : Forced
      BPS-eng         : 0
      DURATION-eng    : 01:46:31.753000000
      NUMBER_OF_FRAMES-eng: 14
      NUMBER_OF_BYTES-eng: 462
      _STATISTICS_WRITING_APP-eng: mkvmerge v43.0.0 ('The Quartermaster') 32-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-05-04 19:57:18
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:6(jpn): Audio: eac3, 48000 Hz, 5.1(side), fltp, 256 kb/s
    Metadata:
      BPS-eng         : 256000
      DURATION-eng    : 02:04:46.496000000
      NUMBER_OF_FRAMES-eng: 233953
      NUMBER_OF_BYTES-eng: 239567872
      _STATISTICS_WRITING_APP-eng: mkvmerge v43.0.0 ('The Quartermaster') 32-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-05-04 19:57:18
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:7(eng): Audio: eac3, 48000 Hz, 5.1(side), fltp, 256 kb/s
    Metadata:
      BPS-eng         : 256000
      DURATION-eng    : 02:04:46.496000000
      NUMBER_OF_FRAMES-eng: 233953
      NUMBER_OF_BYTES-eng: 239567872
      _STATISTICS_WRITING_APP-eng: mkvmerge v43.0.0 ('The Quartermaster') 32-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-05-04 19:57:18
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:8: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 1067x600, 90k tbr, 90k tbn (attached pic)
    Metadata:
      filename        : cover_land.jpg
      mimetype        : image/jpeg
  Stream #0:9: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 120x176, 90k tbr, 90k tbn (attached pic)
    Metadata:
      filename        : small_cover.jpg
      mimetype        : image/jpeg
  Stream #0:10: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 213x120, 90k tbr, 90k tbn (attached pic)
    Metadata:
      filename        : small_cover_land.jpg
      mimetype        : image/jpeg
  Stream #0:11: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 600x882, 90k tbr, 90k tbn (attached pic)
    Metadata:
      filename        : cover.jpg
      mimetype        : image/jpeg
  Stream #0:12: Attachment: otf
    Metadata:
      filename        : StoneSansStd-Semibold.otf
      mimetype        : application/vnd.ms-opentype
  Stream #0:13: Attachment: otf
    Metadata:
      filename        : StoneSansStd-SemiboldItalic.otf
      mimetype        : application/vnd.ms-opentype
  Stream #0:14: Attachment: otf
    Metadata:
      filename        : ATPacella-Black.otf
      mimetype        : application/vnd.ms-opentype
  Stream #0:15: Attachment: ttf
    Metadata:
      filename        : ITC Franklin Gothic LT Medium Condensed.ttf
      mimetype        : application/x-truetype-font
File 'av1.mkv' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> av1 (libsvtav1))
Press [q] to stop, [?] for help
Svt[info]: -------------------------------------------
Svt[info]: SVT [version]:       SVT-AV1 Encoder Lib v1.3.0
Svt[info]: SVT [build]  :       GCC 12.2.0       64 bit
Svt[info]: LIB Build date: Nov  6 2022 00:41:54
Svt[info]: -------------------------------------------
Svt[info]: Number of logical cores available: 16
Svt[info]: Number of PPCS 71
Svt[info]: [asm level on system : up to avx]
Svt[info]: [asm level selected : up to avx]
Svt[info]: -------------------------------------------
Svt[info]: SVT [config]: main profile   tier (auto)     level (auto)
Svt[info]: SVT [config]: width / height / fps numerator / fps denominator               : 3840 / 2080 / 24000 / 1001
Svt[info]: SVT [config]: bit-depth / color format                      : 10 / YUV420
Svt[info]: SVT [config]: preset / tune / pred struct                   : 8 / PSNR / random access
Svt[info]: SVT [config]: gop size / mini-gop size / key-frame type     : 161 / 16 / key frame
Svt[info]: SVT [config]: BRC mode / rate factor                        : CRF / 22 
Svt[info]: -------------------------------------------
Output #0, matroska, to 'av1.mkv':
  Metadata:
    title           : Akira 4K
    encoder         : Lavf59.27.100
  Stream #0:0: Video: av1 (AV01 / 0x31305641), yuv420p10le(tv, bt2020nc/bt2020/smpte2084, progressive), 3840x2074 [SAR 1:1 DAR 1920:1037], q=2-31, 23.98 fps, 1k tbn (default)
    Metadata:
      BPS-eng         : 9531297
      DURATION-eng    : 02:04:46.479000000
      NUMBER_OF_FRAMES-eng: 179496
      NUMBER_OF_BYTES-eng: 8919482644
      _STATISTICS_WRITING_APP-eng: mkvmerge v43.0.0 ('The Quartermaster') 32-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-05-04 19:57:18
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      encoder         : Lavc59.37.100 libsvtav1
frame=    1 fps=0.0 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A sframe=    2 fps=1.3 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A sframe=   51 fps= 25 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A sframe=   73 fps= 16 q=16.0 size=       1kB time=00:00:00.00 bitrate=7480frame=   76 fps= 14 q=16.0 size=       1kB time=00:00:00.00 bitrate=7480frame=   81 fps= 14 q=16.0 size=       1kB time=00:00:00.00 bitrate=7480frame=   87 fps= 14 q=21.0 size=       1kB time=00:00:00.16 bitrate=  44frame=   95 fps= 14 q=21.0 size=       1kB time=00:00:00.50 bitrate=  14frame=  100 fps= 13 q=16.0 size=       1kB time=00:00:00.66 bitrate=  11frame=  110 fps= 13 q=23.0 size=       1kB time=00:00:00.96 bitrate=   7frame=  114 fps= 13 q=23.0 size=       1kB time=00:00:01.12 bitrate=   6frame=  122 fps= 13 q=23.0 size=       1kB time=00:00:01.46 bitrate=   5frame=  126 fps= 12 q=23.0 size=       1kB time=00:00:01.62 bitrate=   4frame=  133 fps= 12 q=22.0 size=       1kB time=00:00:01.92 bitrate=   3frame=  139 fps= 12 q=21.0 size=       1kB time=00:00:02.17 bitrate=   3frame=  141 fps= 11 q=22.0 size=       1kB time=00:00:02.25 bitrate=   3frame=  144 fps= 11 q=23.0 size=       1kB time=00:00:02.37 bitrate=   3frame=  151 fps= 11 q=13.0 size=       1kB time=00:00:02.67 bitrate=   2frame=  159 fps= 11 q=18.0 size=       1kB time=00:00:03.00 bitrate=   2frame=  164 fps= 11 q=22.0 size=       1kB time=00:00:03.21 bitrate=   2frame=  174 fps= 11 q=22.0 size=       1kB time=00:00:03.63 bitrate=   2frame=  179 fps= 11 q=20.0 size=       1kB time=00:00:03.83 bitrate=   1frame=  187 fps= 11 q=20.0 size=       1kB time=00:00:04.17 bitrate=   1frame=  189 fps= 10 q=21.0 size=       1kB time=00:00:04.25 bitrate=   1frame=  192 fps= 10 q=22.0 size=       1kB time=00:00:04.38 bitrate=   1frame=  195 fps=8.0 q=20.0 size=       1kB time=00:00:04.50 bitrate=   1frame=  201 fps=8.0 q=11.0 size=       1kB time=00:00:04.67 bitrate=   1Killeds/s speed=0.187x


    


  • HOW TO APPLY TRANSITION EFFECTS IN FFMPEG ? [closed]

    8 janvier 2023, par SMART

    I have 7 videos with audio, i tried to apply transition effects on these files, written code in python for this , i got error .

    


    python code :
import subprocess as sp

    


        def runffmpeg(cmd):
        try:
            pipe = sp.Popen(cmd, stdout=sp.PIPE, stderr=sp.STDOUT,
                            universal_newlines=True)
    
            ffmpeg_output, _ = pipe.communicate()
    
            print(ffmpeg_output)
            return (ffmpeg_output)
    
        except sp.CalledProcessError as err:
            print("FFmpeg stdout output on error:\n" + err.output)
    
    def get_duration(fn):
        cmd = (
            f"ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 {fn}")
    
        cmd1 = (
            f"ffprobe -v error -of flat=s_ -select_streams 1 -show_entries stream=duration -of default=noprint_wrappers=1:nokey=1 {fn}")
        try:
            pipe = sp.Popen(cmd, stdout=sp.PIPE, stderr=sp.STDOUT,
                            universal_newlines=True)
    
            viddur, _ = pipe.communicate()
    
            print(viddur)
    
            pipe = sp.Popen(cmd1, stdout=sp.PIPE, stderr=sp.STDOUT,
                            universal_newlines=True)
    
            auddur, _ = pipe.communicate()
    
            try:
                auddur = float(auddur.strip())
            except:
                auddur = 0
    
            print(auddur)
    
            # if (len(auddur) == 0):
            #     auddur = 0
    
            return float(viddur.strip()), (auddur)
    
        except sp.CalledProcessError as err:
            print("FFmpeg stdout output on error:\n" + err.output)
    
    
    def trans(clips, effects, out="trans.mp4"):
        filtc = " [v1][v2]xfade=wipedown:duration=1:offset=4[x1];"
        i = 0
        fcv = ""
        fca = ""
        d1 = 0
        af = ""
        dur = []
        aud = []
        inp = ""
        j = 0
        print(len(clips))
    
        for x in clips:
            print(x[0])
            inp = (inp + " -i " + x)
    
            print(effects[0])
            print(x)
    
            v, a = get_duration(fn=x)
            dur.append(v)
    
        k = 0
        for x in dur:
    
            if (k == 0):
                fca = (fca + f"[{k}:a]adelay=0|0 [a{k+1}];")
            else:
                fca = (fca + f"[{k}:a]adelay={d1}|{d1} [a{k+1}];")
            aud.append(f"[a{k+1}]")
            k = (k+1)
            d1 = (d1+((x*1000)+3.5))
    
        d1 = 0
        for x in efects:
            for v in range(0, j+1, +1):
                d1 = (d1 + dur[v])
                d1 = (d1-((v+1)*3.5))
            # [0:a]adelay=0|0 [a1];
            if (i > 1):
    
                try:
                    fcv = (
                        fcv+f"[x{(i)}][{(i)}:v]xfade={x}:duration=3:offset={d1} [x{(i+1)}];")
                except:
                    pass
            else:
                print("j = %d" % j)
                fcv = (
                    fcv+f"[{(i)}:v][{(i+1)}:v]xfade={x}:duration=3:offset={d1} [x{(i+1)}];")
    
            j = (j+1)
            i = (i+1)
    
        for a in aud:
            af = (af+a)
        af = (af+f"amix=inputs={len(aud)} [faud]")
    
        inp = (inp+" -filter_complex \"")
        cmd = (
            f"ffmpeg {inp} {fcv} {fca} {af} \" -pix_fmt yuv420p -map \"[x{i}]\" -map \"[faud]\" -y {out}")
    
        print(cmd)
    
        try:
            pipe = sp.Popen(cmd, stdout=sp.PIPE, stderr=sp.STDOUT,
                            universal_newlines=True)
    
            ffmpeg_output, _ = pipe.communicate()
    
            print(ffmpeg_output)
    
        except sp.CalledProcessError as err:
            print("FFmpeg stdout output on error:\n" + err.output)
            
            


    


    these functions creates ffmpeg code like :
ffmpeg -i out1.mp4 -i out2.mp4 -i out3.mp4 -i out4.mp4 -i out5.mp4 -i out6.mp4 -i out7.mp4 -filter_complex " [0:v][1:v]xfade=wipedown:duration=3:offset=6.006009000000001 [x1] ;[1:v][2:v]xfade=dissolve:duration=3:offset=14.030023 [x2] ;[x2][2:v]xfade=pixelize:duration=3:offset=20.572042000000003 [x3] ;[x3][3:v]xfade=vuslice:duration=3:offset=21.621068000000008 [x4] ;[x4][4:v]xfade=radial:duration=3:offset=14.188099000000015 [x5] ;[x5][5:v]xfade=vertopen:duration=3:offset=-5.737862999999978 [x6] ; [0:a]adelay=0|0 [a1] ;[1:a]adelay=9509.509|9509.509 [a2] ;[2:a]adelay=18531.014000000003|18531.014000000003 [a3] ;[3:a]adelay=27552.519000000004|27552.519000000004 [a4] ;[4:a]adelay=36063.026000000005|36063.026000000005 [a5] ;[5:a]adelay=45084.531|45084.531 [a6] ;[6:a]adelay=53595.038|53595.038 [a7] ; [a1][a2][a3][a4][a5][a6][a7]amix=inputs=7 [faud] " -pix_fmt yuv420p -map "[x6]" -map "[faud]" -y trans.mp4

    


    this ffmpeg command generates error :

    


        ffmpeg version 2022-12-25-git-eeb280f351-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
      built with gcc 12.1.0 (Rev2, 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-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --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-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      57. 43.100 / 57. 43.100
      libavcodec     59. 55.103 / 59. 55.103
      libavformat    59. 34.102 / 59. 34.102
      libavdevice    59.  8.101 / 59.  8.101
      libavfilter     8. 53.100 /  8. 53.100
      libswscale      6.  8.112 /  6.  8.112
      libswresample   4.  9.100 /  4.  9.100
      libpostproc    56.  7.100 / 56.  7.100
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out1.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:09.51, start: 0.000000, bitrate: 1358 kb/s
      Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 1303 kb/s, 26.94 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 51 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'out2.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:09.02, start: 0.000000, bitrate: 1060 kb/s
      Stream #1:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 1007 kb/s, 26.73 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #1:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 47 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'out3.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:09.02, start: 0.000000, bitrate: 1228 kb/s
      Stream #2:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 1178 kb/s, 26.73 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #2:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 46 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'out4.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:08.51, start: 0.000000, bitrate: 987 kb/s
      Stream #3:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 938 kb/s, 26.57 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #3:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 43 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #4, mov,mp4,m4a,3gp,3g2,mj2, from 'out5.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:09.02, start: 0.000000, bitrate: 1221 kb/s
      Stream #4:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 1170 kb/s, 26.73 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #4:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 47 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #5, mov,mp4,m4a,3gp,3g2,mj2, from 'out6.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:08.51, start: 0.000000, bitrate: 1073 kb/s
      Stream #5:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 1027 kb/s, 26.57 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #5:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 41 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #6, mov,mp4,m4a,3gp,3g2,mj2, from 'out7.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:09.02, start: 0.000000, bitrate: 757 kb/s
      Stream #6:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 705 kb/s, 26.73 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #6:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 46 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Filter xfade:default has an unconnected output


    


    Filter xfade:default has an unconnected output , what does it mean ?

    


    in adelay area , getting -ve nos , what to do ?

    


    #useage :

    


    vc = ["C1.mp4", "C2.mp4", "C3.mp4", "C4.mp4", "C5.mp4", "C6.mp4", "C7.mp4"]

    


        i = 1
    gc = []
    for x in vc:
        gc.append(f"out{i}.mp4")
        i = (i+1)
    
    print(gc)
    
    trans(clips=gc, effects=efects)


    


    system details :
windows 10 64 bits
python 3.9 64 bits

    


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