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• FFMPEG merge audio tracks into one and encode using NVENC

  5 novembre 2019, par L0Lock

  I often shoot films with several audio inputs, resulting in video files with multiple audio tracks supposed to be played all together at the same time.
  I usually go through editing those files and there I do whatever I want with those files, but sometimes I would also like to just send the files right away online without editing, in which case I would enjoy FFMPEG’s fast & simple & quality encoding.

  But here’s the catch : most online video streaming services don’t support multiple audio tracks, so I have to merge them into one so we can hear everything.

  I also want to upscale the video (it’s a little trick for the streaming service to trigger its higher quality encoding).
  And finally, since it’s just an encoding meant to just be shared on a streaming service, I prefer a fast & light encoding over quality, which HEVC NVENC is good for.

  So far I’ve tried to use the amix advanced filter and I try to use the Lanczos filter for upscaling which seems to give a better result in my case.

  The input file is quite simple :

  Stream 0:0 : video track
  Stream 0:1 : main audio recording
  Stream 0:2 : secondary audio recording

  The audio tracks are at the correct volume and duration and position in time, so the only thing I need is really just to turn them into one track

  ffmpeg -i "ow_raw.mp4" -filter_complex "[0:1][0:2]amix=inputs=2[a]" -map "0:0" -map "[a]" -c:v hevc_nvenc -preset fast -level 4.1 -pix_fmt yuv420p -vf scale=2560:1:flags=lanczos "ow_share.mkv" -y

  But it doesn’t work :

  ffmpeg version N-94905-g8efc9fcc56 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.1.1 (GCC) 20190807
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 35.100 / 56. 35.100
  
    libavcodec     58. 56.101 / 58. 56.101
  
    libavformat    58. 32.104 / 58. 32.104
  
    libavdevice    58.  9.100 / 58.  9.100
  
    libavfilter     7. 58.102 /  7. 58.102
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'ow_raw.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2019-11-02T16:43:32.000000Z
  
      date            : 2019
  
    Duration: 00:15:49.79, start: 0.000000, bitrate: 30194 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt470m), 1920x1080 [SAR 1:1 DAR 16:9], 29805 kb/s, 60 fps, 60 tbr, 90k tbn, 120 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-11-02T16:43:32.000000Z
  
        handler_name    : VideoHandle
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 196 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-11-02T16:43:32.000000Z
  
        handler_name    : SoundHandle
  
      Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 184 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-11-02T16:43:32.000000Z
  
        handler_name    : SoundHandle
  
  Stream mapping:
  
    Stream #0:1 (aac) -> amix:input0 (graph 0)
  
    Stream #0:2 (aac) -> amix:input1 (graph 0)
  
    Stream #0:0 -> #0:0 (h264 (native) -> hevc (hevc_nvenc))
  
    amix (graph 0) -> Stream #0:1 (libvorbis)
  
  Press [q] to stop, [?] for help
  
  [hevc_nvenc @ 000002287e34a040] InitializeEncoder failed: invalid param (8)
  
  Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  Conversion failed!

• How to exclude night images to be passed for ffmpeg ?

  4 novembre 2019, par LA_

  My files have the following filenames -

  YYYYMMDDHHmmSS.jpg

  I pass them to ffmpeg (on MacOS) for timelapse creation :

  ffmpeg -framerate 500 -pattern_type glob -i '*.jpg' -c:v libx264 -pix_fmt yuv420p out.mp4

  Now I would like to exclude night photos, for ex., if filename is between YYYYMMDD200000.jpg and YYYYMMDD080000.jpg, then files shouldn’t be passed to ffmpeg.

  How could I achieve that (ideally - without moving files) ?

  Upd. Using the following command now, but it captures the following hours only : 10-19.

  ffmpeg -framerate 500 -pattern_type glob -i '2019[01][089][012][0123456789]1*.jpg' -c:v libx264 -pix_fmt yuv420p out3.mp4

• How to make my video in landscape mode using ffmpeg

  6 novembre 2019, par Aarwil

  I have four video chats. Somehow I have managed to cut videos into pieces, stored in array then stacked and finally concat the video which is in the youtube link down below. I have used the size in the portrait view is 640*480. But I need to show them in the landscape. Suggest me any ideas.

  Landscape view :
  https://youtu.be/u8tmL2-CdK0
  Portrait view :
  https://youtu.be/lO-Q3I9X8OA

  These are my inputs

  Input #0, matroska,webm, from 'PA473fbf06ed1f952f95c88b9cf22ed0ba_pre.mkv':
 Metadata:
   encoder         : GStreamer matroskamux version 1.8.1.1
   creation_time   : 2019-11-05T06:08:19.000000Z
 Duration: 00:01:05.50, start: 63.041000, bitrate: 30 kb/s
   Stream #0:0(eng): Video: h264 (Baseline), yuvj420p(pc, progressive), 360x480, SAR 1:1 DAR 3:4, 15 tbr, 1k tbn, 2k tbc (default)
   Metadata:
     title           : Video
Input #1, matroska,webm, from 'PA183db0ed986039de3197092103a411eb_pre.mkv':
 Metadata:
   encoder         : GStreamer matroskamux version 1.8.1.1
   creation_time   : 2019-11-05T06:07:20.000000Z
 Duration: 00:03:15.14, start: 4.062000, bitrate: 172 kb/s
   Stream #1:0(eng): Video: h264 (Baseline), yuvj420p(pc, progressive), 360x480, SAR 1:1 DAR 3:4, 15 fps, 15 tbr, 1k tbn, 2k tbc (default)
   Metadata:
     title           : Video
Input #2, matroska,webm, from 'PA62a810038cbcc00be21fac43e98f5ee1_pre.mkv':
 Metadata:
   encoder         : GStreamer matroskamux version 1.8.1.1
   creation_time   : 2019-11-05T06:07:45.000000Z
 Duration: 00:02:21.71, start: 28.803000, bitrate: 92 kb/s
   Stream #2:0(eng): Video: h264 (Baseline), yuvj420p(pc, progressive), 360x480, SAR 1:1 DAR 3:4, 15 tbr, 1k tbn, 2k tbc (default)
   Metadata:
     title           : Video
Input #3, matroska,webm, from 'PA8fa44ff1ba37ee510a045198bca6f04a_pre.mkv':
 Metadata:
   encoder         : GStreamer matroskamux version 1.8.1.1
   creation_time   : 2019-11-05T06:07:48.000000Z
 Duration: 00:01:50.69, start: 32.318000, bitrate: 28 kb/s
   Stream #3:0(eng): Video: h264 (Baseline), yuvj420p(pc, progressive), 360x480, SAR 1:1 DAR 3:4, 15 fps, 15 tbr, 1k tbn, 2k tbc (default)
   Metadata:
     title           : Video

  At first, I change all the video resolution to 640:480 because each video may have different resolution (probability). So I am setting a fixed resolution.

  ffmpeg -i PA8fa44ff1ba37ee510a045198bca6f04a_pre.mkv -vf scale=640:480 PA8fa44ff1ba37ee510a045198bca6f04a.mkv -hide_banner
Input #0, matroska,webm, from PA8fa44ff1ba37ee510a045198bca6f04a_pre.mkv':
 Metadata:
   encoder         : GStreamer matroskamux version 1.8.1.1
   creation_time   : 2019-11-05T06:07:48.000000Z
 Duration: 00:01:50.69, start: 32.318000, bitrate: 28 kb/s
   Stream #0:0(eng): Video: h264 (Baseline), yuvj420p(pc, progressive), 360x480, SAR 1:1 DAR 3:4, 15 fps, 15 tbr, 1k tbn, 2k tbc (default)
   Metadata:
     title           : Video
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[swscaler @ 0000021d72eb3f80] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0000021d72b33b40] using SAR=9/16
[libx264 @ 0000021d72b33b40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0000021d72b33b40] profile High, level 2.2, 4:2:0, 8-bit
[libx264 @ 0000021d72b33b40] 264 - core 158 r2984 3759fcb - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - 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=6 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=15 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, matroska, to 'PA8fa44ff1ba37ee510a045198bca6f04a.mkv':
 Metadata:
   encoder         : Lavf58.32.104
   Stream #0:0(eng): Video: h264 (libx264) (H264 / 0x34363248), yuvj420p(pc), 640x480 [SAR 9:16 DAR 3:4], q=-1--1, 15 fps, 1k tbn, 15 tbc (default)
   Metadata:
     title           : Video
     encoder         : Lavc58.56.101 libx264

  Two videos merging command

  ffmpeg
-i ddb97d85-fc21-4fb4-8062-ca2084a48aeb.mkv
-i a8665a5f-fb5e-44cb-a072-070fbe07a14f.mkv
-filter_complex "[0:v][1:v]hstack" 1572934056.mkv

  Three videos merging command

  ffmpeg
-i 16f90447-c8b6-4077-b3b6-4fb2c07e19b5.mkv
-i ef501109-0ee9-4924-8de1-65eb796a4a78.mkv
-i 0b284aa6-4175-472c-aaf6-837412f97f32.mkv
-filter_complex "[1:v]scale=320:-1[left]; [2:v]scale=320:-1[right]; [left][right]hstack[bottom]; [0:v][bottom]vstack" 1572934058.mkv

  Concat Command

  ffmpeg
-i 1572934031.mkv -i 1572934056.mkv -i 1572934058.mkv -i 1572934089.mkv -i 1572934155.mkv -i 1572934169.mkv -i 1572934198.mkv -filter_complex "[0]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[0v];[1]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[1v];[2]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[2v];[3]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[3v];[4]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[4v];[5]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[5v];[6]scale=640:480:force_original_aspect_ratio=decrease,pad=640:480:(ow-iw)/2:(oh-ih)/2,fps=fps=30,setsar=1[6v];[0v][1v][2v][3v][4v][5v][6v]concat=n=7:v=1:a=0[v]" -map "[v]" 4c21f002fa76b148c00cc6fbceaa57ee.mp4