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• How can I concatenate 2 videos with audio using ffmpeg ? [duplicate]

  8 juin 2020, par Easy Tricks For Android

  I tried this command :

  



  ffmpeg -f concat -i mylist.txt -c copy output.mp4


  



  But output.mp4 has no audio.

  



  mylist.txt contains :

  



  file '1.mp4'
file '2.mp4'


  



  Information about 1.mp4 and 2.mp4 :

  



  C:\Users\Admin\OneDrive\Desktop\New folder>ffmpeg -n -i 1.mp4 -i 2.mp4
ffmpeg version git-2020-05-23-26b4509 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200523
  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-libsrt --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-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 48.100 / 56. 48.100
  libavcodec     58. 87.101 / 58. 87.101
  libavformat    58. 43.100 / 58. 43.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 83.100 /  7. 83.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp41isom
    creation_time   : 2020-05-31T08:12:56.000000Z
  Duration: 00:00:05.93, start: 0.000000, bitrate: 186 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 184 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2020-05-31T08:21:56.000000Z
      handler_name    : VideoHandler
      encoder         : AVC Coding
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '2.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp41isom
    creation_time   : 2020-06-01T03:32:58.000000Z
  Duration: 00:00:12.23, start: 0.000000, bitrate: 1909 kb/s
    Stream #1:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 1708 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2020-06-01T04:17:17.000000Z
      handler_name    : VideoHandler
      encoder         : AVC Coding
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 196 kb/s (default)
    Metadata:
      creation_time   : 2020-06-01T04:17:17.000000Z
      handler_name    : SoundHandler
At least one output file must be specified


  


• Revision af3519a385 : Change the use of a reserved color space entry This commit rename a reserved co

  7 novembre 2014, par Yaowu Xu

  Changed Paths :
   Modify /vp9/common/vp9_enums.h

  
  
  Change the use of a reserved color space entry

  This commit rename a reserved color space entry to BT_2020, it intends
  to provide support for VP9 bitstream to pass along the color space
  type defined in BT.2020(Rec.2020)

  please note this entry does not have any effect on encoding/decoding
  behavior, but allow applications to the pass the information along
  from encoding end to decoding end.

  Change-Id : I4678520e89141ea5e8900f7bd1c0e95b710b7091

• ffmpeg stream segmenting loses some frames after initialization

  17 février 2020, par zerociudo

  I use this ffmep command to get stream from usb camera and segment videos of 1 seconds

  ffmpeg -i /dev/video0 -pix_fmt yuv420p -vcodec libx264 \
  
                    -r 15 -x264opts keyint=15:min-keyint=15 -crf 19 \
  
                    -vf drawtext='expansion=strftime:fontfile='/usr/share/fonts/cantarell/Cantarell-Light.otf':fontsize=28:fontcolor=white:shadowcolor=black:shadowx=2:shadowy=1:text='%Y-%m-%d\ %H\\\\:%m\\\\:%S':x=200:y=200'" \
  
                    -f segment -reset_timestamps 1 -segment_time 1 -segment_format mp4 \
  
                    -strftime 1 -map 0 output/%Y-%m-%d-%H:%M:%S.mp4 \

  The output that I get is

  Parsed_drawtext_0 @ 0x5633950a66c0] Using "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"
  
  [Parsed_drawtext_0 @ 0x5633950a66c0] expansion=strftime is deprecated.
  
  [libx264 @ 0x5633950a1680] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x5633950a1680] profile High, level 3.1
  
  [libx264 @ 0x5633950a1680] 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=18 lookahead_threads=3 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=10 keyint_min=6 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=19.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  [segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:14.mp4' for writing
  
  Output #0, segment, to 'output/%Y-%m-%d-%H:%M:%S.mp4':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Video: h264 (libx264), yuv420p, 1280x720, q=-1--1, 10 fps, 10240 tbn, 10 tbc
  
      Metadata:
  
        encoder         : Lavc58.35.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  [segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:18.mp4' for writing
  
  [segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:19.mp4' for writing
  
  [segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:20.mp4' for writing

  You can clearly see that first video is output/2020-02-17-13:39:14.mp4, then something happens and the next video is output/2020-02-17-13:39:18.mp4. After this I lose 3 seconds and my whole videos are delayed by 3 seconds.

  Is my command incorrect or is there something else could cause it ?