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• ffmpeg : concat two clips vertically, but upper one should be bigger

  19 juillet 2022, par Rittari771

  I have two 1920x1080 clips. I know how to concat two clips vertically (the clips share equally the space half, 50% upper clip - 50% bottom) => what would i need to do to get a ratio like 65% 35% ?
So the upper clip would take 65% of the screen space vertically, then the lower bottom clip would fill the rest 35% ?

  


  this is my current code to concat the clips vertically.

  


  ffmpeg -i clip_top.mp4 -i clip_bottom.mp4 -filter_complex "vstack=inputs=2" -vsync 2 final_clip.mp4


  


  here is the same explanation, but with a picture : enter image description here

  


• 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 ?

• Encoder (codec vp8) not found [closed]

  25 juillet 2020, par Nirav Trivedi

  There was a problem !

  


  ffmpeg -i uploads/155799695.wav -i uploads/155799695.webm -map 0:0 -map 1:0 uploads/155799695-merged.webm 2>&1


  


  output :

  


  [0] => ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers
[1] =>   built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16)
[2] =>   configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libdc1394 --enable-libfaac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
[3] =>   libavutil      54. 20.100 / 54. 20.100
[4] =>   libavcodec     56. 26.100 / 56. 26.100
[5] =>   libavformat    56. 25.101 / 56. 25.101
[6] =>   libavdevice    56.  4.100 / 56.  4.100
[7] =>   libavfilter     5. 11.102 /  5. 11.102
[8] =>   libavresample   2.  1.  0 /  2.  1.  0
[9] =>   libswscale      3.  1.101 /  3.  1.101
[10] =>   libswresample   1.  1.100 /  1.  1.100
[11] =>   libpostproc    53.  3.100 / 53.  3.100
[12] => Guessed Channel Layout for  Input Stream #0.0 : stereo
[13] => Input #0, wav, from 'uploads/199606400.wav':
[14] =>   Duration: 00:00:09.01, bitrate: 1411 kb/s
[15] =>     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s
[16] => Input #1, matroska,webm, from 'uploads/199606400.webm':
[17] =>   Metadata:
[18] =>     encoder         : Chrome
[19] =>   Duration: N/A, start: 0.000000, bitrate: N/A
[20] =>     Stream #1:0(eng): Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 12.58 tbr, 1k tbn, 1k tbc (default)
[21] =>     Metadata:
[22] =>       alpha_mode      : 1
[23] => Output #0, webm, to 'uploads/199606400-merged.webm':
[24] =>     Stream #0:0: Audio: vorbis, 0 channels, 128 kb/s
[25] =>     Metadata:
[26] =>       encoder         : Lavc56.26.100 libvorbis
[27] =>     Stream #0:1(eng): Video: vp8, none, q=2-31, 128 kb/s (default)
[28] =>     Metadata:
[29] =>       alpha_mode      : 1
[30] => Stream mapping:
[31] =>   Stream #0:0 -> #0:0 (pcm_s16le (native) -> vorbis (libvorbis))
[32] =>   Stream #1:0 -> #0:1 (vp8 (native) -> ? (?))
[33] => Encoder (codec vp8) not found for output stream #0:1