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• Adding a watermark with FFMPEG via Rails

  16 juin 2016, par Felix

  in my Rails app I want to use ffmpeg to add a watermark to a movie while uploading.

  For that I’ve added the stremio-ffmpeg gem.

  My code looks like this :

  options = {watermark: Rails.root.join('public/images/logo_klein.png'), watermark_filter: {position: "RT", padding_x: 10, padding_y: 10}, custom: '-strict experimental'}
  
  
  
  tmp_path = File.join File.dirname(current_path), "tmp_file.mp4"
  
  file = FFMPEG::Movie.new(self.file.path)
  
  file.transcode(tmp_path, options)
  
  
  
  File.rename tmp_path, current_path

  But my Image is not added to the movie. wenn I call http://localhost/images/logo_klein.php it is shown in browser (image)

  What could be the problem for not added into the movie ? When I follow the console out transcoding is started properly. But nothing mentioned of watermarking only transcoding is mentiond

  console output :

   INFO -- : Running transcoding...
  
  ffmpeg -y -i /var/www/ji/public/uploads/tmp/1466030485-10470-0                                                              013-4987/2016-06-08_09.50.55.mp4   -strict experimental /var/www/ji/public/uploads/tmp/1466030485-10470-0013-4987/tmp_file.mp4

  What could be the problem ?

• Using the ffmpeg to extract video stream

  27 juin 2016, par user1395066

  I try to extract the video stream from the bbb-1920x1080-cfg02.mkv

  The command as follows.

  ffmpeg -i bbb-1920x1080-cfg02.mkv -map 0:0 -c copy bbb.mkv

  But the output file can’t play with the player(potplayer)

  I used the ffmpeg -i bbb.mkv to check the information and there were lots of
  error messages.

  ffmpeg version N-80680-ga887fbb Copyright (c) 2000-2016 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
  configuration: --enable-vaapi --disable-vda --disable-vdpau --disable-libxcb  --disable-ffplay --disable-ffserver --disable-ffprobe --disable-indev=jack --disable-outdev=sdl --enable-libx264 --enable-libx265 --enable-gpl --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --disable-libxcb-shape --disable-x11grab
  
  libavutil      55. 26.100 / 55. 26.100
  
  libavcodec     57. 46.100 / 57. 46.100
  
  libavformat    57. 40.101 / 57. 40.101
  
  libavdevice    57.  0.101 / 57.  0.101
  
  libavfilter     6. 46.102 /  6. 46.102
  
  libswscale      4.  1.100 /  4.  1.100
  
  libswresample   2.  1.100 /  2.  1.100
  
  libpostproc    54.  0.100 / 54.  0.100
  
  [hevc @ 0x3a64a60] No start code is found.
  
  [hevc @ 0x3a64a60] Error splitting the input into NAL units.
  
  [hevc @ 0x3a64a60] No start code is found.

  Even I just make a copy of the source file.

  ffmpeg -i bbb-1920x1080-cfg02.mkv -map 0 -c copy bbb.mkv

  The output file(bbb.mkv) still can’t play with the player(potplayer)
  It still has "[hevc @ 0x3a64a60] No start code is found" error.

  As the document said that it would do notthing but just encapsulate the matroska format.

  Is anyone can teach me how to figure out this problem ?

  Thanks

• FFMPEG:merging Image and Audio duration getting increased [migrated]

  21 juin 2016, par Saikat Dey

  I am trying to create a video using a still image(.png) with audio(.wav) file using FFMPEG with video duration equal to audio duration but even keeping ’-shortest’ & ’-loop 1’ as flag, pegstill video duration is always 2 seconds more than audio duration.

  This is causing problem because, after the video creation i am merging several videos together to create a final video. Now what is happening is that in that 2 seconds extra time, the next video’s audio comes which is causing video-audio unsync. Even if I delay the audio stream, there is a blank sound while transition from one video to another.

  So i wanted to ask why there is extra 2 seconds and how can i remove it.
  My ffmpeg command :

  ffmpeg -loop 1 -i imgPath -i audioPath -c:v libx264 -c:a aac -strict experimental -pix_fmt yuv420p -vf resolution -b:a 192k -shortest videoPath

  Console Output :

  ffmpeg version N-78598-g98a0053 Copyright (c) 2000-2016 the FFmpeg developers
  
  built with gcc 5.3.0 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
  libavutil      55. 18.100 / 55. 18.100
  
  libavcodec     57. 24.103 / 57. 24.103
  
  libavformat    57. 25.101 / 57. 25.101
  
  libavdevice    57.  0.101 / 57.  0.101
  
  libavfilter     6. 34.100 /  6. 34.100
  
  libswscale      4.  0.100 /  4.  0.100
  
  libswresample   2.  0.101 /  2.  0.101
  
  libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, png_pipe, from 'image.png':
  
  Duration: N/A, bitrate: N/A
  
    Stream #0:0: Video: png, rgb24(pc), 1058x794 [SAR 3779:3781 DAR 621141:466396], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Guessed Channel Layout for  Input Stream #1.0 : stereo
  
  Input #1, wav, from 'audio.wav':
  
  Duration: 00:00:15.25, bitrate: 1411 kb/s
  
  Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s
  
  [libx264 @ 0068f820] using SAR=2587/2590
  
  [libx264 @ 0068f820] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0068f820] profile High, level 3.1
  
  [libx264 @ 0068f820] 264 - core 148 r2665 a01e339 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - 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=25 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, mp4, to 'video.mp4':
  
  Metadata:
  
  encoder         : Lavf57.25.101
  
  Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 800x600 [SAR 5997273:6004228 DAR 621141:466396], q=-1--1, 25 fps, 12800 tbn, 25 tbc
  
  Metadata:
  
    encoder         : Lavc57.24.103 libx264
  
  Side data:
  
    cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 192 kb/s
  
  Metadata:
  
    encoder         : Lavc57.24.103 aac
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  frame=   47 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
  
  frame=   66 fps= 66 q=28.0 size=      16kB time=00:00:00.56 bitrate= 234.8kbits/s speed=0.559x    
  
  frame=   91 fps= 60 q=28.0 size=      40kB time=00:00:01.56 bitrate= 211.2kbits/s speed=1.04x    
  
  frame=  123 fps= 61 q=28.0 size=      72kB time=00:00:02.84 bitrate= 206.6kbits/s speed=1.41x    
  
  frame=  160 fps= 64 q=28.0 size=     108kB time=00:00:04.32 bitrate= 203.9kbits/s speed=1.72x    
  
  frame=  197 fps= 65 q=28.0 size=     143kB time=00:00:05.80 bitrate= 201.8kbits/s speed=1.92x    
  
  frame=  231 fps= 66 q=28.0 size=     176kB time=00:00:07.16 bitrate= 201.3kbits/s speed=2.03x    
  
  frame=  270 fps= 67 q=28.0 size=     214kB time=00:00:08.72 bitrate= 200.6kbits/s speed=2.17x    
  
  frame=  307 fps= 68 q=28.0 size=     252kB time=00:00:10.20 bitrate= 202.6kbits/s speed=2.25x    
  
  frame=  343 fps= 68 q=28.0 size=     286kB time=00:00:11.64 bitrate= 201.6kbits/s speed=2.31x    
  
  frame=  380 fps= 69 q=28.0 size=     323kB time=00:00:13.12 bitrate= 201.6kbits/s speed=2.37x    
  
  frame=  416 fps= 69 q=28.0 size=     357kB time=00:00:14.56 bitrate= 200.9kbits/s speed=2.41x    
  
  frame=  433 fps= 68 q=-1.0 Lsize=     391kB time=00:00:17.24 bitrate= 185.6kbits/s speed= 2.7x    
  
  video:18kB audio:358kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.837568%
  
  [libx264 @ 0068f820] frame I:2     Avg QP: 7.83  size:  2710
  
  [libx264 @ 0068f820] frame P:109   Avg QP: 9.51  size:    35
  
  [libx264 @ 0068f820] frame B:322   Avg QP:12.67  size:    27
  
  [libx264 @ 0068f820] consecutive B-frames:  0.7%  0.5%  0.0% 98.8%
  
  [libx264 @ 0068f820] mb I  I16..4: 97.9%  0.1%  2.1%
  
  [libx264 @ 0068f820] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.0%  0.0%  0.0%  0.0%  0.0%    skip:100.0%
  
  [libx264 @ 0068f820] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.1%  0.0%  0.0%  direct: 0.0%  skip:99.9%  L0:65.9% L1:34.1% BI: 0.0%
  
  [libx264 @ 0068f820] 8x8 transform intra:0.1% inter:28.6%
  
  [libx264 @ 0068f820] coded y,uvDC,uvAC intra: 1.6% 2.1% 2.1% inter: 0.0% 0.0% 0.0%
  
  [libx264 @ 0068f820] i16 v,h,dc,p: 97%  0%  3%  0%
  
  [libx264 @ 0068f820] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 50%  0% 50%  0%  0%  0%  0%  0%  0%
  
  [libx264 @ 0068f820] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 37% 18% 19%  3%  6%  4%  6%  2%  5%
  
  [libx264 @ 0068f820] i8c dc,h,v,p: 98%  1%  1%  0%
  
  [libx264 @ 0068f820] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0068f820] ref P L0: 70.5% 11.4%  9.1%  9.1%
  
  [libx264 @ 0068f820] ref B L0: 50.2% 49.8%
  
  [libx264 @ 0068f820] ref B L1: 99.2%  0.8%
  
  [libx264 @ 0068f820] kb/s:8.23
  
  [aac @ 0067e4c0] Qavg: 439.702

  You can see here that my audio.wav Duration : 00:00:15.25, but output video.mp4 is 00:00:17.24.