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• ffmpeg : Frame perfect overlay of two videos

  13 mai 2018, par SuperUser_Novice

  I'm using ffmpeg to overlay two videos, one being a collection of qr codes to be used later to check for streaming errors.

  The problem I'm having is that despite creating a video using the same framerate and number of frames, I can't get my program to match the frames up in such a way that they overlay frame for frame.

  I haven't been able to find a way to specify to ffmpeg that it should overlay based on frames rather than duration and timestamps. As a result the zbar scanner is picking up duplicated and dropped frames every 700 or so frames into the video.

  (edit: It was later found that this does not appear to be possible, thus I came up with a very hacky way of getting frame-perfect overlay, detailed in the answers.)

• ffmpeg EOF error when converting stream

  13 mai 2018, par macawman

  I am trying to capture a single frame and save as a image file using ffmpeg from the command line in linux. I am using the command below with other streams without any issues. With one stream I am getting an error that looks like "http://ip: End of file"

  ffmpeg -i http://ip -r 1 -qscale 1 -vframes 1 -y -f image2 t.jpg

  I am not sure what is different between these stream except maybe a different resolution. I was wondering if anything can be changed or added to the command to possibly get this stream to work?

  thanks

• Retrieve information from output using Windows Batch

  13 mai 2018, par HASJ

  I want to get this FFmpeg output:

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Videos\youtube.mp4':
    Metadata:
      major_brand     : isom
      minor_version   : 512
      compatible_brands: isomiso2avc1mp41
      encoder         : Lavf57.28.100
    Duration: 00:27:58.85, start: 0.000000, bitrate: 12157 kb/s
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 12024 kb/s, 23.98 fps, 23.98 tbr, 11988 tbn, 47.95 tbc (default)
      Metadata:
        handler_name    : VideoHandler
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 129 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
  Stream mapping:
    Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265))
    Stream #0:1 -> #0:1 (copy)
  Press [q] to stop, [?] for help
  Output #0, matroska, to 'D:\Videos\youtube.mkv':
    Metadata:
      major_brand     : isom
      minor_version   : 512
      compatible_brands: isomiso2avc1mp41
      encoder         : Lavf57.83.100
      Stream #0:0(eng): Video: hevc (libx265), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 1k tbn, 23.98 tbc (default)
      Metadata:
        handler_name    : VideoHandler
        encoder         : Lavc57.107.100 libx265
      Stream #0:1(eng): Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, fltp, 129 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
  frame=   19 fps=0.0 q=-0.0 size=       3kB time=00:00:00.98 bitrate=  24.7kbits/s speed= 1.9x    
  frame=   26 fps= 25 q=-0.0 size=       3kB time=00:00:01.00 bitrate=  24.1kbits/s speed=0.972x    
  frame=   36 fps= 22 q=-0.0 size=       3kB time=00:00:01.47 bitrate=  16.4kbits/s speed=0.913x    
  frame=   48 fps= 22 q=-0.0 size=       3kB time=00:00:01.96 bitrate=  12.3kbits/s speed=0.895x    
  frame=   61 fps= 22 q=-0.0 size=       3kB time=00:00:02.94 bitrate=   8.2kbits/s speed=1.07x    
  frame=   79 fps= 24 q=-0.0 size=       3kB time=00:00:03.43 bitrate=   7.0kbits/s speed=1.05x    
  frame=   95 fps= 25 q=-0.0 size=       3kB time=00:00:04.41 bitrate=   5.5kbits/s speed=1.17x    
  frame=  107 fps= 25 q=-0.0 size=       3kB time=00:00:04.90 bitrate=   4.9kbits/s speed=1.14x    
  frame=  112 fps= 23 q=-0.0 size=       3kB time=00:00:04.90 bitrate=   4.9kbits/s speed=1.02x    
  frame=  121 fps= 23 q=-0.0 size=       3kB time=00:00:05.39 bitrate=   4.5kbits/s speed=1.01x    
  frame=  130 fps= 22 q=-0.0 size=       3kB time=00:00:05.88 bitrate=   4.1kbits/s speed=0.998x    
  frame=  136 fps= 21 q=-0.0 size=    2971kB time=00:00:05.88 bitrate=4133.5kbits/s speed=0.911x    
  frame=  142 fps= 20 q=-0.0 size=    2971kB time=00:00:06.37 bitrate=3815.4kbits/s speed=0.912x    
  frame=  147 fps= 20 q=-0.0 size=    2971kB time=00:00:06.37 bitrate=3815.4kbits/s speed=0.851x    
  frame=  154 fps= 19 q=-0.0 size=    2971kB time=00:00:06.86 bitrate=3543.2kbits/s speed=0.856x    
  frame=  160 fps= 19 q=-0.0 size=    2971kB time=00:00:07.36 bitrate=3306.8kbits/s speed=0.862x    
  frame=  168 fps= 18 q=-0.0 size=    2971kB time=00:00:07.36 bitrate=3306.8kbits/s speed=0.808x    
  frame=  177 fps= 18 q=-0.0 size=    2971kB time=00:00:07.85 bitrate=3100.0kbits/s speed=0.815x    
  frame=  190 fps= 19 q=-0.0 size=    2971kB time=00:00:08.32 bitrate=2925.3kbits/s speed=0.818x    
  frame=  191 fps= 18 q=-0.0 size=    2971kB time=00:00:08.32 bitrate=2925.3kbits/s speed=0.777x    
  frame=  201 fps= 18 q=-0.0 size=    2971kB time=00:00:08.76 bitrate=2775.8kbits/s speed=0.782x    
  frame=  212 fps= 18 q=-0.0 size=    2971kB time=00:00:09.23 bitrate=2634.9kbits/s speed=0.788x    
  frame=  220 fps= 18 q=-0.0 size=    2971kB time=00:00:09.68 bitrate=2513.0kbits/s speed=0.789x    
  frame=  231 fps= 18 q=-0.0 size=    2971kB time=00:00:09.98 bitrate=2437.7kbits/s speed=0.778x    
  frame=  240 fps= 17 q=-0.0 Lsize=    6190kB time=00:00:09.98 bitrate=5078.7kbits/s speed=0.726x    
  video:6018kB audio:164kB subtitle:0kB other streams:0kB global headers:2kB muxing overhead: 0.129100%
  

  And set the frame= and fps= values to variables.

  I suppose that can be achieved by outputting this to a text file (FFmpeg outputs everything to STDERR) and using FOR with tokens and delims but, as you may know, FFmpeg outputs that information in real time and that's where I get stuck. Does the batch need to be broken down into smaller files and use the CALL command to get the information (just an idea)?

  I need some way to periodically check the lines with frame= and fps= outputs, put their values in variables and the rest I may already know how to do.

  The purpose of getting these into variables is to calculate a percentage and an ETA for the video conversion.

  Thanks in advance.

• ERROR : libmp3lame >= 3.98.3 not found

  12 mai 2018, par Prasad Revanaki

  I am installing ffmpeg utility, but I am facing libmp3lame >= 3.98.3 not found not found error. I am able to find lame-3.99.5-1.el6.rf.x86_64.rpm and lame-libs-3.98.4-1.el6.nux.x86_64.rpm but installing these are not solving the problem. I am not able to find libmp3lame rpm to install.

  Can anyone help me here?

  [root@sdp-dev-03:/opt/ffmpeg] # ./configure --prefix="$HOME/ffmpeg_build" --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" --bindir="$HOME/bin" --extra-libs=-ldl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libvo-aacenc --enable-libxvid --disable-ffplay --enable-gpl --enable-postproc --enable-nonfree --enable-avfilter --enable-pthreads

  ERROR: libmp3lame >= 3.98.3 not found

  If you think configure made a mistake, make sure you are using the latest version from Git. If the latest version fails, report the problem to the ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net. Include the log file "config.log" produced by configure as this will help solve the problem.

• FFMPEG : how to pick a random jpeg file from folder

  12 mai 2018, par J. J.

  I run a batch script in expert mode with the program myffvideoconverter.

  My ffmpeg code is: -i example.jpg

  I would like to choose a random jpeg file from the folder automatically instead the file "example.jpg" Is it possible? Is it possible to copy the used file into a different folder automatically to make sure that no jpeg will be used two times? Thank you for your help.