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• Using ffmpeg for videoconference software

  12 novembre 2014, par Pavel

  I have to create a software capable of videoconferencing (through the server or peer-to-peer). I want to :
  1. Capture video and audio from webcum
  2. Compress (encode) it somehow and stream by TCP or UDP
  3. Receive packets from stream
  4. Decompress
  5. Play on a windows form.

  Can I do this with ffmpeg ? I couldn’t find examples of this in the docs ; so
  I would like to know whether it’s possible and if there are any examples
  avaiblable. I had thought of using H263 but any suggestions are welcomed.

  Thanks !

• FFMPEG - Adding a full-frame image to the beginning of a video

  17 janvier 2020, par lyinawake

  I have tried many different ways to try to create a 10 second video file out of an image file and have used all the same switches and codecs as I used to encode my video file. However, when I concat the two using anything but complex_filter (which forces the video through another round of transcoding), the resulting video file is corrupt. I believe this is due to the inherent differences of the 10 second clip that ffmpeg created from the image, but there must be some way to get it to encode the exact same way as my video file.

  Here is the command I am using to turn the image into a 10s video clip (I added a silent mp3 because I thought that an audio stream starting partway through the video was messing things up) :

  ffmpeg -loop 1 -i splash.jpg -i silence.mp3 -c:v libx264 -preset slow -g 60 -r 29.97 -crf 16 -c:a libfdk_aac -b:a 256k -cutoff 18000 -t 5 tmpoutput1.mp4

  Here is the command I am using to encode my video :

  ffmpeg -i input.f4v -c:v libx264 -preset slow -g 60 -r 29.97 -crf 16 -c:a libfdk_aac -b:a 256k -cutoff 18000 tmpoutput2.mp4

  Here is the command I use to convert both of them to .ts to get ready for concat :

  ffmpeg -i tmpoutput1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts tmpoutput1.ts

  And finally the concat (which is where I get crazy video corruption, everything along the way looks fine) :

  ffmpeg -i "concat:tmpoutput1.ts|tmpoutput2.ts" -c copy output.mp4

  Again, the issue is that I’m already transcoding everything once and I should be able to get it to transcode in a similar enough structure so that it can be concatenated without another transcode tacked onto the end.

  Has anyone successfully added a full-frame splash graphic to the front of a video with ffmpeg before ? I am using a brand new cross-compile of ffmpeg as I thought that might be the issue, but alas, the issue persists after the update.

  Thanks !

• Concat videos with ffmpeg does not work [migrated]

  6 mai 2013, par Yannick Schinko

  I'm currently trying to concat 3 Videos which don't have a audio stream and adding a audio file in the same step.

  I created this command which should do the work :

  ffmpeg -y -r 30 -i data\intro.mp4 -vcodec ppm -f image2pipe -i data\render.ppm -i data\outro.mp4 -i "data\I could be the one.mp3" -c:v libx264 -crf 18 -preset slow -pix_fmt yuv420p -c:a copy -filter_complex "[0:0] [1:0] [2:0] concat=n=3:v=1:a=0 [v]" -map [v] -map 3:0 -shortest -metadata title="Development of BrainStoneMod" -metadata description="This is the development of the BrainStoneMod starting from 08th April, 2013" -metadata author="The_BrainStone" -metadata copyright="2013" -metadata year="2013" -metadata composer="" -metadata TBPM="" -metadata TDAT="" gource.mp4

  It is indeed a long command but it satisfied my needs until I wanted to embend the actual video in between a intro and a outro.

  I'm getting this log :

  ffmpeg version N-51639-g7775992 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Apr  5 2013 22:24:22 with gcc 4.8.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrn
  
  b --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libr
  
  tmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheo
  
  ra --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li
  
  bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --ena
  
  ble-zlib
  
    libavutil      52. 25.100 / 52. 25.100
  
    libavcodec     55.  2.100 / 55.  2.100
  
    libavformat    55.  1.100 / 55.  1.100
  
    libavdevice    55.  0.100 / 55.  0.100
  
    libavfilter     3. 49.100 /  3. 49.100
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'data\intro.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.1.100
  
    Duration: 00:00:04.00, start: 0.000000, bitrate: 42 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720
  
  [SAR 1:1 DAR 16:9], 38 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [image2pipe @ 027f0a80] Stream #0: not enough frames to estimate rate; consider
  
  increasing probesize
  
  Input #1, image2pipe, from 'data\render.ppm':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Video: ppm, rgb24, 1280x720, 25 tbr, 25 tbn, 25 tbc
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'data\outro.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.1.100
  
    Duration: 00:00:04.00, start: 0.000000, bitrate: 42 kb/s
  
      Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720
  
  [SAR 1:1 DAR 16:9], 38 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [mp3 @ 02757020] max_analyze_duration 5000000 reached at 5015510 microseconds
  
  [mp3 @ 02757020] Estimating duration from bitrate, this may be inaccurate
  
  Input #3, mp3, from 'data\I could be the one.mp3':
  
    Metadata:
  
      TBPM            : 140
  
      TDAT            : 0000
  
      composer        : Kevin Als
  
    Duration: 00:03:55.91, start: 0.000000, bitrate: 320 kb/s
  
      Stream #3:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
  
  [Parsed_concat_0 @ 028b20e0] Input link in1:v0 parameters (size 1280x720, SAR 0:
  
  1) do not match the corresponding output link in0:v0 parameters (1280x720, SAR 1
  
  :1)
  
  [Parsed_concat_0 @ 028b20e0] Failed to configure output pad on Parsed_concat_0

  What should I do ?

  By the way : This is the command I used before and worked out great :

  ffmpeg -y -r 30 -i "data\I could be the one.mp3" -vcodec ppm -f image2pipe -i data\render.ppm -c:v libx264 -crf 18 -preset slow -pix_fmt yuv420p -c:a copy -map 1:0 -map 0:0 -shortest -metadata title="Development of BrainStoneMod" -metadata description="This is the development of the BrainStoneMod starting from 08th April, 2013" -metadata author="The_BrainStone" -metadata copyright="2013" -metadata year="2013" -metadata composer="" -metadata TBPM="" -metadata TDAT="" gource.mp4

  Any ideas ?