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• ffmpeg not giving correct duration of a mp4

  1er juin 2012, par oach

  I am working with ffmpeg to convert videos into flv files via php. The tests I have done do not work for mp4 conversions. I have a 13 second video (videos will be limited to 15 seconds), when it is uploaded and I check the "duration" of the video it comes out over 300 seconds. I have tried changing around how I process the video :

  // original
  
  exec(&#39;ffmpeg -i <path>/<filename> 2>&amp;1&#39;, $output);
  
  
  
  // current
  
  exec(&#39;ffmpeg -i <path>/<filename> 2>&amp;1 | grep "Duration" | cut -d \&#39; \&#39; -f 4 | sed s/,//&#39;, $output);
  
  </filename></path></filename></path>

  The original method did not work for mpg files but the second does, but neither gives me the "correct" duration of a mp4 video. Is there a "special" way to process mp4 files ?

  Thank you for your time and help.

  Update :

  Command line

  ffmpeg -i ./custom_scraping.mp4 2>&1 | grep "Duration" | cut -d ' ' -f 4 | sed s/,//
  
  00:05:15.84

  Complete output (formatted as best I could)

  ffmpeg -i ./custom_scraping.mp4 2>&1
  
  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  
  built on Jan 29 2012 23:55:02 with gcc 4.1.2 20080704 (Red Hat 4.1.2-51)
  
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
  
  libavutil     50.15. 1 / 50.15. 1
  
  libavcodec    52.72. 2 / 52.72. 2
  
  libavformat   52.64. 2 / 52.64. 2
  
  libavdevice   52. 2. 0 / 52. 2. 0
  
  libavfilter    1.19. 0 /  1.19. 0
  
  libswscale     0.11. 0 /  0.11. 0
  
  libpostproc   51. 2. 0 / 51. 2. 0
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 5994.00 (5994/1) -> 29.97 (2997/100)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './custom_scraping.mp4':
  
  Metadata:
  
  major_brand     : mp42
  
  minor_version   : 1
  
  compatible_brands: mp42avc1
  
  Duration: 00:05:15.84, start: 0.000000, bitrate: 36 kb/s
  
  Stream #0.0(eng): Audio: aac, 44100 Hz, stereo, s16, 2 kb/s
  
  Stream #0.1(eng): Video: h264, yuv420p, 480x360, 36 kb/s, 1.04 fps, 29.97 tbr, 2997 tbn, 5994 tbc

  At least one output file must be specified

  Don't know if it helps but from the listing of the file in Linux :
  1432471 May 31 13:33 custom_scraping.mp4

  Let me know if anything else is needed.

• What is the best way to capture a screenshot from a udp multicast stream ? [on hold]

  30 novembre 2017, par yash17

  Currently I’m capturing screenshot from an UDP multicast stream, playing in VLC,using ffmpeg from command line.

  Is there any other tool that can capture the screenshot,with best resolution ?

  edit :
  ffmpeg takes more 3 seconds to capture the screen.Mentioned Below is the log for the same.And I came to know that for streaming,ffmpeg can’t be faster.
  So is there any alternate way,that will help me capture screen instantaneously.

  log :

  ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libtheora --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
  
  libavutil      55. 58.100 / 55. 58.100
  
  libavcodec     57. 89.100 / 57. 89.100
  
  libavformat    57. 71.100 / 57. 71.100
  
  libavdevice    57.  6.100 / 57.  6.100
  
  libavfilter     6. 82.100 /  6. 82.100
  
  libavresample   3.  5.  0 /  3.  5.  0
  
  libswscale      4.  6.100 /  4.  6.100
  
  libswresample   2.  7.100 /  2.  7.100
  
  libpostproc    54.  5.100 / 54.  5.100
  
  [mpeg2video @ 0x390cc60] Invalid frame dimensions 0x0.
  
  Last message repeated 7 times
  
  Input #0, mpegts, from 'udp://@xxx.xx.xx.xx:xxxx':
  
  Duration: N/A, start: 144.130744, bitrate: 4128 kb/s
  
  Program 1 
  
  Metadata:
  
    service_name    : Program-1   
  
    service_provider: Encoder 
  
  Stream #0:0[0x42]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 16:15 DAR 4:3], 4000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  Stream #0:1[0x43]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (mpeg2video (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, image2, to 'player.png':
  
  Metadata:
  
  encoder         : Lavf57.71.100
  
  Stream #0:0: Video: png, rgb24, 720x576 [SAR 16:15 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
  
  Metadata:
  
    encoder         : Lavc57.89.100 png
  
  frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A dup=1 drop=1 speed=0.729x    
  
  video:777kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

• What is the best way to capture a screenshot from a udp stream ?

  8 novembre 2017, par yash17

  I’m trying to capture a screenshot from a udp stream using ffmpeg in a Ubuntu 14.04 System.
  Following is the command

  ffmpeg -y -i udp_ip -vframes 1 -q:v 1 test.png

  But the image captured is of very poor resolution and I observed a lag while taking the screenshot.

  Please suggest a best tool or a way to take a screenshot in the fastest way and also of the best image resolution possible.

  edit :
  log files

  ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libtheora --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libavresample   3.  5.  0 /  3.  5.  0
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  [mpeg2video @ 0x390cc60] Invalid frame dimensions 0x0.
  
      Last message repeated 7 times
  
  Input #0, mpegts, from 'udp://@xxx.xx.xx.xx:xxxx':
  
    Duration: N/A, start: 144.130744, bitrate: 4128 kb/s
  
    Program 1 
  
      Metadata:
  
        service_name    : Program-1   
  
        service_provider: Encoder 
  
      Stream #0:0[0x42]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 16:15 DAR 4:3], 4000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x43]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg2video (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, image2, to 'player.png':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: png, rgb24, 720x576 [SAR 16:15 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.89.100 png
  
  frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A dup=1 drop=1 speed=0.729x    
  
  video:777kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown