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• After converting FLV to MP4 format using ffmpeg the MP4 file has 0 bytes [closed]

  28 mars 2013, par user2138489

  Using ffmpeg I converted an FLV file to an MP4 file. But the MP4 file has 0 bytes. The command which i used to convert is

  ffmpeg -i sample.flv -b 1104k -ab 122k sample.mp4

  This is the output I got for the above ffmpeg command :

  ffmpeg version 0.8.5-4:0.8.5-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
  
    built on Jan 24 2013 18:01:36 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  [flv @ 0x64f7a0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from '/home/kirthiga/Desktop/videopine/test.flv':
  
    Metadata:
  
      creationdate    : Thu Mar 28 12:46:29
  
    Duration: 00:00:09.82, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: flv, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 22050 Hz, mono, s16
  
  [buffer @ 0x64f720] w:320 h:240 pixfmt:yuv420p
  
  encoder 'aac' is experimental and might produce bad results.
  
  Add '-strict experimental' if you want to use it.

• PHP ffmpeg conversion error

  6 mars 2016, par Enn Fenn

  I tried to convert some videos with ffmpeg and PHP.

  When I execute the following command in PHP exec()

  /usr/local/bin/ffmpeg -i /home/test/public_html/test.m4v -vcodec libx264 -acodec libmp3lame -r 30 -s 640x480 -b 100k /home/test/public_html/output_640x480_test.m4v

  Output :

  /usr/local/bin/ffmpeg: line 4: /var/log/ffmpeg.log: Permission denied
  
  FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Apr 18 2012 05:19:10 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
  
    configuration: --prefix=/usr/local/src/ffmpeg --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-libdirac --enable-libfaac --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 --enable-libxvid --enable-libvorbis --enable-libtheora
  
    libavutil     50.36. 0 / 50.36. 0
  
    libavcore      0.16. 1 /  0.16. 1
  
    libavcodec    52.108. 0 / 52.108. 0
  
    libavformat   52.93. 0 / 52.93. 0
  
    libavdevice   52. 2. 3 / 52. 2. 3
  
    libavfilter    1.74. 0 /  1.74. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1200.00 (1200/1) -> 10.00 (10/1)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/test/public_html/test.m4v':
  
    Metadata:
  
      major_brand     : M4VP
  
      minor_version   : 1
  
      compatible_brands: M4VPM4V M4A mp42isom
  
      creation_time   : 2013-03-14 10:08:25
  
      encoder         : Mac OS X v10.7.4 (CMA 891, CM 705.78, x86_64)
  
      date            : 2013-03-10T14:05:41+1100
  
    Duration: 00:00:02.30, start: 0.000000, bitrate: 245 kb/s
  
      Stream #0.0(und): Audio: aac, 32000 Hz, 2 channels (FC), s16, 31 kb/s
  
      Metadata:
  
        creation_time   : 2013-03-14 10:08:25
  
      Stream #0.1(und): Video: h264, yuv420p, 400x226 [PAR 1:1 DAR 200:113], 216 kb/s, 10.35 fps, 10 tbr, 600 tbn, 1200 tbc
  
      Metadata:
  
        creation_time   : 2013-03-14 10:08:25
  
  [buffer @ 0xf6093c0] w:400 h:226 pixfmt:yuv420p
  
  [scale @ 0xf609790] w:400 h:226 fmt:yuv420p -> w:640 h:480 fmt:yuv420p flags:0xa0000004
  
  [libx264 @ 0xf605cd0] broken ffmpeg default settings detected
  
  [libx264 @ 0xf605cd0] use an encoding preset (e.g. -vpre medium)
  
  [libx264 @ 0xf605cd0] preset usage: -vpre <speed> -vpre <profile>
  
  [libx264 @ 0xf605cd0] speed presets are listed in x264 --help
  
  [libx264 @ 0xf605cd0] profile is optional; x264 defaults to high
  
  Output #0, ipod, to '/home/test/public_html/output_640x480_test.m4v':
  
      Stream #0.0(und): Video: libx264, yuv420p, 640x480 [PAR 150:113 DAR 200:113], q=2-31, 800 kb/s, 90k tbn, 10 tbc
  
      Metadata:
  
        creation_time   : 2013-03-14 10:08:25
  
      Stream #0.1(und): Audio: libmp3lame, 32000 Hz, 2 channels, s16, 64 kb/s
  
      Metadata:
  
        creation_time   : 2013-03-14 10:08:25
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  </profile></speed>

  The same conversion is working fine in another server. But not in our current server. What should I do to get rid of this error ?

• FFMpeg : h.264 to h.264 with the same quality and bitrate

  6 octobre 2018, par Vasya

  I have a some mp4 video file with 1 video stream, encoded in h.264 and with bitrate XYZ kb/s, for example, let’s have a name xxx.mp4 (not a home video, just a film). Its frames looks like some video data and two horizontal black strips on top and bottom side. On one of those strips there is some text, like "Our XXX super videos". I want to draw a black box on those text with dratext filter. Obviously, that processed video must be with almost same bitrate and same file size. But which options I must put in ffmpeg.exe to do so ? CRF 0 ? CRF 18 ? b:v XYZ ? Two-pass ? VBV with crf 23 -maxrate XYZ -bufsize 2M ?
  I want get video data without any losses in comprasion with original mp4 file.