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    13 avril 2011, par

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  • Bad quality output with FFmpeg, bitrate specified [closed]

    28 septembre 2012, par Darkman2412

    I have a static background image where I add 2 videos on top of it using FFmpeg CLI. The output file (test.avi in this case), is very bad quality.

    ffmpeg -loop 1 -i outro.png
    
      -vf "movie='intro.mov' [last], [last]scale=512:288[scaled1], [in][scaled1] overlay=290:396 [tmp];
    
           movie='intro2.mov' [featured], [featured]scale=512:288[scaled2], [tmp][scaled2] overlay=1118:396 [out]" -b 512k -t 10 -r 30 -y test.avi

    The first image is the first frame of test.avi.
    The second one is what it should be.

    image 1

    image 2

    Edit : my question is why it's such bad quality.

    Edit2 : Console output :

    ffmpeg version N-44601-gcb3591e Copyright (c) 2000-2012 the FFmpeg developers
    
  built on Sep 19 2012 16:31:43 with gcc 4.7.1 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-pthreads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
    
  libavutil      51. 73.101 / 51. 73.101
    
  libavcodec     54. 56.100 / 54. 56.100
    
  libavformat    54. 27.101 / 54. 27.101
    
  libavdevice    54.  2.100 / 54.  2.100
    
  libavfilter     3. 16.104 /  3. 16.104
    
  libswscale      2.  1.101 /  2.  1.101
    
  libswresample   0. 15.100 /  0. 15.100
    
  libpostproc    52.  0.100 / 52.  0.100
    
[image2 @ 0000000001f4fa40] Stream #0: not enough frames to estimate rate; consider increasing probesize
    
Input #0, image2, from 'outro.png':
    
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    
    Stream #0:0: Video: png, rgba64be, 1920x1080, 25 tbr, 25 tbn, 25 tbc
    
Please use -q:a or -q:v, -qscale is ambiguous
    
Output #0, avi, to 'test.avi':
    
  Metadata:
    
    ISFT            : Lavf54.27.101
    
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1920x1080, q=2-31, 200 kb/s, 30 tbn, 30 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (png -> mpeg4)
    
Press [q] to stop, [?] for help
    
frame=    6 fps=0.0 q=2.0 size=      72kB time=00:00:00.23 bitrate=2527.9kbits/s    
    
frame=   12 fps= 11 q=2.0 size=     115kB time=00:00:00.46 bitrate=2013.6kbits/s    
    
frame=   18 fps= 11 q=2.0 size=     190kB time=00:00:00.70 bitrate=2223.8kbits/s    
    
frame=   24 fps= 11 q=2.0 size=     235kB time=00:00:00.96 bitrate=1987.4kbits/s    
    
frame=   30 fps= 11 q=2.0 size=     314kB time=00:00:01.20 bitrate=2142.8kbits/s    
    
frame=   36 fps= 11 q=2.0 size=     368kB time=00:00:01.43 bitrate=2102.2kbits/s    
    
frame=   42 fps= 11 q=2.0 size=     457kB time=00:00:01.66 bitrate=2247.6kbits/s    
    
frame=   48 fps= 11 q=2.0 size=     510kB time=00:00:01.90 bitrate=2199.8kbits/s    
    
frame=   54 fps= 11 q=2.0 size=     596kB time=00:00:02.16 bitrate=2253.9kbits/s    
    
frame=   60 fps= 11 q=2.0 size=     649kB time=00:00:02.40 bitrate=2216.5kbits/s    
    
frame=   66 fps= 11 q=2.0 size=     718kB time=00:00:02.63 bitrate=2232.9kbits/s    
    
frame=   72 fps= 11 q=2.0 size=     779kB time=00:00:02.86 bitrate=2226.4kbits/s    
    
frame=   78 fps= 11 q=2.0 size=     868kB time=00:00:03.10 bitrate=2293.0kbits/s    
    
frame=   84 fps= 11 q=2.0 size=     956kB time=00:00:03.36 bitrate=2325.8kbits/s    
    
frame=   90 fps= 11 q=2.0 size=    1049kB time=00:00:03.60 bitrate=2386.2kbits/s    
    
frame=   96 fps= 11 q=2.0 size=    1143kB time=00:00:03.83 bitrate=2442.9kbits/s    
    
frame=  101 fps= 11 q=2.0 size=    1224kB time=00:00:04.03 bitrate=2485.2kbits/s    
    
frame=  106 fps= 10 q=2.0 size=    1259kB time=00:00:04.23 bitrate=2436.7kbits/s    
    
frame=  111 fps= 10 q=2.0 size=    1326kB time=00:00:04.43 bitrate=2449.5kbits/s    
    
frame=  116 fps= 10 q=2.0 size=    1355kB time=00:00:04.63 bitrate=2396.5kbits/s    
    
frame=  121 fps= 10 q=2.0 size=    1409kB time=00:00:04.83 bitrate=2388.1kbits/s    
    
frame=  127 fps= 10 q=2.0 size=    1424kB time=00:00:05.06 bitrate=2302.5kbits/s    
    
frame=  133 fps= 10 q=2.0 size=    1480kB time=00:00:05.30 bitrate=2286.8kbits/s    
    
frame=  139 fps= 10 q=2.0 size=    1497kB time=00:00:05.56 bitrate=2203.7kbits/s    
    
frame=  145 fps= 10 q=2.0 size=    1552kB time=00:00:05.80 bitrate=2191.8kbits/s    
    
frame=  151 fps= 10 q=2.0 size=    1567kB time=00:00:06.03 bitrate=2127.6kbits/s    
    
frame=  157 fps= 10 q=2.0 size=    1621kB time=00:00:06.26 bitrate=2119.2kbits/s    
    
frame=  163 fps= 10 q=2.0 size=    1641kB time=00:00:06.50 bitrate=2068.1kbits/s    
    
frame=  169 fps= 10 q=2.0 size=    1710kB time=00:00:06.76 bitrate=2070.3kbits/s    
    
frame=  175 fps= 10 q=2.0 size=    1750kB time=00:00:07.00 bitrate=2047.9kbits/s    
    
frame=  181 fps= 10 q=2.0 size=    1834kB time=00:00:07.23 bitrate=2077.6kbits/s    
    
frame=  187 fps= 10 q=2.0 size=    1876kB time=00:00:07.46 bitrate=2058.4kbits/s    
    
frame=  193 fps= 10 q=2.0 size=    1962kB time=00:00:07.70 bitrate=2087.7kbits/s    
    
frame=  199 fps= 10 q=2.0 size=    2005kB time=00:00:07.96 bitrate=2061.5kbits/s    
    
frame=  205 fps= 10 q=2.0 size=    2088kB time=00:00:08.20 bitrate=2086.1kbits/s    
    
frame=  211 fps= 10 q=2.0 size=    2126kB time=00:00:08.43 bitrate=2065.0kbits/s    
    
frame=  217 fps= 10 q=2.0 size=    2201kB time=00:00:08.66 bitrate=2080.5kbits/s    
    
frame=  223 fps= 10 q=2.0 size=    2230kB time=00:00:08.90 bitrate=2052.8kbits/s    
    
frame=  229 fps= 10 q=2.0 size=    2293kB time=00:00:09.16 bitrate=2049.5kbits/s    
    
frame=  235 fps= 10 q=2.0 size=    2307kB time=00:00:09.40 bitrate=2010.4kbits/s    
    
frame=  241 fps= 10 q=2.0 size=    2366kB time=00:00:09.63 bitrate=2011.8kbits/s    
    
frame=  247 fps= 10 q=2.0 size=    2409kB time=00:00:09.86 bitrate=2000.1kbits/s    
    
frame=  250 fps= 10 q=2.0 Lsize=    2438kB time=00:00:10.00 bitrate=1997.2kbits/s    
    

    
video:2425kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.523809%

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