[FFmpeg-trac] #1664(undetermined:open): Transcoding results in dropped frames and lowering fps

FFmpeg trac at avcodec.org
Mon Aug 20 23:35:23 CEST 2012


#1664: Transcoding results in dropped frames and lowering fps
-------------------------------------+-------------------------------------
             Reporter:  Barvinok     |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  mov asp      |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  1
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:   => mov asp
 * status:  new => open
 * component:  FFmpeg => undetermined
 * reproduced:  0 => 1


Comment:

 {{{
 $ ffmpeg -i 00-00-00-00000001.mp4 -qscale 2 out.avi
 ffmpeg version N-43737-g76c3fff Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Aug 20 2012 11:13:22 with gcc 4.6.1 (GCC)
   configuration: --cc=/usr/local/gcc-4.6.1/bin/gcc --enable-libspeex
   libavutil      51. 70.100 / 51. 70.100
   libavcodec     54. 53.100 / 54. 53.100
   libavformat    54. 25.104 / 54. 25.104
   libavdevice    54.  2.100 / 54.  2.100
   libavfilter     3. 11.101 /  3. 11.101
   libswscale      2.  1.101 /  2.  1.101
   libswresample   0. 15.100 /  0. 15.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '00-00-00-00000001.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 0
     compatible_brands: mp41isom
     creation_time   : 1980-01-17 22:55:01
   Duration: 00:00:59.54, start: 0.000000, bitrate: 1168 kb/s
     Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 16000 Hz, mono, s16,
 23 kb/s
     Metadata:
       creation_time   : 1980-01-17 22:55:01
       handler_name    : AudioHandler
     Stream #0:1(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D),
 yuv420p, 640x480 [SAR 1:1 DAR 4:3], 1142 kb/s, 26.79 fps, 15 tbr, 1k tbn,
 15 tbc
     Metadata:
       creation_time   : 1980-01-17 22:55:01
       handler_name    : VideoHandler
 Please use -q:a or -q:v, -qscale is ambiguous
 Output #0, avi, to 'out.avi':
   Metadata:
     major_brand     : isom
     minor_version   : 0
     compatible_brands: mp41isom
     ISFT            : Lavf54.25.104
     Stream #0:0(eng): Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 640x480
 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 15 tbn, 15 tbc
     Metadata:
       creation_time   : 1980-01-17 22:55:01
       handler_name    : VideoHandler
     Stream #0:1(eng): Audio: ac3 ([0] [0][0] / 0x2000), 16000 Hz, mono,
 flt, 96 kb/s
     Metadata:
       creation_time   : 1980-01-17 22:55:01
       handler_name    : AudioHandler
 Stream mapping:
   Stream #0:1 -> #0:0 (mpeg4 -> mpeg4)
   Stream #0:0 -> #0:1 (aac -> ac3)
 Press [q] to stop, [?] for help
 frame=  892 fps=249 q=2.0 Lsize=   14929kB time=00:00:57.88
 bitrate=2112.6kbits/s dup=0 drop=703
 video:14206kB audio:677kB subtitle:0 global headers:0kB muxing overhead
 0.304437%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1664#comment:2>
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