#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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