[FFmpeg-trac] #2958(undetermined:new): Transcoding some iPhone camera roll videos outputs excessive frame-rate
FFmpeg
trac at avcodec.org
Fri Sep 13 19:23:46 CEST 2013
#2958: Transcoding some iPhone camera roll videos outputs excessive frame-rate
-------------------------------------+-------------------------------------
Reporter: nealzebub | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: git-master | undetermined
Keywords: mov | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
-------------------------------------+-------------------------------------
Changes (by cehoyos):
* keywords: => mov
* version: unspecified => git-master
Comment:
For future tickets: If a problem is reproducible without external
libraries, please don't use them.
If you are correct and the input video is vfr, I don't think anything can
be done (except fixing vfr in mov).
{{{
$ ffmpeg -i from_iphone4.MOV -q:v 2 -vcodec mpeg4 -strict -2 -acodec aac
out.mov
ffmpeg version N-56261-gfc47726 Copyright (c) 2000-2013 the FFmpeg
developers
built on Sep 13 2013 17:39:25 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl
libavutil 52. 43.100 / 52. 43.100
libavcodec 55. 31.101 / 55. 31.101
libavformat 55. 16.102 / 55. 16.102
libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 84.100 / 3. 84.100
libswscale 2. 5.100 / 2. 5.100
libswresample 0. 17.103 / 0. 17.103
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'from_iphone4.MOV':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2013-01-13 22:11:45
model : iPhone 4
model-eng : iPhone 4
encoder : 6.0.1
encoder-eng : 6.0.1
date : 2013-01-13T17:11:45-0500
date-eng : 2013-01-13T17:11:45-0500
make : Apple
make-eng : Apple
Duration: 00:00:16.87, start: 0.000000, bitrate: 10805 kb/s
Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661),
yuv420p(tv, bt709), 1280x720, 10718 kb/s, 24.33 fps, 600 tbr, 600 tbn,
1200 tbc (default)
Metadata:
creation_time : 2013-01-13 22:11:45
handler_name : Core Media Data Handler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono,
fltp, 63 kb/s (default)
Metadata:
creation_time : 2013-01-13 22:11:46
handler_name : Core Media Data Handler
Output #0, mov, to 'out.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
make-eng : Apple
model : iPhone 4
model-eng : iPhone 4
make : Apple
encoder-eng : 6.0.1
date : 2013-01-13T17:11:45-0500
date-eng : 2013-01-13T17:11:45-0500
encoder : Lavf55.16.102
Stream #0:0(und): Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 1280x720,
q=2-31, 200 kb/s, 19200 tbn, 600 tbc (default)
Metadata:
creation_time : 2013-01-13 22:11:45
handler_name : Core Media Data Handler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono,
fltp, 128 kb/s (default)
Metadata:
creation_time : 2013-01-13 22:11:46
handler_name : Core Media Data Handler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> mpeg4)
Stream #0:1 -> #0:1 (aac -> aac)
Press [q] to stop, [?] for help
frame=10110 fps=697 q=2.0 Lsize= 208383kB time=00:00:16.90
bitrate=100985.7kbits/s dup=9699 drop=0
video:208062kB audio:268kB subtitle:0 global headers:0kB muxing overhead
0.025869%
}}}
Workaround is to specify an output frame rate:
{{{
$ ffmpeg -i from_iphone4.MOV -q:v 2 -vcodec mpeg4 -strict -2 -acodec aac
-r 24 out24.mov
ffmpeg version N-56261-gfc47726 Copyright (c) 2000-2013 the FFmpeg
developers
built on Sep 13 2013 17:39:25 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl
libavutil 52. 43.100 / 52. 43.100
libavcodec 55. 31.101 / 55. 31.101
libavformat 55. 16.102 / 55. 16.102
libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 84.100 / 3. 84.100
libswscale 2. 5.100 / 2. 5.100
libswresample 0. 17.103 / 0. 17.103
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'from_iphone4.MOV':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2013-01-13 22:11:45
model : iPhone 4
model-eng : iPhone 4
encoder : 6.0.1
encoder-eng : 6.0.1
date : 2013-01-13T17:11:45-0500
date-eng : 2013-01-13T17:11:45-0500
make : Apple
make-eng : Apple
Duration: 00:00:16.87, start: 0.000000, bitrate: 10805 kb/s
Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661),
yuv420p(tv, bt709), 1280x720, 10718 kb/s, 24.33 fps, 600 tbr, 600 tbn,
1200 tbc (default)
Metadata:
creation_time : 2013-01-13 22:11:45
handler_name : Core Media Data Handler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono,
fltp, 63 kb/s (default)
Metadata:
creation_time : 2013-01-13 22:11:46
handler_name : Core Media Data Handler
Output #0, mov, to 'out24.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
make-eng : Apple
model : iPhone 4
model-eng : iPhone 4
make : Apple
encoder-eng : 6.0.1
date : 2013-01-13T17:11:45-0500
date-eng : 2013-01-13T17:11:45-0500
encoder : Lavf55.16.102
Stream #0:0(und): Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 1280x720,
q=2-31, 200 kb/s, 12288 tbn, 24 tbc (default)
Metadata:
creation_time : 2013-01-13 22:11:45
handler_name : Core Media Data Handler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono,
fltp, 128 kb/s (default)
Metadata:
creation_time : 2013-01-13 22:11:46
handler_name : Core Media Data Handler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> mpeg4)
Stream #0:1 -> #0:1 (aac -> aac)
Press [q] to stop, [?] for help
frame= 407 fps=248 q=2.0 Lsize= 48379kB time=00:00:16.95
bitrate=23370.3kbits/s dup=0 drop=4
video:48100kB audio:268kB subtitle:0 global headers:0kB muxing overhead
0.022950%
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2958#comment:1>
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