#3842: AAC (mp4a) DASH takes abnormally long to detect (~4 - 6s)
---------------------------------+------------------------------------
Reporter: viperfx | Owner:
Type: defect | Status: new
Priority: normal | Component: avformat
Version: 2.2.4 | Resolution:
Keywords: mov | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by cehoyos):
I tested the following:
{{{
$ time ffmpeg -i videoplayback.mp4
ffmpeg version N-65479-g7117547 Copyright (c) 2000-2014 the FFmpeg
developers
built on Aug 10 2014 13:36:46 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl
libavutil 54. 0.100 / 54. 0.100
libavcodec 56. 0.100 / 56. 0.100
libavformat 56. 0.100 / 56. 0.100
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 0.100 / 5. 0.100
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 0.100 / 1. 0.100
libpostproc 53. 0.100 / 53. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videoplayback.mp4':
Metadata:
major_brand : dash
minor_version : 0
compatible_brands: iso6mp41
creation_time : 2014-04-25 14:50:56
Duration: 00:03:35.03, start: 0.000000, bitrate: 128 kb/s
Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 125 kb/s (default)
Metadata:
creation_time : 2014-04-25 14:50:56
handler_name : SoundHandler
At least one output file must be specified
real 0m0.011s
user 0m0.007s
sys 0m0.003s
}}}
The time spent on analyzing the mov file seems reasonable to me.
Playback with ffplay starts immediately afaict (see how the process time
matches the duration):
{{{
$ time ffplay -i videoplayback.mp4 -autoexit
ffplay version N-65479-g7117547 Copyright (c) 2003-2014 the FFmpeg
developers
built on Aug 10 2014 13:36:46 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl
libavutil 54. 0.100 / 54. 0.100
libavcodec 56. 0.100 / 56. 0.100
libavformat 56. 0.100 / 56. 0.100
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 0.100 / 5. 0.100
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 0.100 / 1. 0.100
libpostproc 53. 0.100 / 53. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videoplayback.mp4':f=0/0
Metadata:
major_brand : dash
minor_version : 0
compatible_brands: iso6mp41
creation_time : 2014-04-25 14:50:56
Duration: 00:03:35.03, start: 0.000000, bitrate: 128 kb/s
Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 125 kb/s (default)
Metadata:
creation_time : 2014-04-25 14:50:56
handler_name : SoundHandler
215.02 M-A: 0.000 fd= 0 aq= 0KB vq= 0KB sq= 0B f=0/0
real 3m35.104s
user 0m4.030s
sys 0m2.981s
}}}
How can I reproduce the issue?
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3842#comment:3>
FFmpeg <https://ffmpeg.org>
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