[FFmpeg-trac] #1712(FFmpeg:new): Audio precision in lossless and long time to encode.
FFmpeg
trac at avcodec.org
Sun Sep 2 12:57:34 CEST 2012
#1712: Audio precision in lossless and long time to encode.
--------------------------------+---------------------------------------
Reporter: Danixu | Type: defect
Status: new | Priority: normal
Component: FFmpeg | Version: unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
--------------------------------+---------------------------------------
Summary of the bug:
Hi, first of all, i'm sorry for my english.
I've tried the last ffmpeg build and i get a problem with Audio precision
in lossless audio file, the audio is delayed about 2 seconds.
The audio is passed to another program throught a pipe, but i know that
the other program isn't the problem, because with a very old ffmpeg
version (SVN 16573, Jan 13 2009) works fine, and i've tried with wav
output without pipe and get the same problem.
If you want, here's a test wav files:
http://www.mediafire.com/?1ewceliyjhspedk
The command line that i've used is :
ffmpeg_old -i "input.ape" -ss 00:59:18.71 -t 00:00:15.55 out_oldffmpeg.wav
ffmpeg -i "input.ape" -ss 00:59:18.71 -t 00:00:15.55 out_newffmpeg.wav
How to reproduce:
{{{
% ffmpeg -i input -ss 00:45:25 -t 00:05:25 -ac 2 -f wav -
The output is a pipe to another program.
'''ffmpeg version''' N-44080-gdfb4757
'''built on''' Aug 31 2012 16:58:51 with gcc 4.7.1 (GCC)
configuration: --enable-gpl --enable-version3 --disable-pthreads --enable-
runt
ime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-
libass -
-enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-l
ibfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-
libopenj
peg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-
libtheo
ra --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-li
bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid
--ena
ble-zlib
}}}
The other thing that i wan to answer is why the program take a long time
to convert a portion of a file, for example:
ffmpeg -i input.ape -ss 00:45:15.42 -t 00:00:15.25 output.wav
the program stay a long time without do anything and then start to
convert. I take about 2 minutes to convert 15s of audio.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1712>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker
More information about the FFmpeg-trac
mailing list