I edited some videos via ffmpeg
as follows (it is a Ubuntu 10.04 64 bit server on an SSH connection)
Code:
ffmpeg -i stats_estimation.mp4 -ar 22050 -acodec libmp3lame -ab 32K -r 25 -vcodec flv out2.flv
Things started perfectly
Code:
FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1, Copyright (c) 2000-2009
Fabrice Bellard, et al.
configuration: --extra-version=4:0.5.1-1ubuntu1 --prefix=/usr
--enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib
--enable-libgsm --enable-libschroedinger --enable-libspeex
--enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib
--disable-stripping --disable-vhook --enable-runtime-cpudetect
--enable-gpl --enable-postproc --enable-swscale --enable-x11grab
--enable-libdc1394 --enable-shared --disable-static
libavutil 49.15. 0 / 49.15. 0
libavcodec 52.20. 1 / 52.20. 1
libavformat 52.31. 0 / 52.31. 0
libavdevice 52. 1. 0 / 52. 1. 0
libavfilter 0. 4. 0 / 0. 4. 0
libswscale 0. 7. 1 / 0. 7. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on Mar 4 2010 12:41:55, gcc: 4.4.3
Seems stream 0 codec frame rate differs from container frame rate:
29.94 (5000/167) -> 44.92 (539/12)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'stats_estimation.mp4':
Duration: 02:47:05.56, start: 0.000000, bitrate: 237 kb/s
Stream #0.0(eng): Video: h264, yuv420p, 320x240, 44.92 tbr, 14.97
tbn, 29.94 tbc
Stream #0.1(eng): Audio: aac, 32000 Hz, stereo, s16
Output #0, flv, to 'out2.flv':
Stream #0.0(eng): Video: flv, yuv420p, 320x240, q=2-31, 200 kb/s,
90k tbn, 25 tbc
Stream #0.1(eng): Audio: libmp3lame, 22050 Hz, stereo, s16, 32 kb/s
Stream mapping:
Stream #0.0 -> #0.0
but the quality of resulting video is very poor.
What I see is when I enlarge the video there are square marks and
objects in video are blurred.
I had tried using
Code:
ffmpeg -i stats_estimation.mp4 -ar 22050 -acodec libmp3lame -ab 32K -r 25 -s 470x290 -vcodec flv out2.flv
thinking as if size might have been the problem but that did not fixed
the issue I get the out put video as poor where as the video (which is
mp4)
is of good quality and no deterioration in its quality when I see the
unconverted video.
ffmpeg is doing some thing which makes the original quality go.
So any suggestions on this part?