[FFmpeg-trac] #1808(undetermined:new): Auto add yadif/format filter when needed
FFmpeg
trac at avcodec.org
Fri Oct 12 19:52:28 CEST 2012
#1808: Auto add yadif/format filter when needed
-------------------------------------+-------------------------------------
Reporter: burek | Owner:
Type: | Status: new
enhancement | Component:
Priority: wish | undetermined
Version: | Keywords:
unspecified | Blocking:
Blocked By: | Analyzed by developer: 0
Reproduced by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
A guy on #ffmpeg channel (L) tried to re-encode his media, using:
{{{
ffmpeg -i /media/hd/home-videos/raw/test.avi -crf 18 -c:v libx264 -preset
veryslow -c:a flac output.mkv
ffmpeg version 1.0 Copyright (c) 2000-2012 the FFmpeg developers
built on Sep 29 2012 11:22:50 with gcc 4.7.1 (GCC) 20120721 (prerelease)
configuration: --prefix=/usr --enable-libmp3lame --enable-libvorbis
--enable-libxvid --enable-libx264 --enable-libvpx --enable-libtheora
--enable-libgsm --enable-libspeex --enable-postproc --enable-shared
--enable-x11grab --enable-libopencore_amrnb --enable-libopencore_amrwb
--enable-libschroedinger --enable-libopenjpeg --enable-librtmp --enable-
libpulse --enable-libv4l2 --enable-gpl --enable-version3 --enable-runtime-
cpudetect --disable-debug --disable-static
libavutil 51. 73.101 / 51. 73.101
libavcodec 54. 59.100 / 54. 59.100
libavformat 54. 29.104 / 54. 29.104
libavdevice 54. 2.101 / 54. 2.101
libavfilter 3. 17.100 / 3. 17.100
libswscale 2. 1.101 / 2. 1.101
libswresample 0. 15.100 / 0. 15.100
libpostproc 52. 0.100 / 52. 0.100
[avi @ 0x1944240] non-interleaved AVI
[avi @ 0x1944240] Could not find codec parameters for stream 0 (Video:
none (422P / 0x50323234), 704x464): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize'
options
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, avi, from '/media/hd/home-videos/raw/test.avi':
Metadata:
encoder : MEncoder SVN-r35014-4.7.1
Duration: 01:03:09.55, start: 0.000000, bitrate: 158157 kb/s
Stream #0:0: Video: none (422P / 0x50323234), 704x464, SAR 59392:59389
DAR 8192:5399, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
stereo, s16, 1536 kb/s
File 'output.mkv' already exists. Overwrite ? [y/N] Unable to parse option
value "-1" as pixel format
Error opening filters!
}}}
After the suggestion to add "-filter:v yadif=1,format=yuv420p" everything
worked. Here is a log of it:
{{{
<L> in other words, is there a good compressed format viable for archival
purposes?
<L> good meaning produces high quality with relatively low size
<L> mutt
<L> whoops, that was supposed to be for zsh
<R> L: yes, I would use ffmpeg -i input -c:v libx264 -preset veryslow -c:a
flac output.mkv
<R> er, add -crf 18 after the input
<R> that will give you highly compressed (lossy) video and lossless audio
<L> R: darn, i get "Unable to parse option value "-1" as pixel format
<R> pastie.org your command and all output
<L> R: http://pastie.org/5045110
<R> is it interlaced?
<L> i believe it is
<L> i didn't not explicitely deinterlace it
<R> you should, hold on a second
<R> ffmpeg -i input -filter:v yadif:1,format=yuv420p -c:v libx264 -crf 18
-c:a flac output.mkv
<R> L: what is the output fps from the command?
<L> 29.97
<L> i get this tho: No such filter: 'yadif:1'
<R> change it to yadif=1
<R> that should double the framerate of the input.
<L> R: getting somewhere now. must figure out how to set ntsc for v4l2
options
<L> ah, -standard
<L> R: damn, that quality is epic.
}}}
So, the question. Can it be implemented in such a way that ffmpeg doesn't
just say "Could not find codec parameters", but rather to try to
deinterlace it or something, because I believe a lot of ordinary users
won't be able to figure out to just add "-filter:v yadif=1,format=yuv420p"
out of the blue, without any suggestion either from ffmpeg binary or from
reading the docs (which they never do) :)
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1808>
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