Hi Klaus,
On 14.08.2011 12:47, Klaus Schmidinger wrote:
On 24.07.2011 20:07, André Weidemann wrote:
Hi Klaus,
On 23.07.2011 16:57, Klaus Schmidinger wrote:
The VDR plugin 'pictures' (part of the original VDR archive)
uses a Perl script named 'pic2mpg', which converts a JPEG
image into an MPEG frame that can be displayed directly
by VDR's primary output device. This is done in essence
by the command sequence
jpegtopnm $Pict |
pnmscale --xscale=$ScaleW --yscale=$ScaleH |
pnmpad --black --width $SW --height $SH |
ppmtoy4m -F $framerate -I p -S 420mpeg2 |
mpeg2enc -f 3 -b 12500 -a $aspect -q 1 -n $system2 -o $Mpeg
(see the actual script for the complete working environment).
While this works fine for SD video, I can't seen to figure
out how to make this work for an HD video output device.
The video frame should be a 1080i frame in my case (my tv
can't handle 1080p), but could optionally also be 720p or
1080p, depending on the actual tv's capabilities.
Can anybody give me a pointer how this script could generate
HD video frames?
I have not used mpeg2enc at all. I usually use convert from
ImageMagick and ffmpeg to convert things. You might want to give those
two a try.
Here are two simple lines to convert a jpg image to mpeg2:
convert $Pict -background '#000000' -resize 1920x1080 -gravity center
-extent 1920x1080 /tmp/test.jpg
ffmpeg -i /tmp/temp.jpg -an -vcodec mpeg2video -b 2500 -s 1920x1080
-qscale 2 -f mpeg2video $Mpeg
Note: Depending on your distro, ffmpeg may not support mpeg2 video
encoding.
For mpeg4 the ffmpeg line looks like this:
ffmpeg -i /tmp/temp.jpg -an -vcodec mpeg4 -b 2500 -s 1920x1080 -qscale
2 -threads 4 -f mp4 -y $Mpeg
For libx264 it looks like this:
ffmpeg -i /tmp/temp.jpg -an -vcodec libx264 -vpre lossless_ultrafast
-s 1920x1080 -qscale 2 -threads 4 -f mp4 $Mpeg
The -vpre parameter requires a preset. They can usually be found under
/usr/share/ffmpeg/libx264-*.ffpreset.
Thanks, that was a great help!
I found this command to work pretty good:
ffmpeg -i /tmp/test.jpg -an -vcodec libx264 -vpre baseline -s 1920x1080
-qscale 2 -f mpegts -y $Mpeg
It generates a decently sized TS file (some 100-200 KB) that can be
displayed with
the dvbhddevice plugin on a TT-S2 6400.
Now I wanted to pipe the output of the convert command into ffmpeg (to
avoid the temporary file),
but that doesn't seem to work:
convert $Pict -background '#000000' -resize 1920x1080 -gravity center
-extent 1920x1080 - | ffmpeg -i pipe:0 -an -vcodec libx264 -vpre
baseline -s 1920x1080 -qscale 2 -f mpegts -y $Mpeg
gives me
ffmpeg version 0.8, Copyright (c) 2000-2011 the FFmpeg developers
built on Jun 23 2011 09:35:04 with gcc 4.5.1 20101208 [gcc-4_5-branch
revision 167585]
configuration: --shlibdir=/usr/lib --prefix=/usr --mandir=/usr/share/man
--libdir=/usr/lib --enable-shared --disable-static --enable-libmp3lame
--enable-libvorbis --enable-libtheora --enable-libspeex --enable-libxvid
--enable-postproc --enable-gpl --enable-x11grab
--extra-cflags='-fomit-frame-pointer -fmessage-length=0 -O2 -Wall
-D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables
-fasynchronous-unwind-tables -g -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 -I/usr/include/gsm' --enable-debug
--disable-stripping --enable-libgsm --enable-libschroedinger
--enable-libdirac --enable-avfilter --enable-libvpx --enable-version3
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264
--enable-libdc1394 --enable-pthreads --enable-librtmp
libavutil 51. 9. 1 / 51. 9. 1
libavcodec 53. 7. 0 / 53. 7. 0
libavformat 53. 4. 0 / 53. 4. 0
libavdevice 53. 1. 1 / 53. 1. 1
libavfilter 2. 23. 0 / 2. 23. 0
libswscale 2. 0. 0 / 2. 0. 0
libpostproc 51. 2. 0 / 51. 2. 0
[mp3 @ 0x807bb00] Format mp3 detected only with low score of 1,
misdetection possible!
[mp3 @ 0x807d900] Header missing
Last message repeated 1 times
[mp3 @ 0x807bb00] Could not find codec parameters (Audio: mp1, 0
channels, s16)
[mp3 @ 0x807bb00] Estimating duration from bitrate, this may be inaccurate
pipe:0: could not find codec parameters
Please try the following:
convert $Pict -background '#000000' -resize 1920x1080 -gravity center
-extent 1920x1080 jpg:- | ffmpeg -f mjpeg -i pipe:0 -an -vcodec libx264
-vpre baseline -s 1920x1080 -qscale 2 -f mpegts -y $Mpeg
André
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