#252: matroska/rawvideo decoding gives invalid pixel format string -1 @ buffer
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Reporter: kenney | Type: defect
Status: new | Priority: normal
Component: avformat | Version: git
Keywords: matroska rawvideo pix_fmt | Blocked By:
Blocking: | Reproduced: 0
Analyzed: 0 |
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The error:
{{{
[buffer @ 00000000003F8E80] Invalid pixel format string '-1'
Error opening filters!
}}}
I am converting an mkv file with a V_UNCOMPRESSED or -vcodec rawvideo
video stream to any other stream, let's say .avi.
First create the .mkv with rawvideo using any (short) valid video file,
such as an avi:
$ ffmpeg -i goodfile.avi -vcodec rawvideo test.mkv
[See output 1 below]
Next, I convert the mkv, which doesn't play ofcourse, back to
avi:
$ ffmpeg -i test.mkv test.avi
[See output 2 below]
The first step is just for you guys to be able to test this.
I need to be able to pipe uncompressed frames with a timecode
to ffmpeg.exe commandline, and mkv seems one of the only formats
that allows this, as the rest either doesn't have VFR or uncompressed
frames. And no, I cannot use the libs.
Here is '''output 1''', no problems here:
{{{
ffmpeg version git-N-30155-g01a73d6, Copyright (c) 2000-2011 the FFmpeg
developers
built on May 23 2011 03:47:41 with gcc 4.5.3
configuration: --enable-gpl --enable-version3 --enable-memalign-hack
--enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-
frei0r --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-
libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg
--enable-librtmp --enable-libschroedinger --enable-libspeex --enable-
libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-
libxavs --enable-libxvid --enable-zlib --pkg-config=pkg-config
libavutil 51. 2. 1 / 51. 2. 1
libavcodec 53. 6. 0 / 53. 6. 0
libavformat 53. 2. 0 / 53. 2. 0
libavdevice 53. 0. 0 / 53. 0. 0
libavfilter 2. 10. 0 / 2. 10. 0
libswscale 0. 14. 0 / 0. 14. 0
libpostproc 51. 2. 0 / 51. 2. 0
[avi @ 000000000033A0C0] non-interleaved AVI
Input #0, avi, from 'goodfile.avi':
Duration: 00:00:02.54, start: 0.000000, bitrate: 298619 kb/s
Stream #0.0: Video: rawvideo, bgr24, 960x540, 24 tbr, 24 tbn, 24 tbc
[buffer @ 000000000033CD60] w:960 h:540 pixfmt:bgr24 tb:1/1000000 sar:0/1
sws_param:
Output #0, matroska, to 'test.mkv':
Metadata:
encoder : Lavf53.2.0
Stream #0.0: Video: rawvideo, bgr24, 960x540, q=2-31, 200 kb/s, 1k
tbn, 25 tbc
Stream mapping:
Stream #0.0 -> #0.0
Press [q] to stop, [?] for help
frame= 60 fps= 0 q=0.0 size= 91112kB time=2.40
bitrate=310996.0kbits/s
frame= 61 fps= 0 q=0.0 Lsize= 92647kB time=2.44
bitrate=311049.8kbits/s
video:92644kB audio:0kB global headers:0kB muxing overhead 0.003153%
}}}
And here is '''output 2''', the problem:
{{{
ffmpeg version git-N-30155-g01a73d6, Copyright (c) 2000-2011 the FFmpeg
developers
built on May 23 2011 03:47:41 with gcc 4.5.3
configuration: --enable-gpl --enable-version3 --enable-memalign-hack
--enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-
frei0r --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-
libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg
--enable-librtmp --enable-libschroedinger --enable-libspeex --enable-
libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-
libxavs --enable-libxvid --enable-zlib --pkg-config=pkg-config
libavutil 51. 2. 1 / 51. 2. 1
libavcodec 53. 6. 0 / 53. 6. 0
libavformat 53. 2. 0 / 53. 2. 0
libavdevice 53. 0. 0 / 53. 0. 0
libavfilter 2. 10. 0 / 2. 10. 0
libswscale 0. 14. 0 / 0. 14. 0
libpostproc 51. 2. 0 / 51. 2. 0
[matroska,webm @ 00000000003F9F20] Estimating duration from bitrate, this
may be inaccurate
Input #0, matroska,webm, from 'test.mkv':
Metadata:
ENCODER : Lavf53.2.0
Duration: 00:00:02.44, start: 0.000000, bitrate: N/A
Stream #0.0: Video: rawvideo, 960x540, PAR 1:1 DAR 16:9, 25 fps, 25
tbr, 1k tbn, 25 tbc (default)
[buffer @ 00000000003F8E80] Invalid pixel format string '-1'
Error opening filters!
}}}
Now, I realize that there is nowhere in the file stored what the pixel
format is. Even when I specify -pix_fmt rgb24 I get this error.
Also, according to the specs (
http://www.matroska.org/technical/specs/index.html ) there is a
ColourSpace field that might be used
but is not written.
Btw if there is a workaround to this by specifying internal filters like
-vf buffer or something in the mean time (I tried..), I'd appreciate it;)
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/252>
FFmpeg <http://ffmpeg.org>
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