Hi Claude,
On 28.04.2015 14:37, Claude Heiland-Allen wrote:
> piping PPM streams to avconv can cause image corruption in the
> (unlikely but possible) case that a frame header overlaps the fifo
> block size in such a way that the partial header is almost valid
You might want to try ffmpeg instead, where this problem seems
to be fixed.
> here is a test case that reliably reproduces the bug on my
> system:
If I change avconv to ffmpeg in your test, I get the following:
====8<====
ffmpeg version 2.6.2-1 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.9.2 (Debian 4.9.2-10)
configuration: --prefix=/usr --extra-version=1 --build-suffix=-ffmpeg
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared
--disable-stripping --enable-avresample --enable-avisynth --enable-ladspa
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype
--enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug
--enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse
--enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh
--enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack
--enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab
--enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq
--enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr
--enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --e
n
able-libx265
libavutil 54. 20.100 / 54. 20.100
libavcodec 56. 26.100 / 56. 26.100
libavformat 56. 25.101 / 56. 25.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 11.102 / 5. 11.102
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, image2pipe, from 'pipe:':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: ppm, rgb24, 16x104, 25 fps, 25 tbr, 25 tbn, 25 tbc
Output #0, image2, to 'bug.2EUPKt.out/%d.ppm':
Metadata:
encoder : Lavf56.25.101
Stream #0:0: Video: ppm, rgb24, 16x104, q=2-31, 200 kb/s, 25 fps, 25 tbn,
25 tbc
Metadata:
encoder : Lavc56.26.100 ppm
Stream mapping:
Stream #0:0 -> #0:0 (ppm (native) -> ppm (native))
frame= 50 fps=0.0 q=0.0 Lsize=N/A time=00:00:02.00 bitrate=N/A
video:244kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: unknown
====8<====
I hope this helps you.
Best regards,
Andreas
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