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August 2011

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#265(swscale:new): MMX2 yuv420p10 → yuv444p scaler produces vertical undithered(?) lines with GCC 4.6
by FFmpeg 02 Aug '11

02 Aug '11

#265: MMX2 yuv420p10 → yuv444p scaler produces vertical undithered(?) lines with GCC 4.6 ----------------------+-------------------------------------- Reporter: lachs0r | Owner: michael Type: defect | Status: new Priority: normal | Component: swscale Version: git | Keywords: yuv420p10, yuv444p, mmx2 Blocked By: | Blocking: Reproduced: 0 | Analyzed: 0 ----------------------+-------------------------------------- I know this might be a PITA to reproduce since it only happens with GCC 4.6, but I’ll report it anyway. Background: I’ve been trying to play yuv420p10 video with my patched MPlayer2 builds for Windows (http://mplayer2.srsfckn.biz/mplayer2-high- bit-depth-latest.7z). MPlayer2 apparently chooses the yuv420p10 → yuv444p scaler by default. That is probably fine, but there’s a problem: The MMX2 version of that scaler seems to break with GCC 4.6.0, causing vertical lines of what seems to be undithered luma (can’t tell for sure since I didn’t actually investigate that in detail, but I’ll attach a screenshot). The C version works fine. This can be reproduced with for example: ffmpeg -i test10bit.mkv -pix_fmt yuv444p -vcodec ffv1 out.mkv -- Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/265> FFmpeg <http://ffmpeg.org> FFmpeg issue tracker

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#376(FFmpeg:new): Problem with converting from avi to avi
by FFmpeg 02 Aug '11

02 Aug '11

#376: Problem with converting from avi to avi -------------------------+--------------------- Reporter: alexxz | Owner: michael Type: defect | Status: new Priority: normal | Component: FFmpeg Version: git-master | Keywords: Blocked By: | Blocking: Reproduced: 0 | Analyzed: 0 -------------------------+--------------------- I was converting series when get a problem. 1 avi from 20 files do not want to be converted. I get empty file on output. I do not really know what is wrong or what should I do {{{ alexxz@kkkkkkkkk:~/work/temp$ /server/ffmpeg/bin/ffmpeg -y -v 9 -loglevel 99 -i example.avi -s 400x240 -vcodec mpeg4 -b 500k -ab 128000 -ar 24000 -acodec libmp3lame -ac 2 out.avi ffmpeg version N-31716-g318fd9d, Copyright (c) 2000-2011 the FFmpeg developers built on Aug 1 2011 15:54:15 with gcc 4.5.2 configuration: --enable-gpl --enable-version3 --enable-nonfree --enable- postproc --enable-pthreads --enable-libfaac --enable-libfaac --enable- libmp3lame --enable-libxvid --prefix=/server/ffmpeg libavutil 51. 11. 1 / 51. 11. 1 libavcodec 53. 9. 0 / 53. 9. 0 libavformat 53. 6. 0 / 53. 6. 0 libavdevice 53. 2. 0 / 53. 2. 0 libavfilter 2. 27. 5 / 2. 27. 5 libswscale 2. 0. 0 / 2. 0. 0 libpostproc 51. 2. 0 / 51. 2. 0 [avi @ 0x9232380] Format avi probed with size=2048 and score=100 [AVI demuxer @ 0x92328a0] use odml:1 [mpeg4 @ 0x92341e0] Invalid and inefficient vfw-avi packed B frames detected [avi @ 0x9232380] All info found Seems stream 0 codec frame rate differs from container frame rate: 23.98 (65535/2733) -> 23.98 (8000000/333649) Input #0, avi, from 'example.avi': Duration: 00:23:40.46, start: 0.000000, bitrate: 1077 kb/s Stream #0.0, 1, 333649/8000000: Video: mpeg4 (Advanced Simple Profile), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 911/21845, 23.98 tbr, 23.98 tbn, 23.98 tbc Stream #0.1, 19, 1/15963: Audio: mp3, 44100 Hz, stereo, s16, 128 kb/s [buffer @ 0x9234160] w:640 h:480 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param: [scale @ 0x924efa0] w:640 h:480 fmt:yuv420p -> w:400 h:240 fmt:yuv420p flags:0x4 [mpeg4 @ 0x9233cc0] timebase 333649/8000000 not supported by MPEG 4 standard, the maximum admitted value for the timebase denominator is 65535 Output #0, avi, to 'out.avi': Stream #0.0, 0, 1/90000: Video: mpeg4, yuv420p, 400x240 [SAR 1:1 DAR 5:3], 333649/8000000, q=2-31, 500 kb/s, 90k tbn, 23.98 tbc Stream #0.1, 0, 1/90000: Audio: libmp3lame, 24000 Hz, 2 channels, s16, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height }}} Also I think line "Seems stream 0 codec frame rate differs from container frame rate: 23.98 (65535/2733) -> 23.98 (8000000/333649)" is very fun. -- Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/376> FFmpeg <http://ffmpeg.org> FFmpeg issue tracker

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