On Wed, Jun 6, 2012 at 5:22 AM, Sampath Subasinghe <susir...@gmail.com>wrote:
> On 06/05/2012 12:28 PM, Carl Eugen Hoyos wrote: > >> Sampath Subasinghe <susiriss@...> writes: >> >> 1. RGB - YUV conversion >>> 2. YUV - RGB conversion >>> >>> Issue is that in the image output from step 2, the right >>> edge of the image is missing, means the pixels are black. >>> >> Is this also reproducible if you use ffmpeg (the application)? >> If yes, please provide a command line and complete, uncut >> console output. >> > Hi Carl, > I was wondering whether this is what you meant. I have the original > image as a ppm image. > then I do, > ffmpeg - i ref.ppm ref.yuv > which outputs following at the command line > > ffmpeg version 0.10.2 Copyright (c) 2000-2012 the FFmpeg developers > built on Apr 27 2012 07:58:14 with gcc 4.4.5 > configuration: --enable-shared --enable-gpl --enable-nonfree > --enable-x11grab --enable-libfaac --enable-libfreetype --enable-libmp3lame > --enable-libx264 --enable-pic > WARNING: library configuration mismatch > avutil configuration: --enable-gpl --enable-nonfree --enable-shared > --disable-ffserver --enable-x11grab --enable-libaacplus --enable-libfaac > --enable-libfreetype --enable-libmp3lame --enable-libx264 --enable-pic > avfilter configuration: --enable-gpl --enable-nonfree --enable-shared > --disable-ffserver --enable-x11grab --enable-libaacplus --enable-libfaac > --enable-libfreetype --enable-libmp3lame --enable-libx264 --enable-pic > swresample configuration: --enable-gpl --enable-nonfree --enable-shared > --disable-ffserver --enable-x11grab --enable-libaacplus --enable-libfaac > --enable-libfreetype --enable-libmp3lame --enable-libx264 --enable-pic > libavutil 51. 35.100 / 51. 47.100 > libavcodec 53. 61.100 / 53. 61.100 > libavformat 53. 32.100 / 53. 32.100 > libavdevice 53. 4.100 / 53. 4.100 > libavfilter 2. 61.100 / 2. 72.100 > libswscale 2. 1.100 / 2. 1.100 > libswresample 0. 6.100 / 0. 11.100 > libpostproc 52. 0.100 / 52. 0.100 > Input #0, image2, from 'ref.ppm': > Duration: 00:00:00.04, start: 0.000000, bitrate: N/A > Stream #0:0: Video: ppm, rgb24, 45x32, 25 tbr, 25 tbn, 25 tbc > [buffer @ 0x1d457a0] w:45 h:32 pixfmt:rgb24 tb:1/1000000 sar:0/1 sws_param: > Output #0, rawvideo, to 'ref.yuv': > Metadata: > encoder : Lavf53.32.100 > Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 45x32, > q=2-31, 200 kb/s, 90k tbn, 25 tbc > Stream mapping: > Stream #0:0 -> #0:0 (ppm -> rawvideo) > Press [q] to stop, [?] for help > frame= 1 fps= 0 q=0.0 Lsize= 4kB time=00:00:00.04 bitrate= > 864.0kbits/s > video:4kB audio:0kB global headers:0kB muxing overhead 0.000000% > ------------------------------**----- > > Which of course has warnings in it. > > Then I do > ffmpeg -i ref.yuv ref.ppm > which outputs following. > ------------------------------**----------- > ffmpeg -i ref.yuv ref.ppm > ffmpeg version 0.10.2 Copyright (c) 2000-2012 the FFmpeg developers > built on Apr 27 2012 07:58:14 with gcc 4.4.5 > configuration: --enable-shared --enable-gpl --enable-nonfree > --enable-x11grab --enable-libfaac --enable-libfreetype --enable-libmp3lame > --enable-libx264 --enable-pic > WARNING: library configuration mismatch > avutil configuration: --enable-gpl --enable-nonfree --enable-shared > --disable-ffserver --enable-x11grab --enable-libaacplus --enable-libfaac > --enable-libfreetype --enable-libmp3lame --enable-libx264 --enable-pic > avfilter configuration: --enable-gpl --enable-nonfree --enable-shared > --disable-ffserver --enable-x11grab --enable-libaacplus --enable-libfaac > --enable-libfreetype --enable-libmp3lame --enable-libx264 --enable-pic > swresample configuration: --enable-gpl --enable-nonfree --enable-shared > --disable-ffserver --enable-x11grab --enable-libaacplus --enable-libfaac > --enable-libfreetype --enable-libmp3lame --enable-libx264 --enable-pic > libavutil 51. 35.100 / 51. 47.100 > libavcodec 53. 61.100 / 53. 61.100 > libavformat 53. 32.100 / 53. 32.100 > libavdevice 53. 4.100 / 53. 4.100 > libavfilter 2. 61.100 / 2. 72.100 > libswscale 2. 1.100 / 2. 1.100 > libswresample 0. 6.100 / 0. 11.100 > libpostproc 52. 0.100 / 52. 0.100 > [IMGUTILS @ 0x7fff69baf6a0] Picture size 0x0 is invalid > [IMGUTILS @ 0x7fff69baf580] Picture size 0x0 is invalid > [rawvideo @ 0x1e8e3a0] decoding for stream 0 failed > [rawvideo @ 0x1e8e3a0] Could not find codec parameters (Video: rawvideo, > yuv420p) > [rawvideo @ 0x1e8e3a0] Estimating duration from bitrate, this may be > inaccurate > ref.yuv: could not find codec parameters > ------------------------------**----------------------- > I know, my command has errors, but I don't have an idea as to how I should > test the scenario you mentioned. Could you please give me a sample command > line? > > thanks. > -Sampath > To read yuv raw image, you must supply the picture size and pixel format on the command line, e.g. ffmpeg -s 45x32 -pix_fmt yuv420p -i ref.yuv ref.ppm Regards, Alex Cohn
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