[FFmpeg-user] yuvtestsrc to y4m differs with and without format rgba->yuv444p conversion
Andrew Randrianasulu
randrianasulu at gmail.com
Tue Sep 10 07:33:06 EEST 2024
On Tue, Sep 10, 2024 at 4:09 AM Paul B Mahol <onemda at gmail.com> wrote:
>
> On Sun, Sep 8, 2024 at 8:07 PM Andrew Randrianasulu <randrianasulu at gmail.com>
> wrote:
>
> > On Sun, Sep 8, 2024 at 9:02 PM Paul B Mahol <onemda at gmail.com> wrote:
> > >
> > > On Sun, Sep 8, 2024 at 7:49 AM Andrew Randrianasulu <
> > randrianasulu at gmail.com>
> > > wrote:
> > >
> > > > git up to d9f594209fb1a9c87017034f943dcb311a9d2896
> > > >
> > > > first command
> > > > ====
> > > >
> > > > bash-5.1$ /dev/shm/ffmpeg/ffmpeg -f lavfi -i yuvtestsrc -frames 1 -r
> > > > 25 -vf format=rgba,format=yuv444p -color_range 1
> > > > /dev/shm/yuv-mpeg-rgba-yuv444p.y4m -debug log
> > > > ffmpeg version N-115688-gd9f594209f Copyright (c) 2000-2024 the FFmpeg
> > > > developers
> > > > built with gcc 11.2.0 (GCC)
> > > > configuration: --disable-debug
> > > > libavutil 59. 35.100 / 59. 35.100
> > > > libavcodec 61. 11.100 / 61. 11.100
> > > > libavformat 61. 5.101 / 61. 5.101
> > > > libavdevice 61. 2.100 / 61. 2.100
> > > > libavfilter 10. 2.102 / 10. 2.102
> > > > libswscale 8. 2.100 / 8. 2.100
> > > > libswresample 5. 2.100 / 5. 2.100
> > > > matched as AVOption 'debug' with argument 'log'.
> > > > Trailing option(s) found in the command: may be ignored.
> > > > Finished splitting the commandline.
> > > > Parsing a group of options: global .
> > > > Successfully parsed a group of options.
> > > > Parsing a group of options: input url yuvtestsrc.
> > > > Applying option f (force container format (auto-detected otherwise))
> > > > with argument lavfi.
> > > > Successfully parsed a group of options.
> > > > Opening an input file: yuvtestsrc.
> > > > detected 4 logical cores
> > > > [Parsed_yuvtestsrc_0 @ 0xb8276c0] size:320x240 rate:25/1
> > > > duration:-1.000000 sar:1/1
> > > > [AVFilterGraph @ 0xb826f00] query_formats: 2 queried, 3 merged, 0
> > > > already done, 0 delayed
> > > > [lavfi @ 0xb826840] All info found
> > > > Input #0, lavfi, from 'yuvtestsrc':
> > > > Duration: N/A, start: 0.000000, bitrate: N/A
> > > > Stream #0:0, 1, 1/25: Video: wrapped_avframe, 1 reference frame,
> > > > yuv444p, 320x240 [SAR 1:1 DAR 4:3], 0/1, 25 fps, 25 tbr, 25 tbn
> > > > Successfully opened the file.
> > > > Parsing a group of options: output url
> > /dev/shm/yuv-mpeg-rgba-yuv444p.y4m.
> > > > Applying option frames (set the number of frames to output) with
> > argument
> > > > 1.
> > > > Applying option r (override input framerate/convert to given output
> > > > framerate (Hz value, fraction or abbreviation)) with argument 25.
> > > > Applying option vf (alias for -filter:v (apply filters to video
> > > > streams)) with argument format=rgba,format=yuv444p.
> > > > Successfully parsed a group of options.
> > > > Opening an output file: /dev/shm/yuv-mpeg-rgba-yuv444p.y4m.
> > > > [out#0/yuv4mpegpipe @ 0xb863900] No explicit maps, mapping streams
> > > > automatically...
> > > > [vost#0:0/wrapped_avframe @ 0xb864080] Created video stream from input
> > > > stream 0:0
> > > > [AVFilterGraph @ 0xb865680] Setting 'pix_fmts' to value 'rgba'
> > > > [AVFilterGraph @ 0xb865680] Setting 'pix_fmts' to value 'yuv444p'
> > > > File '/dev/shm/yuv-mpeg-rgba-yuv444p.y4m' already exists. Overwrite?
> > [y/N]
> > > > y
> > > > [file @ 0xb862600] Setting default whitelist 'file,crypto,data'
> > > > Successfully opened the file.
> > > > Stream mapping:
> > > > Stream #0:0 -> #0:0 (wrapped_avframe (native) -> wrapped_avframe
> > > > (native))
> > > > [vost#0:0/wrapped_avframe @ 0xb864080] Starting thread...
> > > > [vf#0:0 @ 0xb865300] Starting thread...
> > > > [vist#0:0/wrapped_avframe @ 0xb8632c0] [dec:wrapped_avframe @
> > > > 0xb866f80] Starting thread...
> > > > [in#0/lavfi @ 0xb8265c0] Starting thread...
> > > > Press [q] to stop, [?] for help
> > > > [AVFilterGraph @ 0xf3900a40] Setting 'pix_fmts' to value 'rgba'
> > > > [AVFilterGraph @ 0xf3900a40] Setting 'pix_fmts' to value 'yuv444p'
> > > > [graph -1 input from stream 0:0 @ 0xf3901f80] Setting 'video_size' to
> > > > value '320x240'
> > > > [graph -1 input from stream 0:0 @ 0xf3901f80] Setting 'pix_fmt' to
> > value
> > > > '5'
> > > > [graph -1 input from stream 0:0 @ 0xf3901f80] Setting 'time_base' to
> > > > value '1/25'
> > > > [graph -1 input from stream 0:0 @ 0xf3901f80] Setting 'pixel_aspect'
> > > > to value '1/1'
> > > > [graph -1 input from stream 0:0 @ 0xf3901f80] Setting 'colorspace' to
> > > > value '2'
> > > > [graph -1 input from stream 0:0 @ 0xf3901f80] Setting 'range' to value
> > '0'
> > > > [graph -1 input from stream 0:0 @ 0xf3901f80] Setting 'frame_rate' to
> > > > value '25/1'
> > > > [graph -1 input from stream 0:0 @ 0xf3901f80] w:320 h:240
> > > > pixfmt:yuv444p tb:1/25 fr:25/1 sar:1/1 csp:unknown range:unknown
> > > > [auto_scale_0 @ 0xf3903d80] w:iw h:ih flags:'' interl:0
> > > > [Parsed_format_0 @ 0xf39015c0] auto-inserting filter 'auto_scale_0'
> > > > between the filter 'graph -1 input from stream 0:0' and the filter
> > > > 'Parsed_format_0'
> > > > [auto_scale_1 @ 0xf390e940] w:iw h:ih flags:'' interl:0
> > > > [Parsed_format_1 @ 0xf39018c0] auto-inserting filter 'auto_scale_1'
> > > > between the filter 'Parsed_format_0' and the filter 'Parsed_format_1'
> > > > [AVFilterGraph @ 0xf3900a40] query_formats: 4 queried, 3 merged, 6
> > > > already done, 0 delayed
> > > > [swscaler @ 0xf3919040] [swscaler @ 0xf3922480] Forcing full internal
> > > > H chroma due to input having non subsampled chroma
> > > > [swscaler @ 0xf3919040] [swscaler @ 0xf393c140] Forcing full internal
> > > > H chroma due to input having non subsampled chroma
> > > > [swscaler @ 0xf3919040] [swscaler @ 0xf3955600] Forcing full internal
> > > > H chroma due to input having non subsampled chroma
> > > > [swscaler @ 0xf3919040] [swscaler @ 0xf396f2c0] Forcing full internal
> > > > H chroma due to input having non subsampled chroma
> > > > [swscaler @ 0xf3919040] [swscaler @ 0xf3988780] Forcing full internal
> > > > H chroma due to input having non subsampled chroma
> > > > [auto_scale_0 @ 0xf3903d80] w:320 h:240 fmt:yuv444p csp:unknown
> > > > range:unknown sar:1/1 -> w:320 h:240 fmt:rgba csp:gbr range:pc sar:1/1
> > > > flags:0x00000004
> > > > [auto_scale_0 @ 0xf3903d80] [framesync @ 0xf3903e14] Selected 1/25 time
> > > > base
> > > > [auto_scale_0 @ 0xf3903d80] [framesync @ 0xf3903e14] Sync level 1
> > > > [auto_scale_1 @ 0xf390e940] w:320 h:240 fmt:rgba csp:gbr range:pc
> > > > sar:1/1 -> w:320 h:240 fmt:yuv444p csp:unknown range:unknown sar:1/1
> > > > flags:0x00000004
> > > > [auto_scale_1 @ 0xf390e940] [framesync @ 0xf390ea14] Selected 1/25 time
> > > > base
> > > > [auto_scale_1 @ 0xf390e940] [framesync @ 0xf390ea14] Sync level 1
> > > > [graph -1 input from stream 0:0 @ 0xf3901f80] video frame properties
> > > > congruent with link at pts_time: 0
> > > > Output #0, yuv4mpegpipe, to '/dev/shm/yuv-mpeg-rgba-yuv444p.y4m':
> > > > Metadata:
> > > > encoder : Lavf61.5.101
> > > > Stream #0:0, 0, 1/25: Video: wrapped_avframe, 1 reference frame,
> > > > yuv444p(progressive), 320x240 [SAR 1:1 DAR 4:3], 0/1, q=2-31, 200
> > > > kb/s, 25 fps, 25 tbn
> > > > Metadata:
> > > > encoder : Lavc61.11.100 wrapped_avframe
> > > > [out#0/yuv4mpegpipe @ 0xb863900] Starting thread...
> > > > [out#0/yuv4mpegpipe @ 0xb863900] sq: send 0 ts 0.04
> > > > [out#0/yuv4mpegpipe @ 0xb863900] sq: 0 frames_max 1 reached
> > > > [out#0/yuv4mpegpipe @ 0xb863900] sq: finish 0; head ts 0.04
> > > > [out#0/yuv4mpegpipe @ 0xb863900] sq: finish queue
> > > > [out#0/yuv4mpegpipe @ 0xb863900] sq: receive 0 ts 0.04 queue head 0 ts
> > 0.04
> > > > [vf#0:0 @ 0xb865300] All consumers returned EOF
> > > > [vost#0:0/wrapped_avframe @ 0xb864080] Encoder thread received EOF
> > > > [vost#0:0/wrapped_avframe @ 0xb864080] Terminating thread with return
> > > > code 0 (success)
> > > > [out#0/yuv4mpegpipe @ 0xb863900] All streams finished
> > > > [out#0/yuv4mpegpipe @ 0xb863900] Terminating thread with return code 0
> > > > (success)
> > > > [out#0/yuv4mpegpipe @ 0xb863900] sq: 0 EOF
> > > > [out#0/yuv4mpegpipe @ 0xb863900] sq: finish queue
> > > > [vf#0:0 @ 0xb865300] Terminating thread with return code 0 (success)
> > > > [vist#0:0/wrapped_avframe @ 0xb8632c0] [dec:wrapped_avframe @
> > > > 0xb866f80] Decoder returned EOF, finishing
> > > > [vist#0:0/wrapped_avframe @ 0xb8632c0] [dec:wrapped_avframe @
> > > > 0xb866f80] Terminating thread with return code 0 (success)
> > > > [vist#0:0/wrapped_avframe @ 0xb8632c0] All consumers of this stream are
> > > > done
> > > > [in#0/lavfi @ 0xb8265c0] All consumers are done
> > > > [in#0/lavfi @ 0xb8265c0] Terminating thread with return code 0
> > (success)
> > > > [AVIOContext @ 0xb865940] Statistics: 230456 bytes written, 0 seeks, 1
> > > > writeouts
> > > > [out#0/yuv4mpegpipe @ 0xb863900] Output file #0
> > > > (/dev/shm/yuv-mpeg-rgba-yuv444p.y4m):
> > > > [out#0/yuv4mpegpipe @ 0xb863900] Output stream #0:0 (video): 1
> > > > frames encoded; 1 packets muxed (308 bytes);
> > > > [out#0/yuv4mpegpipe @ 0xb863900] Total: 1 packets (308 bytes) muxed
> > > > [out#0/yuv4mpegpipe @ 0xb863900] video:0KiB audio:0KiB subtitle:0KiB
> > > > other streams:0KiB global headers:0KiB muxing overhead: 74723.376623%
> > > > frame= 1 fps=0.0 q=-0.0 Lsize= 225KiB time=00:00:00.04
> > > > bitrate=46091.2kbits/s speed=3.17x
> > > > [in#0/lavfi @ 0xb8265c0] Input file #0 (yuvtestsrc):
> > > > [in#0/lavfi @ 0xb8265c0] Input stream #0:0 (video): 19 packets read
> > > > (5852 bytes); 10 frames decoded; 0 decode errors;
> > > > [in#0/lavfi @ 0xb8265c0] Total: 19 packets (5852 bytes) demuxed
> > > >
> > > > =======
> > > >
> > > > second command
> > > >
> > > > bash-5.1$ /dev/shm/ffmpeg/ffmpeg -f lavfi -i yuvtestsrc -frames 1 -r
> > > > 25 -color_range 1 /dev/shm/yuv-mpeg-yuv444p.y4m -debug log
> > > > ffmpeg version N-115688-gd9f594209f Copyright (c) 2000-2024 the FFmpeg
> > > > developers
> > > > built with gcc 11.2.0 (GCC)
> > > > configuration: --disable-debug
> > > > libavutil 59. 35.100 / 59. 35.100
> > > > libavcodec 61. 11.100 / 61. 11.100
> > > > libavformat 61. 5.101 / 61. 5.101
> > > > libavdevice 61. 2.100 / 61. 2.100
> > > > libavfilter 10. 2.102 / 10. 2.102
> > > > libswscale 8. 2.100 / 8. 2.100
> > > > libswresample 5. 2.100 / 5. 2.100
> > > > matched as AVOption 'debug' with argument 'log'.
> > > > Trailing option(s) found in the command: may be ignored.
> > > > Finished splitting the commandline.
> > > > Parsing a group of options: global .
> > > > Successfully parsed a group of options.
> > > > Parsing a group of options: input url yuvtestsrc.
> > > > Applying option f (force container format (auto-detected otherwise))
> > > > with argument lavfi.
> > > > Successfully parsed a group of options.
> > > > Opening an input file: yuvtestsrc.
> > > > detected 4 logical cores
> > > > [Parsed_yuvtestsrc_0 @ 0xb0fc640] size:320x240 rate:25/1
> > > > duration:-1.000000 sar:1/1
> > > > [AVFilterGraph @ 0xb0fbec0] query_formats: 2 queried, 3 merged, 0
> > > > already done, 0 delayed
> > > > [lavfi @ 0xb0fb800] All info found
> > > > Input #0, lavfi, from 'yuvtestsrc':
> > > > Duration: N/A, start: 0.000000, bitrate: N/A
> > > > Stream #0:0, 1, 1/25: Video: wrapped_avframe, 1 reference frame,
> > > > yuv444p, 320x240 [SAR 1:1 DAR 4:3], 0/1, 25 fps, 25 tbr, 25 tbn
> > > > Successfully opened the file.
> > > > Parsing a group of options: output url /dev/shm/yuv-mpeg-yuv444p.y4m.
> > > > Applying option frames (set the number of frames to output) with
> > argument
> > > > 1.
> > > > Applying option r (override input framerate/convert to given output
> > > > framerate (Hz value, fraction or abbreviation)) with argument 25.
> > > > Successfully parsed a group of options.
> > > > Opening an output file: /dev/shm/yuv-mpeg-yuv444p.y4m.
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] No explicit maps, mapping streams
> > > > automatically...
> > > > [vost#0:0/wrapped_avframe @ 0xb138f40] Created video stream from input
> > > > stream 0:0
> > > > File '/dev/shm/yuv-mpeg-yuv444p.y4m' already exists. Overwrite? [y/N] y
> > > > [file @ 0xb13a600] Setting default whitelist 'file,crypto,data'
> > > > Successfully opened the file.
> > > > Stream mapping:
> > > > Stream #0:0 -> #0:0 (wrapped_avframe (native) -> wrapped_avframe
> > > > (native))
> > > > [vost#0:0/wrapped_avframe @ 0xb138f40] Starting thread...
> > > > [vf#0:0 @ 0xb13a1c0] Starting thread...
> > > > [vist#0:0/wrapped_avframe @ 0xb138180] [dec:wrapped_avframe @
> > > > 0xb13b5c0] Starting thread...
> > > > [in#0/lavfi @ 0xb0fb580] Starting thread...
> > > > Press [q] to stop, [?] for help
> > > > [graph -1 input from stream 0:0 @ 0xf41016c0] Setting 'video_size' to
> > > > value '320x240'
> > > > [graph -1 input from stream 0:0 @ 0xf41016c0] Setting 'pix_fmt' to
> > value
> > > > '5'
> > > > [graph -1 input from stream 0:0 @ 0xf41016c0] Setting 'time_base' to
> > > > value '1/25'
> > > > [graph -1 input from stream 0:0 @ 0xf41016c0] Setting 'pixel_aspect'
> > > > to value '1/1'
> > > > [graph -1 input from stream 0:0 @ 0xf41016c0] Setting 'colorspace' to
> > > > value '2'
> > > > [graph -1 input from stream 0:0 @ 0xf41016c0] Setting 'range' to value
> > '0'
> > > > [graph -1 input from stream 0:0 @ 0xf41016c0] Setting 'frame_rate' to
> > > > value '25/1'
> > > > [graph -1 input from stream 0:0 @ 0xf41016c0] w:320 h:240
> > > > pixfmt:yuv444p tb:1/25 fr:25/1 sar:1/1 csp:unknown range:unknown
> > > > [AVFilterGraph @ 0xf4100a40] query_formats: 3 queried, 6 merged, 0
> > > > already done, 0 delayed
> > > > [graph -1 input from stream 0:0 @ 0xf41016c0] video frame properties
> > > > congruent with link at pts_time: 0
> > > > Output #0, yuv4mpegpipe, to '/dev/shm/yuv-mpeg-yuv444p.y4m':
> > > > Metadata:
> > > > encoder : Lavf61.5.101
> > > > Stream #0:0, 0, 1/25: Video: wrapped_avframe, 1 reference frame,
> > > > yuv444p(progressive), 320x240 [SAR 1:1 DAR 4:3], 0/1, q=2-31, 200
> > > > kb/s, 25 fps, 25 tbn
> > > > Metadata:
> > > > encoder : Lavc61.11.100 wrapped_avframe
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] Starting thread...
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] sq: send 0 ts 0.04
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] sq: 0 frames_max 1 reached
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] sq: finish 0; head ts 0.04
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] sq: finish queue
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] sq: receive 0 ts 0.04 queue head 0 ts
> > 0.04
> > > > [vf#0:0 @ 0xb13a1c0] All consumers returned EOF
> > > > [vost#0:0/wrapped_avframe @ 0xb138f40] Encoder thread received EOF
> > > > [vost#0:0/wrapped_avframe @ 0xb138f40] Terminating thread with return
> > > > code 0 (success)
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] sq: 0 EOF
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] sq: finish queue
> > > > [vf#0:0 @ 0xb13a1c0] Terminating thread with return code 0 (success)
> > > > [vist#0:0/wrapped_avframe @ 0xb138180] [dec:wrapped_avframe @
> > > > 0xb13b5c0] Decoder returned EOF, finishing
> > > > [vist#0:0/wrapped_avframe @ 0xb138180] [dec:wrapped_avframe @
> > > > 0xb13b5c0] Terminating thread with return code 0 (success)
> > > > [vist#0:0/wrapped_avframe @ 0xb138180] All consumers of this stream are
> > > > done
> > > > [in#0/lavfi @ 0xb0fb580] All consumers are done
> > > > [in#0/lavfi @ 0xb0fb580] Terminating thread with return code 0
> > (success)
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] All streams finished
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] Terminating thread with return code 0
> > > > (success)
> > > > [AVIOContext @ 0xb13a900] Statistics: 230456 bytes written, 0 seeks, 1
> > > > writeouts
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] Output file #0
> > > > (/dev/shm/yuv-mpeg-yuv444p.y4m):
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] Output stream #0:0 (video): 1
> > > > frames encoded; 1 packets muxed (308 bytes);
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] Total: 1 packets (308 bytes) muxed
> > > > [out#0/yuv4mpegpipe @ 0xb1387c0] video:0KiB audio:0KiB subtitle:0KiB
> > > > other streams:0KiB global headers:0KiB muxing overhead: 74723.376623%
> > > > frame= 1 fps=0.0 q=-0.0 Lsize= 225KiB time=00:00:00.04
> > > > bitrate=46091.2kbits/s speed=9.67x
> > > > [in#0/lavfi @ 0xb0fb580] Input file #0 (yuvtestsrc):
> > > > [in#0/lavfi @ 0xb0fb580] Input stream #0:0 (video): 19 packets read
> > > > (5852 bytes); 10 frames decoded; 0 decode errors;
> > > > [in#0/lavfi @ 0xb0fb580] Total: 19 packets (5852 bytes) demuxed
> > > >
> > > > resulting files differ significally at the end of each bar in
> > > > YUVViewer and in cingg with Subtract mode ( I am debugging our
> > > > colorspace problem)
> > > >
> > > > /dev/shm/ffmpeg/ffprobe /dev/shm/yuv-mpeg-rgba-yuv444p.y4m
> > > > ffprobe version N-115688-gd9f594209f Copyright (c) 2007-2024 the
> > > > FFmpeg developers
> > > > built with gcc 11.2.0 (GCC)
> > > > configuration: --disable-debug
> > > > libavutil 59. 35.100 / 59. 35.100
> > > > libavcodec 61. 11.100 / 61. 11.100
> > > > libavformat 61. 5.101 / 61. 5.101
> > > > libavdevice 61. 2.100 / 61. 2.100
> > > > libavfilter 10. 2.102 / 10. 2.102
> > > > libswscale 8. 2.100 / 8. 2.100
> > > > libswresample 5. 2.100 / 5. 2.100
> > > > Input #0, yuv4mpegpipe, from '/dev/shm/yuv-mpeg-rgba-yuv444p.y4m':
> > > > Duration: 00:00:00.04, start: 0.000000, bitrate: 46091 kb/s
> > > > Stream #0:0: Video: rawvideo (444P / 0x50343434),
> > > > yuv444p(progressive), 320x240, SAR 1:1 DAR 4:3, 25 fps, 25 tbr, 25 tbn
> > > >
> > > > =========
> > > >
> > > > /dev/shm/ffmpeg/ffprobe /dev/shm/yuv-mpeg-yuv444p.y4m
> > > > ffprobe version N-115688-gd9f594209f Copyright (c) 2007-2024 the
> > > > FFmpeg developers
> > > > built with gcc 11.2.0 (GCC)
> > > > configuration: --disable-debug
> > > > libavutil 59. 35.100 / 59. 35.100
> > > > libavcodec 61. 11.100 / 61. 11.100
> > > > libavformat 61. 5.101 / 61. 5.101
> > > > libavdevice 61. 2.100 / 61. 2.100
> > > > libavfilter 10. 2.102 / 10. 2.102
> > > > libswscale 8. 2.100 / 8. 2.100
> > > > libswresample 5. 2.100 / 5. 2.100
> > > > Input #0, yuv4mpegpipe, from '/dev/shm/yuv-mpeg-yuv444p.y4m':
> > > > Duration: 00:00:00.04, start: 0.000000, bitrate: 46091 kb/s
> > > > Stream #0:0: Video: rawvideo (444P / 0x50343434),
> > > > yuv444p(progressive), 320x240, SAR 1:1 DAR 4:3, 25 fps, 25 tbr, 25 tbn
> > > >
> > > >
> > > > Is this known problem? I see some range flags for swscaler not set,
> > > > may be this is root of problem?
> > > >
> > >
> > > Conversion within discrete and limited precision values from
> > yuv->rgb->yuv
> > > is not lossless.
> >
> > But why I see BIG colored (at the edges, with increasing difference)
> > bars, instead of random +/- 1 all over the picture ?
> >
>
> because one should be PC range and another TV range YUV.
I was trying full range yuv (because cinelerra-gg can be configured this way).
But may be my self-compile of YUViewer was glitching - I tried to
write same conversion in two steps with bmp file and it worked.
Tried to jiggle all 3 files in YUViewer and two y4m finally aligned
properly ....
>
>
> >
> > >
> > >
> > > > _______________________________________________
> > > > ffmpeg-user mailing list
> > > > ffmpeg-user at ffmpeg.org
> > > > https://ffmpeg.org/mailman/listinfo/ffmpeg-user
> > > >
> > > > To unsubscribe, visit link above, or email
> > > > ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
> > > >
> > > _______________________________________________
> > > ffmpeg-user mailing list
> > > ffmpeg-user at ffmpeg.org
> > > https://ffmpeg.org/mailman/listinfo/ffmpeg-user
> > >
> > > To unsubscribe, visit link above, or email
> > > ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
> > _______________________________________________
> > ffmpeg-user mailing list
> > ffmpeg-user at ffmpeg.org
> > https://ffmpeg.org/mailman/listinfo/ffmpeg-user
> >
> > To unsubscribe, visit link above, or email
> > ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
> >
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
More information about the ffmpeg-user
mailing list