[FFmpeg-devel] filter vf_findandcover

[Michael Niedermayer]

On Wed, Apr 29, 2015 at 09:58:55PM +0000, JULIAN GARDNER wrote:
> Just thought i would give this a test and took a video i had, cropped a static bit from the picture, using gimp, and tried to run this.
> but I have the same problem as one of my own filters, png decode does not work, well not with a png generated with gimp.
> anybody know how to export a VALID png file.
> 
> command line and output
> encoder at encoder:~/ffmpeg$ ./ffmpeg -i /home/encoder/dumps/stream.ts -vf 'scale=640:360,foc=object=ball.png' -y -f mpegts a.ts
> ffmpeg version N-69739-gbc3514b Copyright (c) 2000-2015 the FFmpeg developers
>   built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
>   configuration: --bindir=/home/encoder/bin --enable-gpl --enable-version3 --enable-nonfree --disable-ffserver --disable-dxva2 --disable-vaapi --disable-vda --disable-vdpau --disable-libxcb --enable-libmp3lame --enable-postproc --enable-libfaac --enable-libzvbi --enable-libx264 --enable-libx265 --cc='ccache cc'
>   libavutil      54. 18.100 / 54. 18.100
>   libavcodec     56. 21.102 / 56. 21.102
>   libavformat    56. 19.101 / 56. 19.101
>   libavdevice    56.  4.100 / 56.  4.100
>   libavfilter     5. 10.100 /  5. 10.100
>   libswscale      3.  1.101 /  3.  1.101
>   libswresample   1.  1.100 /  1.  1.100
>   libpostproc    53.  3.100 / 53.  3.100
> [mpegts @ 0x25ce1a0] New SDT(0x0011) Table, version 255 to 0
> [mpegts @ 0x25ce1a0] New PMT(0x0040) Table, version 255 to 0
> Input #0, mpegts, from '/home/encoder/dumps/stream.ts':
>   Duration: 00:15:00.04, start: 8526.864000, bitrate: 9900 kb/s
>   Program 48 
>     Metadata:
>       service_name    : DTV3
>       service_provider: 
>     Stream #0:0[0x41]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 100 tbc
>     Stream #0:1[0x42]: Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, stereo, s16p, 128 kb/s
> [png @ 0x260cda0] PNG2
> [png @ 0x260cda0] PNG3
> [Parsed_foc_1 @ 0x260b640] Failed to decode image from file
> [png @ 0x25c2a60] PNG2
> [png @ 0x25c2a60] PNG3
> [Parsed_foc_1 @ 0x260b640] Error loading image file 'ball.png'
> [AVFilterGraph @ 0x25d31a0] Error initializing filter 'foc' with args 'object=ball.png'
> Error opening filters!

the object file must be gray8 colorspace
i used a .pgm

ill fix the code to produce a better error message and document that

thanks

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The educated differ from the uneducated as much as the living from the
dead. -- Aristotle 
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