Hi,
ocr is new in ffmpeg 4.0. 1) I build ffmpeg 4.0 and its tesseract-3.05.01, and copy english training data to /usr/local/share/tessdata/eng.traineddata. I use the following command to run ocr filter in ffmpeg, but fail to find eng.traineddata. But I have set TESSDATA_PREFIX: TESSDATA_PREFIX=/usr/local/share LD_LIBRARY_PATH=/usr/local/lib /usr/local/bin/ffmpeg -f lavfi -i "movie=test_ocr.png, ocr=datapath=tessdata:language=eng, drawgraph=lavfi.ocr.text" test_ocr_out.png ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-16) configuration: --enable-version3 --enable-asm --enable-x86asm --enable-avfilter --disable-static --enable-shared --enable-gpl --enable-nonfree --prefix=/usr/local/ --enable-libvidstab --enable-libass --enable-libfreetype --extra-libs=-lfreetype --enable-libtesseract --enable-libfdk_aac --enable-libmp3lame --enable-libx264 --enable-libopenjpeg --enable-libwebp --enable-libx265 --enable-libvorbis --extra-cflags=-I/usr/local/include --extra-ldflags=-L/usr/local/lib --enable-stripping --enable-libmfx libavutil 56. 14.100 / 56. 14.100 libavcodec 58. 18.100 / 58. 18.100 libavformat 58. 12.100 / 58. 12.100 libavdevice 58. 3.100 / 58. 3.100 libavfilter 7. 16.100 / 7. 16.100 libswscale 5. 1.100 / 5. 1.100 libswresample 3. 1.100 / 3. 1.100 libpostproc 55. 1.100 / 55. 1.100 Error opening data file /tessdata/eng.traineddata Please make sure the TESSDATA_PREFIX environment variable is set to the parent directory of your "tessdata" directory. Failed loading language 'eng' Tesseract couldn't load any languages! [Parsed_ocr_1 @ 0x1e03d80] failed to init tesseract [lavfi @ 0x1df77c0] Error initializing filter 'ocr' with args 'datapath=tessdata:language=eng' movie=test_ocr.png, ocr=datapath=tessdata:language=eng, drawgraph=lavfi.ocr.text: Invalid argument If I set TESSDATA_PREFIX to /usr/local/share/tessdata, the same error occurs: TESSDATA_PREFIX=/usr/local/share/tessdata LD_LIBRARY_PATH=/usr/local/lib /usr/local/bin/ffmpeg -f lavfi -i "movie=test_ocr.png, ocr=datapath=tessdata:language=eng, drawgraph=lavfi.ocr.text" test_ocr_out.png ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-16) configuration: --enable-version3 --enable-asm --enable-x86asm --enable-avfilter --disable-static --enable-shared --enable-gpl --enable-nonfree --prefix=/usr/local/ --enable-libvidstab --enable-libass --enable-libfreetype --extra-libs=-lfreetype --enable-libtesseract --enable-libfdk_aac --enable-libmp3lame --enable-libx264 --enable-libopenjpeg --enable-libwebp --enable-libx265 --enable-libvorbis --extra-cflags=-I/usr/local/include --extra-ldflags=-L/usr/local/lib --enable-stripping --enable-libmfx libavutil 56. 14.100 / 56. 14.100 libavcodec 58. 18.100 / 58. 18.100 libavformat 58. 12.100 / 58. 12.100 libavdevice 58. 3.100 / 58. 3.100 libavfilter 7. 16.100 / 7. 16.100 libswscale 5. 1.100 / 5. 1.100 libswresample 3. 1.100 / 3. 1.100 libpostproc 55. 1.100 / 55. 1.100 Error opening data file /tessdata/eng.traineddata Please make sure the TESSDATA_PREFIX environment variable is set to the parent directory of your "tessdata" directory. Failed loading language 'eng' Tesseract couldn't load any languages! [Parsed_ocr_1 @ 0x18a8d80] failed to init tesseract [lavfi @ 0x189c7c0] Error initializing filter 'ocr' with args 'datapath=tessdata:language=eng' movie=test_ocr.png, ocr=datapath=tessdata:language=eng, drawgraph=lavfi.ocr.text: Invalid argument If I use /usr/local/bin/tesseract to do the ocr task, there is no problem. Why ffmpeg and tesseract-3.05.01 can't find eng.traineddata? 2) How can I use ocr to parse text from png file, and output the text into some specified txt file? Thanks Regards Andrew _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
