Greetings >> I have some low resolution videos which I like to enhance the quality of. >> I have found the following filters to be useful. >> unsharp and smartblur.
>> I would like to have some other ideas on how to sharpen and enhance video >> files. > You don't say what quality problems you want to address, but some approaches > you can consider: > - proper de-interlacing (or proper interlaced processing) > - frame-rate correction > - exposure correction/contrast enhancement > - colour correction > - debanding > - stabilisation > - denoising I have a set of 2mbit/s videos which I need to stream out to a cable net provider The suggestion is that the present 2Mbit/sec files be converted with the below script ffmpeg -y -i $FILE1.mp4 -preset slower -profile:v main -level 3.1 -s 720x576 -c:v libx264 -r 25000/1000 -b:v 1750k -maxrate:v 1750k -minrate:v 1750k -bufsize:v 350k -color_primaries 1 -color_trc 1 -colorspace 1 -c:a mp2 -b:a 128k -nal-hrd cbr -muxrate 2100k -f mpegts $FILE1.ts this generates the Transport stream files and this works OK I also have a set of 512 Kb/sec files which I also have to stream out to the same provider. This quality is of cause not so good and I would like to enhance them before streaming. This is a link to a sample file. http://www.learntv.lk/video/grade-06/maths/maths-06-04-01-512k.mp4 This video has been shot on a green chroma background and due to lighting weakness, you see a lot of unsharp and blurred edges. The image itself is compressed to a low resolution at which I have also lost a lot of quality. I have tried using ffmpeg -y -i test.mp4 -strict -2 -vf smartblur=1.5:-0.35:-3.5:0.65:0.25:2.0 -f mp4 test5.mp4 and ffmpeg -y -i test.mp4 -strict -2 -vf smartblur=lr=2.00:ls=-0.90:lt=-5.0:cr=0.5:cs=1.0:ct=1.5 -f mp4 test6.mp4 I do get a better result, but the problem I have is, that I do not understand the settings given in these 2 examples. I would like to understand why I do something, but the color space is not an area I have understood well. Any help in understanding this, and suggestions what to do, is very much appreciated. with metta Mettavihari _______________________________________________ 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".
