USMAN AAMER wrote > Hi, > > I am comparing the compression efficiency of H.264 and H.265 codecs. > I have studied many research papers showing that the compression > efficiency > of H.265 is much better than H.264. > > But I am not able to get the same results. > I am trying to compress 664 YUV 4:2:0 video sequence with ffmpeg under > H.264 and H.265 codecs and got the resultant videos of following sizes: > H.264: 5.58 MB > H.265: 6.66 MB > > I am using the following commands for compression: > H.264: > ffmpeg -i video.y4m -c:v libx264 -an -strict experimental -preset slow > -CRF > 30 - b:v 800k -f mp4 output.mp4 > > and for H.265: > ffmpeg -i video.y4m -c:v libx265 -an -strict experimental -preset slow > -CRF 30 - b:v 800k -f mp4 output1.mp4 > > Kindly tell me what is the issue. Waiting for the kind response. > > Thank you.
For libx264 and libx265: CRF and bitrate encoding (-b:v) are mutually exclusive methods of rate control; yet you have specified both "Compression efficiency" implies some measure of quality at a given bitrate. Higher compression efficiency implies higher quality at a given bitrate. But you have no measure of quality. And you have different bitrates. -- Sent from: http://ffmpeg-users.933282.n4.nabble.com/ _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
