On Wed, Nov 16, 2016 at 2:54 PM, Moritz Barsnick <[email protected]> wrote: > On Wed, Nov 16, 2016 at 20:12:49 +0100, Carl Eugen Hoyos wrote: >> 2016-11-16 19:50 GMT+01:00 Joel Lopez <[email protected]>: >> > looking at? Do/How I look at the frames? Where do I look to get this >> > non-trivial info? I can script it out once I know where to look. >> >> Forgive me for being unclear: >> It is so difficult that I don't know how to do it and I don't know where >> to look (but I do know that if you were able to do it you wouldn't have >> to ask). >> >> (This is not about finding the biggest frame in a stream afaik, this >> would of course be trivial.) > > I found this information: > > http://ramugedia.com/hls--how-determine-peak-bitrate > (which doesn't point to any source for this info). > > It does look scriptable. It would be more difficult to implement for > ffmpeg, as the hls demuxer would need to keep a memory of each > segment's properties, and do the math at the end, but perhaps not > impossible. > > Moritz > _______________________________________________ > 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".
Thanks Moritz. I found that today too but my eyes glazed over as I looked at the calculation. I think I'll bite the bullet and try to figure it out. I also found this today and it prints out what it says is a peak bitrate. I got it to work on my machine but I'm not sure if it's giving me the same number as Media Stream Validator. http://stackoverflow.com/questions/26220557/how-to-get-h264-bitrate #!/bin/bash # Mimic the output of # mplayer -lavdopts vstats FILE -fps 30 -vo null # Example usage: # ./vstats.sh file.hevc 30 FFPROBE=$HOME/src/ffmpeg/ffprobe fps=$2 # default 30 fps : ${fps:=30} frames=$3 # Numper of frames to process : ${frames:=65536} awk -v FPS="${fps}" -v FRAMES="${frames}" ' BEGIN{ FS="=" } /pkt_size/ { br=$2/1000.0*8*FPS if (br > max_br) max_br=br acc_br+=br acc_bytes+=br i+=1 printf("frame= %6d, f_size= %7d, s_size= %8dkB, br= %8.1fkbits/s, avg_br= %8.1fkbits/s\n", i, $2, int(acc_bytes/1024+0.5), br, acc_br/i) if (i >= FRAMES) exit } END { print "----" printf("Peak BR: %.1fkbits/s", max_br) } ' <(${FFPROBE} -show_frames $1 2>/dev/null) Example output: frame= 1, f_size= 50805, s_size= 12kB, br= 12193.2kbits/s, avg_br= 12193.2kbits/s frame= 2, f_size= 4749, s_size= 13kB, br= 1139.8kbits/s, avg_br= 6666.5kbits/s frame= 3, f_size= 5781, s_size= 14kB, br= 1387.4kbits/s, avg_br= 4906.8kbits/s frame= 4, f_size= 6135, s_size= 16kB, br= 1472.4kbits/s, avg_br= 4048.2kbits/s frame= 5, f_size= 6239, s_size= 17kB, br= 1497.4kbits/s, avg_br= 3538.0kbits/s frame= 6, f_size= 6487, s_size= 19kB, br= 1556.9kbits/s, avg_br= 3207.8kbits/s frame= 7, f_size= 6550, s_size= 20kB, br= 1572.0kbits/s, avg_br= 2974.1kbits/s frame= 8, f_size= 6567, s_size= 22kB, br= 1576.1kbits/s, avg_br= 2799.4kbits/s frame= 9, f_size= 6390, s_size= 23kB, br= 1533.6kbits/s, avg_br= 2658.7kbits/s frame= 10, f_size= 6540, s_size= 25kB, br= 1569.6kbits/s, avg_br= 2549.8kbits/s frame= 11, f_size= 6929, s_size= 27kB, br= 1663.0kbits/s, avg_br= 2469.2kbits/s frame= 12, f_size= 8037, s_size= 28kB, br= 1928.9kbits/s, avg_br= 2424.2kbits/s frame= 13, f_size= 7965, s_size= 30kB, br= 1911.6kbits/s, avg_br= 2384.8kbits/s frame= 14, f_size= 7833, s_size= 32kB, br= 1879.9kbits/s, avg_br= 2348.7kbits/s frame= 15, f_size= 8281, s_size= 34kB, br= 1987.4kbits/s, avg_br= 2324.6kbits/s frame= 16, f_size= 8235, s_size= 36kB, br= 1976.4kbits/s, avg_br= 2302.8kbits/s frame= 17, f_size= 7969, s_size= 38kB, br= 1912.6kbits/s, avg_br= 2279.9kbits/s frame= 18, f_size= 7953, s_size= 40kB, br= 1908.7kbits/s, avg_br= 2259.3kbits/s frame= 19, f_size= 8867, s_size= 42kB, br= 2128.1kbits/s, avg_br= 2252.4kbits/s frame= 20, f_size= 9686, s_size= 44kB, br= 2324.6kbits/s, avg_br= 2256.0kbits/s ---- Peak BR: 12193.2kbits/s _______________________________________________ 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".
