As a bit of a revision to a previous entry, I have converted the combination bash/python scripts I gave earlier into a single large python script.
This can now be used without editing any files to set sizes. An example of use is:
$ ./enc.py -s 700 -a 192 -o '-deinterlace' da_*.VOB
All of these flags are optional except the file list, where at least 1 file must be specified.
#!/usr/bin/python from getopt import getopt, GetoptError from sys import argv, exit from subprocess import Popen, PIPE from re import search def secs(h, m, s): return (((h*60)+m)*60)+s def calc_video_bitrate(target_bytes, ab, time): audio_bytes = (ab * 1000 / 8) * time return (target_bytes - audio_bytes) / time * 8 def get_duration(file): ffmpeg = Popen(("ffmpeg", "-i", file), stderr=PIPE) match = search("(\\d+):(\\d+):(\\d+)\\.\\d+", ffmpeg.communicate()[1]) ffmpeg.stderr.close() if match == None: return 0 dur = match.groups() return secs(int(dur[0]), int(dur[1]), int(dur[2])) def encode(source, dest, opts, vbr, abr=128): command1 = "ffmpeg -i %s -pass 1 -an -vcodec libx264 -vpre fastfirstpass -b %d -bt %d -threads 0 %s -y pass1.mp4" % (source, vbr, vbr, opts) command2 = "ffmpeg -i %s -pass 2 -acodec libfaac -ac 2 -ab %dk -vcodec libx264 -vpre hq -b %d -bt %d -threads 0 %s -y %s" % (source, abr, vbr, vbr, opts, dest) pass1 = Popen(command1.split()) pass1.wait() pass2 = Popen(command2.split()) pass2.wait() target_size = 350 #MiB ab = 128 #kbps extra_options = "" # Parse args try: opts, args = getopt(argv[1:], "s:a:o:", ["size=", "ab=", "opts="]) except GetoptError, err: print str(err) exit(2) for o, a in opts: if o in ("-s", "--size"): target_size = int(a) * 1024 * 1024 elif o in ("-a", "--ab"): ab = int(a) elif o in ("-o", "--opts"): extra_options = a if len(args) < 1: print "Usage: " + argv[0] + \ " [-s <size (MiB)>] [-a <audio bit rate (kbps)>] [-o <additional options>] <file list>" exit(2) # Loop through files for file in args: duration = get_duration(file) if duration <= 0: print "Unable to get length of", file continue bitrate = calc_video_bitrate(target_size, ab, duration) encode(file, file + ".mp4", extra_options, bitrate, ab)