On Wed, Jun 4, 2014 at 5:32 AM, Vijay Kanta <[email protected]> wrote:
> Hey guys, > > I found out it's the H264 encoding that is really screwing up the cpu > cycles, and not the audio. @carl, moving it down didn't help, it still says > invalid command. > > I found out that h264 encoding takes up 20 minutes with music and srt > combined for a 2 min random video clip. > That isn't surprising. That is why (and entirely my fault for not making it clearer) I suggested copying the audio stream as well as copying the the video stream (by using -c:v copy) as it already is in an MP4 compatible format. I've never messed around with subtitles, part of the reason I was asking for a sample mp3, mp4, and srt. What is the purpose of the -2 and -strict options? Try removing those and see if you have any better luck. If those don't work and are still unwilling to provide a sample, start with omitting the subtitle portions to make sure that the streams are being copied correctly, and build up from there. Steve > > On Sat, May 31, 2014 at 1:24 PM, Carl Eugen Hoyos <[email protected]> > wrote: > >> Vijay Kanta <viju.kantah@...> writes: >> >> > ffmpeg -i music/qT0pdDhKxFDnfJHq2.mp3 -c:a copy >> > -i video/HKp1ZpHbANT4dmGRC.mp4 -vcodec libx264 >> > -crf 23 -vf subtitles=subtitles/1718379803.srt >> > -preset ultrafast -strict -2 >> > film/HKp1ZpHbANT4dmGRC.mp4 >> >> Move "-c:a copy" behind the last input file. >> >> But please note that compared to H264 encoding, >> audio encoding should always be fast, so the >> speed difference between audio copying and >> audio reencoding should be less than using >> different x264 presets. >> >> Carl Eugen >> >> _______________________________________________ >> Libav-user mailing list >> [email protected] >> http://ffmpeg.org/mailman/listinfo/libav-user >> > > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > >
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