On 21 Mar 2016, at 18:57, jd1008 <jd1...@gmail.com> wrote: > > > On 03/21/2016 09:51 AM, Moritz Barsnick wrote: >> On Sun, Mar 20, 2016 at 11:36:17 -0600, jd1008 wrote: >> >>> highest quality HD 1920x1080 >> You should know better by now to be more specific. E.g. do you have any >> restriction when it comes to codec? Time to convert? File size? >> >> The best quality with the smallest effort can indeed be achieved if you >> let the player/client rescale. I know that some rescalers are bad (I >> own at least one :-P), so you may have a reason. >> >> Rescaling on source level implies reencoding. "Highest quality" can >> strictly only be achieved if you re-encode to a lossless codec (or >> codec variant), at the cost of large files/large bandwidth. does your >> client even understand lossless codecs? Are you okay with large >> bandwidth???? >> >> Even if "lossy" is okay, to achieve similar quality (despite no >> information being added when upscaling), you need more bandwidth than >> the original. You will have to experiment what fits your need. >> >> All those caveats aside: >> $ ffmpeg -i EarthView.mp4 -vf scale=hd1080 -c:v libx264 -c:a copy >> EarthView.large.mp4 >> >> If the quality is not sufficient, add "-crf NN" as output (codec) >> option, and choose a smaller number for NN than the default 23. >> >> I could give better advice if I knew what you were aiming for... >> >> Moritz > Thank you Moritz. > > Using the command you provided. > So far, it has transcoded this much: > frame=45418 fps=6.8 q=28.0 size= 640737kB time=00:31:34.44 > bitrate=2770.7kbits/s > > I tried to play the partialy transcoded file (not sure if that is the right > thing to do), That’s not possible for mp4 files. Only when finished, or you have to use the mpeg2ts container format. > and I got just a lot of changing colored tiny squares and numerous messages > of: > > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=65 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=65 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=94 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=66 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=68 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=81 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=65 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=65 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=67 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=66 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=91 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=65 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=74 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=64 > [dvvideo @ 0x7fdfee20ff20]AC EOB marker is absent pos=101 > > PS: Using ffmpeg-2.6.8-1.fc22.x86_64 > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
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