On Fri, Jun 20, 2014 at 02:12:41AM +0100, Ken Moffat wrote: > > After two days of intermittent banging my head against a keyboard / > googling / cursing, I have now got a process of preparing the > individual clips with ffmpeg to a position where it might be usable. [...] > > What I have done for now is to keep the audio as .wav, and called > it a .mkv file because it clearly isn't mp4. Xine only plays the > video from this. The benefit of this is that the although even the > video has now grown by 67ms, the audio has only grown by 69ms so the > relative loss of sync is 2ms for this clip. > > Still need to do similar things to at least one other clip (but > I think I now understand the process, and on a good day I can > remember how the ffmpeg options fit together), and prepare at least a > title image, then I will find out if I can successfully convert it > all to mp4 and upload it to youtube : for the moment, I am sort-of > expecting that to fail, in which case I will be in mega-sulk mode in > a few days :-( >
And now getting very close to mega-sulk mode, and I have not even got as far as trying to upload to youtube. Last night I tried concatenating a caption (png converted to video) and two clips, then just the two clips. In each case, the audio was fine but only the first item had correct video. After that, video was mostly solid colours, sometimes with some visual noise. After that I searched some more and found the "-x264-params -stitchable" option mentioned. Of course, that means re-encoding all the video. So, last night I did a quick test with the first two clips, using -preset ultrafast for a single pass encoding. That worked, although the video quality on one clip was noticeably worse than with the -preset veryslow two-pass encoding. So, today I started over and re-encoded the first three clips, plus captions for before and after, using -two-pass veryslow. Finally got to where I can try to stitch them together (using -f concat and a text file listing the things to use), and again the video is trashed after the first item. I retried without the initial caption, just in case there was something else wrong there, but then the first clip plays ok and the second is trashed. I can almost remember how I felt the last time I eventually gave up trying to edit my clips (that was apparently with ffmpeg-0.7.4). I hesitate to say "suggestions welcome" because some suggestions will undoubtedly upset me, but has anyone here edited .mov video clips into a single video using _recent_ ffmpeg ? Meanwhile, I think I'll just go back to trying to build -rc kernels, at the moment it looks as if 3.16 is going to be as painful for my hardware as 3.15 was. ĸen -- Nanny Ogg usually went to bed early. After all, she was an old lady. Sometimes she went to bed as early as 6 a.m. -- http://lists.linuxfromscratch.org/listinfo/blfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
