Re: [FFmpeg-user] Overlay one subtitle stream and copy another
Hans Carlson inbox.com> writes: > In fact, it appears the fifo for the subtitle stream isn't > needed, because this works as well: > >'[0:v]fifo[vid];[vid][0:3]overlay` Yes, I thought so. > My test file is only 22 secs long... is there a chance I'd > need the fifo on the subtitle stream if I'm processing > something longer? Sorry, I don't know;-( (But it should be trivial to test.) > I'm not really sure what the fifo filter is doing or why > it's needed, I suspect it is related to the fact that not all parts of the pipeline operate with the same speed (or that some parts are too greedy), in any case, fifo is buffering frames so they don't get lost. Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Overlay one subtitle stream and copy another
On Mon, 7 Mar 2016, Carl Eugen Hoyos wrote: I suspect the stream specifiers [0:v] and [0:3] ensure that fifo is not used. I am not sure what the correct usage is but you could try '[0:v}fifo[v];[0:3]fifo[o];[v][o]overlay` (untested) Thanks, that seems to work. No more buffer overflow warnings and it plays fine without any video pauses. In fact, it appears the fifo for the subtitle stream isn't needed, because this works as well: '[0:v]fifo[vid];[vid][0:3]overlay` My test file is only 22 secs long... is there a chance I'd need the fifo on the subtitle stream if I'm processing something longer? I'm not really sure what the fifo filter is doing or why it's needed, since it only seems to be needed if I'm trying to overlay a subtitle stream AND copy a subtitle stream. But, in this case, the subtitle stream I'm copying has nothing to do with the subtitle stream which is overlayed on the video. Any additional enlightenment would be appreciated. If you have no further info, then thanks for the suggestion since it appears to fix the problem. FYI. The 2nd example in my original post -- copying and overlaying the SAME subtitle stream -- also seems to work with this approach: '[0:v]fifo[vid];[vid][0:2]overlay' ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Overlay one subtitle stream and copy another
Hans Carlson inbox.com> writes: > I changed my original command to use this filter_complex: > >-filter_complex 'fifo; [0:v][0:3]overlay' I suspect the stream specifiers [0:v] and [0:3] ensure that fifo is not used. I am not sure what the correct usage is but you could try '[0:v}fifo[v];[0:3]fifo[o];[v][o]overlay` (untested) Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Overlay one subtitle stream and copy another
On Mon, 7 Mar 2016, Carl Eugen Hoyos wrote: Hans Carlson inbox.com> writes: Buffer queue overflow, dropping. You can use the fifo filter to avoid these, it will increase memory usage. Probably I'm doing something wrong, but adding the fifo filter didn't help. I'm not exactly sure how/where I should be using it. I changed my original command to use this filter_complex: -filter_complex 'fifo; [0:v][0:3]overlay' I still see the buffer overflow warnings. But the problem isn't just that I see these warnings, the problem is the resulting video doesn't play correctly. At a couple points, the video stalls and the audio continues for several seconds, then the video skips ahead. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Overlay one subtitle stream and copy another
Hans Carlson inbox.com> writes: > Buffer queue overflow, dropping. You can use the fifo filter to avoid these, it will increase memory usage. Carl Eugen ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
