Re: [Mlt-devel] Adjust playback speed/rate of entire playlist or tractor
Yes, that's correct. Well, to be more accurate, the current set of consumers does not support audio where the speed is not 1. It sounds like for what you want, some non-trivial analysis and changes are required. On Wed, Jul 18, 2018 at 3:55 PM Steve Rubin wrote: > Thanks. I tried that function before, and from what I understand (from > other threads in this mailing list), it doesn't support audio. Is that > correct? > > On Wed, Jul 18, 2018 at 3:47 PM, Dan Dennedy wrote: > >> Use mlt_producer_set_speed() on the tractor (or playlist as seen in >> melted): >> >> https://www.mltframework.org/doxygen/structmlt__producer__s.html#a15cb033f194e160cc9f62ce0b3080ff9 >> >> Despite the speed being a double, decimals digits are truncated, and >> speed less than one for slower than realtime are not supported in a default >> build. There is a unsupported build option that makes the mlt_position type >> use double instead of int32_t (define DOUBLE_MLT_POSITION), but there is >> definitely going to be breakage if you use that. Basically, this value is >> added to a frame number-based counter of type mlt_position in the producer. >> Negative values are supported to play in reverse. If you look in >> src/melt/melt.c you can see this function being used. >> >> >> >> On Wed, Jul 18, 2018 at 3:39 PM Steve Rubin wrote: >> >>> I understand that the timewarp producer manipulates a producer's >>> playback rate. Is there a way to adjust the playback rate of a higher order >>> producer, e.g., a playlist or tractor? >>> >>> This would enable a straightforward implementation of a project-level >>> playback speed option in a DAW/NLE (rather than having to do fine-grained >>> management of playback rates on each producer). >>> >>> Thanks, >>> Steve >>> >>> -- >>> Check out the vibrant tech community on one of the world's most >>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>> ___ >>> Mlt-devel mailing list >>> Mlt-devel@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/mlt-devel >>> >> > -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot___ Mlt-devel mailing list Mlt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mlt-devel
Re: [Mlt-devel] Adjust playback speed/rate of entire playlist or tractor
Thanks. I tried that function before, and from what I understand (from other threads in this mailing list), it doesn't support audio. Is that correct? On Wed, Jul 18, 2018 at 3:47 PM, Dan Dennedy wrote: > Use mlt_producer_set_speed() on the tractor (or playlist as seen in > melted): > https://www.mltframework.org/doxygen/structmlt__producer__s.html# > a15cb033f194e160cc9f62ce0b3080ff9 > > Despite the speed being a double, decimals digits are truncated, and speed > less than one for slower than realtime are not supported in a default > build. There is a unsupported build option that makes the mlt_position type > use double instead of int32_t (define DOUBLE_MLT_POSITION), but there is > definitely going to be breakage if you use that. Basically, this value is > added to a frame number-based counter of type mlt_position in the producer. > Negative values are supported to play in reverse. If you look in > src/melt/melt.c you can see this function being used. > > > > On Wed, Jul 18, 2018 at 3:39 PM Steve Rubin wrote: > >> I understand that the timewarp producer manipulates a producer's playback >> rate. Is there a way to adjust the playback rate of a higher order >> producer, e.g., a playlist or tractor? >> >> This would enable a straightforward implementation of a project-level >> playback speed option in a DAW/NLE (rather than having to do fine-grained >> management of playback rates on each producer). >> >> Thanks, >> Steve >> >> -- >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot__ >> _ >> Mlt-devel mailing list >> Mlt-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/mlt-devel >> > -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot___ Mlt-devel mailing list Mlt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mlt-devel
Re: [Mlt-devel] Adjust playback speed/rate of entire playlist or tractor
Use mlt_producer_set_speed() on the tractor (or playlist as seen in melted): https://www.mltframework.org/doxygen/structmlt__producer__s.html#a15cb033f194e160cc9f62ce0b3080ff9 Despite the speed being a double, decimals digits are truncated, and speed less than one for slower than realtime are not supported in a default build. There is a unsupported build option that makes the mlt_position type use double instead of int32_t (define DOUBLE_MLT_POSITION), but there is definitely going to be breakage if you use that. Basically, this value is added to a frame number-based counter of type mlt_position in the producer. Negative values are supported to play in reverse. If you look in src/melt/melt.c you can see this function being used. On Wed, Jul 18, 2018 at 3:39 PM Steve Rubin wrote: > I understand that the timewarp producer manipulates a producer's playback > rate. Is there a way to adjust the playback rate of a higher order > producer, e.g., a playlist or tractor? > > This would enable a straightforward implementation of a project-level > playback speed option in a DAW/NLE (rather than having to do fine-grained > management of playback rates on each producer). > > Thanks, > Steve > > -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > ___ > Mlt-devel mailing list > Mlt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mlt-devel > -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot___ Mlt-devel mailing list Mlt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mlt-devel
[Mlt-devel] Adjust playback speed/rate of entire playlist or tractor
I understand that the timewarp producer manipulates a producer's playback rate. Is there a way to adjust the playback rate of a higher order producer, e.g., a playlist or tractor? This would enable a straightforward implementation of a project-level playback speed option in a DAW/NLE (rather than having to do fine-grained management of playback rates on each producer). Thanks, Steve -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot___ Mlt-devel mailing list Mlt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mlt-devel
