How can I force ffmpeg to use a 360kHz time base? (I spent 1/2 day searching.)
Thanks! Mark. With a 1kHz time base: 65535 = largest 16-bit integer. 0:01:05.535 = longest running time for 16-bit integer with 1kHz time base.. Conclusion: FFmpeg cannot be using 16-bit integers. 16777215 = largest 24-bit integer. 4:39:37.215 = longest running time for 24-bit integer with 1kHz time base. Conclusion: FFmpeg could use 24-bit integers if time base is capped at 1kHz. With a 90kHz time base: 16777215 = largest 24-bit integer. 00:03:06.4135 = longest running time for 24-bit integer with 90kHz time base. Conclusion: FFmpeg cannot be using 24-bit integers. 4294967295 = largest 32-bit integer. 13:15:21.8588[3..] = longest running time for 32-bit integer with 90kHz time base. 24/1.001fps ==> deltaPTS = 3753.75. 24fps ==> deltaPTS = 3750. 25fps ==> deltaPTS = 3600. 30/1.001fps ==> deltaPTS = 3003. 30fps ==> deltaPTS = 3000. 50fps ==> deltaPTS = 1875. 60/1.001fps ==> deltaPTS = 1501.5. 60fps ==> deltaPTS = 1500. Conclusion: Since 24/1.001fps requires rounding, a 90kHz time base is not optimal. With a 360kHz time base: 4294967295 = largest 32-bit integer. 3:18:50.464708[3..] = longest running time for 32-bit integer with 360kHz time base. 24/1.001fps ==> deltaPTS = 15015. 24fps ==> deltaPTS = 15000. 25fps ==> deltaPTS = 14400. 30/1.001fps ==> deltaPTS = 12012. 30fps ==> deltaPTS = 12000. 50fps ==> deltaPTS = 7200. 60/1.001fps ==> deltaPTS = 6006. 60fps ==> deltaPTS = 6000. 100fps ==> deltaPTS = 3600. 120/1.001fps ==> deltaPTS = 3003. 120fps ==> deltaPTS = 3000. Conclusion: A 360kHz time base is optimal, even for 100fps & 120fps. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
