[FFmpeg-trac] #4768(undetermined:new): FFmpeg preserving CFR during TS to MP4 conversion

[FFmpeg]

#4768: FFmpeg preserving CFR during TS to MP4 conversion
-------------------------------------+-------------------------------------
             Reporter:  zer0z        |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  dts          |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by zer0z):

 Thanks to cehoyos and Zenitram for the workaround! cehoyos (or anyone) is
 it best to put -r with both the input and the output? I am trying to avoid
 dropped/duplicated frames. I did a test (below) and specifying -r for both
 input and output was slightly faster than specifying -r for just the
 input. The resultant byte size was identical with either method.


 '''time ffmpeg -i test.ts -r 24000/1001 -c copy -r 24000/1001 test.mp4'''
 {{{
 Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 720x404,
 q=2-31, 23.98 fps, 24k tbn, 23.98 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 [mp4 @ 0x9abcc00] pts has no value
     Last message repeated 100 times
 pts has no value0.0 q=-1.0 size=   47628kB time=00:05:19.48
 bitrate=1221.2kbits/s
 [mp4 @ 0x9abcc00] pts has no value
     Last message repeated 126 times
 pts has no value15602 q=-1.0 size=  106538kB time=00:10:51.73
 bitrate=1339.1kbits/s
 [mp4 @ 0x9abcc00] pts has no value
     Last message repeated 135 times
 pts has no value18071 q=-1.0 size=  165451kB time=00:18:52.29
 bitrate=1197.0kbits/s
 [mp4 @ 0x9abcc00] pts has no value
     Last message repeated 54 times
 frame=32069 fps=17822 q=-1.0 Lsize=  198750kB time=00:22:17.46
 bitrate=1217.4kbits/s
 video:198374kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 0.189591%
 }}}
 '''real    0m1.891s'''
 [[br]]
 [[br]]
 [[br]]
 [[br]]
 '''time ffmpeg -i test.ts -r 24000/1001 -c copy test.mp4'''
 {{{
 Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 720x404,
 q=2-31, 23.98 fps, 24k tbn, 23.98 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 [mp4 @ 0x9486c00] pts has no value
     Last message repeated 71 times
 pts has no value0.0 q=-1.0 size=   37083kB time=00:04:01.82
 bitrate=1256.2kbits/s
 [mp4 @ 0x9486c00] pts has no value
     Last message repeated 90 times
 pts has no value11599 q=-1.0 size=   72934kB time=00:08:04.10
 bitrate=1234.2kbits/s
 [mp4 @ 0x9486c00] pts has no value
     Last message repeated 80 times
 pts has no value11669 q=-1.0 size=  115578kB time=00:12:10.68
 bitrate=1295.8kbits/s
 [mp4 @ 0x9486c00] pts has no value
     Last message repeated 118 times
 pts has no value13592 q=-1.0 size=  165954kB time=00:18:54.96
 bitrate=1197.8kbits/s
 [mp4 @ 0x9486c00] pts has no value
     Last message repeated 54 times
 frame=32069 fps=13699 q=-1.0 Lsize=  198750kB time=00:22:17.46
 bitrate=1217.4kbits/s
 video:198374kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 0.189591%
 }}}
 '''real    0m2.463s'''

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Ticket URL: <https://trac.ffmpeg.org/ticket/4768#comment:14>
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