Transcoding mpeg2video in mpegts to h264 in mpegts has fast playback

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Transcoding mpeg2video in mpegts to h264 in mpegts has fast playback

Pat Double
I’m transcoding a file recorded from an OTA tuner using Plex DVR to h264 to
reduce the size. Due to how Plex DVR tracks existing episodes I want to
shrink the file size using h264 without changing the filename. The
transcoded mpegts file plays faster than the original, appears to be about
2x faster. I can issue the same commands (except for how subtitles are
handled) except using the mkv container and playback is at the expected
speed. I’ve tried various combinations of the fps filter, the -r switch,
thinking it’s the frame rate. I also tried values for the setpts filter and
whatever I tried it made the playback faster (setpts=0.5*PTS,
setpts=2.0*PTS). I have turned on Plex DVR’s support for transcoding to
h264 in a mpegts container and playback is fine. I’ve based my ffmpeg
arguments on that transcoding feature. (I can’t use this feature because my
computer doesn’t have enough compute power.)

I’m using “MPlayer OS X Extended” to play.

Here is my sample:

https://www.dropbox.com/s/7s7itvj1uy2nov7/RobotMaker-short.ts?dl=0

$ ffmpeg -i .\~RobotMaker-short.ts
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.3 (clang-1103.0.32.62)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1 --enable-shared
--enable-pthreads --enable-version3 --enable-avresample --cc=clang
--host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl
--enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame
--enable-libopus --enable-librav1e --enable-librubberband
--enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora
--enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp
--enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid
--enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r
--enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr
--enable-videotoolbox --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mpegts, from '.~RobotMaker-short.ts':
  Duration: 00:02:00.08, start: 1.400000, bitrate: 2343 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv, top first), 704x480 [SAR 40:33 DAR 16:9], Closed Captions,
29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Side data:
      cpb: bitrate max/min/avg: 2917200/0/0 buffer size: 1835008 vbv_delay:
N/A
    Stream #0:1[0x101](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000
Hz, stereo, fltp, 192 kb/s



The mpegts transcode:

$ /usr/local/bin/ffmpeg -hide_banner -benchmark -f lavfi -i
'movie=/Users/double/Movies/.~tmpXXXXXXX.lnk[out+subcc]' -i
/Users/double/Movies/RobotMaker-short.ts -map 1:a -map_chapters 1
-map_metadata 1 -aspect 16:9 -filter_complex
'[1:v]fps=fps=29.969999999999999[0];[0]yadif[1];[1]format=pix_fmts=yuv420p|nv12[2]'
-map '[2]' -crf:v 16 -c:v libx264 -c:a copy -preset fast -t 2:00
/Users/double/Movies/.~RobotMaker-short.transcoded.ts
Input #0, lavfi, from
'movie=/Users/double/Movies/.~tmpXXXXXXX.lnk[out+subcc]':
  Duration: N/A, start: 1.558733, bitrate: N/A
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 704x480 [SAR
1:1 DAR 22:15], 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc
    Stream #0:1: Subtitle: eia_608
Input #1, mpegts, from '/Users/double/Movies/RobotMaker-short.ts':
  Duration: 00:02:00.08, start: 1.400000, bitrate: 2343 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #1:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv, top first), 704x480 [SAR 40:33 DAR 16:9], Closed Captions,
29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Side data:
      cpb: bitrate max/min/avg: 2917200/0/0 buffer size: 1835008 vbv_delay:
N/A
    Stream #1:1[0x101](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000
Hz, stereo, fltp, 192 kb/s
Stream mapping:
  Stream #1:0 (mpeg2video) -> fps
  Stream #1:1 -> #0:0 (copy)
  format -> Stream #0:1 (libx264)
Press [q] to stop, [?] for help
[libx264 @ 0x7fa3a8095e00] using SAR=40/33
[libx264 @ 0x7fa3a8095e00] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7fa3a8095e00] profile High, level 3.0, 4:2:0, 8-bit
Output #0, mpegts, to
'/Users/double/Movies/.~RobotMaker-short.transcoded.ts':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0(eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz,
stereo, fltp, 192 kb/s
    Stream #0:1: Video: h264 (libx264), yuv420p, 704x480 [SAR 40:33 DAR
16:9], q=-1--1, 29.97 fps, 90k tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame= 3592 fps=290 q=-1.0 Lsize=   30112kB time=00:01:59.96
bitrate=2056.2kbits/s speed= 9.7x
video:25655kB audio:2812kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 5.777693%
bench: utime=106.170s stime=3.512s rtime=12.367s
bench: maxrss=159133696kB
[libx264 @ 0x7fa3a8095e00] frame I:50    Avg QP:11.49  size: 30274
[libx264 @ 0x7fa3a8095e00] frame P:997   Avg QP:16.07  size: 13303
[libx264 @ 0x7fa3a8095e00] frame B:2545  Avg QP:18.89  size:  4516
[libx264 @ 0x7fa3a8095e00] consecutive B-frames:  3.2%  4.8%  6.7% 85.3%
[libx264 @ 0x7fa3a8095e00] mb I  I16..4: 25.0% 63.4% 11.7%
[libx264 @ 0x7fa3a8095e00] mb P  I16..4:  4.4% 19.8%  2.0%  P16..4: 24.8%
14.8%  7.0%  0.0%  0.0%    skip:27.2%
[libx264 @ 0x7fa3a8095e00] mb B  I16..4:  1.3%  4.8%  1.4%  B16..8: 24.3%
10.0%  1.2%  direct:11.5%  skip:45.4%  L0:43.1% L1:41.7% BI:15.2%
[libx264 @ 0x7fa3a8095e00] 8x8 transform intra:70.0% inter:60.2%
[libx264 @ 0x7fa3a8095e00] coded y,uvDC,uvAC intra: 67.0% 76.6% 43.3%
inter: 19.6% 27.9% 3.5%
[libx264 @ 0x7fa3a8095e00] i16 v,h,dc,p: 57% 18% 12% 13%
[libx264 @ 0x7fa3a8095e00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 20% 28%  3%
 3%  4%  3%  4%  4%
[libx264 @ 0x7fa3a8095e00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 19% 11%  4%
 6%  7%  6%  6%  5%
[libx264 @ 0x7fa3a8095e00] i8c dc,h,v,p: 43% 21% 29%  7%
[libx264 @ 0x7fa3a8095e00] Weighted P-Frames: Y:10.7% UV:6.3%
[libx264 @ 0x7fa3a8095e00] ref P L0: 67.4% 32.6%
[libx264 @ 0x7fa3a8095e00] ref B L0: 84.8% 15.2%
[libx264 @ 0x7fa3a8095e00] ref B L1: 96.1%  3.9%
[libx264 @ 0x7fa3a8095e00] kb/s:1753.49



The mkv transcode:

$ /usr/local/bin/ffmpeg -hide_banner -benchmark -f lavfi -i
'movie=/Users/double/Movies/.~tmpXXXXXXX.lnk[out+subcc]' -i
/Users/double/Movies/RobotMaker-short.ts -map 0:s -map 1:a -map_chapters 1
-map_metadata 1 -aspect 16:9 -filter_complex
'[1:v]fps=fps=29.969999999999999[0];[0]yadif[1];[1]format=pix_fmts=yuv420p|nv12[2]'
-map '[2]' -crf:v 16 -c:v libx264 -c:a copy -c:s ass -metadata:s:s:0
language=eng -preset fast -t 2:00
/Users/double/Movies/.~RobotMaker-short.transcoded.mkv
Input #0, lavfi, from
'movie=/Users/double/Movies/.~tmpXXXXXXX.lnk[out+subcc]':
  Duration: N/A, start: 1.558733, bitrate: N/A
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 704x480 [SAR
1:1 DAR 22:15], 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc
    Stream #0:1: Subtitle: eia_608
Input #1, mpegts, from '/Users/double/Movies/RobotMaker-short.ts':
  Duration: 00:02:00.08, start: 1.400000, bitrate: 2343 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #1:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv, top first), 704x480 [SAR 40:33 DAR 16:9], Closed Captions,
29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Side data:
      cpb: bitrate max/min/avg: 2917200/0/0 buffer size: 1835008 vbv_delay:
N/A
    Stream #1:1[0x101](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000
Hz, stereo, fltp, 192 kb/s
Stream mapping:
  Stream #1:0 (mpeg2video) -> fps
  Stream #0:1 -> #0:0 (eia_608 (cc_dec) -> ass (native))
  Stream #1:1 -> #0:1 (copy)
  format -> Stream #0:2 (libx264)
Press [q] to stop, [?] for help
[libx264 @ 0x7fc76b81f600] using SAR=40/33
[libx264 @ 0x7fc76b81f600] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7fc76b81f600] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 0x7fc76b81f600] 264 - core 160 r3011 cde9a93 - H.264/MPEG-4 AVC
codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options:
cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 psy=1
psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1
cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=15
lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0
bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25
scenecut=40 intra_refresh=0 rc_lookahead=30 rc=crf mbtree=1 crf=16.0
qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, matroska, to
'/Users/double/Movies/.~RobotMaker-short.transcoded.mkv':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0(eng): Subtitle: ass
    Metadata:
      encoder         : Lavc58.91.100 ass
    Stream #0:1(eng): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo,
fltp, 192 kb/s
    Stream #0:2: Video: h264 (libx264) (H264 / 0x34363248), yuv420p,
704x480 [SAR 40:33 DAR 16:9], q=-1--1, 29.97 fps, 1k tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
[Parsed_movie_0 @ 0x7fc76ae04800] EOF timestamp not
reliablebitrate=1897.7kbits/s speed=9.83x
frame= 3592 fps=292 q=-1.0 Lsize=   28526kB time=00:01:59.96
bitrate=1947.9kbits/s speed=9.76x
video:25653kB audio:2812kB subtitle:3kB other streams:0kB global
headers:1kB muxing overhead: 0.204090%
bench: utime=103.705s stime=3.778s rtime=12.288s
bench: maxrss=167841792kB
[libx264 @ 0x7fc76b81f600] frame I:50    Avg QP:11.49  size: 30230
[libx264 @ 0x7fc76b81f600] frame P:997   Avg QP:16.07  size: 13303
[libx264 @ 0x7fc76b81f600] frame B:2545  Avg QP:18.89  size:  4516
[libx264 @ 0x7fc76b81f600] consecutive B-frames:  3.2%  4.8%  6.7% 85.3%
[libx264 @ 0x7fc76b81f600] mb I  I16..4: 25.0% 63.4% 11.7%
[libx264 @ 0x7fc76b81f600] mb P  I16..4:  4.4% 19.8%  2.0%  P16..4: 24.8%
14.8%  7.0%  0.0%  0.0%    skip:27.2%
[libx264 @ 0x7fc76b81f600] mb B  I16..4:  1.3%  4.8%  1.4%  B16..8: 24.3%
10.0%  1.2%  direct:11.5%  skip:45.4%  L0:43.1% L1:41.7% BI:15.2%
[libx264 @ 0x7fc76b81f600] 8x8 transform intra:70.0% inter:60.2%
[libx264 @ 0x7fc76b81f600] coded y,uvDC,uvAC intra: 67.0% 76.6% 43.3%
inter: 19.6% 27.9% 3.5%
[libx264 @ 0x7fc76b81f600] i16 v,h,dc,p: 57% 18% 12% 13%
[libx264 @ 0x7fc76b81f600] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 20% 28%  3%
 3%  4%  3%  4%  4%
[libx264 @ 0x7fc76b81f600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 19% 11%  4%
 6%  7%  6%  6%  5%
[libx264 @ 0x7fc76b81f600] i8c dc,h,v,p: 43% 21% 29%  7%
[libx264 @ 0x7fc76b81f600] Weighted P-Frames: Y:10.7% UV:6.3%
[libx264 @ 0x7fc76b81f600] ref P L0: 67.4% 32.6%
[libx264 @ 0x7fc76b81f600] ref B L0: 84.8% 15.2%
[libx264 @ 0x7fc76b81f600] ref B L1: 96.1%  3.9%
[libx264 @ 0x7fc76b81f600] kb/s:1753.35


--
Patrick Double
"Ye must be born again." - John 3:7
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Re: Transcoding mpeg2video in mpegts to h264 in mpegts has fast playback

Carl Eugen Hoyos-2


> Am 18.09.2020 um 18:51 schrieb Pat Double <[hidden email]>:
>
> Here is my sample:
>
> https://www.dropbox.com/s/7s7itvj1uy2nov7/RobotMaker-short.ts

Please provide an input sample, never provide output files unless specifically requested.

And please remove -hide_banner from your command line when asking questions here.

Carl Eugen
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Re: Transcoding mpeg2video in mpegts to h264 in mpegts has fast playback

Pat Double
> On Sep 18, 2020, at 1:37 PM, Carl Eugen Hoyos <[hidden email]> wrote:
>
>
>
>> Am 18.09.2020 um 18:51 schrieb Pat Double <[hidden email]>:
>>
>> Here is my sample:
>>
>> https://www.dropbox.com/s/7s7itvj1uy2nov7/RobotMaker-short.ts
>
> Please provide an input sample, never provide output files unless specifically requested.

This is an input sample. If you’ll look at the video stream you’ll see it’s mpeg2video which is what I’ve stated is the input. The output I desire is h264.

> And please remove -hide_banner from your command line when asking questions here.

My first command output includes the banner. I didn’t think it was necessary to include multiple copies of the banner but in the future I will remove -hide_banner from all commands.


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Re: Transcoding mpeg2video in mpegts to h264 in mpegts has fast playback

Carl Eugen Hoyos-2
Am So., 20. Sept. 2020 um 03:13 Uhr schrieb Patrick Double <[hidden email]>:

>
> > On Sep 18, 2020, at 1:37 PM, Carl Eugen Hoyos <[hidden email]> wrote:
> >
> >> Am 18.09.2020 um 18:51 schrieb Pat Double <[hidden email]>:
> >>
> >> Here is my sample:
> >>
> >> https://www.dropbox.com/s/7s7itvj1uy2nov7/RobotMaker-short.ts
> >
> > Please provide an input sample, never provide output files unless specifically requested.
>
> This is an input sample.

The file claims to be written by FFmpeg.

You cannot put ass into mpegts.

Your input file is NOT interlaced, it is telecined, use an inverse
telecine filter. Every deinterlacer permanently damages your video, in
theory an inverse telecine filter creates perfect output.
Both pullup and fieldmatch seem to work ok for your sample.

The following works and keeps the Closed Captions, it may not
work correctly with the inverse telecine filter though:
$ ffmpeg -i input -acodec copy -vcodec lib264 out.ts

Carl Eugen
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Re: Transcoding mpeg2video in mpegts to h264 in mpegts has fast playback

Pat Double

> On Sep 20, 2020, at 4:38 PM, Carl Eugen Hoyos <[hidden email]> wrote:
>
> Am So., 20. Sept. 2020 um 03:13 Uhr schrieb Patrick Double <[hidden email]>:
>>
>>> On Sep 18, 2020, at 1:37 PM, Carl Eugen Hoyos <[hidden email]> wrote:
>>>
>>>> Am 18.09.2020 um 18:51 schrieb Pat Double <[hidden email]>:
>>>>
>>>> Here is my sample:
>>>>
>>>> https://www.dropbox.com/s/7s7itvj1uy2nov7/RobotMaker-short.ts
>>>
>>> Please provide an input sample, never provide output files unless specifically requested.
>>
>> This is an input sample.
>
> The file claims to be written by FFmpeg.

First, thanks for your time and insight.

Plex DVR reads the ATSC stream from the TV tuner via Linux DVB and uses ffmpeg to assemble the mpegts file.

> You cannot put ass into mpegts.

Understood. I’m only using ass when transcoding to mkv. The closed captions so far have been preserved in the h264/mpegts transcode.

> Your input file is NOT interlaced, it is telecined, use an inverse
> telecine filter. Every deinterlacer permanently damages your video, in
> theory an inverse telecine filter creates perfect output.
> Both pullup and fieldmatch seem to work ok for your sample.

That is interesting. Looks like some of the recorded files are interlaced and some are progressive. I’m not sure if this is the broadcast or if Plex is doing it. Which ever it is I don’t have influence on it.

> The following works and keeps the Closed Captions, it may not
> work correctly with the inverse telecine filter though:
> $ ffmpeg -i input -acodec copy -vcodec lib264 out.ts

That command is producing the same results.

However, I tried playing with QuickTime Player (provided with Mac OS X) and the speed is correct. So the fault appears to be with MPlayer OS X Extended. Sorry that I didn’t try multiple players before posting.

Thanks again.
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Re: Transcoding mpeg2video in mpegts to h264 in mpegts has fast playback

Pat Double
In reply to this post by Pat Double

> On Sep 20, 2020, at 11:23 AM, Zak Fallows <[hidden email]> wrote:
>
> Hello Pat,
>
> Please don't take this the wrong way, I am a very curious person and your emails confused me. The first one caught my attention because the subject isn't a question, it is a statement, it says it "has fast playback", so I was wondering "is this a question, or is this person sharing a tip or trick?"

Sorry for the confusion, it’s a statement of something I don’t like :) Namely, the transcode plays faster than it should. I should’ve been more clear.

> With that disclaimer out of the way...
>
> Is your name really Pat B. Double, or is the surname "Double" to imply that this is a second identity?

This is my real name. I’ve had the spelling and pronunciation questioned, but never the legitimacy. No worries ;)

>
> Is the BibleThumper app for PalmOS a joke? I looked at the PDF manual, it looks like a joke. But it claims to be from 2010 and I never had a Palm Pilot. I feel like it might be a joke because your name is Pat B. Double and the files were .PBD files, which could be "PalmOS Binary Data" or something, but that's also just your initials if Pat B. Double is your name.

It’s no joke. It was popular at the time but with the release of the iPhone I would have had to re-write it to keep it going and I didn’t have the time. .PBD is the required extension for PalmOS Binary Database.

> I have never seen any portion of "The Six Million Dollar Man", it looks interesting. How old are you? I'm 33, it may have been before my time, but maybe I could watch it with my father to appease him.

I’m 44. If you don’t mind cheesy effects I think it’s a pretty good show for the genre.

>
> You also talked about a Plex DVR - is that software, like Plex itself, or a hardware device? I'm looking for a project to do with my father, and we don't have Plex, and the network-accessible-storage drive has tons of permissions problems and "discoverability" problems. I hear good things about Plex.
>

Plex DVR is a software solution. It’s part of the Plex install, not a separate item. You need a compatible TV tuner in your computer.

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