Muxing interlaced video

[kingcrimsonster]

1.I am muxing the source file into the transport stream. As a muxer, I chose ffmpeg, since the ts-muxer introduces A-V resync. The output is a small inappropriate source file.
2. I am muxing the source file in to MKV.
In the tab "Muxing" - "Adjsut to stream frame rate" check or uncheck this box - no difference.
Source file options:

Format : MPEG Video
Frame rate : 25.000 FPS
Standard : PAL

Output File Options:

Frame rate mode : Variable
Frame rate : 50.000 FPS
Original frame rate : 25.000 FPS

If I mux the source file using mkvtoolnix - Output file options:

Frame rate mode : Constant
Frame rate : 25.000 FPS
Standard : PAL

Source file

[Selur]

Source file options:
Format : MPEG Video
Frame rate : 25.000 FPS
Standard : PAL

Output File Options:
Frame rate mode : Variable
Frame rate : 50.000 FPS
Original frame rate : 25.000 FPS

Where do these values come from?

When looking at the source file I get:

Video Count : 378 Count of stream of this kind : 1 Kind of stream : Video Kind of stream : Video Stream identifier : 0 StreamOrder : 0 FirstPacketOrder : 0 ID : 224 ID : 224 (0xE0) Format : MPEG Video Format : MPEG Video Commercial name : MPEG-2 Video Format version : Version 2 Format profile : Main@Main Format settings : CustomMatrix / BVOP Format settings, BVOP : Yes Format settings, BVOP : Yes Format settings, Matrix : Custom Format settings, Matrix : Custom Format_Settings_Matrix_Data : 10111112121213131313141414141415151515151516161616161616171717171717171718181818181818191A191A1A191B1B1B1A1B1C1C1C1C1E1E1E1F1F21 Format settings, GOP : M=3, N=15 Format settings, picture structure : Frame Internet media type : video/MPV Duration : 178600 Duration : 2 min 58 s Duration : 2 min 58 s 600 ms Duration : 2 min 58 s Duration : 00:02:58.600 Duration : 00:02:58:15 Duration : 00:02:58.600 (00:02:58:15) Bit rate mode : VBR Bit rate mode : Variable Bit rate : 9000000 Bit rate : 9 000 kb/s Width : 720 Width : 720 pixels Height : 576 Height : 576 pixels Sampled_Width : 720 Sampled_Height : 576 Pixel aspect ratio : 1.067 Display aspect ratio : 1.333 Display aspect ratio : 4:3 Frame rate : 25.000 Frame rate : 25.000 FPS Frame count : 4465 Standard : PAL Color space : YUV Chroma subsampling : 4:2:0 Chroma subsampling : 4:2:0 Bit depth : 8 Bit depth : 8 bits Scan type : Interlaced Scan type : Interlaced Scan order : BFF Scan order : Bottom Field First Compression mode : Lossy Compression mode : Lossy Bits/(Pixel*Frame) : 0.868 Delay : 247.811111 Delay : 248 ms Delay : 248 ms Delay : 248 ms Delay : 00:00:00.248 Delay_DropFrame : No Delay, origin : Container Delay, origin : Container Delay_Original : 0 Delay_Original : 00:00:00.000 Delay_Original_Settings : drop_frame_flag=0 / closed_gop=1 / broken_link=0 Delay_Original_DropFrame : No Delay_Original_Source : Stream Time code of first frame : 00:00:00:00 Time code source : Group of pictures header GOP, Open/Closed : Open GOP, Open/Closed : Open GOP, Open/Closed of first frame : Closed GOP, Open/Closed of first frame : Closed Stream size : 201127997 Stream size : 192 MiB (96%) Stream size : 192 MiB Stream size : 192 MiB Stream size : 192 MiB Stream size : 191.8 MiB Stream size : 192 MiB (96%) Proportion of this stream : 0.95628 Buffer size : 229376 intra_dc_precision : 9

for the video no indication of VFR.

Cu Selur

[kingcrimsonster]

Source file options:
Format : MPEG Video
Frame rate : 25.000 FPS
Standard : PAL

Output File Options:
Frame rate mode : Variable
Frame rate : 50.000 FPS
Original frame rate : 25.000 FPS

Where do these values come from?

for the video no indication of VFR.

Cu Selur

the sorce file has a constant frame rate. It's right.
When I mux this file in the *.mkv with Mkvtoolnix output file has a constant frame rate. It's right.
When I mux this file in the *.mkv with Hybrid output file indicated as vfr. It's wrong!

[Selur]

Ah, I see problem is probably with the mkvmerge muxing call.
-> I'll look into it.

Cu Selur

[kingcrimsonster]

Selur, please fix besides this problem, the problem of mux in the transport stream with FFmpeg.

[Selur]

Problem with the ffmpeg muxing

ffmpeg -y -r 25 -i "E:\Output\21_56_32_1910_02.m2v" -i "E:\Output\iId_1_aid_0_21_56_32_1910_01.wav" -vcodec copy -acodec copy -map 0:0 -map 1:0 -metadata encoding_tool="Hybrid 2019.09.21.1" -aspect 133375:100000 -r 25 -fflags +genpts -f mpegts -muxrate 100000000 "E:\Output\Adriana Russo - Capriccio ( Discoring 81).ts"

is that ffmpeg aborts with:

[mpegts @ 0000021f25038200] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
[mpegts @ 0000021f25038200] first pts value must be set
av_interleaved_write_frame(): Invalid data found when processing input

No real clue why this happens and how to fix it.
The extracted audio&video stream seem to be okay.

Adding '-fflags +genpts' does seem to fix something since the muxing doesn't crash, but the output audio isn't muxed properly now. :/

Cu Selur

[kingcrimsonster]

Selur, please fix the A-V resync when muxing to the transport stream using TS-muxer.
This source file without resync. When I mux it with Hybrid (using TS-muxer) in the output *.ts file beginning with 01:10 it has a A-V resync.

[Selur]

About muxing pcm audio with ffmpeg into a transport stream is not supported by ffmpeg.
(tsMuxeR converts the audio to LPCM which ffmpeg doesn't support afaik.)

Looking into the second file and tsMuxer remuxing.

[Selur]

I suspect that the stream is stretched, but the mkv stretch detection is broken atm. looking into it.
This will take a while,...
(may be tomorrow in case I find the time)

Cu Selur

[kingcrimsonster]

About muxing pcm audio with ffmpeg into a transport stream is not supported by ffmpeg.
(tsMuxeR converts the audio to LPCM which ffmpeg doesn't support afaik.)

Looking into the second file and tsMuxer remuxing.

Quote from here

Though PCM is a more general term, it is often used to describe data encoded as LPCM.

ts-muxer is not able to convert or change any parameter of audio or video.
Selur, try opening "Il Silenzio (Melissa Venema) [Live in Maastricht II] (N).mkv" in TS-muxer.
You will see in the "tracks" window in the column "codec" "LPCM" in the properties of the audio track