ffmpeg changes interlaced to progressive

[SF01]

Hello.

I was recentely dumping miniDV tapes with two audio tracks, Scenalyzer outputs stereo AVI and second audio track as WAV, so I thought of using ffmpeg to merge them:

ffmpeg -i input_video_with_audio.avi -i new_audio.wav -map 0 -map 1 -codec copy output_video.avi

And the

-codec copy

somehow changes the interlaced video type to progressive, as inspected in mediainfo.
Below the info from the original file:

Video
ID                                       : 0
Format                                   : DV
Commercial name                          : DVCPRO
Codec ID                                 : dvsd
Codec ID/Hint                            : Sony
Duration                                 : 7 min 10 s
Bit rate mode                            : Constant
Bit rate                                 : 24.4 Mb/s
Encoded bit rate                         : 28.8 Mb/s
Width                                    : 720 pixels
Height                                   : 576 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Constant
Frame rate                               : 25.000 FPS
Standard                                 : PAL
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Interlaced
Scan order                               : Bottom Field First
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 2.357
Time code of first frame                 : 00:00:00:01
Time code source                         : Subcode time code
Stream size                              : 1.44 GiB (96%)
Encoding settings                        : wb mode= / white balance= / fcm=auto focus

And here is the output:

Video
ID                                       : 0
Format                                   : DV
Commercial name                          : DVCPRO
Codec ID                                 : dvsd
Codec ID/Hint                            : Sony
Duration                                 : 7 min 10 s
Bit rate mode                            : Constant
Bit rate                                 : 24.4 Mb/s
Encoded bit rate                         : 28.8 Mb/s
Width                                    : 720 pixels
Height                                   : 576 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Constant
Frame rate                               : 25.000 FPS
Standard                                 : PAL
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Original scan type                       : Interlaced
Original scan order                      : Bottom Field First
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 2.357
Time code of first frame                 : 00:00:00:01
Time code source                         : Subcode time code
Stream size                              : 1.44 GiB (93%)
Encoding settings                        : wb mode= / white balance= / fcm=auto focus

Why is the scan type changed?
And how to get ffmpeg to simply add the second audio stream without changing any parameter of the video and audio streams?

[Selur]

haven't done this in a while, but iirc you need to add:

-top 0

for bff signaling
see: https://www.ffmpeg.org/ffmpeg-all.html#Advanced-Video-option

[SF01]

haven't done this in a while, but iirc you need to add:

-top 0

for bff signaling
see: https://www.ffmpeg.org/ffmpeg-all.html#Advanced-Video-option

thank you, but that didn't change anything.

While i'm at it maybe i should change sample aspect ratio fro default and incorrect 16:15 to proper 128/117, ut i'd need to go through all the other tapes as well...

From what i can see it affects the input video:
https://www.ffmpeg.org/ffmpeg-all.html#toc-Options-1

I think I'm one step closer, the option

field_order field_order (video)

might be the solution, but for bottom field first there is a switch where bff is encoded first and tff is encoded first, i would assume it's the bottom showed and encoded first, right?

[Selur]

you can try if:

-flags +ildct+ilme

helps.

Cu Selur

Ps.: if you share a short sample of the source I can reproduce and try to check the flags myself.

[SF01]

you can try if:

-flags +ildct+ilme

helps.

Cu Selur

Ps.: if you share a short sample of the source I can reproduce and try to check the flags myself.

I already tried it, it does not have the effect.

But the one I mentioned above seems to work, I am however not certain if it's correct, DV has bottom field displayed first, but I cannot find any niformation of the bottom or top is coded first.

[ProWo]

https://superuser.com/questions/1344442/ffmpeg-how-to-create-an-interlaced-h-264-video

[SF01]

https://superuser.com/questions/1344442/ffmpeg-how-to-create-an-interlaced-h-264-video

Been there, tried that, results as in first post.

What I tried and worked i have describes later, but i don't know which switch to use for that, as there are 4.

[jagabo]

I think I'm one step closer, the option

field_order field_order (video)

might be the solution, but for bottom field first there is a switch where bff is encoded first and tff is encoded first, i would assume it's the bottom showed and encoded first, right?

'bb' appears to be correct.

[ProWo]

What's about -vf 'interlace=scan=tff:lowpass=complex' -flags +ildct?

[SF01]

What's about -vf 'interlace=scan=tff:lowpass=complex' -flags +ildct?

Filtergraph ''interlace=scan=tff:lowpass=complex'' was defined for video output stream 0:0 but codec copy was selected.
Filtering and streamcopy cannot be used together.

Not an option. like I said, it must be the one I mentioned before, but the question is it's either bottom shown first and encoded first, or bottom whoed first, but top encoded first. And I cannot find any information which one is encoded first in DV specification.

[ProWo]

I found the solution. It's the avi muxer from FFmpeg that sets the progressive flag. You have to use the mkv muxer instead like this:
ffmpeg -i input_video_with_audio.avi -i new_audio.wav -map 0 -map 1 -codec copy output_video.mkv
Then use mkvcleaver to extract the avi file.

[jagabo]

I compared the output of a DV AVI created by VirtualDub, AviDemux, and ffmpeg. MediaInfo reports

Scan type                                : Interlaced
Scan order                               : Bottom Field First

for the VirtualDub, AviDemux, and ffmpeg with -field_order bb videos. But with -field_order tb it reports:

Scan type                                : Interlaced
Scan order                               : Top Field First
Original scan order                      : Bottom Field First

All the files played properly in the media players I tried. Even ffmpeg created videos with -field_order tt and bt (which are definitely wrong). The players were all set up to display 30i video at 59.94 fps.

I looked a little more closely at what ffmpeg does that's different than the other programs: Ffmpeg adds an ODML 2.0 vprp chunk with the field order flags. The other editors don't. This is the first time I've seen an AVI file with a vprp chunk. I don't think many programs create or pay any attention to vprp chunks.

By the way, to get ffmpeg to include all audio streams when it remuxes use -map 0. If your second audio stream is from a second source file use -map file:stream to indicate which streams you want to include. Something like -map 0:0 -map 0:1 -map 1:1 (include streams 0 and 1 of the first input file, stream 1 of the second input file).

https://github.com/stoyanovgeorge/ffmpeg/wiki/How-to-Map-Streams-in-FFMPEG

[SF01]

I compared the output of a DV AVI created by VirtualDub, AviDemux, and ffmpeg. MediaInfo reports

Scan type                                : Interlaced
Scan order                               : Bottom Field First

for the VirtualDub, AviDemux, and ffmpeg with -field_order bb videos. But with -field_order tb it reports:

Scan type                                : Interlaced
Scan order                               : Top Field First
Original scan order                      : Bottom Field First

All the files played properly in the media players I tried. Even ffmpeg created videos with -field_order tt and bt (which are definitely wrong). The players were all set up to display 30i video at 59.94 fps.

I looked a little more closely at what ffmpeg does that's different than the other programs: Ffmpeg adds an ODML 2.0 vprp chunk with the field order flags. The other editors don't. This is the first time I've seen an AVI file with a vprp chunk. I don't think many programs create or pay any attention to vprp chunks.

By the way, to get ffmpeg to include all audio streams when it remuxes use -map 0. If your second audio stream is from a second source file use -map filetream to indicate which streams you want to include. Something like -map 0:0 -map 0:1 -map 1:1 (include streams 0 and 1 of the first input file, stream 1 of the second input file).

https://github.com/stoyanovgeorge/ffmpeg/wiki/How-to-Map-Streams-in-FFMPEG

This answers my question, so the bb switch is correct, and the tb in tis case is incorrect.

In my case -map 0 -map 1 will suffice, The first file is DV+audio, the othwe is second stereo track in separate WAV, so no need to specify streams inside files, as i want to mx everything together.

Thank you for the information, so the whole comman will look like this:

ffmpeg -i input_video_with_audio.avi -i new_audio.wav -map 0 -map 1 -codec copy -field_order bb output_video.avi

I've just oticed that in media info in the general info there is a new line:

Format profile                           : OpenDML

What is it and why it suddenly appears is beyond me. Any switch to disable it?