FFmpeg does not copy subtitles with two input files

[ignace72]

Hello everyone.
FFmpeg does not copy subtitles with two input files.
To convert my videos to Av1and Opus, I first use the following command to convert the video track to Av1 :

ffmpeg -i video.5.1.subfr.mkv -map 0:v:0 -pix_fmt yuv420p10le -f yuv4mpegpipe -strict -1 - | SvtAv1EncApp -i stdin --preset 6 --keyint 240 --input-depth 10 --crf 30 --rc 0 --passes 1 --film-grain 0 -b av1.ivf

Then I use the following command to add the Av1 video track, convert the audio track from the start file to Opus and copy the subtitle track from the start file:

ffmpeg -i av1.ivf -i video.5.1.subfr.mkv -map 0:v -map 1:a:0 -c:v copy -c:a libopus -af channelmap=channel_layout=5.1 -b:a 250k -vbr on -c:s copy video.5.1.av1.opus.mkv

Once done, I look at the video.5.1.av1.opus.subfr.mkv file with MKVToolNix Gui, there is no subtitle track.

After thinking about it, I wonder if I shouldn't map the subtitle track with :
-map 1:s
Or :
-map 1:s:0
positioned after :
-map 0:v -map 1:a:0

I looked at the documentation of FFmpeg on the official website but it is not clear to me at all.

I'm already converting a video track to Av1, which takes several hours so I'm asking before I'm done. If I don't get an answer by then, I'll do some tests and report the results here.

If anyone has any ideas?
Thanks
Ignace.

[october262]

Hello everyone.
FFmpeg does not copy subtitles with two input files.
To convert my videos to Av1and Opus, I first use the following command to convert the video track to Av1 :

ffmpeg -i video.5.1.subfr.mkv -map 0:v:0 -pix_fmt yuv420p10le -f yuv4mpegpipe -strict -1 - | SvtAv1EncApp -i stdin --preset 6 --keyint 240 --input-depth 10 --crf 30 --rc 0 --passes 1 --film-grain 0 -b av1.ivf

Then I use the following command to add the Av1 video track, convert the audio track from the start file to Opus and copy the subtitle track from the start file:

ffmpeg -i av1.ivf -i video.5.1.subfr.mkv -map 0:v -map 1:a:0 -c:v copy -c:a libopus -af channelmap=channel_layout=5.1 -b:a 250k -vbr on -c:s copy video.5.1.av1.opus.mkv

Once done, I look at the video.5.1.av1.opus.subfr.mkv file with MKVToolNix Gui, there is no subtitle track.

After thinking about it, I wonder if I shouldn't map the subtitle track with :
-map 1
Or :
-map 1:0
positioned after :
-map 0:v -map 1:a:0

I looked at the documentation of FFmpeg on the official website but it is not clear to me at all.

I'm already converting a video track to Av1, which takes several hours so I'm asking before I'm done. If I don't get an answer by then, I'll do some tests and report the results here.

If anyone has any ideas?
Thanks
Ignace.

try this here - https://superuser.com/questions/1273764/using-ffmpeg-on-how-do-i-copy-the-video-and-mu...eams-in-an-mkv

[ignace72]

Hello, October262.
Thank you for your quick and precise answer.
According to the link I gave myself, adapted to my case, I had to add :

-map 1:s?

-map 1 to indicate to use the second input file :s to indicate to take care of the subtitles and ? to take all the available subtitles.
This will allow me to be sure that the subtitles are well copied.
Positioned after :

-map 0:v -map 1:a:0

I don't know if I've got it right, I'll test it once my current conversion is finished, I'll come back afterwards to say if it's good or not.
Thanks again.
Ignace.

[ignace72]

Hello.
Sorry, but since last night the conversion process has been stuck at 26 minutes without returning to the command prompt and therefore without an error message.
I didn't realize it until 30 minutes ago.
So I just restarted the process.
So I'll get back to you to report on the modified command test as mentioned above after the process is complete.
Thank you.
Ignace.

[ignace72]

That's it, the conversion of the video track to Av1 is finished.
Adding -map 1:s? to my command works perfectly.
Problem solved.
Thanks, october262.
Ignace.

[Anonymous543]

Try -c:s copy command

-c:s = command for selecting codec of subtitle
copy = copies subtitle stream without rencode

[ignace72]

Hello, kirito.
You didn't read my first and last messages.
The piece of order you suggest is already present in my order and I indicated the piece of order that was missing, and I indicated that my problem is solved.
Ignace.