<p>I consider subtitle text rendering is part of the player feature. If you are using VLC, may this link, <a href="https://wiki.videolan.org/VLC_HowTo/Adjust_subtitle_font_settings/" rel="nofollow noreferrer">https://wiki.videolan.org/VLC_HowTo/Adjust_subtitle_font_settings/</a>, help?</p>
<p>I had tried on a mkv to mp4 video, before
<a href="https://i.sstatic.net/oDwZ1.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/oDwZ1.jpg" alt="enter image description here" /></a></p>
<p>After, I changed the VLC subtitle font size to larger, exited the program and replayed it again, i got
<a href="https://i.sstatic.net/sdbfP.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/sdbfP.jpg" alt="enter image description here" /></a></p>

CC BY-SA 4.0
2020-10-18T13:42:40.827Z
I already tried to change font size, appearance from vlc preferences, as I mentioned in the post. But it did not have any affect on the subtitiles.
Utkarsh Singh
CC BY-SA 4.0
2020-10-19T08:03:45.420Z
i updated my answer with screen-capture
xer-rex
CC BY-SA 4.0
2020-10-20T07:29:27.017Z
Every other text becomes large except the subtitles.[ScreenShot](https://i.imgur.com/37DfEx0.png)  , Also you can notice that the subtitles are not hardcoded. Still their size is unaffected by changes in vlc preferences.
Utkarsh Singh
CC BY-SA 4.0
2020-10-18T10:26:07.837Z
2020-10-19T08:03:17.147Z
2020-10-19T08:03:17.147Z
xer-rex
<p>I was having a similar issue and realised it was because the subtitles contained style information that VLC was only rendering in the output file, not the input file. Have you checked if the SSA subtitle file contains some style specifications like font size? To copy the contents of the SSA without the style information you can use</p>
<pre><code>ffmpeg -i input.mkv -map 0:s -c:s text output.srt
</code></pre>
<p>and then mux those into the mp4.</p>

CC BY-SA 4.0
2024-05-04T23:43:47.830Z
2024-05-04T23:43:47.830Z
mxrmo
<p>I want to <em>remux</em> a mkv file into mp4.
I used the following command.</p>
<pre><code>ffmpeg -i &quot;input.mkv&quot; -c:v copy -c:a copy -map 0:0 -map 0:1 -map 0:2 -map 0:3 -c:s mov_text &quot;output.mp4&quot;
</code></pre>
<h3>Problem: The subtitles in the <code>output.mp4</code> file are way too small.</h3>
<p>Also, the subtitles of the mp4 file are unaffected when I try to make them bigger from vlc preferences.
I can turn them on/off but I think they are somewhat hardcoded.
I had to rencode subtitles while remuxing as otherwise it was showing error.
Also, I'm using the latest version of mmpeg.</p>
<h3><code>input.mkv</code> : <p></p></h3>
<img src="https://i.sstatic.net/gwTFX.png" width="400" />
<h3><code>output.mp4</code> :</h3>
<img src="https://i.sstatic.net/DStiF.png" width="400" />
<h3></h3>
<p><code>input.mkv</code> has the following streams,codecs : <p></p>
<img src="https://i.sstatic.net/Hmw7b.png" width="400" /></p>
<p><strong>I searched a lot, but couldn't find a way to make <code>mov_text</code> subtitles bigger. How can I make them bigger?</strong></p>
<p>Or Please suggest any other way to retain the subtitles while remuxing from mkv to mp4.</p>

<video><ffmpeg><mp4><subtitles><mkv>
ffmpeg mov_text subtitle too small when converting mkv to mp4
Utkarsh Singh
# ffmpeg mov_text subtitle too small when converting mkv to mp4

(Asked by: username_0 on 2020-10-18)

I want to remux a mkv file into mp4.
I used the following command.
ffmpeg -i "input.mkv" -c:v copy -c:a copy -map 0:0 -map 0:1 -map 0:2 -map 0:3 -c:s mov_text "output.mp4"

Problem: The subtitles in the output.mp4 file are way too small.
Also, the subtitles of the mp4 file are unaffected when I try to make them bigger from vlc preferences.
I can turn them on/off but I think they are somewhat hardcoded.
I had to rencode subtitles while remuxing as otherwise it was showing error.
Also, I'm using the latest version of mmpeg.
input.mkv : 

output.mp4 :


input.mkv has the following streams,codecs : 

I searched a lot, but couldn't find a way to make mov_text subtitles bigger. How can I make them bigger?
Or Please suggest any other way to retain the subtitles while remuxing from mkv to mp4.

**Tags:** video, ffmpeg, mp4, subtitles, mkv


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## 2 answers

### Answer by username_1 on 2020-10-18. Score: 0

I consider subtitle text rendering is part of the player feature. If you are using VLC, may this link, <https://wiki.videolan.org/VLC_HowTo/Adjust_subtitle_font_settings/>, help?

I had tried on a mkv to mp4 video, before
[![enter image description here](https://i.sstatic.net/oDwZ1.jpg)](https://i.sstatic.net/oDwZ1.jpg)

After, I changed the VLC subtitle font size to larger, exited the program and replayed it again, i got
[![enter image description here](https://i.sstatic.net/sdbfP.jpg)](https://i.sstatic.net/sdbfP.jpg)

> **Comments:**
> **username_0**: I already tried to change font size, appearance from vlc preferences, as I mentioned in the post. But it did not have any affect on the subtitiles.  
> **username_1**: i updated my answer with screen-capture  
> **username_0**: Every other text becomes large except the subtitles.[ScreenShot](https://i.imgur.com/37DfEx0.png)  , Also you can notice that the subtitles are not hardcoded. Still their size is unaffected by changes in vlc preferences.  

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### Answer by username_2 on 2024-05-04. Score: 0

I was having a similar issue and realised it was because the subtitles contained style information that VLC was only rendering in the output file, not the input file. Have you checked if the SSA subtitle file contains some style specifications like font size? To copy the contents of the SSA without the style information you can use
ffmpeg -i input.mkv -map 0:s -c:s text output.srt

and then mux those into the mp4.


---

