Re: [FFmpeg-user] Add subtitles to trimmed mp4

[adam smith via ffmpeg-user]

I have tested multiple source formats, I was totally wrong and Leo was bang on 
the money.
This is working great. I am able to concat multiple trimmed files together and 
the subtitles remain timed to the output - all is good and I am super happy.

Thanks Leo.
Adam

> On 13 Feb 2021, at 11:12, adam smith  wrote:
> 
> Actually I think I may have just been a bit of a donut and you may be spot on.
> Now I have had a cup of tea and woken up properly, I will do some more 
> testing on different source formats and get back to you.
> 
> Thank you for your help, as always to everyone in the group it is very much 
> appreciated.

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Re: [FFmpeg-user] Add subtitles to trimmed mp4

[adam smith via ffmpeg-user]

> On 13 Feb 2021, at 10:46, adam smith via ffmpeg-user  
> wrote:
> 
> Thanks Leo. 
> I gave it a try but the same thing happened regarding the subtitle position 
> and the in point of the media appeared less accurate and had black at the 
> start.
> I believe this is because -ss prior to the file path does a quick seek to the 
> closest key frame to the desired timing, whereas -ss after the file path 
> decodes all the data to find the actual specified timing.

Actually I think I may have just been a bit of a donut and you may be spot on.
Now I have had a cup of tea and woken up properly, I will do some more testing 
on different source formats and get back to you.

Thank you for your help, as always to everyone in the group it is very much 
appreciated.

Adam

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Re: [FFmpeg-user] Add subtitles to trimmed mp4

[adam smith via ffmpeg-user]

> On 13 Feb 2021, at 02:10, Leo Butler via ffmpeg-user  
> wrote:
> 
> I think you want to do
> 
> ffmpeg -y -ss 10 -t 30 -i input.mp4 -ss 10 -t 30 -i input.srt ...
> 
> See
> 
> https://ffmpeg.org/ffmpeg-all.html#toc-Main-options 
> 
> 
> Leo

Thanks Leo. 
I gave it a try but the same thing happened regarding the subtitle position and 
the in point of the media appeared less accurate and had black at the start.
I believe this is because -ss prior to the file path does a quick seek to the 
closest key frame to the desired timing, whereas -ss after the file path 
decodes all the data to find the actual specified timing.


> 
>> -filter_complex "[0:1]fifo[vout];[0:0]afifo[01_afifo]" -map "[vout]"
>> -map "[01_afifo]" -map 1 -pix_fmt yuv420p -c:v libx264 -s 1920x1080
>> -profile:v high -level:v 4.1 -refs:v 2 -keyint_min 50 -b:v 15000k -r
>> 25 -ac 2 -bsf:a aac_adtstoasc -c:a libfdk_aac -ar 48000 -b:a 192k
>> -c:s:0 mov_text -metadata:s:s:0 language=eng -flags +global_header -f
>> tee
>> "[f=mp4:movflags=+faststart]/data/disposable/transcode_20210212-1147-znbqck/edit_2805.mp4"
> 
> Do you mean to you `tee' with only one output sink?

My command is put together by a script I created and its configured to be able 
to write to multiple outputs, so tee is needed, in this test though I am only 
supplying a single output path and I didn’t write the script well enough to 
adapt the command. It doesn’t appear to do any harm, although you are right its 
a bit shit.


If you have any other ideas, keep them coming :)

Thanks
Adam

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Re: [FFmpeg-user] Add subtitles to trimmed mp4

[Leo Butler via ffmpeg-user]

adam smith via ffmpeg-user  writes:

> Hi people, I have a subtitle question; yay. 
>
> I have a 2 minute mp4 that I am going to trim using -ss and -to . 
>
> I have a SRT subtitle file with timings that will line up with the trimmed 
> mp4. 
>
> If I try and trim the mp4 and add the subtitles at the same time, the trim is 
> ignored and the whole media file is encoded. 
>
> ffmpeg -y -i
> /data/disposable/localised_20210212-1147-u81zpu/full_mp4.mp4 -ss 10
> -to 40 -i https://somewhere/source/subtitles/subtitles.srt

I think you want to do

ffmpeg -y -ss 10 -t 30 -i input.mp4 -ss 10 -t 30 -i input.srt ...

See

https://ffmpeg.org/ffmpeg-all.html#toc-Main-options

Leo

> -filter_complex "[0:1]fifo[vout];[0:0]afifo[01_afifo]" -map "[vout]"
> -map "[01_afifo]" -map 1 -pix_fmt yuv420p -c:v libx264 -s 1920x1080
> -profile:v high -level:v 4.1 -refs:v 2 -keyint_min 50 -b:v 15000k -r
> 25 -ac 2 -bsf:a aac_adtstoasc -c:a libfdk_aac -ar 48000 -b:a 192k
> -c:s:0 mov_text -metadata:s:s:0 language=eng -flags +global_header -f
> tee
> "[f=mp4:movflags=+faststart]/data/disposable/transcode_20210212-1147-znbqck/edit_2805.mp4"

Do you mean to you `tee' with only one output sink?

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[FFmpeg-user] Add subtitles to trimmed mp4

[adam smith via ffmpeg-user]

Hi people, I have a subtitle question; yay. 

I have a 2 minute mp4 that I am going to trim using -ss and -to . 

I have a SRT subtitle file with timings that will line up with the trimmed mp4. 

If I try and trim the mp4 and add the subtitles at the same time, the trim is 
ignored and the whole media file is encoded. 

ffmpeg -y -i /data/disposable/localised_20210212-1147-u81zpu/full_mp4.mp4 -ss 
10 -to 40 -i https://somewhere/source/subtitles/subtitles.srt -filter_complex 
"[0:1]fifo[vout];[0:0]afifo[01_afifo]" -map "[vout]" -map "[01_afifo]" -map 1 
-pix_fmt yuv420p -c:v libx264 -s 1920x1080 -profile:v high -level:v 4.1  
-refs:v 2 -keyint_min 50 -b:v 15000k -r 25 -ac 2 -bsf:a aac_adtstoasc -c:a 
libfdk_aac -ar 48000 -b:a 192k -c:s:0 mov_text -metadata:s:s:0 language=eng 
-flags +global_header -f tee 
"[f=mp4:movflags=+faststart]/data/disposable/transcode_20210212-1147-znbqck/edit_2805.mp4"


If I add the -ss and -to command to the subtitle input file too, the output 
file has been trimmed, but the subtitles are out of sync. The subtitles stay 
locked to the time of the source media. 

ffmpeg -y -i /data/disposable/localised_20210212-1147-u81zpu/full_mp4.mp4 -ss 
10 -to 40 -i https://somewhere/source/subtitles/subtitles.srt -ss 10 -to 40 
-filter_complex "[0:1]fifo[vout];[0:0]afifo[01_afifo]" -map "[vout]" -map 
"[01_afifo]" -map 1 -pix_fmt yuv420p -c:v libx264 -s 1920x1080 -profile:v high 
-level:v 4.1  -refs:v 2 -keyint_min 50 -b:v 15000k -r 25 -ac 2 -bsf:a 
aac_adtstoasc -c:a libfdk_aac -ar 48000 -b:a 192k -c:s:0 mov_text 
-metadata:s:s:0 language=eng -flags +global_header -f tee 
"[f=mp4:movflags=+faststart]/data/disposable/transcode_20210212-1147-znbqck/edit_2805.mp4"


Is there any way to force the subtitles in the SRT to be mapped to the time of 
the output?
I would prefer not to do it in two passes if possible. 

I can include console output if it helps but I am pretty sure I am just putting 
the command together incorrectly and nothing untoward is happening. 

Thanks in advance for your advice. 

Adam

Sent from my iPhone
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