@Zixue
Please post the video link here, so i can take a look.
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>> Frame resize -> retain source DAR, works well.
How about the idea of applying it to "crop detection" too?
> This is not a good idea.
Think for example of a 2.39:1 movie that was letterboxed and encoded as 16:9.
Right! 1920x800 will be cut to 1424x800. 25% content cut away. I would'nt do that.
But I've got some DVDs with very old 4:3 movies (512x384 - 550X412) where the borders are unclean and flickering because they are professionally filmed from the screen.
Between 4 and 20 pixel need to be cut all around.
With retain source DAR, I do not need to calculate the cuts any longer to keep the aspect ratio as the app takes care.
But that's not important.
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NEW: When a mp4 has no subtitle and I add a srt, the default and forced flag does not work with VLC for mp4 but for mkv file extension!
mp4 details from MediaInfo:
Text
ID : 3
Format : Timed Text
Muxing mode : sbtl
Codec ID : tx3g
Duration : 34 min 34 s
Bit rate mode : Variable
Bit rate : 4 b/s
Frame rate : 0.036 FPS
Stream size : 962 Bytes (0%)
Title : Forced
Default : Yes
Forced : Yes / No
Alternate group : 3
Count of events : 37 -
>> NEW: When a mp4 has no subtitle and I add a srt, the default and forced flag does not work with VLC for mp4 but for mkv file extension!
> Tested, i confirm the problem, but this must be a ffmpeg bug, because the disposition is correctly written.
Thanks for the hint. Your right!
But GPAC-2.5-DEV-rev854-g83429541-master support forced subtitles for mp4 and works also very quick.
Interesting!
When I load this working GPAC mp4 in your app, forced is not set. I can set it or not, after multiplexing it remains working forced.
GPAC mp4 details from MediaInfo:
Text
ID : 3
Format : Timed Text
Codec ID : tx3g
Duration : 34 min 34 s
Bit rate mode : Variable
Bit rate : 4 b/s
Frame rate : 0.036 FPS
Stream size : 962 Bytes (0%)
Title : srt#trackID=1:lang=eng:txtflags+=0xC0000000#name=@ GPAC2.5-DEV-rev854-g83429541-master
Language : English
Forced : Yes
Encoded date : 2025-02-10 23:07:59 UTC
Tagged date : 2025-02-10 23:07:59 UTC
Count of events : 37
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