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fix: video thumbnail generation for short videos (#20629)

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fix video thumbnail generation for short videos

ffmpeg gives conversion failed with error 234 for short mp4 files (less
than 10s) that where converted from m2ts. Longer videos work fine.

It looks like ffmpeg has no frames left to use for generating a
thumbnail.

This change fixes this issue and seems to not change the behaviour for
other mp4 files (same thumbnail before and after change)

This might also fix all mts file thumbnail generation.
This commit is contained in:
patrickgoering 2025-08-06 15:10:49 +02:00 committed by GitHub
parent 6ddef3a7e4
commit 1ca46fbd98
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GPG Key ID: B5690EEEBB952194
2 changed files with 4 additions and 4 deletions
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6
server/src/services/media.service.spec.ts
View File

@ -368,7 +368,7 @@ describe(MediaService.name, () => {
'-frames:v 1',
'-update 1',
'-v verbose',
String.raw`-vf fps=12:eof_action=pass:round=down,thumbnail=12,select=gt(scene\,0.1)-eq(prev_selected_n\,n)+isnan(prev_selected_n)+gt(n\,20),trim=end_frame=2,reverse,scale=-2:1440:flags=lanczos+accurate_rnd+full_chroma_int:out_range=pc`,
String.raw`-vf fps=12:start_time=0:eof_action=pass:round=down,thumbnail=12,select=gt(scene\,0.1)-eq(prev_selected_n\,n)+isnan(prev_selected_n)+gt(n\,20),trim=end_frame=2,reverse,scale=-2:1440:flags=lanczos+accurate_rnd+full_chroma_int:out_range=pc`,
],
twoPass: false,
}),
@ -403,7 +403,7 @@ describe(MediaService.name, () => {
'-frames:v 1',
'-update 1',
'-v verbose',
String.raw`-vf fps=12:eof_action=pass:round=down,thumbnail=12,select=gt(scene\,0.1)-eq(prev_selected_n\,n)+isnan(prev_selected_n)+gt(n\,20),trim=end_frame=2,reverse,tonemapx=tonemap=hable:desat=0:p=bt709:t=bt709:m=bt709:r=pc:peak=100:format=yuv420p`,
String.raw`-vf fps=12:start_time=0:eof_action=pass:round=down,thumbnail=12,select=gt(scene\,0.1)-eq(prev_selected_n\,n)+isnan(prev_selected_n)+gt(n\,20),trim=end_frame=2,reverse,tonemapx=tonemap=hable:desat=0:p=bt709:t=bt709:m=bt709:r=pc:peak=100:format=yuv420p`,
],
twoPass: false,
}),
@ -440,7 +440,7 @@ describe(MediaService.name, () => {
'-frames:v 1',
'-update 1',
'-v verbose',
String.raw`-vf fps=12:eof_action=pass:round=down,thumbnail=12,select=gt(scene\,0.1)-eq(prev_selected_n\,n)+isnan(prev_selected_n)+gt(n\,20),trim=end_frame=2,reverse,tonemapx=tonemap=hable:desat=0:p=bt709:t=bt709:m=bt709:r=pc:peak=100:format=yuv420p`,
String.raw`-vf fps=12:start_time=0:eof_action=pass:round=down,thumbnail=12,select=gt(scene\,0.1)-eq(prev_selected_n\,n)+isnan(prev_selected_n)+gt(n\,20),trim=end_frame=2,reverse,tonemapx=tonemap=hable:desat=0:p=bt709:t=bt709:m=bt709:r=pc:peak=100:format=yuv420p`,
],
twoPass: false,
}),

2
server/src/utils/media.ts
View File

@ -403,7 +403,7 @@ export class ThumbnailConfig extends BaseConfig {
getFilterOptions(videoStream: VideoStreamInfo): string[] {
return [
'fps=12:eof_action=pass:round=down',
'fps=12:start_time=0:eof_action=pass:round=down',
'thumbnail=12',
String.raw`select=gt(scene\,0.1)-eq(prev_selected_n\,n)+isnan(prev_selected_n)+gt(n\,20)`,
'trim=end_frame=2',