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MP4 processing pipeline is missing movflags faststart #773

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MP4 processing pipeline is missing movflags faststart#773
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bugSomething isn't working

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@liamwhite
liamwhite
opened on Oct 6, 2026

-movflags +faststart

This gives a less than ideal video playback experience for "top contender for 'worst web browser currently in existence' competition" (ios safari)

here:

philomena/lib/philomena_media/processors/webm.ex

Lines 143 to 161 in 953f6ce

"-c:v",
"libx264",
"-pix_fmt",
"yuv420p",
"-profile:v",
"main",
"-preset",
"medium",
"-crf",
"18",
"-b:v",
"5M",
"-vf",
filter,
"-threads",
"4",
"-max_muxing_queue_size",
"4096",
mp4

and here:

philomena/lib/philomena_media/processors/webm.ex

Lines 180 to 198 in 953f6ce

"-c:v",
"libx264",
"-pix_fmt",
"yuv420p",
"-profile:v",
"main",
"-preset",
"medium",
"-crf",
"18",
"-b:v",
"5M",
"-vf",
filter,
"-threads",
"4",
"-max_muxing_queue_size",
"4096",
mp4

and here:

philomena/lib/philomena_media/processors/gif.ex

Lines 139 to 151 in 953f6ce

"-c:v",
"libx264",
"-preset",
"medium",
"-pix_fmt",
"yuv420p",
"-profile:v",
"main",
"-crf",
"18",
"-b:v",
"5M",
mp4

(also this is a lot of duplication, this should probably be cleaned up regardless because we're going to start supporting mp4 uploads next year)

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  1. liamwhite
    added
    bugSomething isn't working
    on Oct 6, 2026
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