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JuliusCode / MP4MUSEUM

MP4MUSEUM.org Media Player
GNU General Public License v3.0
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Seamless loop starts not at start #20

Closed minizzZ closed 1 year ago

minizzZ commented 1 year ago

Hello,

For an exhibition I've been working with 10 Raspberry Pi Zero W's and your MP4Museum. The video is, you see a face, it morphs into another one and than morphs back. The thing is some (not all) of the loops don't start at the beginning, it looks like it jumps 10 seconds at the start of the loop. The specs video's are:

Length 1:20 Frame Widt x height: 1920x1080 Data rate: 1265kbps Total Bitrate: 1908kbps Frame Rate 25.00 frames/second

They've been handbraked into h264 mp4 and have been put on the internal card of the pi. I use the original img, hasn't been tweaked or hacked. Also I made the video three times longer. Result was still a jump in time at the start and the rest was good.

I can send you a link of the video but via a pm because I'm not the owner of the material, but it is ok to send it.

Do you have any idea?

JuliusCode commented 1 year ago

Hi, is the bitrate you mentioned an average over the file or constant/max? it could be too low.

it‘s hard to say without seeing the content, but when trying out presets in habdbrake, include a profile from the „production“ section, starting with the lowest quality.

a different approach would be to re-edit your loop into a longer file, by repetition of your content. this way the stuttering would appear only every hour, or so.

you can also email me if you like, the adress is on the website.

best, Julius.

minizzZ commented 1 year ago

I will send you a WeTransfer with the files via email

JuliusCode commented 1 year ago

hey, i was able to take a look at your file today.

it loops well on my test hardware (v5 on raspbery pi 1), if renamed to "loop.mp4". maybe switch sd cards?

regarding the encoding, there were unused audio tracks in the file and i did re-encode for testing with the "vimeo/youtube hq 1080p" setting and even with no audio tracks, the file came out twice the size. but it resulted in no change regarding playback on the raspi, both was fine.

best, Julius.