[GH-ISSUE #1193] Problems with downloading videos from YouTube #12078

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GiteaMirror · 2026-05-08T08:22:04-05:00

GiteaMirror commented

2026-05-08 08:22:04 -05:00

Originally created by @omerika867 on GitHub (Mar 25, 2025).
Original GitHub issue: https://github.com/imputnet/cobalt/issues/1193

bug description

Downloaded videos from YouTube are not rewound, for example, in MX Player
But they are not added to kinemaster, because it says that the video is too short. And in the gallery he writes that the video lasts 0 seconds

reproduction steps

1 download video YouTube

screenshots

No response

links

platform information

Chrome 134.0.6998.109 Android 10; POCOPHONE F1 Build/QKQ1.190828.002

additional context

No response

Originally created by @omerika867 on GitHub (Mar 25, 2025). Original GitHub issue: https://github.com/imputnet/cobalt/issues/1193 ### bug description Downloaded videos from YouTube are not rewound, for example, in MX Player But they are not added to kinemaster, because it says that the video is too short. And in the gallery he writes that the video lasts 0 seconds ### reproduction steps 1 download video YouTube ### screenshots _No response_ ### links ```shell ``` ### platform information Chrome 134.0.6998.109 Android 10; POCOPHONE F1 Build/QKQ1.190828.002 ### additional context _No response_

GiteaMirror added the main instance issue label 2026-05-08 08:22:04 -05:00

GiteaMirror closed this issue

2026-05-08 08:22:06 -05:00

GiteaMirror commented

2026-05-08 08:22:08 -05:00

@jericjan commented on GitHub (Mar 29, 2025):

noticed this has been happening for a good while. Messenger on mobile, for example, also treats it as an empty video. Vegas Pro shows the audio track but the video track is just a couple frames, however any regular video player plays it fine. A remux does fix it, but damn, that takes ages compared to just remuxing with ffmpeg

@jericjan commented on GitHub (Mar 29, 2025): noticed this has been happening for a good while. Messenger on mobile, for example, also treats it as an empty video. Vegas Pro shows the audio track but the video track is just a couple frames, however any regular video player plays it fine. A remux does fix it, but damn, that takes ages compared to just remuxing with ffmpeg

GiteaMirror commented

2026-05-08 08:22:10 -05:00

@wukko commented on GitHub (Mar 29, 2025):

that takes ages compared to just remuxing with ffmpeg

cobalt's remuxing is almost instant on desktop, or are you talking about running it on an android phone in chrome?

@wukko commented on GitHub (Mar 29, 2025): > that takes ages compared to just remuxing with ffmpeg cobalt's remuxing is almost instant on desktop, or are you talking about running it on an android phone in chrome?

GiteaMirror commented

2026-05-08 08:22:11 -05:00

@jericjan commented on GitHub (Mar 29, 2025):

Yeah, it's pretty slow on mobile. On PC, maybe my CPU was too old. To be fair, I didn't even give it a chance to finish. It took so long that I exited it when it took longer than ffmpeg and still didn't reach the part where it shows the remux progress (or maybe that doesn't display on PC)

@jericjan commented on GitHub (Mar 29, 2025): Yeah, it's pretty slow on mobile. On PC, maybe my CPU was too old. To be fair, I didn't even give it a chance to finish. It took so long that I exited it when it took longer than ffmpeg and still didn't reach the part where it shows the remux progress (or maybe that doesn't display on PC)

GiteaMirror commented

2026-05-08 08:22:13 -05:00

@WanHaes commented on GitHub (Mar 30, 2025):

There are issues in downloads with VP9 and AV1 codecs. MediaInfo shows "conformance errors"

Conformance errors                       : 2
 0x8538067                               : Yes
  General compliance                     : Element size 72057594037927935 is more than maximal permitted size 1461845012 (offset 0x30)
 Matroska                                : Yes
  General compliance                     : File size 1461845060 is less than expected size at least 72057594037927983 (offset0x30)

Rewind causes stutters and some parts of video cannot be viewed.

H.264 downloads don't have such issues.

@WanHaes commented on GitHub (Mar 30, 2025): There are issues in downloads with VP9 and AV1 codecs. MediaInfo shows "conformance errors" ``` Conformance errors : 2 0x8538067 : Yes General compliance : Element size 72057594037927935 is more than maximal permitted size 1461845012 (offset 0x30) Matroska : Yes General compliance : File size 1461845060 is less than expected size at least 72057594037927983 (offset0x30) ``` Rewind causes stutters and some parts of video cannot be viewed. H.264 downloads don't have such issues.

GiteaMirror commented

2026-05-08 08:22:14 -05:00

@jericjan commented on GitHub (Mar 30, 2025):

For me, H.264 is still problematic. I already had it set to H.264 when I noticed all these problems

@jericjan commented on GitHub (Mar 30, 2025): For me, H.264 is still problematic. I already had it set to H.264 when I noticed all these problems

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Reference: github-starred/cobalt#12078