The VideoLAN Forums

Hello,
I updated an mp4 file information using CTRL + I (Media information) "Genre" field with "1", so I could easily find it from a bunch of files.
The mp4 file does not play anymore. On reversing what I did before, the file still does not play.
Is the file doomed?
Thanks!

Update1: Used easytag to remove extra data when Media information was edited... file still does not play.

Using ffmpeg, I tried re-encode? the file... and I get this output:

[aac @ 0x14d1dc0] channel element 0.0 is not allocated
[h264 @ 0x14d0600] AVC: nal size 0
[h264 @ 0x14d0600] no frame!
[h264 @ 0x14d0600] AVC: nal size 1283325678
[h264 @ 0x14d0600] no frame!
[h264 @ 0x14d0600] AVC: nal size 561647459
...
... [redacted to save space]
...
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x14cf400] decoding for stream 0 failed
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x14cf400] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none(tv, bt709), 1280x720, 11871 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'VID_main.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
title : VID_main.mp4
creation_time : 2016-02-11 14:52:52
Duration: 00:10:12.01, start: 0.000000, bitrate: 12548 kb/s
Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), none(tv, bt709), 1280x720, 11871 kb/s, SAR 1:1 DAR 16:9, 26.87 fps, 30 tbr, 90k tbn, 180k tbc (default)
Metadata:
creation_time : 2016-02-11 14:52:52
handler_name : VideoHandle
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 127 kb/s (default)
Metadata:
creation_time : 2016-02-11 14:52:52
handler_name : SoundHandle
[buffer @ 0x14cf280] Unable to parse option value "-1" as pixel format
Last message repeated 1 times
[buffer @ 0x14cf280] Error setting option pix_fmt to value -1.
[graph 0 input from stream 0:0 @ 0x14d4f80] Error applying options to the filter.
Error opening filters!

That is all of it. What happened to my file and how do I fix it?

Please upload a short sample of a problematic file to either Zippyshare.com (200 MB max) or to EmbedUpload.com, the latter will upload the file for you to several other hosts (use the default ones) and then post the link to the file here.

If needed cut it with DGsplit and read here about how to do it:
viewtopic.php?f=14&t=57724&p=193335#p193335
50 MB max should be enough.


Anyway, to be safe you should never work on an original file but always on a copy.

Hello Lotesdelere!

I created a [dummy] video (21 secs; ~31MB).
Then I re-created the problem with a copy. While playing the mp4 file, I pressed CTRL + I, click in the "Genre" Field and type "1", then clicked "Save Metadata." Now, the file does not play.
The file is uploaded here: http://www52.zippyshare.com/v/d1OIlvw2/file.html

Thank you for looking into this.

Solution is to use untrunc ; steps posted here: https://superuser.com/questions/417100/ ... video-file