Hi Marc,
Thanks for your answer.
/So I made some further tests and discovered that my original AVI
file is />/simply corrupted. It's supposed to have 88 minutes of
video, but it fails />/after 38 minutes. /
What does "fails" mean? The player stops? Which player? The video goes
black
but playing continues? Please be specific.
ffmpeg (a very recent version - or any version) will stop copying the
stream after 00:38:50.12 (instead of 01:28:00.80):
ffmpeg -i test.avi -c copy test.copy.avi
ffmpeg version N-63101-gc92edd969a-static
https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2022 the FFmpeg
developers
built with gcc 8 (Debian 8.3.0-6)
configuration: --enable-gpl --enable-version3 --enable-static
--disable-debug --disable-ffplay --disable-indev=sndio
--disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-gmp --enable-libgme --enable-gray
--enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf
--enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband
--enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis
--enable-libopus --enable-libtheora --enable-libvidstab
--enable-libvo-amrwbenc --enable-libvpx --enable-libwebp
--enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d
--enable-libxvid --enable-libzvbi --enable-libzimg
libavutil 57. 36.101 / 57. 36.101
libavcodec 59. 42.104 / 59. 42.104
libavformat 59. 30.101 / 59. 30.101
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 48.100 / 8. 48.100
libswscale 6. 8.108 / 6. 8.108
libswresample 4. 9.100 / 4. 9.100
libpostproc 56. 7.100 / 56. 7.100
[avi @ 0x653e900] non-interleaved AVI
Input #0, avi, from 'test.avi':
Duration: 01:28:00.80, start: 0.000000, bitrate: 221185 kb/s
Stream #0:0: Video: v210 (v210 / 0x30313276), yuv422p10le, 720x576,
25 fps, 25 tbr, 25 tbn
Output #0, avi, to 'test.copy.avi':
Metadata:
ISFT : Lavf59.30.101
Stream #0:0: Video: v210 (v210 / 0x30313276), yuv422p10le, 720x576,
q=2-31, 25 fps, 25 tbr, 25 tbn
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame=58254 fps=128 q=-1.0 Lsize=62915254kB time=00:38:50.12
bitrate=221191.1kbits/s speed=5.12x
video:62914320kB audio:0kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.001485%
The exit code is zero:
echo $?
0
test.avi is still the 146-GB file I mentioned originally.
You may want to try multiple players to see what's in the file and
look at
it with ffprobe and mediainfo. Also try encoding into a different format
which will force ffmpeg to demux/decode the frames; that might turn up
something.
Here are a few things I've tried:
- I've checked other AVI files in our archive coming from the same
company. They "behave" as expected, i.e. they indeed contain about 1.5
GB per minute of video stream (SD video) and can be copied or transcoded
from beginning to end. No problem there. I've only found one single
problematic file.
- Play the problematic file with VLC. It stops the playback after 38
minutes as well and doesn't even display the full duration of the file
(01:28:00).
- Examine it with mediainfo (full log here
https://drive.google.com/drive/folders/1h2GxriHtvx86jxcpN41GKmJBURGO3y6P?usp=sharing).
mediainfo says the duration is 01:28:00.800, but the "source duration"
is 00:00:38.840 (not 38 minutes, but 38 seconds, which is weird!).
- Transcode the AVI to MKV/H.264 (full command line available, but
pretty standard). The resulting MKV file has a duration of 38 minutes
only and can be played without any problem. Actually, I think I can do
pretty much anything with the problematic AVI file using ffmpeg. It will
just see it as a normal 38-minute file.
- Examine the file with ffprobe (ffprobe -hide_banner -select_streams
v:0 -show_frames). The full output log is available at the same location
as the mediainfo output. I get information for 58254 frames, so about 38
minutes of video.
Thanks,
Olivier
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