FLV video has no sound, when played with mplayer, VLC refuses to play it at all


I have downloaded this video http://www.youtube.com/watch?v=CpznCSeqMxw as a flv file. When I now try to play it, mplayer says

Audio: no sound

and shows the video, but no sound (which is, why I have downloaded the video—to have the sound).

And VLC refuses to play it at all. No error message. I am confused.

The file type in Linux:

$ file Space\ Night\ -\ Earth\ Views\ 4-5.flv 
Space Night - Earth Views 4-5.flv: ISO Media

And some more information from mplayer:

$ mplayer -frames 0 -identify Space\ Night\ -\ Earth\ Views\ 4-5.flv 2> /dev/null | grep -i 'audio\|sound\|video\|clip'
[lavf] stream 0: video (h264), -vid 0
VIDEO:  [H264]  600x480  24bpp  25.000 fps  338.6 kbps (41.3 kbyte/s)
Clip info:
ID_CLIP_INFO_VALUE3=2013-07-03 06:36:36
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
Audio: no sound

Now, what is the reason for this? If I watch it on Youtube it has sound. I don’t think the sound is stripped off during download.

And why isn’t VLC playing the file at all (no video, no sound, it only shows the length of the file, but when I press the play button it stops the playback immediately).

Is somebody able to reproduce this? Or is it just me?

PS: This is the first time this happens. I have already downloaded a lot of videos with DownloadHelper.

Best Answer

Well I've tested the .mp4 (the [Medium] option on the dropdown of DownloadHelper, the .flv is taking forever though) in VLC and it went flawlessly, audio and video.

DownloadHelper does suffer some problems from then to then, so I'll check the changelog for more info on potential bugs. But the low rate of transfer of the .flv file is what signals me as the problem.

A bug report BUG 554 was opened recently and it seems it was fixed (although nothing in the bug report states completion) in version 4.9.18. I'm using the latest version.

Finally got around downloading the .flv and I don't have those problems, I can hear the sound as well as on the .mp4. My conclusion is that the addon (as described earlier) or the Internet connection botched your file.

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