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Médias (91)
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DJ Z-trip - Victory Lap : The Obama Mix Pt. 2
15 septembre 2011
Mis à jour : Avril 2013
Langue : English
Type : Audio
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Matmos - Action at a Distance
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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DJ Dolores - Oslodum 2004 (includes (cc) sample of “Oslodum” by Gilberto Gil)
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Danger Mouse & Jemini - What U Sittin’ On ? (starring Cee Lo and Tha Alkaholiks)
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Cornelius - Wataridori 2
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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The Rapture - Sister Saviour (Blackstrobe Remix)
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
Autres articles (62)
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13 avril 2011, parThe vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
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Participer à sa traduction
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Sur d’autres sites (10668)
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How to write a video encoder with ffmpeg ?
27 décembre 2013, par SunnyShahI want to write an encoder with ffmpeg which can put iFrames (keyframes) at positions I want. Where can I found tutorials or reference material for it ?
P.S
Is it possible to do this with mencoder or any opensource encoder. I want to encode H263 file. I am writing under & for linux. -
flvdec : Stop searching for streams once a audio & a video stream has been found
3 décembre 2011, par Michael Niedermayerflvdec : Stop searching for streams once a audio & a video stream has been found
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How can I capture audio AND video simultenaous with ffmpeg from an USB capture device
5 octobre 2011, par obanI'm capturing a video by means of an USB Terratec Grabster AV350 (which is based on the em2860 chip).
I don't succeed to get the audio when it is played . If I play the captured video with vlc or with ffplay I got only 3 seconds sound and then a silence for the rest of the video ...
During the capturing I don't get any errors. At the end it indicates the size of the video and audio captured ....
I'm using the ffmpeg command for this :
ffmpeg -f alsa -ac 2 -i hw:3 -f video4linux2 -i /dev/video0 -acodec ac3 -ab 128k -vcodec mpeg4 -b 6000k -r 25 test5.avi
The log is :
[alsa @ 0x9bcd420]Estimating duration from bitrate, this may be inaccurate
Input #0, alsa, from 'hw:3' :
Duration : N/A, start : 69930.998994, bitrate : N/A
Stream #0.0 : Audio : pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
[video4linux2 @ 0x9bf5d30]Estimating duration from bitrate, this may be inaccurate
Input #1, video4linux2, from '/dev/video0' :
Duration : N/A, start : 1307111377.654173, bitrate : -2147483 kb/s
Stream #1.0 : Video : rawvideo, yuyv422, 720x576, -2147483 kb/s, 1000k tbr, 1000k tbn, 1000k tbc
[ac3 @ 0x9bf9590]No channel layout specified. The encoder will guess the layout, but it might be incorrect.
Output #0, avi, to 'test5.avi' :
Metadata :
ISFT : Lavf52.64.2
Stream #0.0 : Video : mpeg4, yuv420p, 720x576, q=2-31, 6000 kb/s, 25 tbn, 25 tbc
Stream #0.1 : Audio : ac3, 44100 Hz, stereo, s16, 128 kb/s
Stream mapping :
Stream #1.0 -> #0.0
Stream #0.0 -> #0.1
Press [q] to stop encoding
frame= 1283 fps= 25 q=2.3 Lsize= 38677kB time=51.32 bitrate=6173.9kbits/s
video:37755kB audio:846kB global headers:0kB muxing overhead 0.198922%If I reduce the command for only capturing audio, then the audio file can be played successfully :
ffmpeg -f alsa -ac 2 -i hw:3,0 -acodec ac3 -ab 128k test5.avi
[alsa @ 0x8ede420]Estimating duration from bitrate, this may be inaccurate
Input #0, alsa, from 'hw:3,0' :
Duration : N/A, start : 70395.998935, bitrate : N/A
Stream #0.0 : Audio : pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
[ac3 @ 0x8eebac0]No channel layout specified. The encoder will guess the layout, but it might be incorrect.
Output #0, avi, to 'test5.avi' :
Metadata :
ISFT : Lavf52.64.2
Stream #0.0 : Audio : ac3, 44100 Hz, stereo, s16, 128 kb/s
Stream mapping :
Stream #0.0 -> #0.0
Press [q] to stop encoding
size= 227kB time=13.62 bitrate= 136.8kbits/s
video:0kB audio:213kB global headers:0kB muxing overhead 6.902375%If I run the command for only video capturing then vlc or ffplay can play the video successfully :
ffmpeg -f video4linux2 -i /dev/video0 -vcodec mpeg4 -b 12000k -r 25 test5.avi
[video4linux2 @ 0x91d6420]Estimating duration from bitrate, this may be inaccurate
Input #0, video4linux2, from '/dev/video0' :
Duration : N/A, start : 1307112044.025687, bitrate : -2147483 kb/s
Stream #0.0 : Video : rawvideo, yuyv422, 720x576, -2147483 kb/s, 1000k tbr, 1000k tbn, 1000k tbc
Output #0, avi, to 'test5.avi' :
Metadata :
ISFT : Lavf52.64.2
Stream #0.0 : Video : mpeg4, yuv420p, 720x576, q=2-31, 12000 kb/s, 25 tbn, 25 tbc
Stream mapping :
Stream #0.0 -> #0.0
Press [q] to stop encoding
frame= 388 fps= 25 q=2.0 Lsize= 12963kB time=15.52 bitrate=6842.5kbits/s
video:12949kB audio:0kB global headers:0kB muxing overhead 0.114584%Strange behaviour I noticed is that when I tried capturing video and audio, I can not capture the audio afterwards any more,
unless I unplug the AV350 first.The G350 is located at card 3 :
htpc@htpc-01 :/proc/asound/G350/pcm0c$ more info
card : 3
device : 0
subdevice : 0
stream : CAPTURE
id : USB Audio
name : USB Audio
subname : subdevice #0
class : 0
subclass : 0
subdevices_count : 1
subdevices_avail : 1The OS is a Linux 2.6.38-8-generic with the Ubuntu Natty Narwhal version
Any help on how to tackle this issue would be great ....
Thanks !