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Autres articles (40)
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Support de tous types de médias
10 avril 2011Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)
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HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
For older browsers the Flowplayer flash fallback is used.
MediaSPIP allows for media playback on major mobile platforms with the above (...) -
Support audio et vidéo HTML5
10 avril 2011MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)
Sur d’autres sites (10503)
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Generating synthetic testsrc video counting at 10 fps, first frame is duplicated
19 février 2020, par RotemI am trying to generate synthetic video using FFmpeg.
I want the frame rate to be 10 fps, and I want
testsrccounter to advance every frame.Problem :
When the output file ismp4, the first video frame is duplicated 10 times.Question :
Is it a bug in FFmpeg, or a problem in the command line arguments ?
I am using the following command :
ffmpeg -y -r 10 -f lavfi -i testsrc=duration=10:size=192x108:rate=1 -c:v libx264 vid.mp4- The reason for setting
rate=1is for the counter to advance on each frame.
The generated source pattern is designed to advance the counter every second. - The reason for setting
-r 10before the input, is for "remuxing" the video at 10 fps, and ignoring the timestamps of the input.
I found the syntax in the following post : Using ffmpeg to change framerate :
Remux with new framerate
ffmpeg -y -r 24 -i seeing_noaudio.h264 -c copy seeing.mp4When the output file is
AVIit’s working correctly (first frame is not duplicated) :ffmpeg -y -r 10 -f lavfi -i testsrc=duration=10:size=192x108:rate=1 -c:v libx264 vid.aviWhen generating
AVIat 1 fps, and Remux tomp4at 10 fps, there is a different problem :
The first and second frames are duplicated twice, and the last frame is missing.
Here are the commands :ffmpeg -y -f lavfi -i testsrc=duration=10:size=92x54:rate=1 -c:v libx264 -r 1 vid.avi
ffmpeg -y -r 10 -i vid.avi -c:v copy -r 10 vid.mp4
Parsing the
mp4video toPNGimages :ffmpeg -i vid.mp4 %02d.pngResult :
The first frame is duplicated 10 times.
Parsing the
AVIvideo toPNGimages :
Result :
There are 10 frames as expected. - The reason for setting
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runtime/cgo : pthread_create failed : Resource temporarily unavailable
15 février 2020, par nadermxI currently have this function, that pipes multiple youtubedl commands thru ffmpeg, and then pipes the output of ffmpeg to an HTTP client.
func pipeThruFfmpegToMp4(vi *VideoInfo, rw web.ResponseWriter) error {
var ffmpeg *exec.Cmd
ffmpeg = exec.Command(
"ffmpeg",
"-i", "-",
"-i", "pipe:3",
"-c:v", "copy", "-c:a", "copy",
"-preset", "veryfast",
"-metadata", fmt.Sprintf(`title=%s`, vi.GetTitle()),
"-movflags", "frag_keyframe+empty_moov",
"-f", "mp4",
"-")
youtubevideo := exec.Command(YoutubeDLPath, "-c", "-f", fmt.Sprintf("%s/bestvideo[ext=mp4]/bestvideo/best", vi.GetFormat()), "--no-cache-dir", "--restrict-filenames", "--hls-prefer-native", "-o", "-", fmt.Sprintf("%s", vi.GetVideoUrl()))
fmt.Println(youtubevideo)
youtube := exec.Command(YoutubeDLPath, "-c", "-f", "bestaudio[ext=m4a]/bestaudio/best", "--no-cache-dir", "--restrict-filenames", "--hls-prefer-native", "-o", "-", fmt.Sprintf("%s", vi.GetVideoUrl()))
fmt.Println(youtube)
var ytvbuf, ytbuf, ffbuf bytes.Buffer
youtubevideo.Stderr = &ytvbuf
youtube.Stderr = &ytbuf
ffmpeg.Stderr = &ffbuf
video, err := youtubevideo.StdoutPipe()
if err != nil {
log.Printf("pipeThruFfmpegToMp4: %v\n", err)
return err
}
pipe3, err := youtube.StdoutPipe()
if err != nil {
log.Printf("pipeThruFfmpegToMp4: %v\n", err)
return err
}
ffmpeg.Stdin = video
ffmpeg.ExtraFiles = []*os.File{pipe3.(*os.File)}
ffmpeg.Stdout = rw
// Headers sent, no turning back now
rw.Header().Set("Content-Type", "video/mp4")
rw.Header().Set("Content-Disposition", fmt.Sprintf("attachment;filename=\"%s.mp4\"", vi.GetSlug()))
rw.Flush()
ffmpeg.Start()
youtubevideo.Start()
youtube.Start()
ffmpeg.Wait()
youtubevideo.Wait()
youtube.Wait()
// check ytvbuf, ytbuf, ffbuf for stderr errors
if ffbuf.Len() != 0 {
rollbar.Error(rollbar.ERR, err, &rollbar.Field{"stderr", ffbuf.String()})
log.Printf("pipeThruFfmpegToMp4: %v\n", ffbuf.String())
}
if ytvbuf.Len() != 0 {
rollbar.Error(rollbar.ERR, err, &rollbar.Field{"stderr", ytvbuf.String()})
log.Printf("pipeThruYouTubevDLToMp4: %v\n", ytvbuf.String())
}
if ytbuf.Len() != 0 {
rollbar.Error(rollbar.ERR, err, &rollbar.Field{"stderr", ytbuf.String()})
log.Printf("pipeThruYouTubeDLToMp4: %v\n", ytbuf.String())
}
return nil
}The problem is that everything runs fine, but after a while the ram starts filling up on the server, till it gets to the point that it errors out with
runtime/cgo: pthread_create failed: Resource temporarily unavailableI’m unsure if it’s a memory leak, or if either instance of youtube-dl is not closing right or if ffmpeg isn’t closing right and just consuming more and more ram as the program runs more, until the program crashes with this error
runtime/cgo: pthread_create failed: Resource temporarily unavailable
SIGABRT: abort
PC=0x7f083501fe97 m=128 sigcode=18446744073709551610
goroutine 0 [idle]:
runtime: unknown pc 0x7f083501fe97
stack: frame={sp:0x7f05ff7fd7d0, fp:0x0} stack=[0x7f05feffe288,0x7f05ff7fde88)
00007f05ff7fd6d0: 00007f05ff7fd700 0000ffff00001fa0
00007f05ff7fd6e0: 00007f05ff7fdbe0 00007f05f8000da0
00007f05ff7fd6f0: 0000000000000000 000000000093032c
00007f05ff7fd700: 0000000000000000 00007f0835600ec3
00007f05ff7fd710: 0000000000000005 0000000000000000
00007f05ff7fd720: 000000c0000ce120 00007f0834ff1ce0
00007f05ff7fd730: 00007f05ff7fdaf0 00007f083560870a
00007f05ff7fd740: 0000000000000000 0000000000000000
00007f05ff7fd750: 0000000000000000 00007f05ff7fdbe0
00007f05ff7fd760: 2525252525252525 2525252525252525
00007f05ff7fd770: 000000ffffffffff 0000000000000000
00007f05ff7fd780: 000000ffffffffff 0000000000000000
00007f05ff7fd790: 000000c00010d1a0 000000c000953740
00007f05ff7fd7a0: 000000c0000ce120 000000c000cf2300
00007f05ff7fd7b0: 000000c00010d260 000000c001f4e180
00007f05ff7fd7c0: 000000c001f4e000 000000c00169f680
00007f05ff7fd7d0: <0000000000000000 000000c001f34180
00007f05ff7fd7e0: 6e75720000000000 6f67632f656d6974
00007f05ff7fd7f0: 0000000000000000 0000000000000000
00007f05ff7fd800: 000000c000cf2300 000000c00010d260
00007f05ff7fd810: 000000c001f4e180 000000c001f4e000
00007f05ff7fd820: 000000c00169f680 000000c00169f500
00007f05ff7fd830: 000000c001f34180 000000c001f34000
00007f05ff7fd840: 000000c000c92780 000000c001ec2600
00007f05ff7fd850: fffffffe7fffffff ffffffffffffffff
00007f05ff7fd860: ffffffffffffffff ffffffffffffffff
00007f05ff7fd870: ffffffffffffffff ffffffffffffffff
00007f05ff7fd880: ffffffffffffffff ffffffffffffffff
00007f05ff7fd890: ffffffffffffffff ffffffffffffffff
00007f05ff7fd8a0: ffffffffffffffff ffffffffffffffff
00007f05ff7fd8b0: ffffffffffffffff ffffffffffffffff
00007f05ff7fd8c0: ffffffffffffffff ffffffffffffffff
runtime: unknown pc 0x7f083501fe97
stack: frame={sp:0x7f05ff7fd7d0, fp:0x0} stack=[0x7f05feffe288,0x7f05ff7fde88)
00007f05ff7fd6d0: 00007f05ff7fd700 0000ffff00001fa0
00007f05ff7fd6e0: 00007f05ff7fdbe0 00007f05f8000da0
00007f05ff7fd6f0: 0000000000000000 000000000093032c
00007f05ff7fd700: 0000000000000000 00007f0835600ec3
00007f05ff7fd710: 0000000000000005 0000000000000000I’ve also tried building the binary with
CGO_ENABLED=0even though I don’t even have aimport "c"but that also ends up erroring out as well withruntime: failed to create new OS thread (have 21 already; errno=11)
runtime: may need to increase max user processes (ulimit -u)
fatal error: newosprocmy limit’s are already very generouse, which maybe could also be a problem ? Or do I maybe have to increase the pipe size ?
$ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 192907
max locked memory (kbytes, -l) 16384
max memory size (kbytes, -m) unlimited
open files (-n) 100000
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 65536
cpu time (seconds, -t) unlimited
max user processes (-u) 63883
virtual memory (kbytes, -v) unlimitedEither way, I apprecate any and all the help I can get on this. Here is a link to the entire program and here is a thread in the golang-nuts forum regarding this questions
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Python FFmpeg : Setting VBR and BT.709
14 décembre 2019, par CryptonautI’m using this Python library to programmatically generate a short video using an image (.png) as input. The video needs to match the specifications of another video created by someone else.
The key differences between my output and the other are the following (these are the media attributes I desire to have) :
- BitRate_Mode : VBR
colour_primaries : BT.709(Solved via the comment made by Rotem - updated my code example to include the solution)
How would I achieve VBR ? It was my understanding ProRes 422 HQ natively used unconstrained VBR yet my output specifies CBR.
Secondly, as can be seen from my code, I’m attempting to conform to BT.709. However, my media information output does not specify this. What am I doing incorrectly ?Here’s my code :
image = ffmpeg.input(input_image, t='00:00:10', framerate='24000/1001', loop='1', probesize='42M')
output = ffmpeg.output(image, output_video,
f='mov',
vcodec='prores_ks',
vprofile='3',
pix_fmt='yuv422p10le',
g='48',
video_track_timescale='24000',
movflags='use_metadata_tags',
timecode='00:00:00:00',
color_primaries='bt709',
color_trc='bt709',
colorspace='bt709',
qcomp='1',
# BT.709 issue solved by adding the bsf option as seen via the line below
bsf='prores_metadata=color_primaries=bt709:color_trc=bt709:colorspace=bt709',
vf='scale=in_range=full:in_color_matrix=bt709:out_range=full:out_color_matrix=bt709')
output.run()Here’s the media information produced by my output :
{
"media":{
"@ref":"Redacted",
"track":[
{
"@type":"General",
"VideoCount":"1",
"OtherCount":"1",
"FileExtension":"mov",
"Format":"MPEG-4",
"Format_Profile":"QuickTime",
"CodecID":"qt ",
"CodecID_Version":"0000.02",
"CodecID_Compatible":"qt ",
"FileSize":"196366623",
"Duration":"10.010",
"OverallBitRate":"156936362",
"FrameRate":"23.976",
"FrameCount":"240",
"StreamSize":"2463",
"HeaderSize":"28",
"DataSize":"196364172",
"FooterSize":"2423",
"IsStreamable":"No",
"File_Created_Date":"UTC 2019-12-13 19:26:37.150",
"File_Created_Date_Local":"2019-12-13 19:26:37.150",
"File_Modified_Date":"UTC 2019-12-13 19:27:20.303",
"File_Modified_Date_Local":"2019-12-13 19:27:20.303"
},
{
"@type":"Video",
"StreamOrder":"0",
"ID":"1",
"Format":"ProRes",
"Format_Version":"0",
"Format_Profile":"422 HQ",
"CodecID":"apch",
"Duration":"10.010",
"BitRate_Mode":"CBR",
"BitRate":"156934237",
"Width":"1920",
"Height":"1080",
"Sampled_Width":"1920",
"Sampled_Height":"1080",
"PixelAspectRatio":"1.000",
"DisplayAspectRatio":"1.778",
"Rotation":"0.000",
"FrameRate_Mode":"CFR",
"FrameRate":"23.976",
"FrameCount":"240",
"ColorSpace":"YUV",
"ChromaSubsampling":"4:2:2",
"ScanType":"Progressive",
"Delay":"0.000",
"StreamSize":"196364160",
"Encoded_Library":"Lavc",
"colour_description_present":"Yes",
"colour_description_present_Source":"Stream",
"colour_primaries_Source":"Stream",
"transfer_characteristics_Source":"Stream",
"matrix_coefficients_Source":"Stream"
},
{
"@type":"Other",
"StreamOrder":"1",
"ID":"2",
"Type":"Time code",
"Format":"QuickTime TC",
"Duration":"10.010",
"FrameRate":"23.976",
"TimeCode_FirstFrame":"00:00:00:00",
"TimeCode_Striped":"Yes",
"Language":"en",
"Default":"No"
}
]
}
}Here’s the media information spec I’m trying to match :
{
"media":{
"@ref":"Redacted",
"track":[
{
"@type":"General",
"VideoCount":"1",
"OtherCount":"1",
"FileExtension":"mov",
"Format":"MPEG-4",
"Format_Profile":"QuickTime",
"CodecID":"qt ",
"CodecID_Version":"2005.03",
"CodecID_Compatible":"qt ",
"FileSize":"1397430682",
"Duration":"70.737",
"OverallBitRate_Mode":"VBR",
"OverallBitRate":"158042403",
"FrameRate":"23.976",
"FrameCount":"1696",
"StreamSize":"9898",
"HeaderSize":"28",
"DataSize":"1397420796",
"FooterSize":"9858",
"IsStreamable":"No",
"Encoded_Date":"UTC 2019-04-29 22:26:32",
"Tagged_Date":"UTC 2019-04-29 22:26:32",
"File_Created_Date":"UTC 2019-12-12 16:52:57.215",
"File_Created_Date_Local":"2019-12-12 16:52:57.215",
"File_Modified_Date":"UTC 2019-12-12 17:25:58.903",
"File_Modified_Date_Local":"2019-12-12 17:25:58.903",
"Encoded_Application":"DVP Factory r561 (2019-04-25), Host: dvp07"
},
{
"@type":"Video",
"StreamOrder":"0",
"ID":"1",
"Format":"ProRes",
"Format_Version":"0",
"Format_Profile":"422 HQ",
"CodecID":"apch",
"Duration":"70.737",
"Duration_LastFrame":"-0.000",
"BitRate_Mode":"VBR",
"BitRate":"158040381",
"Width":"1920",
"Height":"1080",
"Sampled_Width":"1920",
"Sampled_Height":"1080",
"PixelAspectRatio":"1.000",
"DisplayAspectRatio":"1.778",
"Rotation":"0.000",
"FrameRate_Mode":"CFR",
"FrameRate":"23.976",
"FrameCount":"1696",
"ColorSpace":"YUV",
"ChromaSubsampling":"4:2:2",
"ScanType":"Progressive",
"Delay":"0.000",
"StreamSize":"1397420784",
"Encoded_Library":"agi0",
"Language":"en",
"Encoded_Date":"UTC 2019-04-29 22:26:32",
"Tagged_Date":"UTC 2019-04-29 22:26:32",
"colour_description_present":"Yes",
"colour_description_present_Source":"Container / Stream",
"colour_primaries":"BT.709",
"colour_primaries_Source":"Container",
"colour_primaries_Original_Source":"Stream",
"transfer_characteristics":"BT.709",
"transfer_characteristics_Source":"Container",
"transfer_characteristics_Original_Source":"Stream",
"matrix_coefficients":"BT.709",
"matrix_coefficients_Source":"Container / Stream"
},
{
"@type":"Other",
"StreamOrder":"1",
"ID":"2",
"Type":"Time code",
"Format":"QuickTime TC",
"Duration":"70.737",
"FrameRate":"23.976",
"TimeCode_FirstFrame":"00:00:00:00",
"TimeCode_Striped":"Yes",
"Language":"en",
"extra":{
"Encoded_Date":"UTC 2019-04-29 22:26:32",
"Tagged_Date":"UTC 2019-04-29 22:26:32"
}
}
]
}
}
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