Re: [whatwg] Recorder audio and save to server
Hi Rob, I have downloaded the blob and checked, yes, it is Ogg data. So Firefox MediaRecorder API is excellent. https://wiki.mozilla.org/Gecko:MediaRecorder - Diagram include all the codec which we are talking about. Finally, My second problem was also solved by API itself. http://w3c.github.io/mediacapture-record/MediaRecorder.html#widl-MediaRecorder-start-void-long-timeslice start Method accept timeslice as parameter. So when I provided timeslice parameter, like 2000, I was getting blob using dataavailable event. Fantastic ! Back to coding. I will use MediaRecorder API and will wait for the chrome to solve the bug - https://code.google.com/p/chromium/issues/detail?id=262211 2015-04-07 11:30 GMT+05:30 Narendra Sisodiya naren...@narendrasisodiya.com : Thanks, I am checking all these. @ Rob, I have seen MediaRecorder API, yesterday. It is the API for the exact same purpose I want but I have two unanswered question regrading API. 1) No where, they have mentioned about the encoding format. I have tested working demo but still still unable to figure about its encoding format. Probably I will try to download blob and check. 2) I think, MediaRecorder API like this, Start Recoding, wait, Stop recording, then get the encoded blob. This is suitable for small duration audio recording. I want recording for long duration like 1 hour. Encoding at the end of the lecture will hang my CPU and take long time to upload whole blob. What I want, every 2 or 5 second, I should get encoded blob for that much duration and I will send that small encoded blob using websocket. So its like continuous encoding and transmitting to server. 2015-04-07 9:50 GMT+05:30 Robert O'Callahan rob...@ocallahan.org: On Sat, Apr 4, 2015 at 9:28 PM, Narendra Sisodiya naren...@narendrasisodiya.com wrote: Hi, I am trying to do simple audio recording service. with help of navigator.getUserMedia, I am able to record audio in wav format. MediaRecorder is designed for exactly this. https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder_API Rob -- oIo otoeololo oyooouo otohoaoto oaonoyooonoeo owohooo oioso oaonogoroyo owoiotoho oao oboroootohoeoro oooro osoiosotoeoro owoiololo oboeo osouobojoeocoto otooo ojouodogomoeonoto.o oAogoaoiono,o oaonoyooonoeo owohooo osoaoyoso otooo oao oboroootohoeoro oooro osoiosotoeoro,o o‘oRoaocoao,o’o oioso oaonosowoeoroaoboloeo otooo otohoeo ocooouoroto.o oAonodo oaonoyooonoeo owohooo osoaoyoso,o o‘oYooouo ofolo!o’o owoiololo oboeo oiono odoaonogoeoro ooofo otohoeo ofoioroeo ooofo ohoeololo. -- *Narendra SisodiyaUI Architect @ *Unicommerce http://www.unicommerce.com Delhi - Bharat -- *Narendra SisodiyaUI Architect @ *Unicommerce http://www.unicommerce.com Delhi - Bharat
Re: [whatwg] Recorder audio and save to server
Thanks, I am checking all these. @ Rob, I have seen MediaRecorder API, yesterday. It is the API for the exact same purpose I want but I have two unanswered question regrading API. 1) No where, they have mentioned about the encoding format. I have tested working demo but still still unable to figure about its encoding format. Probably I will try to download blob and check. 2) I think, MediaRecorder API like this, Start Recoding, wait, Stop recording, then get the encoded blob. This is suitable for small duration audio recording. I want recording for long duration like 1 hour. Encoding at the end of the lecture will hang my CPU and take long time to upload whole blob. What I want, every 2 or 5 second, I should get encoded blob for that much duration and I will send that small encoded blob using websocket. So its like continuous encoding and transmitting to server. 2015-04-07 9:50 GMT+05:30 Robert O'Callahan rob...@ocallahan.org: On Sat, Apr 4, 2015 at 9:28 PM, Narendra Sisodiya naren...@narendrasisodiya.com wrote: Hi, I am trying to do simple audio recording service. with help of navigator.getUserMedia, I am able to record audio in wav format. MediaRecorder is designed for exactly this. https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder_API Rob -- oIo otoeololo oyooouo otohoaoto oaonoyooonoeo owohooo oioso oaonogoroyo owoiotoho oao oboroootohoeoro oooro osoiosotoeoro owoiololo oboeo osouobojoeocoto otooo ojouodogomoeonoto.o oAogoaoiono,o oaonoyooonoeo owohooo osoaoyoso otooo oao oboroootohoeoro oooro osoiosotoeoro,o o‘oRoaocoao,o’o oioso oaonosowoeoroaoboloeo otooo otohoeo ocooouoroto.o oAonodo oaonoyooonoeo owohooo osoaoyoso,o o‘oYooouo ofolo!o’o owoiololo oboeo oiono odoaonogoeoro ooofo otohoeo ofoioroeo ooofo ohoeololo. -- *Narendra SisodiyaUI Architect @ *Unicommerce http://www.unicommerce.com Delhi - Bharat
Re: [whatwg] Recorder audio and save to server
I've brought this up on other lists, but I think it's worth bringing up again here: it's a significant limitation in MediaRecorder that it can only work in real-time. If a user has a pre-recorded WAV file which is one hour long and they want to upload that or encode it to a different format, MediaRecorder requires that the encoding happen in real-time. So the user has to sit there and wait for an hour when it could be seconds to minutes if it could work faster. So I think there are still important use cases for uploading audio that MediaRecorder doesn't cover. My preferred solution would be to allow MediaRecorder to accept an AudioBuffer instead of a MediaStream, and in this case allow it to encode as fast as possible. Ashley On 7 April 2015 at 09:14, Narendra Sisodiya naren...@narendrasisodiya.com wrote: Hi Rob, I have downloaded the blob and checked, yes, it is Ogg data. So Firefox MediaRecorder API is excellent. https://wiki.mozilla.org/Gecko:MediaRecorder - Diagram include all the codec which we are talking about. Finally, My second problem was also solved by API itself. http://w3c.github.io/mediacapture-record/MediaRecorder.html#widl-MediaRecorder-start-void-long-timeslice start Method accept timeslice as parameter. So when I provided timeslice parameter, like 2000, I was getting blob using dataavailable event. Fantastic ! Back to coding. I will use MediaRecorder API and will wait for the chrome to solve the bug - https://code.google.com/p/chromium/issues/detail?id=262211 2015-04-07 11:30 GMT+05:30 Narendra Sisodiya naren...@narendrasisodiya.com : Thanks, I am checking all these. @ Rob, I have seen MediaRecorder API, yesterday. It is the API for the exact same purpose I want but I have two unanswered question regrading API. 1) No where, they have mentioned about the encoding format. I have tested working demo but still still unable to figure about its encoding format. Probably I will try to download blob and check. 2) I think, MediaRecorder API like this, Start Recoding, wait, Stop recording, then get the encoded blob. This is suitable for small duration audio recording. I want recording for long duration like 1 hour. Encoding at the end of the lecture will hang my CPU and take long time to upload whole blob. What I want, every 2 or 5 second, I should get encoded blob for that much duration and I will send that small encoded blob using websocket. So its like continuous encoding and transmitting to server. 2015-04-07 9:50 GMT+05:30 Robert O'Callahan rob...@ocallahan.org: On Sat, Apr 4, 2015 at 9:28 PM, Narendra Sisodiya naren...@narendrasisodiya.com wrote: Hi, I am trying to do simple audio recording service. with help of navigator.getUserMedia, I am able to record audio in wav format. MediaRecorder is designed for exactly this. https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder_API Rob -- oIo otoeololo oyooouo otohoaoto oaonoyooonoeo owohooo oioso oaonogoroyo owoiotoho oao oboroootohoeoro oooro osoiosotoeoro owoiololo oboeo osouobojoeocoto otooo ojouodogomoeonoto.o oAogoaoiono,o oaonoyooonoeo owohooo osoaoyoso otooo oao oboroootohoeoro oooro osoiosotoeoro,o o‘oRoaocoao,o’o oioso oaonosowoeoroaoboloeo otooo otohoeo ocooouoroto.o oAonodo oaonoyooonoeo owohooo osoaoyoso,o o‘oYooouo ofolo!o’o owoiololo oboeo oiono odoaonogoeoro ooofo otohoeo ofoioroeo ooofo ohoeololo. -- *Narendra SisodiyaUI Architect @ *Unicommerce http://www.unicommerce.com Delhi - Bharat -- *Narendra SisodiyaUI Architect @ *Unicommerce http://www.unicommerce.com Delhi - Bharat
Re: [whatwg] Recorder audio and save to server
Hi Ashley, yes, MediaRecorder must accept AudioBuffer. but current spec http://w3c.github.io/mediacapture-record/MediaRecorder.html#widl-MediaRecorder-stream mention that source should be type MediaStream. Good to see your filed bug - https://github.com/w3c/mediacapture-record/issues/6 currently I am trying to record seminar/lecture. so this will not be a problem. 2015-04-07 17:10 GMT+05:30 Ashley Gullen ash...@scirra.com: I've brought this up on other lists, but I think it's worth bringing up again here: it's a significant limitation in MediaRecorder that it can only work in real-time. If a user has a pre-recorded WAV file which is one hour long and they want to upload that or encode it to a different format, MediaRecorder requires that the encoding happen in real-time. So the user has to sit there and wait for an hour when it could be seconds to minutes if it could work faster. So I think there are still important use cases for uploading audio that MediaRecorder doesn't cover. My preferred solution would be to allow MediaRecorder to accept an AudioBuffer instead of a MediaStream, and in this case allow it to encode as fast as possible. Ashley On 7 April 2015 at 09:14, Narendra Sisodiya naren...@narendrasisodiya.com wrote: Hi Rob, I have downloaded the blob and checked, yes, it is Ogg data. So Firefox MediaRecorder API is excellent. https://wiki.mozilla.org/Gecko:MediaRecorder - Diagram include all the codec which we are talking about. Finally, My second problem was also solved by API itself. http://w3c.github.io/mediacapture-record/MediaRecorder.html#widl-MediaRecorder-start-void-long-timeslice start Method accept timeslice as parameter. So when I provided timeslice parameter, like 2000, I was getting blob using dataavailable event. Fantastic ! Back to coding. I will use MediaRecorder API and will wait for the chrome to solve the bug - https://code.google.com/p/chromium/issues/detail?id=262211 2015-04-07 11:30 GMT+05:30 Narendra Sisodiya naren...@narendrasisodiya.com : Thanks, I am checking all these. @ Rob, I have seen MediaRecorder API, yesterday. It is the API for the exact same purpose I want but I have two unanswered question regrading API. 1) No where, they have mentioned about the encoding format. I have tested working demo but still still unable to figure about its encoding format. Probably I will try to download blob and check. 2) I think, MediaRecorder API like this, Start Recoding, wait, Stop recording, then get the encoded blob. This is suitable for small duration audio recording. I want recording for long duration like 1 hour. Encoding at the end of the lecture will hang my CPU and take long time to upload whole blob. What I want, every 2 or 5 second, I should get encoded blob for that much duration and I will send that small encoded blob using websocket. So its like continuous encoding and transmitting to server. 2015-04-07 9:50 GMT+05:30 Robert O'Callahan rob...@ocallahan.org: On Sat, Apr 4, 2015 at 9:28 PM, Narendra Sisodiya naren...@narendrasisodiya.com wrote: Hi, I am trying to do simple audio recording service. with help of navigator.getUserMedia, I am able to record audio in wav format. MediaRecorder is designed for exactly this. https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder_API Rob -- oIo otoeololo oyooouo otohoaoto oaonoyooonoeo owohooo oioso oaonogoroyo owoiotoho oao oboroootohoeoro oooro osoiosotoeoro owoiololo oboeo osouobojoeocoto otooo ojouodogomoeonoto.o oAogoaoiono,o oaonoyooonoeo owohooo osoaoyoso otooo oao oboroootohoeoro oooro osoiosotoeoro,o o‘oRoaocoao,o’o oioso oaonosowoeoroaoboloeo otooo otohoeo ocooouoroto.o oAonodo oaonoyooonoeo owohooo osoaoyoso,o o‘oYooouo ofolo!o’o owoiololo oboeo oiono odoaonogoeoro ooofo otohoeo ofoioroeo ooofo ohoeololo. -- *Narendra SisodiyaUI Architect @ *Unicommerce http://www.unicommerce.com Delhi - Bharat -- *Narendra SisodiyaUI Architect @ *Unicommerce http://www.unicommerce.com Delhi - Bharat -- *Narendra SisodiyaUI Architect @ *Unicommerce http://www.unicommerce.com Delhi - Bharat
Re: [whatwg] Recorder audio and save to server
On Tue, Apr 7, 2015 at 11:40 PM, Ashley Gullen ash...@scirra.com wrote: I've brought this up on other lists, but I think it's worth bringing up again here: it's a significant limitation in MediaRecorder that it can only work in real-time. If a user has a pre-recorded WAV file which is one hour long and they want to upload that or encode it to a different format, MediaRecorder requires that the encoding happen in real-time. So the user has to sit there and wait for an hour when it could be seconds to minutes if it could work faster. So I think there are still important use cases for uploading audio that MediaRecorder doesn't cover. My preferred solution would be to allow MediaRecorder to accept an AudioBuffer instead of a MediaStream, and in this case allow it to encode as fast as possible. In Gecko, MediaRecorder has a constructor that accepts an AudioNode. This AudioNode can belong to an OfflineAudioContext, which solves your use-case. This extension was proposed and accepted on public-media-capture though the spec hasn't been updated yet. Rob -- oIo otoeololo oyooouo otohoaoto oaonoyooonoeo owohooo oioso oaonogoroyo owoiotoho oao oboroootohoeoro oooro osoiosotoeoro owoiololo oboeo osouobojoeocoto otooo ojouodogomoeonoto.o oAogoaoiono,o oaonoyooonoeo owohooo osoaoyoso otooo oao oboroootohoeoro oooro osoiosotoeoro,o o‘oRoaocoao,o’o oioso oaonosowoeoroaoboloeo otooo otohoeo ocooouoroto.o oAonodo oaonoyooonoeo owohooo osoaoyoso,o o‘oYooouo ofolo!o’o owoiololo oboeo oiono odoaonogoeoro ooofo otohoeo ofoioroeo ooofo ohoeololo.
Re: [whatwg] Recorder audio and save to server
I would convert PCM at client. Not sure if this fits your needs, but heck out: https://github.com/audiocogs/ogg.js Definitely use websockets. socket.io is what you want. You don't need another else. Something to consider: if you've going to be playing back the recorded audio (or broadcasting it), I'd look into compressing it even more to optimize your bandwidth usage. On Sat, Apr 4, 2015 at 4:28 AM, Narendra Sisodiya naren...@narendrasisodiya.com wrote: Hi, I am trying to do simple audio recording service. with help of navigator.getUserMedia, I am able to record audio in wav format. Here are some question. 1) Should I encode PCM data into ogg format at client end using some web worker or should I directly send PCM data to server. or encode into wav format and send multiple wav file. Server will combine it. 2) should I use websocket or XHR ? 3) I am using nodejs at server side. do I need to switch to any another technology? I only know JavaScript well. 4) The audio duration will be like 30 minutes to 1 hour. -- *Narendra SisodiyaUI Architect @ *Unicommerce http://www.unicommerce.com Delhi - Bharat -- “If the American people ever allow private banks to control the issue of their currency, first by inflation, then by deflation, the banks...will deprive the people of all property until their children wake-up homeless on the continent their fathers conquered... The issuing power should be taken from the banks and restored to the people, to whom it properly belongs. -- Thomas Jefferson Government big enough to supply everything...is big enough to take everything you have. The course of history shows that as a government grows, liberty decreases --- Thomas Jefferson www.CampaignForLiberty.org
Re: [whatwg] Recorder audio and save to server
On 2015-04-07 03:29, Grover Blue wrote: I would convert PCM at client. Not sure if this fits your needs, but heck out: https://github.com/audiocogs/ogg.js Definitely use websockets. socket.io is what you want. You don't need another else. Something to consider: if you've going to be playing back the recorded audio (or broadcasting it), I'd look into compressing it even more to optimize your bandwidth usage. I'll second the use of websockets. You might also want to look at http://stackoverflow.com/questions/20548629/how-can-i-use-opus-codec-from-javascript The answer from Rainer Rillke is rather impressive and include FLAC and Opus support via javascript frameworks. I'd suggest FLAC for lossless audio and Ogg Opus for lossy, there are also no licensing/royalty/patent issues with these codecs. With Ogg Opus you may be able to leverage existing Opus support in the browser. -- Roger Hågensen, Freelancer, http://skuldwyrm.no/
Re: [whatwg] Recorder audio and save to server
On Sat, Apr 4, 2015 at 9:28 PM, Narendra Sisodiya naren...@narendrasisodiya.com wrote: Hi, I am trying to do simple audio recording service. with help of navigator.getUserMedia, I am able to record audio in wav format. MediaRecorder is designed for exactly this. https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder_API Rob -- oIo otoeololo oyooouo otohoaoto oaonoyooonoeo owohooo oioso oaonogoroyo owoiotoho oao oboroootohoeoro oooro osoiosotoeoro owoiololo oboeo osouobojoeocoto otooo ojouodogomoeonoto.o oAogoaoiono,o oaonoyooonoeo owohooo osoaoyoso otooo oao oboroootohoeoro oooro osoiosotoeoro,o o‘oRoaocoao,o’o oioso oaonosowoeoroaoboloeo otooo otohoeo ocooouoroto.o oAonodo oaonoyooonoeo owohooo osoaoyoso,o o‘oYooouo ofolo!o’o owoiololo oboeo oiono odoaonogoeoro ooofo otohoeo ofoioroeo ooofo ohoeololo.
[whatwg] Recorder audio and save to server
Hi, I am trying to do simple audio recording service. with help of navigator.getUserMedia, I am able to record audio in wav format. Here are some question. 1) Should I encode PCM data into ogg format at client end using some web worker or should I directly send PCM data to server. or encode into wav format and send multiple wav file. Server will combine it. 2) should I use websocket or XHR ? 3) I am using nodejs at server side. do I need to switch to any another technology? I only know JavaScript well. 4) The audio duration will be like 30 minutes to 1 hour. -- *Narendra SisodiyaUI Architect @ *Unicommerce http://www.unicommerce.com Delhi - Bharat
