Can't play .mp4 generated from .mjr with janus-pp-rec

[Rhythm Chopra]

I am recording an incoming h264 encoded RTP video stream by sending start and stop messages to Janus API. And after recording , I'm trying to convert .mjr file to .mp4 so that it can be played with any Media Player. But as of now, media player throws error `Gstreamer encountered a general stream error.` 

I tried playing file using gstreamer filesrc, even it throws the same error.

I tried playing it with Browsers and Firefox can play the stream but Chrome can't. don't know why.

P.S.:

During conversion, janus-pp-rec logs a warning `Profile is not baseline (100!=66)`.

Please suggest what could be wrong.

Regards

Rhythm

[Anil Wadghule]

You can use ffmpeg to convert webm files which are generated by janus-pp-rec no?

Thanks,

Anil

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[Rhythm Chopra]

As far I understand, I can't. Because janus-pp-rec only allow conversion to mp4 in case of h264 encoded stream. So I no way can generate .webm from .mjr.

[Rhythm Chopra]

And its not that .mjr is also corrupted, I can play the same .mjr file in recordplaytest demo.

So, something is wrong in the conversion only.

Please suggest 

Regards

Rhythm

[Anil Wadghule]

Are you on Mac?

Try with Linux if possible

Thanks,

Anil

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Best,

Anil

[Rhythm Chopra]

I'm on Linux only. I never mentioned Mac.

[Lorenzo Miniero]

Try re-encoding the mp4 janus-pp-rec generated, with ffmpeg or gstreamer. If it works in some players and doesn't in others, it might be an issue with the container we wrote, so re-encoding it should fix it. Make also sure you're using the latest code, as we recently fixed something in the post processor with respect to H.264.

L.

[Rhythm Chopra]

Actually, I'm using refcount branch of Janus. Just want to know that whether the updates are available on it or not?

Regards

Rhythm

[Rhythm Chopra]

Moreover, even gstreamer can't play the file (as I mentioned above).

Following is the gstreamer logs, when I try to play file using filesrc

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0: GStreamer encountered a general stream error.
Additional debug info:
qtdemux.c(5520): gst_qtdemux_loop (): /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
streaming stopped, reason not-negotiated
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

On Friday, March 9, 2018 at 8:17:16 PM UTC+5:30, Lorenzo Miniero wrote:

[Rhythm Chopra]

I just updated the branch the rebuild janus. 

Same error persists.

Regards,

Rhythm

[Lorenzo Miniero]

As I said, you'll need to re-encode or regenerate the MP4 container then, from the .mp4 file you got from janus-pp-rec. 

L.

[Rhythm Chopra]

Could you please direct me how to do that?

I tried applying demux and again mp4mux on the generated file. But gstreamer throws the following error:

Setting pipeline to PAUSED ...

Pipeline is PREROLLING ...

ERROR: from element /GstPipeline:pipeline0/GstQTDemux:qtdemux0: GStreamer encountered a general stream error.

Additional debug info:

qtdemux.c(5520): gst_qtdemux_loop (): /GstPipeline:pipeline0/GstQTDemux:qtdemux0:

streaming stopped, reason not-negotiated

ERROR: pipeline doesn't want to preroll.

Setting pipeline to NULL ...

Freeing pipeline ...

pipeline I'm using is 

gst-launch-1.0 filesrc location=video.mp4 ! qtdemux ! h264parse ! mp4mux ! filesink location=result.mp4

Please suggest.

Regards

Rhythm

[Rhythm Chopra]

Actually, the above pipeline works fine for other mp4 files, So I think it should do what you are asking me to do.

Please correct if I'm wrong.

Regards,

Rhythm

[Rhythm Chopra]

Should I open a git issue for the same as well.?

Regards,

Rhythm

[Lorenzo Miniero]

Sorry, I'm not going to fix this, as I don't believe it's an issue (works in some players). I already did all I could with a proprietary codec and format. Contributions are welcome of course.

L. 

[Rhythm Chopra]

But it doesn't play anywhere except Firefox. 

[Anil Wadghule]

@Rhythm Try using another computer may be another environment. No one is facing this currently. If you can reproduce on another environment, you can create a GitHub issue.

Anil 

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Best,

Anil

[Rhythm Chopra]

Actually, I was trying to figure out whats wrong.

I found out that, gstreamer can play the generated mp4 file using filesrc if I use `qtdemux` before `decodebin` folllowed by `videoconvert` and `autovideosink`. While normal mp4 can be played even by omitting`qtdemux`.

So, it must be the reason, video players are unable to play the file. There must be something which needs to added to mp4 container so that I don't have to use demuxer explicitly in gstreamer pipeline. I need to play this file using normal players, but I don't have any idea, what needs to be done on the container side to achieve it.

Please suggest.

Regards,

Rhythm

Best,

Anil