Error while playing record audio from webcam

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Error while playing record audio from webcam

Vijay Rakesh Munganda
Hi All,

I’m using below command to create video and audio files for real time streaming to the cloud.

ffmpeg -f alsa -channels 1 -thread_queue_size 1024 -i hw:1 -f video4linux2 -i /dev/video0 -c:a aac -ar 48k -t 0:10 -segment_time 00:00.08 -f stream_segment sample-%003d.aac -c:v h264 -force_key_frames "expr:gte(t,n_forced*0.08)" -pix_fmt yuv420p -s:v 640x480 -t 0:10 -r 25 -g 1 -segment_time 00:00.08 -f stream_segment frame-%003d.h264

When I use ffplay on video clips it is playing, but when I run audio clips I get different errors for different segmented output as follows, and some clips play for more than 13s when segment given as 80ms.

Error:
Error: sample-000.aac: Invalid data found when processing input 0B f=0/0

[mpegts @ 0x7f6f30000b80] Format mpegts detected only with low score of 2, misdetection possible!

[mpegts @ 0x7f6f30000b80] Could not detect TS packet size, defaulting to non-FEC/DVHS sample-001.aac: could not find codec parameters

Did I miss anything in the command?

Thanks & Regards,
Vijay Rakesh


Thanks & Regards,
Vijay Rakesh
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Re: Error while playing record audio from webcam

Vijay Rakesh Munganda
Hi,

I just tried to record only audio by running below command.
ffmpeg -f alsa -channels 1 -i hw:1 -c:a aac -ar 48k -t 0:10 sample.aac
When play sample.aac file using ffplay it started to play which I have recorded then after it continued to play with silent output. How to solve above issue?

Thanks & Regards,
Vijay Rakesh

> On 19-Jan-2021, at 10:27, Vijay Rakesh Munganda <[hidden email]> wrote:
>
> 
> Hi All,
>
> I’m using below command to create video and audio files for real time streaming to the cloud.
>
> ffmpeg -f alsa -channels 1 -thread_queue_size 1024 -i hw:1 -f video4linux2 -i /dev/video0 -c:a aac -ar 48k -t 0:10 -segment_time 00:00.08 -f stream_segment sample-%003d.aac -c:v h264 -force_key_frames "expr:gte(t,n_forced*0.08)" -pix_fmt yuv420p -s:v 640x480 -t 0:10 -r 25 -g 1 -segment_time 00:00.08 -f stream_segment frame-%003d.h264
>
> When I use ffplay on video clips it is playing, but when I run audio clips I get different errors for different segmented output as follows, and some clips play for more than 13s when segment given as 80ms.
>
> Error:
> Error: sample-000.aac: Invalid data found when processing input 0B f=0/0
>
> [mpegts @ 0x7f6f30000b80] Format mpegts detected only with low score of 2, misdetection possible!
>
> [mpegts @ 0x7f6f30000b80] Could not detect TS packet size, defaulting to non-FEC/DVHS sample-001.aac: could not find codec parameters
>
> Did I miss anything in the command?
>
> Thanks & Regards,
> Vijay Rakesh
>
>
> Thanks & Regards,
> Vijay Rakesh
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Re: Error while playing record audio from webcam

Carl Zwanzig
On 1/19/2021 4:18 AM, Vijay Rakesh Munganda wrote:
> How to solve above issue?

You start by posting the complete command output so we can see what what's
going on.

(and please don't top-post on this list)

z!
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