[FFmpeg-user] Sync. Issue. Video Gradually Falls Behind

[Thomas Seilund]

On 1/26/21 6:01 PM, Carl Eugen Hoyos wrote:
> Am Di., 26. Jan. 2021 um 16:51 Uhr schrieb Thomas Seilund via
> ffmpeg-user <ffmpeg-user at ffmpeg.org>:
>
>> Input #0, h264, from 'pipe:':
>>     Duration: N/A, bitrate: N/A
>>       Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x720, 25
>> fps, 25 tbr, 1200k tbn, 50 tbc
>> Guessed Channel Layout for Input Stream #1.0 : stereo
>> Input #1, pulse, from
>> 'alsa_input.usb-046d_HD_Pro_Webcam_C920_9D715A9F-02.analog-stereo':
>>     Duration: N/A, start: 1611673439.592751, bitrate: 1536 kb/s
>>       Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
>> Guessed Channel Layout for Input Stream #2.0 : stereo
>> Input #2, pulse, from
>> 'alsa_output.platform-bcm2835_audio.analog-stereo.monitor':
>>     Duration: N/A, start: 1611673439.612473, bitrate: 1536 kb/s
>>       Stream #2:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
> I don't think you can synchronize a stream with no start time with
> two streams with start time, at least not without additional options.
>
> Carl Eugen
> _______________________________________________

I assume you mean that the video stream does not have a start time and 
the two audio streams do.

Can I set the start time for the video stream to avoid video from 
falling more and more behind?

Or can set additional options to avoid video from falling more and more 
behind?

Thanks

Thomas S