[FFmpeg-user] Need Help For Splitting, Re-Encoding and Joining again

[Faraz Ahmed]

Thanks for your reply i have not just mp4 files they can be any format like
.avi, .mov, .mkv etc
And for MP4 if we change it to .ts then again we need to convert it to MP4
i don't think this will fix the issue.

Thanks,
Faraz

On Thu, Mar 29, 2018 at 9:57 PM, Gabriel Balaich <roderrooder at gmail.com>
wrote:

> On Thu, Mar 29, 2018 at 10:56 AM, Gabriel Balaich <roderrooder at gmail.com>
> wrote:
>
> > Try using .ts instead of mp4, they seem to segment better, end result can
> > still
> > be converted back to .mp4.
> >
> > 1) ffmpeg -i F:\video_data_set\4k_compressed.mp4 -f segment
> > -segment_time 5 -segment_start_number 1 -codec copy
> > F:\video_data_set\test\%d_4k_compressed.ts
> >
> > 2) ffmpeg -hide_banner -i F:\video_data_set\test\1_4k_compressed.mp4
> > -c:a aac -ar 44100 -b:a 128k -c:v libx264 -x264opts
> nal-hrd=cbr:force-cfr=1
> > -pix_fmt yuv420p -profile:v baseline -level 3.0 -vf
> > "scale=1280:-2,setdar=16:9" -b:v 3.9M -minrate 3.9M -maxrate 3.9M
> -bufsize
> > 7.8M -preset ultrafast -crf 18 -r 30 -g 30 -threads 8 -copyts
> > F:\video_data_set\test\1_4k_compressed_1.ts
> >
> > 3) ffmpeg -hide_banner -f concat -safe 0 -i
> > F:\video_data_set\test\files_2.txt
> > -c copy -threads 8 F:\video_data_set\4k_compressed_1.mp4
> >
> > On Thu, Mar 29, 2018 at 3:00 AM, Faraz Ahmed <faraz.ahmed at purelogics.net
> >
> > wrote:
> >
> >>  Hi,
> >>
> >> We want to encode large video files faster.
> >> To make encoding faster we are using multiple encoding servers.
> >> Below is our process of encoding flow
> >>
> >>
> >>    1. First we split the video into small segments using below command
> >>    2. ffmpeg -i F:\video_data_set\4k_compressed.mp4 -f segment
> >>    -segment_time 5 -segment_start_number 1 -codec copy -copyts
> >>    -avoid_negative_ts 1 F:\video_data_set\test\%d_4k_compressed.mp4
> >>    3. Then we divide these segments among multiple encoding servers
> >>    4. Each encoding server re-encode the segment using below command
> >>    5. ffmpeg -hide_banner -i F:\video_data_set\test\1_4k_compressed.mp4
> >>    -c:a aac -ar 44100 -b:a 128k -c:v libx264 -x264opts
> >> nal-hrd=cbr:force-cfr=1
> >>    -pix_fmt yuv420p -profile:v baseline -level 3.0 -vf
> >>    "scale=1280:-2,setdar=16:9" -b:v 3.9M -minrate 3.9M -maxrate 3.9M
> >> -bufsize
> >>    7.8M -preset ultrafast -crf 18 -r 30 -g 30 -threads 8
> >>    F:\video_data_set\test\1_4k_compressed_1.mp4
> >>    6. When all segments have re-encoded then we join them to make single
> >>    file using below command
> >>    7. ffmpeg -hide_banner -f concat -safe 0 -i
> >> F:\video_data_set\test\files_2.txt
> >>    -c copy -threads 8 F:\video_data_set\4k_compressed_1.mp4
> >>
> >>
> >> All is performing well but the issue we are facing is that after each
> >> segment there is click sound in output audio.
> >> For example i have encoded 5 segments having duration 6,6,3,6 and 6
> >> seconds
> >> when i joined them using above mentioned command the output video has
> >> click
> >> sound at 6,12,15 and 21 seconds of video. I am also sharing my output
> >> video
> >> link below.
> >>
> >> https://www.dropbox.com/s/2dugqt944n19s2j/4k_compressed_1.mp4?dl=0
> >>
> >> Can you please help me and let me know what is the cause of this click
> >> sound and how to fix and remove this click sound from output video.
> >>
> >>
> >>
> >> Thanks,
> >> Faraz
> >> _______________________________________________
> >> ffmpeg-user mailing list
> >> ffmpeg-user at ffmpeg.org
> >> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> >>
> >> To unsubscribe, visit link above, or email
> >> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
> >
> >
> >
> Didn't mean to top-post my bad, gmail is particularly annoying when trying
> to avoid that.
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
>