download m3u8 link can Preview video but no sound

[takheang303]

i would like to download m3u8 link and Preview at the same time i can see the video but no sound.

Code

ffmpeg -i "http://live.prd.go.th:1935/live/ch1_L.sdp/chunklist_w1249643471.m3u8" -c:v libx264 -af "volume=15dB" output.mp4 -pix_fmt yuv420p -an -f sdl2 -window_size 1280x720 "Preview"

[jagabo]

-an = audio none ?

Tried it. That isn't the problem.

[takheang303]

i tried ffmpeg -i "http://live.prd.go.th:1935/live/ch1_L.sdp/chunklist_w1249643471.m3u8" -c:v libx264 -af "volume=15dB" output.mp4 -pix_fmt yuv420p -f sdl2 -window_size 1280x720 "Preview" but doesn't work

[october262]

i tried ffmpeg -i "http://live.prd.go.th:1935/live/ch1_L.sdp/chunklist_w1249643471.m3u8" -c:v libx264 -af "volume=15dB" output.mp4 -pix_fmt yuv420p -f sdl2 -window_size 1280x720 "Preview" but doesn't work

do you still get audio when the file is downloaded ??

might also try using a transport stream - https://superuser.com/questions/757114/play-ffmpeg-while-downloading

[jagabo]

The ffmpeg command line creates a file called output.mp4 while it's previewing. That file includes audio. The result is the same with a transport stream -- no audio during preview. One benefit of using a transport stream though is that you can play the TS while it's still downloading.

[notaghost]

ffmpeg -i "http://live.prd.go.th:1935/live/ch1_L.sdp/chunklist_w1249643471.m3u8" -c copy output.ts

you can watch ts file while it is being downloaded.

[jagabo]

You can download the m3u8 with ffmpeg and preview the video (and audio) with ffplay:

ffmpeg -y -i "http://live.prd.go.th:1935/live/ch1_L.sdp/chunklist_w1249643471.m3u8" -c:v libx264 -af "volume=15dB" output.mp4 -c copy -f mpegts - | ffplay -x 1280 -y 720 -

Note that the preview is of the incoming stream, not the reencoded mp4.

[takheang303]

Thank you jagabo it works well