Feature request: Stream video to stdout

[acheong08]

Similar to ffmpeg -i mp4 somefile.mp4 -. This would make integrating it a bit easier in some cases (e.g. streaming to pyatv)

[soreau]

See this issue.

[soreau]

Also, this is another way:

wf-recorder -o DP-2 -f pipe:99 -m matroska -c libx264 99>&1 >&2 | mpv -

You probably will need to change the output name (-o option) or omit it in the case of single output.

[acheong08]

Hmm the format doesn't seem to be accepted. Is there a way I can pass this into ffmpeg & output as mp4?

[acheong08]

Ok I found the reason:
wf-recorder -f pipe:1 -m matroska -c libx264 > out.mpv

acheong@fish ~/P/airplay [255|183]> head out.mpv
selected region 0,0 0x0
Setting codec option: crf=20
Setting codec option: preset=ultrafast
Setting codec option: tune=zerolatency
Using video filter: null
MSIfSMSTkSSTSpbIfk*ױ[email protected]?
|ƕ#[email protected]ׁsň5K"undV_MPEG4/ISO/AVCкUUc>g>#x@!PhT!sscgȚEENCODERDLavf60.16.100Cu+[w+]Y,x264 - core 164 r3108 31e19f9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2023 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=6 threads=8 lookahead_threads=8 sliced_threads=1 slices=8 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=20.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0{/e:$Pmy<O'Yoo͟oe?r'<OwGT0>;hi#9-ix2]13.g|QdcLq(S9L@\N֘I2$[/e;&_g>#:z7}y3>?<azցkX0nm #"T~

I'm a bit confused by the pipes & how to remove the logs/info

Edit:

wf-recorder -m rawvideo -f /dev/stdout <<< 'Y' 2>/dev/null | ffmpeg -i pipe:0 -c:v libx264 -preset fast -crf 23 -f 
mp4 out.mp4

[in#0 @ 0x564514ef0280] Error opening input: Invalid data found when processing input
Error opening input file pipe:0.
Error opening input files: Invalid data found when processing input

I'm guessing because taking from pipe0 includes the logs

Edit 2:
Copying verbatim:

$ wf-recorder -f pipe:99 -m matroska -c libx264 99>&1 >&2 > out.mpv

$ cat out.mpv 
selected region 0,0 0x0
Setting codec option: crf=20
Setting codec option: preset=ultrafast
Setting codec option: tune=zerolatency
Using video filter: null

The rest of the output goes to the terminal...

[soreau]

Make sure you're using latest wf-recorder with this commit.

[acheong08]

Thanks! I got it working :)