webmmux byte offset

[F Weers]

Hi all,

summary: I have a pipeline that writes any video (with audio) to webm
format (in which every frame is a keyframe), I want to know the byteoffsets
of the (key-)frames of the written file.

First of all, thanks for the awesome Rust support of GStreamer. I'm quite
new to Rust, but it feels very natural to convert a console-command to the
Rust equivalent!
I have the following (simplified) pipeline:

gst-launch-1.0 webmmux name=mux ! filesink location="output.webm"
filesrc location="input.mp4" ! decodebin name=demux \
demux. ! videoconvert ! videoscale ! videorate ! vp9enc !  mux.video_0 \
demux. ! audioconvert ! audioresample ! opusenc ! mux.audio_0


It converts an mp4 file to a webm file (I started with this ffmpeg command:
'ffmpeg -i input.mp4 -c:v libvpx-vp9 -crf 30 -g 1 -b:v 0 -b:a 128k -c:a
libopus output.webm'). This works great. In my code, I also set the
keyframe-max-dist to 1, which means that every frame is a keyframe (the '-g
1' argument in the ffmpeg command). Now, I'd like to get the byte offsets
of the key-frames, so I can directly load the segments from disk. While I
can get those offsets using https://github.com/acolwell/mse-tools , I'd
like to get them directly while converting an input video to its webm
version with only keyframes.

Thank you in advance! Let me know if something is unclear.

Sincerely,
Floris Weers
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