Can't translate ffmpeg command into javacv

[fcinfo]

I can run under command successfuly:
ffmpeg -hwaccel qsv -c:v h264_qsv -rtsp_transport tcp -i rtsp://admin:[email protected] -f flv -vcodec h264_qsv rtmp://193.169.100.222/live/stream1

what to do translate it into javacv ?

[saudet]

If you're facing any issues in particular, please also provide the error message you get! Thanks

[fcinfo]

I'm sorry. I can use FfmpegFrameRecorder.setVideoCodecName(“h264_qsv”) to specify encoder,
I don't know how to set accelerators and decoders for FfmpegFrameGrabber，I use
grabber.setOption(“hwaccel”，“qsv”)；
grabber.setOption(“c:v”，“h264_qsv”)；
but I didn't find the accelerator and decoder used in decoding.

[saudet]

We will need to add calls to avcodec_find_decoder_by_name() along those to avcodec_find_decoder() in FFmpegFrameGrabber, and also add similar fields as with FrameRecorder but to FrameGrabber to be able to specify the names of the codecs.

Please let me know if you are having issues making the modifications and I will help! Thanks

[fcinfo]

It's great.Thanks！
Are there any plans to release the next release?

[saudet]

Are you having any issues making the modifications yourself?

[fcinfo]

The instance of AVCodec can be find by the method AvCodec.avcodec_find_decoder_by_name()，but I don't know how to use this instance,the method grabber.setVideoCodec only need int.

[saudet]

Right, so we need to add setVideoCodecName() and setAudioCodecName() for that.

[fcinfo]

After I modified the code, the decoder do not work correctly:
[NULL @ 0000000041433620] missing picture in access unit with size 1
[NULL @ 0000000041433620] missing picture in access unit with size 2
[NULL @ 0000000041433620] missing picture in access unit with size 3.
Another the encoder(h264_qsv) cannot work too:
[h264_qsv @ 0000000044b225e0] More than one of: { constant qscale, lookahead, VCM } requested, only one of them can be used at a time.
I don't know how to set the three parameters above?

[saudet]

Me neither, someone will need to read documentation, study the code, ask the developers of FFmpeg, etc...

[fcinfo]

grabber.setPixelFormat(avutil.AV_PIX_FMT_YUV420P);
All the colors of video are lost, It's only going to be avutil.AV_PIX_FMT_BGR24.
why?

[saudet]

You'll needto use something that supports that pixel format for display to see the colors.

[fcinfo]

Hi:
I have modified some code to realize the required functions, but the modified code is limited to FFmpeg part, and I am not sure whether it is in accordance with your logic, so I have emailed you the revised code, please check it.
Thanks.

[saudet]

That's great! Could please send a pull request instead? Thank you!
https://github.com/bytedeco/javacv/pulls

[saudet]

Thanks for pull bytedeco/javacv#948!

[saudet]

BTW, if the ffmpeg program is sufficient, with commit 13ffffd it now gets bundled and can be used easily from Java.