[Request] Specify input format explicitly

[helldog136]

Hi,

Is there a way to specify the input format (ie write the "-f" option) for the plugin? I'm working with an mjpeg video flux that is not correctly recognized and i just need to specify this option.

Thanks Helldog136

[helldog136]

Found it. You should be able to specify the input format in the options and then this should be set in FFMPEGMediaPlayer.cpp at line 306 according to documentation: https://ffmpeg.org/doxygen/2.8/group__lavf__decoding.html#ga10a404346c646e4ab58f4ed798baca32

[bakjos]

The problem with this is that I’m using the Unreal base player and you can only set the options globally and it would apply to all the instances of the FFMPEGPlayer, so it’s posible to add the options but you’ll have to do it using an actor component. The primary target for this plugin is to use it as replacement for the default player when you need more codecs or support for transparent videos

[helldog136]

I understand the goal of this plugin. Can you maybe point a solution? I've been struggling with this for ages... I'm not familiar with coding plugins for UE. Could you show me how i can hotfix your plugin so it takes only mjpeg streams using the mjpeg demux?

[bakjos]

I guess the easiest way is to specify the format_whitelist or the codec_whitelist, I don't have any video encoded with mjpeg, to test. So you can modify the FFMPEGMediaPlayer class and add something like

FFMPEGMediaPlayer.cpp:298

//this is the demuxer you can see the available formats using ffmpeg -formats av_dict_set(&format_opts, "format_whitelist", "...", AV_DICT_DONT_OVERWRITE);

//this is the demuxer you can see the available formats using ffmpeg -codecs ... av_dict_set(&format_opts, "codec_whitelist", "...", AV_DICT_DONT_OVERWRITE);

or you can specify directly the codec inside de FFMPEGMediaTracks.cpp:1515 FindDecoders(AV_CODEC_ID_MJPEG...)

avcodec_find_decoder(AV_CODEC_ID_MJPEG...)