CODEWITHSUNDEEP
cffmpegh.264
parthlr
parthlr

Reputation: 426

FFmpeg - H264 encoder could not find a valid device and can't configure encoder

I am trying to encode using the H264 encoder, but when I do, I get the following error:

[h264_v4l2m2m @ 0x55682d2416c0] Could not find a valid device
[h264_v4l2m2m @ 0x55682d2416c0] can't configure encoder

I made sure that I enabled the encoder when I configured FFmpeg. When I run the command ffmpeg -codecs I see that the H264 codec is listed as an encoder:

DEV.LS h264    H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
(decoders: h264 h264_v4l2m2m )
(encoders: libx264 libx264rgb h264_v4l2m2m h264_vaapi )

The source video's video codec is H264 so I am not sure why I am not able to encode with H264 when there is both a decoder and encoder for it. Even when I run avcodec_find_encoder_by_name to find the libx264 encoder, it isn't able to.

This is the chunk of code where it fails:

codec = avcodec_find_encoder(AV_CODEC_ID_H264);
if (!codec) {
    printf("[ERROR] Failed to find video output codec\n");
    return -1;
}
outputCodecContext = avcodec_alloc_context3(codec);
if (!outputCodecContext) {
    printf("[ERROR] Failed to allocate memory for video output codec context\n");
    return -1;
}
av_opt_set(outputCodecContext->priv_data, "preset", "slow", 0);
outputCodecContext->bit_rate = inputCodecContext->bit_rate;
outputCodecContext->width = inputCodecContext->width;
outputCodecContext->height = inputCodecContext->height;
outputCodecContext->time_base = (AVRational){1, 60};
outputCodecContext->framerate = (AVRational){60, 1};
outputCodecContext->pix_fmt = inputCodecContext->pix_fmt;
outputCodecContext->extradata = inputCodecContext->extradata;
outputCodecContext->extradata_size = inputCodecContext->extradata_size;

// This if statement fails as a result of the encoder error
if (avcodec_open2(outputCodecContext, codec, NULL) < 0) {
    printf("[ERROR] Failed to open video output codec\n");
    return -1;
}
return 0;

When I encode with H264 using the ffmpeg command, I don't receive any of these errors. Any help is appreciated.

Upvotes: 7

Views: 11494

Answers (1)

parthlr
parthlr

Reputation: 426

As it turns out, I kept forgetting to call make and make install (I'm on Ubuntu) after I used the command ./configure --enable-shared --enable-libx264 --enable-gpl. This removed the error I was receiving and my code was able to find the libx264 encoder.

Upvotes: 6

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