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avcodec/encode: only allow undersized audio frames if they are the last

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Otherwise the user might get a silence padded frame in the beginning or in the
middle of the encoding.

Some other bug uncovered this:

./ffmpeg -loglevel verbose -y -f data -i /dev/zero \
-filter_complex "nullsrc=s=60x60:d=10[v0];sine=d=10[a]" \
-map '[v0]' -c✌️0 rawvideo \
-map '[a]'  -c🅰️0 mp2 \
-f mpegts out.ts

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2019-08-03 21:44:28 +02:00
parent da8936969f
commit 686755f02b
1 changed files with 8 additions and 2 deletions
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10
libavcodec/encode.c
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@ -174,8 +174,14 @@ int attribute_align_arg avcodec_encode_audio2(AVCodecContext *avctx,
goto end;
}
} else if (!(avctx->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE)) {
if (frame->nb_samples < avctx->frame_size &&
!avctx->internal->last_audio_frame) {
/* if we already got an undersized frame, that must have been the last */
if (avctx->internal->last_audio_frame) {
av_log(avctx, AV_LOG_ERROR, "frame_size (%d) was not respected for a non-last frame (avcodec_encode_audio2)\n", avctx->frame_size);
ret = AVERROR(EINVAL);
goto end;
}
if (frame->nb_samples < avctx->frame_size) {
ret = pad_last_frame(avctx, &padded_frame, frame);
if (ret < 0)
goto end;